2,167 results on '"CNTs"'
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2. Identify the impact of pyrolysis temperature on preparation of carbon nanotubes by catalytic reforming polypropylene.
- Author
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Cai, Ning, Liu, Qingyu, Li, Xiaoqiang, Li, Shujiang, Yang, Haiping, and Chen, Hanping
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CATALYTIC reforming , *ALUMINUM oxide , *PLASTIC scrap , *PLASTICS , *AROMATIC compounds - Abstract
• The catalytic reforming can efficiently convert waste plastics to CNTs. • The pyrolysis temperature significantly affects the volatilization composition. • Lower temperature promotes the formation of C 3 H 6 , C 2 H 6 and wax. • Higher temperature facilitates the generation of aromatic hydrocarbons. • Wax and small molecule hydrocarbons accelerate the growth of CNTs. Catalytic reforming offers a promising method for converting waste plastics into valuable products such as carbon nanotubes (CNTs). The composition of the carbon source plays a crucial role in determining the growth of CNTs because pyrolysis temperature exerts a significant influence on volatilisation. This study investigated the impact of pyrolysis temperature on the formation of CNTs in the presence of an Fe/Al 2 O 3 catalyst. A pyrolysis temperature of 500 ℃, generated a liquid product containing a high concentration of long-chain waxy hydrocarbons, while the gaseous products were dominated by C 3 H 6 (47 vol%) and C 2 H 6 (20 vol%). Increasing the pyrolysis temperature facilitated the formation of CH 4 and aromatic hydrocarbons at the expense of the waxy components. Following catalysis, carbon deposits of > 30 wt% (comprising approximately 80 % CNTs) were obtained at 500 ℃, compared to 20 wt% (with CNTs comprising 60 %) at 900 ℃. In summary, the results suggest that small molecular hydrocarbons, including C 3 H 6 and waxy components, promote CNT formation, whereas aromatic hydrocarbons contribute to the formation of amorphous carbon or coke. [ABSTRACT FROM AUTHOR]
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- 2024
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3. Effects of steel fibers and carbon nanotubes on the flexural behavior of hybrid GFRP/steel reinforced concrete beams.
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Salman, Amany, Hassan, Ahmed, and Ahmed, H. I.
- Abstract
Background: Glass fiber-reinforced polymer (GFRP) bars offer a superior alternative to steel bars in concrete reinforcement but are associated with wider cracks and higher deformation rates. This study introduces a novel approach by combining steel fibers (SFs) and carbon nanotubes (CNTs) to address these drawbacks and enhance the performance of GFRP-reinforced concrete beams. The unique contribution of this study lies in the simultaneous use of SFs and CNTs, which has not been extensively investigated, particularly in the context of GFRP-reinforced concrete. The study involved testing three sets of nine specimens with different concrete mixtures and reinforcement forms. Results: The results showed that adding 0.04% CNTs by cement weight and 0.6% SFs by volume fraction significantly improved the mechanical performance of GFRP and steel reinforced beams. GFRP reinforced beams with CNTs and SFs exhibited a reduction in crack width, a 20% increase in load-carrying capacity, and a 25% reduction in deflection compared to reference specimens. Scanning electron microscope analysis further revealed that CNTs effectively enhanced tensile load transfer, improving flexural behavior of the beams. The finite element analysis using ANSYS confirmed the experimental findings, highlighting the improved stress distribution in the modified concrete mixtures. Conclusions: Incorporating SFs and CNTs in concrete significantly improves the mechanical performance of GFRP-reinforced beams, making them more durable and resilient. These findings suggest that the proposed approach can enhance the longevity and sustainability of concrete structures, particularly in dynamic load applications such as bridges and high-rise buildings. Further experimental and analytical studies are recommended to assess the practical implications and cost-effectiveness of these materials in large-scale construction projects. [ABSTRACT FROM AUTHOR]
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- 2024
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4. Effect of ZIF-67-derived Co3O4 on the activity of CNTs/ NiCo2O4 nanocomposite for methanol oxidation reaction.
- Author
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Mamdouh, Nahla, Farghali, Ahmed A., El Rouby, Waleed M.A., and Abdelwahab, Abdalla
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DIRECT methanol fuel cells , *TRANSITION metal oxides , *METHANOL as fuel , *CARBON nanotubes , *FUEL cells , *ELECTROLYTIC oxidation - Abstract
The development of a hybrid electrocatalyst with multi-active sites that enhances the efficiency of the anodic reaction in the direct methanol fuel cells (DMFCs), is an important topic. Zeolite imidazole frameworks (ZIFs) and transition metal oxides exhibit promising performance in this regard. Herein, novel nanocomposites of nickel cobaltite (NiCo 2 O 4), carbon nanotubes (CNTs), and ZIF-67-derived Co 3 O 4 rhombic dodecahedron nanoparticles were prepared using the hydrothermal process followed by the pyrolysis method. The electro-catalytic activity and stability of the prepared electrodes toward methanol electro-oxidation were investigated in basic medium. The results show that ZIF-67/CNTs/NiCo 2 O 4 /NF is the most promising nanocomposite for methanol electro-oxidation with a delivered catalytic current density of 160 mA cm−2 at a scan rate of 40 mV‧s−1. The synergistic effect of combining CNTs with NiCo 2 O 4 and ZIF-67 is the reason for the highly electro-catalytic activity of ZIF-67/CNT/NiCo 2 O 4 /NF. This new structure and composition introduce a promising avenue for the development of electrocatalysts for methanol electro-oxidation. [Display omitted] • Novel nanocomposites of nickel cobaltite, CNTs, and ZIF-67-derived Co 3 O 4 were prepared. • The electro-catalytic activity towards methanol electro-oxidation was investigated. • ZIF-67/CNT/NiCo 2 O 4 /NF shows a current density of 160 mA cm−2 at a scan rate of 40 mV‧s−1. • A synergistic effect is the reason for the high catalytic activity of ZIF-67/CNT/NiCo 2 O 4 /NF. [ABSTRACT FROM AUTHOR]
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- 2024
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5. Designing In2S3/FeVO4/CNT Photoelectrode for Enhanced Visible Light Driven Oxygen Evolution.
- Author
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Garg, Nitika and Ganguli, Ashok K.
- Abstract
The development of efficient and stable photoelectrodes is essential for the advancement of photoelectrochemical (PEC) water‐splitting technologies, which hold promise for efficient oxygen evolution reaction (OER), necessary for sustainable hydrogen production. In this study, the synthesis of a ternary composite, In 2 ${_2 }$ S 3 ${_3 }$ /FeVO 4 ${_4 }$ /CNT has been reported, designed for highly efficient PEC oxygen evolution. The formation of In 2 ${_2 }$ S 3 ${_3 }$ /FeVO 4 ${_4 }$ heterostructure enhances PEC performance significantly due to the type‐II band alignment, which minimizes electron‐hole recombination and improves charge separation. The addition of CNTs further enhances performance by providing conductive pathways that improve electron transport and reduce charge transfer resistance. The resulting In 2 ${_2 }$ S 3 ${_3 }$ /FeVO 4 ${_4 }$ /CNT ternary composite achieves a current density of 14.70 mAcm -2 ${^{ - 2} }$ at 1.8 V vs. RHE, representing a notable increase in performance. Electrochemical impedance spectroscopy (EIS) shows that the ternary composite has the lowest charge transfer resistance, while Bode phase analysis indicates a longer carrier lifetime, emphasizing the synergistic effect of heterostructure formation and CNT inclusion. The ternary composite also demonstrates excellent stability and responsiveness during transient photocurrent cycling, maintaining performance under repeated chronoamperometric ON/OFF cycles, making it a strong candidate for water‐splitting applications driven by visible light. [ABSTRACT FROM AUTHOR]
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- 2024
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6. The Effect of Carbon Nanotubes on the Viscosity and Surface Tension of Heat Transfer Fluids—A Review Paper.
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Khoswan, Ibrahim, Abusafa, Abdelrahim, and Odeh, Saad
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HEAT transfer fluids , *CARBON nanotubes , *NANOFLUIDS , *INTERMOLECULAR interactions , *HEAT transfer , *SURFACE tension - Abstract
The connection between surface tension and viscosity has been the subject of several pieces of research on nanofluids. Researchers have discovered differing relationships between these two suspension qualities in the literature. Surface tension and viscosity have been found to be correlated in certain research works but not in other. The behavior of these fluids may be influenced by several factors, including temperature, the presence of surfactants, and the functional groups on carbon nanotubes (CNTs). This study investigates the relationship between surface tension and viscosity in CNT-Nanofluids by reviewing earlier research on the impact of CNT addition on water's intermolecular interactions. The findings show that depending on different aspects of the nanofluids, the connection is complicated and uncertain. The study shows that although temperature and the addition of carbon nanotubes affect both surface tension and viscosity, other studies only consider how these factors affect one of these qualities. We conclude that under certain heat transfer circumstances, there is no clear-cut relationship between surface tension and viscosity in CNT–water fluids. [ABSTRACT FROM AUTHOR]
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- 2024
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7. Simulation and characterization of Co3O4/carbon nanotube-filled PVC nanocomposites for medium-voltage cable applications.
- Author
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Alkhursani, Sheikha A., Aldaleeli, N., Elbasiony, A. M., Ghobashy, Mohamed Mohamady, Madani, Mohamed, Al-Gahtany, Samera Ali, Zaher, Ahmed, and Sharshir, A. I.
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FULLERENES , *DIELECTRIC loss , *ELECTRIC fields , *PERMITTIVITY , *POLYVINYL chloride - Abstract
This study investigates the simulation of electric field distribution and the characterization of Co3O4/carbon nanotube (CNT)-filled polyvinyl chloride (PVC) nanocomposites for potential applications in medium-voltage cables. The nanocomposites were prepared by incorporating Co3O4 nanoparticles and varying concentrations of CNTs (0, 0.1, 0.15, 0.20, and 0.25% by weight) into a PVC matrix. The UV–Vis spectroscopy revealed an absorption edge of 3.75 eV, a direct bandgap of 5.15 eV, an Urbach tail energy of 0.4594 eV, and a carbon cluster parameter of 44.617 for the PVC/Co3O4 + 0.25% CNT nanocomposite film. Incorporating CNTs enhanced the AC conductivity, dielectric constant, and dielectric loss compared to the pure Co3O4 sample. The highest AC conductivity (7.46 × 10–4 S/m) was achieved for the PVC/Co3O4 + 0.25% CNT nanocomposite. COMSOL Multiphysics simulations were performed to study the electric field distribution in medium-voltage cables made of PVC and PVC/Co3O4 + 0.25% CNT nanocomposites. The simulations revealed a more uniform electric field distribution in the nanocomposite cable than the pure PVC cable, owing to Co3O4 nanoparticles and CNTs. The novelty of this study is improved uniformity in the electric field distribution for medium-voltage cable applications. [ABSTRACT FROM AUTHOR]
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- 2024
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8. Improved thermoelectric properties of SrTiO3-based ceramic/CNTs composite synthesized via high-temperature and high-pressure method.
- Author
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Gao, Shan, Yu, Haidong, Yang, Peng, Zhang, Yuewen, Ma, Hongan, and Jia, Xiaopeng
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ELECTRIC conductivity , *CARRIER density , *ELECTRON mobility , *COMPOSITE materials , *THERMOELECTRICITY - Abstract
Composites consisting of two nano-or molecular-scale components tend to exhibit newer properties or characterizations compared to the matrix material. However, they are extremely limited in thermoelectricity due to the difficulty of achieving an extremely homogeneous distribution of the material on such a small scale. In this paper, we successfully prepared a series of composite thermoelectric materials of Sr 0.9 La 0.1 Ti 0.85 Nb 0.15 O 3 /carbon nanotubes (CNTs, with contents of 0.5, 1.5, 2.5, and 5.0 wt%). Highly homogeneous dispersion of CNTs was observed in the strontium titanate oxide (SrTiO 3) matrix prepared via high-temperature and high-pressure (HPHT) synthesis due to the interaction between SrTiO 3 and multi-walled CNTs. The experimental results showed that CNTs were uniformly dispersed in the composite powders synthesized using the HPHT method. Meanwhile, the electrical conductivity increased linearly with the increase in the CNTs content. The power factor reached 684 μWm−1K−2 at 973K with 2.5 wt% CNTs composite concentration. This considerable enhancement is attributed to the increase in the charge carrier concentration as well as the higher electron mobility. In addition, the lattice thermal conductivity was suppressed due to enhanced Umklapp scattering. This ultimately leads to a thermoelectric figure of merit, zT , of 0.33 at 973 K. This work opens a new window on the thermoelectric properties of nanocomposite SrTiO 3 -based thermoelectric materials. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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9. Azadirachta indica Mediated Functionalization of MWCNTs by Ferrites of Nickel and Cobalt for the Remediation of As(III) Ions.
- Author
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Sattar, Abdul, Hussain, Shahzad, Bibi, Fozia, Arif, Saira, Khan, Rafaqat Ali, and Waseem, Muhammad
- Abstract
Removal of arsenic from drinking water is challenging and the most significant global concern. In this study, multi-walled carbon nanotubes (MWCNTs) after surface functionalization with nickel ferrite (MWCNTs/NFO) and cobalt ferrite (MWCNTs/CFO) were used as adsorbents for As(III) ions. The functionalization was carried out by hydrothermal method using Azadirachta indica (neem) extract as a green source. The morphology, thermal stability, structure and magnetic behavior of adsorbents were characterized using FTIR, XRD, TGA, TEM and VSM. For investigation of the sorption behavior of As(III), batch tests were performed under the effect of pH, time, concentration, temperature and dose. Kinetics study suggests that the pseudo 2nd order model fits well, while the Langmuir model confirms the sorption data. Thermodynamic and desorption studies exhibited that the governing mechanism is chemisorption. The conducted work revealed that MWCNTs/NFO labeled as CN1 served as the best candidate due to high removal efficiency of about 96% for As(III). [ABSTRACT FROM AUTHOR]
- Published
- 2024
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10. Production and Characterization of Hybrid Al6061 Nanocomposites.
- Author
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Monteiro, Beatriz and Simões, Sónia
- Subjects
HYBRID materials ,TENSILE tests ,NANOPARTICLES ,GRAIN refinement ,POWDER metallurgy - Abstract
Aluminum-based hybrid nanocomposites, namely the Al6061 alloy, have gained prominence in the scientific community due to their unique properties, such as high strength, low density, and good corrosion resistance. The production of these nanocomposites involves incorporating reinforcing nanoparticles into the matrix to improve its mechanical and thermal properties. The Al6061 hybrid nanocomposites were manufactured by conventional powder metallurgy (cold pressing and sintering). Ceramic silicon carbide (SiC) nanoparticles and carbon nanotubes (CNTs) were used as reinforcements. The nanocomposites were produced using different reinforcement amounts (0.50, 0.75, 1.00, and 1.50 wt.%) and sintered from 540 to 620 °C for 120 min. The characterization of the Al6061 hybrid nanocomposites involved the analysis of their mechanical properties, such as hardness and tensile strength, as well as their micro- and nanometric structures. Techniques such as optical microscopy (OM) and scanning electron microscopy (SEM) with electron backscatter diffraction (EBSD) were used to study the distribution of nanoparticles, the grain size of the microstructure, and the presence of defects in the matrix. The microstructural evaluation revealed significant grain refinement and greater homogeneity in the hybrid nanocomposites reinforced with 0.75 wt.% of SiC and CNTs, resulting in better mechanical performance. Tensile tests showed that the Al6061/CNT/SiC hybrid composite had the highest tensile strength of 104 MPa, compared to 63 MPa for the unreinforced Al6061 matrix. The results showed that adding 0.75% SiC nanoparticles and CNTs can significantly improve the properties of Al6061 (65% in the tensile strength). However, some nanoparticle agglomeration remains one of the challenges in manufacturing these nanocomposites; therefore, the expected increase in mechanical properties is not observed. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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11. Designing NiCoS/CNTs composites for highly efficient bifunctional electrocatalyst in water splitting.
- Author
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Yousaf, Sheraz, Abdou, Safaa N., Rasheed, Tabinda, Ibrahim, Mohamed M., Shakir, Imran, El-Bahy, Salah M., Ahmad, Iqbal, Shahid, Muhammad, and Warsi, Muhammad Farooq
- Abstract
Electrocatalytic water-splitting holds great promise for the large-scale production of hydrogen as a renewable and environmentally friendly alternative to fossil fuels. However, the exploration of a cost-effective, stable, and active bifunctional electrocatalyst remains a significant challenge in achieving efficient hydrogen (H
2 )/oxygen (O2 ) production through water electrolysis. Herein, we used nickel-doped cobalt sulfide (NiCoS) supported by carbon nanotubes (CNTs) as a promising candidate for electrocatalytic water splitting. The Ni-Co-based catalyst comprising the redox couples of Ni+3 /Ni+2 and Co+3 /Co+2 exhibits remarkable efficiency as active sites for both HER as well as OER. The linear sweep voltammetry (LSV) results indicate that the fabricated bifunctional catalyst necessitates overpotentials of just 327 mV for achieving a cathodic current density of 100 mAcm−2 and 344 mV for the anodic current density of the same value. Additionally, the Tafel slopes for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are 64 mVdec−1 and 70 mVdec−1 , respectively. The electrochemical impedance analysis (EIS) was also performed which revealed that NiCoS/CNTs has the lowest charge transfer resistance (Rct ) which is 1.94 Ω as compared to the CoS (7.52 Ω) and NiCoS (4.74Ω). The ECSA value of the prepared NiCoS/CNTs material was observed as 3.47 cm2 . Such an excellent synergetic effect is due to the interaction of NiCoS with CNTs, which not only provides highly active sites available for faster charge transfer but also increases the electrical conductivity of the fabricated material. This study offers valuable insights into the design of the best electrocatalysts for water splitting. [ABSTRACT FROM AUTHOR]- Published
- 2024
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12. In Situ Catalyzed Growth of Carbon Nanotube with Asphalt Cladding as a Bicarbon Synergistic Framework of Silicon Anodes for Lithium‐ion Batteries.
- Author
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Liu, Yiming, Duan, Jianzheng, Chen, Pengfei, Li, Peihua, Zhang, Wanggang, Li, Xiaohong, and Wang, Jian
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COMPOSITE materials , *FERRIC chloride , *ANODES , *ASPHALT , *CARBONIZATION - Abstract
Silicon, as the most promising advanced anode material for lithium‐ion batteries, faces challenges in large‐scale industrial production due to the significant volume expansion effect. In this investigation, Si/CNTs/C composite materials were effectively produced through high‐temperature carbonization utilizing asphalt, silicon, hexahydrate ferric chloride, and melamine as primary elements. The distinctive dual‐carbon framework of asphalt‐derived carbon and carbon nanotubes alleviates the volume expansion of silicon, thereby stabilizing the composite material's structure. Testing the electrochemical performance reveals that the Si/CNTs/C composite material exhibits a reversible specific capacity of 1187 mAh g−1 with a capacity retention rate of 92.6 % after 150 cycles at a current density of 0.2 A g−1. Even after 500 cycles at a current density of 1 A g−1, it sustains a specific capacity of 879.4 mAh g−1 with a capacity retention rate of 87.9 %, showcasing outstanding electrochemical performance. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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13. Ultra-small Ru0-loaded carbon nanotubes for highly efficient electrocatalytic H2 production over a wide pH range.
- Author
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Li, Xiang, Zhao, Zhan, Huang, Kelei, Meng, Xiangchao, and Li, Zizhen
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HYDROGEN evolution reactions , *HEAT treatment , *STRAINS & stresses (Mechanics) , *PROCESS heating , *ELECTROCATALYSTS , *CARBON nanotubes - Abstract
The design of highly efficient catalysts applied in a wide pH range for hydrogen evolution reaction (HER) is still very challengeable. Herein, a rapid Joule heating method has been applied to deposit Ru nanoparticles onto carbon nanotubes (Ru/CNTs). Owing to the rapid heating and cooling processes during the Joule heating treatment, the lattice was disordered with exposure of massive reactive sites for HER. As tested, Ru/CNTs showed outstanding activity in HER in a wide pH range. It only required an overpotential of 21 mV and 9 mV at 10 mA cm−2 for HER in 0.5 M H 2 SO 4 and 1 M KOH, specifically. The overpotential required to achieve a current density of 1 A cm−2 in 0.5 M H 2 SO 4 and 1 M KOH was 162 mV and 360 mV, respectively. The excellent performance of Ru/CNTs was comparable to commercial Pt/C catalyst. Furthermore, using the manufactured Ru/CNTs, a homemade anion-exchange membrane AEM electrolyzer was assembled. It only required 1.87 V to reach 100 mA cm−2 with nearly 100% Faraday efficiency. This work provided a novel method to prepare Ru nanoparticles onto carbon nanotubes by a rapid Joule heating treatment for advanced HER activity in a wide pH range. [Display omitted] • As-Prepared electrocatalysts exhibited excellent HER activity in a wide pH range. • Structural deformation and lattice strain were constructed by rapid Joule heating. • Ru0 formed by rapid Joule heating inhibited the oxidation of Ru. [ABSTRACT FROM AUTHOR]
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- 2024
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14. Honeycomb Cell Structures Formed in Drop-Casting CNT Films for Highly Efficient Solar Absorber Applications †.
- Author
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Islam, Saiful and Furuta, Hiroshi
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HONEYCOMB structures , *REFLECTANCE , *HYDRONICS , *SOLAR radiation , *WATER purification - Abstract
This study investigates the process of using multi-walled carbon nanotube (MWCNT) coatings to enhance lamp heating temperatures for solar thermal absorption applications. The primary focus is studying the effects of the self-organized honeycomb structures of CNTs formed on silicon substrates on different cell area ratios (CARs). The drop-casting process was used to develop honeycomb-structured MWCNT-coated absorbers with varying CAR values ranging from ~60% to 17%. The optical properties were investigated within the visible (400–800 nm) and near-infrared (934–1651 nm) wavelength ranges. Although fully coated MWCNT absorbers showed the lowest reflectance, honeycomb structures with a ~17% CAR achieved high-temperature absorption. These structures maintained 8.4% reflectance at 550 nm, but their infrared reflection dramatically increased to 80.5% at 1321 nm. The solar thermal performance was assessed throughout a range of irradiance intensities, from 0.04 W/cm2 to 0.39 W/cm2. The honeycomb structure with a ~17% CAR value consistently performed better than the other structures by reaching the highest absorption temperatures (ranging from 52.5 °C to 285.5 °C) across all measured intensities. A direct correlation was observed between the reflection ratio (visible: 550 nm/infrared: 1321 nm) and the temperature absorption efficiency, where lower reflection ratios were associated with higher temperature absorption. This study highlights the significant potential for the large-scale production of cost-effective solar thermal absorbers through the application of optimized honeycomb-structured absorbers coated with MWCNTs. These contributions enhance solar energy efficiency for applications in water heating and purification, thereby promoting sustainable development. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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15. The improved viscoelastic properties of long‐length carbon nanotubes reinforced polyamide‐6 composites.
- Author
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Tripathy, Sangita, Chauhan, Gaurav Singh, Jyoti, Jeevan, Dhakate, S. R., and Singh, Bhanu Pratap
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GLASS transition temperature , *DYNAMIC mechanical analysis , *RAMAN spectroscopy , *X-ray diffraction , *ABRASION resistance , *CARBON nanotubes - Abstract
Highlights The semi‐crystallinity, thermoplasticity, high toughness, and light weight of polyamide‐6 (PA6) when reinforced with carbon nanotubes (CNTs) provide outstanding physical properties to the nanocomposites by combining the physical properties of both components. The processing difficulties arising due to the high toughness and abrasion resistance of PA6 and the agglomeration of in‐house synthesized long‐length CNTs can be tackled by melt‐mixing the components inside a twin‐screw extruder with a back‐flow channel. The 0.1–7 parts per hundred ratios (phr) of CNTs reinforced PA6 composites were characterized for their viscoelastic properties through oscillatory rheometry and dynamic mechanical analysis (DMA) at fixed operating conditions. The outcomes showed continuous shiftings in storage and loss modulus values with increasing reinforcements along with a viscoelastic transition at 3 phr CNTs reinforcements observed in DMA. A 19°C rise in glass transition temperature (Tg) was observed in DMA with 0.1 phr CNTs reinforcement, which showed further improvements with increasing CNTs content. The interactions among PA6 and CNTs were further confirmed by X‐ray diffraction (XRD) and Raman spectroscopy curves. These nanocomposites promise mechanical applications in the equipments of automobiles, aerospace, defense, biomedical, bio‐sensors, etc. Viscoelastic properties study for CNTs/PA6 composites Uniform intermixing of CNTs within PA6 via extrusion with back‐flow channel Detailed analysis of rheometry and DMA of the composites CNTs‐PA6 interactions estimated from rising intensity peaks in Raman spectra and X‐ray diffraction (XRD) Potential candidates for components in automobiles, aircraft, biomedicals, and sports industry [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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16. Nanocluster-Based Computational Creation of a Potential Carrier for Chemotherapeutic Antibacterial Drugs.
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Issa, Ali A., Alkhafaji, Alyaa A., Abdulwahid, Farah S., Al-Obaidy, Rusul A., Kamel, Maryam D., Haider, Adawiya J., and Al-Shaham, Ali A.
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ELECTRONIC band structure , *MOLECULAR docking , *FOLIC acid , *SURFACE interactions , *DYNAMIC simulation - Abstract
Elaboration of the adsorption behavior of antibacterial drugs, Folic acid, and Paclitaxel2, on nanomaterials was studied to understand the electronic and structure properties for computationally chemotherapeutic antibacterial advances. The designed nanoclusters were optimized based on DFT considering the dispersion correction D-DFT parameter in this study. The electronic band structure and total density of state (TDOS) for the current nanomaterials, carbon nano tube (CNT) and maghemite (γ-Fe2O3), were estimated for best electronic description. Dynamic simulation analysis of the designed adsorption systems was performed and the adsorption annealing locator using Monte Carlos simulation was proceeded to estimate the surface interactions and close contacts between the antibacterial drugs and nanostructures. Molecular docking analysis was thought to be important in this study to investigate the binding affinity of the chemotherapeutic carriers inside the bacterial cells. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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17. Enhancing Electrochemical Performance of Si@CNT Anode by Integrating SrTiO 3 Material for High-Capacity Lithium-Ion Batteries.
- Author
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Oli, Nischal, Liza Castillo, Diana C., Weiner, Brad R., Morell, Gerardo, and Katiyar, Ram S.
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STRAINS & stresses (Mechanics) , *ENERGY storage , *IMPEDANCE spectroscopy , *LITHIUM-ion batteries , *ENERGY consumption , *ELECTRIC batteries - Abstract
Silicon (Si) has attracted worldwide attention for its ultrahigh theoretical storage capacity (4200 mA h g−1), low mass density (2.33 g cm−3), low operating potential (0.4 V vs. Li/Li+), abundant reserves, environmentally benign nature, and low cost. It is a promising high-energy-density anode material for next-generation lithium-ion batteries (LIBs), offering a replacement for graphite anodes owing to the escalating energy demands in booming automobile and energy storage applications. Unfortunately, the commercialization of silicon anodes is stringently hindered by large volume expansion during lithiation–delithiation, the unstable and detrimental growth of electrode/electrolyte interface layers, sluggish Li-ion diffusion, poor rate performance, and inherently low ion/electron conductivity. These present major safety challenges lead to quick capacity degradation in LIBs. Herein, we present the synergistic effects of nanostructured silicon and SrTiO3 (STO) for use as anodes in Li-ion batteries. Si and STO nanoparticles were incorporated into a multiwalled carbon nanotube (CNT) matrix using a planetary ball-milling process. The mechanical stress resulting from the expansion of Si was transferred via the CNT matrix to the STO. We discovered that the introduction of STO can improve the electrochemical performance of Si/CNT nanocomposite anodes. Experimental measurements and electrochemical impedance spectroscopy provide evidence for the enhanced mobility of Li-ions facilitated by STO. Hence, incorporating STO into the Si@CNT anode yields promising results, exhibiting a high initial Coulombic efficiency of approximately 85%, a reversible specific capacity of ~800 mA h g−1 after 100 cycles at 100 mA g−1, and a high-rate capability of 1400 mA g−1 with a capacity of 800 mA h g−1. Interestingly, it exhibits a capacity of 350 mAh g−1 after 1000 lithiation and delithiation cycles at a high rate of 600 mA hg−1. This result unveils and sheds light on the design of a scalable method for manufacturing Si anodes for next-generation LIBs. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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18. Numerical study of Maxwell nanofluid flow with MWCNT and SWCNT considering quartic autocatalytic reactions and Thompson-Troian slip mechanism.
- Author
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Mehmood, Y., Alsinai, Ammar, Niazi, Azmat Ullah khan, Bilal, Muhammad, and Akhtar, Tasneem
- Abstract
The impact of the Thompson and Troian slip restrictions on continuous nanofluid flow, including CNTs near the stagnation point with constricting/enlarging surfaces, examined using a mathematical model. Engine oil is utilized as the base liquid, and both single-wall (SWCNTs) and multi-wall (MWCNTs) carbon nanotubes are taken into consideration. A Darcy-Forchheimer permeable medium and quartic autocatalysis, a chemical reaction for MHD stagnation point flow, are used to study the heat and flow characteristics of non-Newtonian flow. The original mathematical model is also expanded to include the impact of buoyancy forces. The numerical solution of non-dimensional velocity, temperature, and concentration profiles is obtained using the MATLAB-created bvp4c function, which employs the three-stage Lobatto IIIa formula. In the limited case, the validity of the recommended mathematical model is assessed by comparison with published work. A strong consensus is reached in this regard. Many dimensionless flow parameters, including the velocity slip parameter, the inertial coefficient, solid volume fraction, magnetic parameter, and the velocity parameter, have graphical representations that illustrate their behavior. Surface drag force estimates are presented to analyze the consequences on the extended surface. It has been demonstrated that increasing the slip velocity parameter boosts fluid flow speed while reducing surface drag. The efficiency of local thermal transmission decreases as the endothermic/exothermic coefficient rises. The altering viscosity factor for nanofluids causes an increase in axial velocity while a decrease in temperature distribution. Engine oil enriched with MWCNT and SWCNT can improve the thermal conductivity and viscosity of lubricants, leading to reduce wear and tear and better engine performance as well. Furthermore the incorporation of quartic autocatalytic reactions can enhance chemical processes that rely on catalysis, improving reaction rates. Also it has diverse applications in the system of cooling devices, manufacturing and material processing and heat transfer systems. It is revealed through this study that the system is shown to moderately cool off as measured by the solid volume ratio and heat generation. The velocity ratio parameter and the thermal expansion parameter had opposing outcomes on the system’s internal heat transfer mechanism.Article Highlights: As we increase the volume fraction of nanoparticles, the velocity of the fluid diminishes while temperature profile exhibits enlargement. Temperature of the fluid flow portrays the fall off pattern for the enhanced values of thermal relaxation time. An enhancement in the exothermic and endothermic factor shows lowering the concentration profile. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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19. Max-phase Ti3SiC2 and diverse nanoparticle reinforcements for enhancement of the mechanical, dynamic, and microstructural properties of AA5083 aluminum alloy via FSP
- Author
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Almutairi Sahw S., Mosleh Ahmed O., Mohamed Samah Samir, Mahmoud Tamer Samir, and Moustafa Essam B.
- Subjects
max-phase ti3sic2 ,dynamic properties ,mechanical properties ,microstructure ,cnts ,graphene ,sin ,nanocomposites ,Technology ,Chemical technology ,TP1-1185 ,Physical and theoretical chemistry ,QD450-801 - Abstract
This study investigated the effects of max-phase Ti₃SiC₂ and other nanoparticle reinforcements (graphene, CNTs, and SiN) on the mechanical and dynamic properties of friction stir processed (FSPed) AA5083 aluminum composites. Microstructural analysis revealed the impact of these reinforcements on grain size. Dynamic properties were assessed using a free vibration impact test, while mechanical properties were measured through a compression test. Most composites showed enhancements in damping ratio and natural frequency compared to the base alloy, with the Ti₃SiC₂ leading to a substantial increase in natural frequency. The AA5083/max phase Ti3SiC2 composite demonstrated the most significant improvements across nearly all properties, notably enhancing stiffness (+7.35% in E), strength (+25.36% in yield strength), and vibration resistance (+5.83% in fₙ), while significantly reducing damping (−62.76% in ζ). In contrast, the friction stirred AA5083 offered moderate enhancements in strength (+17.86% in yield strength) and a slight increase in natural frequency (+2.00%) but did not significantly improve stiffness and actually increased damping. The base alloy AA5083 served as the baseline for comparison, exhibiting the lowest performance in all categories. The findings highlight the potential of FSP and reinforcement, especially Ti3SiC2, for tailoring the properties of AA5083 for enhanced performance in various applications. These findings emphasize the significance of customizing the reinforcement material to attain the intended mechanical characteristics in AA5083 composites.
- Published
- 2024
- Full Text
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20. In situ growth of carbon nanotubes on fly ash substrates
- Author
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Liu Song, Wang Tianhao, Wang Hongchang, Hui David, Li Haitao, Gong Minghui, Cai Bianyue, Zhang Duanyang, Xu Kechun, and Tang Aoyu
- Subjects
cnts ,in situ growth ,fly ash ,Technology ,Chemical technology ,TP1-1185 ,Physical and theoretical chemistry ,QD450-801 - Abstract
Carbon nanotubes (CNTs) are one-dimensional nanomaterials exhibiting specialized structures and exceptional mechanical, electrical, and chemical properties. CNTs find application in the fabrication of composite materials, material modification, and hydrogen storage. However, their widespread adoption in material modification is challenging due to their expensive manufacturing and proclivity toward agglomeration. This review expounds the evolution and future directions of in situ growth of CNTs on fly ash substrates through chemical vapor deposition or microwave heating methods. The unique structure and composition of fly ash engenders low-carbon and environmentally friendly properties while facilitating the self-growth of CNTs on its substrate. This paper delves into the characteristics and growth mechanism of the in situ-grown CNTs, with an analysis of mechanical properties, wave absorption, friction, applications, and innovations of fly ash in situ-grown CNTs as modifiers, adsorbents, and additives. The prepared fly ash in situ-grown CNTs have various advantages such as better dispersion properties, lower carbon emissions, and reduced preparation cost, enhancing their applicability in material modification and creation.
- Published
- 2024
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- View/download PDF
21. Engineering in ceramic albite morphology by the addition of additives: Carbon nanotubes and graphene oxide for energy applications
- Author
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Rehman Zia Ur, Yao Shanshan, Nazir Muhammad Altaf, Ullah Hameed, Aziz Irum, Blel Asma, Karim Mohammad R., Hanif Muhammad Bilal, Munir Mamona, Park Dong Yong, and Choi Dongwhi
- Subjects
synthesis ,albite ,graphene oxide ,cnts ,surface morphology ,Technology ,Chemical technology ,TP1-1185 ,Physical and theoretical chemistry ,QD450-801 - Abstract
The synthesis of zeolite nanoparticles is studied comprehensively by adding an organic template as a reflux method, extracted from crystals. The zeolite nano-crystals are quite effectively synthesized by incorporating silica, organic template, and alkali metal. The tetrapropylammoniumhydroxide, tetrapropylammoniumbromide and tetraethyl orthosilicate (TEOS) as organic templates are added for the assistance of zeolite (albite) crystals. A cross-linker TEOS is also mixed. Adding carbon nanotubes and graphene oxide made the morphology of albite more interesting. Nucleation time is an important feature for the formation of albite crystals. The albite nano-shaped crystal is developed for instance when reaction time is less than 240 h, after this period crystal size increases with time. Batch 1 of zeolite is prepared with additives for testing its morphology, like surface area, particle size shape, and crystal geometry. The general trend (e.g., pore volume, percentage composition, particle size, geometry) of zeolite nano-crystal is explained by the help of robust techniques such as Fourier transform infrared spectroscopy, X-ray diffraction, Brunauer–Emmett–Teller, energy-dispersive X-ray spectroscopy, and scanning electron microscopy.
- Published
- 2024
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22. Tailored eutectic alloy coating for enhanced EMI and X-ray protection by basalt fiber CNT/epoxy composite
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Vivek Dhand, Cho Hyunsuk, Tufail Hassan, Chong Min Koo, and Kyong Yop Rhee
- Subjects
Basalt fiber ,Epoxy composites ,Bi–Sn ,CNTs ,Electromagnetic interference ,X-ray leakage ,Mining engineering. Metallurgy ,TN1-997 - Abstract
In this study, eutectic-Bi–Sn-coated basalt fiber (BF)-reinforced carbon nanotube (CNT)/epoxy hybrid composites were fabricated for dual functionality, i.e., in managing and shielding clinical X-ray radiation and electromagnetic interference (EMI). BF mats were coated with Bi–Sn nanoparticles and subsequently layered with multi-walled CNTs mixed epoxy resin using the vacuum-assisted resin transfer method. High resolution field emission scanning electron microscopy revealed a good dispersion of Bi–Sn nanoparticles over BF and, CNTs within the epoxy matrix. X-ray diffraction analysis confirmed the presence of Bi–Sn, basalt, and CNT phases in the composites. High-resolution Raman spectroscopy revealed characteristic peaks corresponding to the CNTs, epoxy, and Bi–Sn phases. EMI total shielding effectiveness (SET) analysis in the X-band frequency range (8.2–12.4 GHz) demonstrated that the Bi–Sn/BF/CNT/epoxy (S3) exhibits the highest SET value of 30.4 dB, which is attributable to the synergistic effect of the Bi–Sn coating and CNT filler. Analysis of X-ray-radiation leakage revealed that all the composite samples effectively attenuated X-rays with minimal leakage, limited to 6.8 mR. These results indicate the potential of these composites for applications as eco-friendly, non-toxic, and lead-free various industries including healthcare, electronics, aerospace, and defense.
- Published
- 2024
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23. Bio-based epoxy resin/carbon nanotube coatings applied on cotton fabrics for smart wearable systems.
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Faggio, Noemi, Olivieri, Federico, Bonadies, Irene, Gentile, Gennaro, Ambrogi, Veronica, and Cerruti, Pierfrancesco
- Subjects
- *
CARBON nanotubes , *EPOXY coatings , *COTTON textiles , *EPOXY resins , *ELECTROTEXTILES , *GLASS transition temperature , *SURFACE coatings - Abstract
[Display omitted] Electroactive coatings for smart wearable textiles based on a furan bio-epoxy monomer (BOMF) crosslinked with isophorone diamine (IPD) and additivated with carbon nanotubes (CNTs) are reported herein. The effect of BOMF/IPD molar ratio on the curing reaction, as well as on the properties of the crosslinked resins was first assessed, and it was found that 1.5:1 BOMF/IPD molar ratio provided higher heat of reaction, glass transition temperature, and mechanical performance. The resin was then modified with CNT to prepare electrically conductive nanocomposite films, which exhibited conductivity values increased by eight orders of magnitude upon addition of 5 phr of CNTs. The epoxy/CNT nanocomposites were finally applied as coatings onto a cotton fabric to develop electrically conductive, hydrophobic and breathable textiles. Notably, the integration of CNTs imparted efficient and reversible electrothermal behavior to the cotton fabric, showcasing its potential application in smart and comfortable wearable electronic devices. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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24. Enhanced Interfacial Charge Transport of Ni Metal–Organic Framework Nanosheets Interconnected by Carbon Nanotubes for Capacitive Deionization.
- Author
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Hu, Jianing, Xi, Wen, Zhang, Jiahui, Zhang, Youfang, Wang, Rui, Wang, Huanwen, Gong, Yansheng, He, Beibei, and Jin, Jun
- Abstract
Metal–organic frameworks (MOFs) have shown significant potential in hybrid capacitive deionization owing to their unique structure and adjustable pore size. However, their limited electronic conductivity and electrochemical stability hinder their practical application. In this study, we developed hierarchically structured Ni-MOF nanosheets interconnected by carbon nanotubes (Ni-MOF@CNT) through a one-pot hydrothermal reaction. By combining the porous structure of Ni-MOF with the synergistic effect of Ni
2+ ions and CNTs, the Ni-MOF@CNT electrode with fast interfacial charge transfer demonstrates a high desalination capacity of 47.58 mg g–1 and excellent cycling stability. Additionally, the Ni-MOF@CNT electrode demonstrates a remarkable Li+ ion extraction capacity of 30.29 mg g–1 . [ABSTRACT FROM AUTHOR]- Published
- 2024
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25. Improving resistance to embedded delaminations by adding CNTs to epoxy in carbon/(epoxy + CNT) composites.
- Author
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Rao, Chukka Atchuta, Murthy, K S R K, and Chakraborty, D
- Abstract
Low-velocity impact on fiber-reinforced polymer (FRP) composites may cause subsurface interface delaminations. In the case of such multiple delaminations, neighboring delaminations may grow and coalesce into larger delamination under post-impact loading. The resistance to such growth is substantially influenced by the strength and stiffness of epoxy resins used in FRP composite laminates. Therefore, the current study attempts to determine how adding carbon nanotubes (CNTs) to epoxy might potentially enhance the resistance to such delaminations. A three-dimensional (3D) finite element analysis has been carried out for laminates having single embedded delamination as well as two neighboring embedded delaminations to determine the interlaminar stresses and strain energy release rate using virtual crack closure integral. Results from the current analysis show that while parameters like shape, size, and relative spacing of delamination influence the growth, however in all the cases, adding CNTs to epoxy significantly improves the resistance to the growth of both single and interacting delaminations. The effect is observed to be more pronounced when the delaminations are closely spaced and tend to coalesce into a large delamination. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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26. Carbon nanotubes for optimizing response stability and speed of acrylate hybrid copolymers humidity sensor.
- Author
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Yu, Xueting, Hu, Xuqi, Ma, Xu, Chen, Guanyin, Ling, Yueqiang, Jin, Tao, and Chen, Yufang
- Abstract
Carbon nanotubes (CNTs) are one‐dimensional nanomaterials with a hollow structure, high specific surface area and excellent chemical conductivity, which show great potential for application in the field of humidity‐sensitive responsive materials and humidity sensors. In this paper, CNTs were composited with a hybrid copolymer (HAC) of octavinyl POSS/acrylate to prepare the hybrid copolymer composites HAC/CNTs and their humidity sensors, which demonstrated exceptional thermal stability and fast response speed. Among them, acrylic resin serves as a humidity‐sensitive material; POSS introduce a stable three‐dimensional cage skeleton structure to the material; and CNTs are used as conductive fillers, which further enhance the stability of the material, as well as improve the sensitivity and humidity‐sensitive response speed of the material. The experimental findings indicate that the HAC/8.0% CNTs composite material exhibits a remarkable sensitivity of 119.94 KΩ/%RH within the humidity range of 11%–95%RH. Compared with HAC, HAC/8.0% CNTs demonstrate a significant reduction in response/recovery time from 16.0 s/70.0 s to 0.8 s/80.0 s, representing a considerable improvement in response speed; the wet hysteresis is reduced from 0.88 %RH to 0.77 %RH; and the temperature change coefficient is reduced from 0.035 %RH/°C to 0.008 %RH/°C over the temperature range of 20–60°C, indicating superior stability against temperature variation. Meanwhile, the humidity response mechanism of HAC/CNTs was discussed by using complex impedance spectrum. The hybrid copolymer composites, HAC/CNTs, that were prepared in this study have tremendous potential in the development of advanced, high‐performance, and miniaturizable humidity sensing technologies. Highlights: A hybrid copolymer composite humidity‐sensitive material HAC/CNTs is prepared.HAC/CNTs are compounds consisting of CNTs and POSS/acrylate hybrid copolymer.POSS improve the skeleton structural stability of acrylic resins.CNTs enhance the sensitivity and response speed of humidity sensor.The HAC/8.0% CNTs have higher response stability and faster response speed. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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- View/download PDF
27. Carbon-based nanomaterials: synthesis, types and fuel applications: a mini-review.
- Author
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Sajid, Muhammad, Iram, Ghazala, Nawaz, Aqsa, Qayyum, Wajeeha, Farhan, Ahmad, Qamar, Muhammad Azam, Nawaz, Haq, and Shahid, Asma
- Subjects
- *
CARBON nanotubes , *GRAPHENE , *FUEL systems , *POTENTIAL energy , *FUEL cells , *FULLERENES - Abstract
Carbon is one of the most abundant minerals in the universe. The world’s energy needs are being unmet due to the exponential rise in population. Since its inception 20 years ago, carbon and its allotropes, including fullerenes, carbon nanotubes, and graphene, have been marketed as potential energy storage and generation materials. By solving important issues like accumulation and inadequate thermodynamic compatibility, carbon fiber, expanded graphite, and carbon nanotubes are promising functional materials that can be used to improve the performance of bipolar plates further. There are several potential uses for carbon-based nanomaterials (CBNMs) in the energy area. This mini-review provides an overview of the synthetic routes employed for producing CBNMs, categorizing them based on their types, elucidating their diverse applications in fuel energy systems, and emphasising the uses of CBNMs in energy. The advantages and disadvantages of several synthetic processes have been examined and compared. The types of CBNMs, like carbon nanotubes, graphene, carbon dots, and fullerenes, are explored in terms of their unique structural properties and fabrication methods. Furthermore, the utilization of CBNMs in fuel energy systems, such as fuel cells, energy storage devices, and catalysis, is comprehensively reviewed. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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28. Study on Mechanical and Electrical Properties of High Content CNTs/Cu Composites.
- Author
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Xiu, Ziyang, Sun, Jinpeng, Li, Xiao, Chen, Yihao, Yan, Yue, Shao, Puzhen, Li, Haozhe, Ju, Boyu, Yang, Wenshu, and Chen, Guoqin
- Subjects
- *
COPPER , *HOT pressing , *SPECIFIC gravity , *CARBON composites , *ELECTRIC conductivity - Abstract
It is expected that composites made of carbon nanotubes (CNT) and copper (Cu) display both mechanical and electrical properties, but the low damage dispersion and high-quality composite of high-content CNTs have always been research difficulties. In this paper, high-content CNTs/Cu composites were prepared. The effects of the sintering method, sintering temperature, directional rolling and the CNTs' content on the relative density, hardness and electrical conductivity of the composites were studied. The uniform dispersion of high-content CNTs in Cu matrix was achieved by ball milling, sintering and rolling, and the processes did not cause more damage to the CNTs. The properties of composites prepared by spark plasma sintering (SPS) and vacuum hot pressing sintering (HPS) were compared, and the optimum process parameters of SPS were determined. When the CNTs' content is 2 wt.%, the hardness is 134.9 HBW, which is still 2.3 times that of pure Cu, and the conductivity is the highest, reaching 78.4%IACS. This study provides an important reference for the high-quality preparation and performance evaluation of high-content CNTs/Cu composites. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
29. “Green” Aqueous Synthesis, Structural, and Optical Properties of Quaternary Cu2ZnSnS4 and Cu2NiSnS4 Nanocrystals.
- Author
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Ivakhno‐Tsehelnyk, Oleksandra, Selyshchev, Oleksandr, Kondratenko, Serhiy, Dzhagan, Volodymyr, and Zahn, Dietrich R. T.
- Subjects
- *
OPTICAL properties , *NANOCRYSTALS , *THIN films , *THERMOELECTRIC materials , *ABSORPTION coefficients , *RAMAN scattering - Abstract
Element substitution in Cu2ZnSnS4‐like chalcogenides offers the potential to create alternative low‐cost photovoltaic and thermoelectric materials with tunable properties. In this work, the “green” synthesis of colloidal cation‐substituted Cu–Ni–Sn–S nanocrystals (CNTS NCs) in aqueous solutions using thioglycolic acid as a stabilizer is reported for the first time. The structural and optical properties of CNTS NCs are studied in colloidal solutions and thin films, and are compared with those of Cu–Zn–Sn–S (CZTS) NCs obtained under similar conditions. The NC sizes of both compounds are estimated to be in the range of 1.5–2.5 nm. Both NCs exhibit strongly non‐stoichiometric composition and a structure corresponding to cationically disordered kesterite Cu2ZnSnS4, which are common features of such quaternary metal‐based chalcogenides. The phonon Raman spectra of CNTS and CZTS NCs exhibit very similar lineshapes, but the CNTS phonon band has a larger width and lower frequency, presumably due to stronger cation disorder. The absorption of both types of NCs extends continuously through the visible range with an estimated bandgap of ≈2.2 eV and sub‐bandgap absorption due to an Urbach tail. The absorption coefficient of CNTS is determined to be
α > 102 cm−1 at 700 nm andα > 104 cm−1 at 400 nm. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
30. Investigating Enhanced Microwave Absorption of CNTs@Nd 0.15 -BaM/PE Plate via Low-Temperature Sintering and High-Energy Ball Milling.
- Author
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Wang, Chengying, Feng, Xiaohua, Yu, Chengwu, Zhang, Lixia, Zhou, Shengguo, Liu, Yi, Huang, Jing, and Li, Hua
- Subjects
- *
DIELECTRIC polarization , *DIELECTRIC relaxation , *DEBYE'S theory , *BARIUM ferrite , *COMPOSITE plates - Abstract
Composite plates comprising a blend of rare earth neodymium-(Nd) doped M-type barium ferrite (BaM) with CNTs (carbon nanotubes) and polyethylene WERE synthesized through a self-propagating reaction and hot-pressing treatment. The plates' microscopic characteristics were analyzed utilizing X-ray diffraction (XRD), Fourier transform infrared spectrophotometry (FTIR), thermo–gravimetric analysis (TGA), Raman, and scanning electron microscopy (SEM) analytical techniques. Their microwave absorption performance within the frequency range of 8.2 to 18 GHz was assessed using a vector network analyzer. It showed that CNTs formed a conductive network on the surface of the Nd-BaM absorber, significantly enhancing absorption performance and widening the absorption bandwidth. Furthermore, dielectric polarization relaxation was investigated using the Debye theory, analyzing the Cole–Cole semicircle. It was observed that the sample exhibiting the best absorbing performance displayed the most semicircles, indicating that the dielectric polarization relaxation phenomenon can increase the dielectric relaxation loss of the sample. These findings provide valuable data support for the lightweight preparation of BaM-based absorbing materials. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
31. Synergistic hybrid effect of nano fillers on the structure and properties of asphalt composites.
- Author
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Xie, Weizhen, Qi, Cong, Wang, Bei, Li, Qian, and Wang, Shiwei
- Abstract
The CNTs/nano ZnO/SBS/asphalt composites with different CNTs content were prepared by solution casting method. The morphology of the composite shows that the dispersion of SBS is improved by the synergistic hybrid effect of CNTs and nano ZnO. Good dispersion is beneficial for enhancing the adsorption of lightweight components, thereby effectively improving the temperature range of asphalt use. At the same time, the increase in the proportion of asphaltene leads to an increase in the number of honeycomb structures, the surface roughness of composite materials, as well as the water contact angle. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
32. In-situ grown carbon nanotubes on waste glass powder: Resource-efficient preparation and machine-learning based dispersion evaluation
- Author
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Tingquan Shao, Hongrui Zhang, Zhenjun Wang, Tonghuan Zhang, Xu Xu, Haibao Zhang, Xiaofeng Wang, and Haoyan Guo
- Subjects
CNTs ,In-situ growth ,Microwave radiation ,Dispersion ,CSA pore solution ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Carbon nanotubes (CNTs) are the strongest candidates as reinforcing and functionalizing materials in civil engineering. However, CNTs have severely limited the application of carbon nanomaterials in civil engineering materials because of high-cost preparation and inhomogeneous dispersion. In this paper, a new method of direct in-situ grown CNTs on the surface of waste glass powder (WGP) by microwave pyrolysis is employed. It can control the particle size and growth of CNTs while effectively improving the CNTs dispersion and saving natural resources. The dispersibility of in-situ grown CNTs and MWCNT in aqueous and cement pore solutions is evaluated based on DLS and improved machine learning and image processing methods. The conductivity as well as the compressive strength of the electrically conductive cementitious materials increases linearly with increasing dispersion. This work facilitates further optimization of CNT-cement nanocomposite dispersion and has great potential for improving WGP utilization efficiency.
- Published
- 2024
- Full Text
- View/download PDF
33. Carbon Nanotube-Polymer Nanocomposites for Energy Storage and Conversion
- Author
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Simon, Shilpa, Aswathi, V. P., Sreeja, P. B., Moharana, Srikanta, editor, Rout, Lipeeka, editor, and Sagadevan, Suresh, editor
- Published
- 2024
- Full Text
- View/download PDF
34. Thermoelectric Power Generation from Low-Cost Carbon-Based Materials
- Author
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Choudhary, Chandra Shekhar, Dhass, Avithi Desappan, Prasad, Ranjit, Krishna, Ram, Ghosh, Arindam, Series Editor, Chua, Daniel, Series Editor, de Souza, Flavio Leandro, Series Editor, Aktas, Oral Cenk, Series Editor, Han, Yafang, Series Editor, Gong, Jianghong, Series Editor, Jawaid, Mohammad, Series Editor, Sahu, Rina, editor, Prasad, Ranjit, editor, and Sahoo, K. L., editor
- Published
- 2024
- Full Text
- View/download PDF
35. Introduction to Graphene Quantum Dots
- Author
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Manjubaashini, N., Thangadurai, T. Daniel, Nataraj, D., Thomas, Sabu, Thakur, Vijay Kumar, Series Editor, Manjubaashini, N., Thangadurai, T. Daniel, Nataraj, D., and Thomas, Sabu
- Published
- 2024
- Full Text
- View/download PDF
36. Nanotechnology in Bacterial Livestock Disease Diagnosis
- Author
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Mamatha, Dodla, Maurya, Saumya, Swati, Kumari, Kumar, Alla Yaswanth Naveen, Varshney, Rajat, Yadav, Pavan Kumar, Prasad, Minakshi, Ghosh, Mayukh, Singh, Rameshwar, Editorial Board Member, Malik, Yashpal Singh, Series Editor, Gehlot, A. K., Editorial Board Member, Raj, G. Dhinakar, Editorial Board Member, Bujarbaruah, K. M., Editorial Board Member, Goyal, Sagar M., Editorial Board Member, Tikoo, Suresh K., Editorial Board Member, Prasad, Minakshi, editor, Kumar, Rajesh, editor, Ghosh, Mayukh, editor, Syed, Shafiq M., editor, and Chakravarti, Soumendu, editor
- Published
- 2024
- Full Text
- View/download PDF
37. Role of Carbon Nanomaterials in Energy Generation, Storage, and Conversion
- Author
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Khan, Noureen Amir, Rahman, Gul, Husen, Azamal, Series Editor, Jawaid, Mohammad, Series Editor, Bachheti, Archana (Joshi), editor, and Bachheti, Rakesh Kumar, editor
- Published
- 2024
- Full Text
- View/download PDF
38. Functionalized Carbon Nanotubes Biomedical Applications and Toxicological Implications
- Author
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Goyal, Urvashi, Singh, Vineeta, Chaubey, Kundan Kumar, Sharma, Shalini, Bhardwaj, Gaurav, Singh, Krishan Raj, Husen, Azamal, Series Editor, Jawaid, Mohammad, Series Editor, Bachheti, Archana (Joshi), editor, and Bachheti, Rakesh Kumar, editor
- Published
- 2024
- Full Text
- View/download PDF
39. Graphene-CNT Hybrid Structures for Energy Storage Applications
- Author
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Khosravifar, Mahnoosh, Kondapalli, Vamsi Krishna Reddy, Fang, Qichen, Shanov, Vesselin, and Gupta, Ram K., editor
- Published
- 2024
- Full Text
- View/download PDF
40. Doped Lithium Titanates and their Composites with Carbon Nanotubes as Anodes for Lithium-Ion Batteries
- Author
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Stenina, I. A., Kulova, T. L., and Yaroslavtsev, A. B.
- Published
- 2024
- Full Text
- View/download PDF
41. The Microstructure and Mechanical Properties of Carbon Nanotube-Reinforced W-Matrix Composites
- Author
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Wei, Yanni, Li, Yaru, Chen, Yu, Zhu, Linghao, and Guo, Bingbing
- Published
- 2024
- Full Text
- View/download PDF
42. Simulation and characterization of Co3O4/carbon nanotube-filled PVC nanocomposites for medium-voltage cable applications
- Author
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Alkhursani, Sheikha A., Aldaleeli, N., Elbasiony, A. M., Ghobashy, Mohamed Mohamady, Madani, Mohamed, Al-Gahtany, Samera Ali, Zaher, Ahmed, and Sharshir, A. I.
- Published
- 2024
- Full Text
- View/download PDF
43. Impact of CNTs Incorporation on Structural, Optical and Dielectric Properties of Ag Doped Spinel CoFe2O4 Nanohybrid and Their Photovoltaic Possibilities
- Author
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Routray, Krutika L. and Saha, Sunirmal
- Published
- 2024
- Full Text
- View/download PDF
44. Numerical analysis of non-linear radiative Casson fluids containing CNTs having length and radius over permeable moving plate
- Author
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Rafique Khadija, Mahmood Zafar, Adnan, Khan Umar, Ali Bilal, Awwad Fuad A., and Ismail Emad A. A.
- Subjects
yamada–ota model ,cnts ,nonlinear thermal radiation ,mass suction ,numerical analysis ,Physics ,QC1-999 - Abstract
Casson fluids containing carbon nanotubes of various lengths and radii on a moving permeable plate reduce friction and improve equipment efficiency. They improve plate flow dynamics to improve heat transfer, particularly in electronic cooling and heat exchangers. The core objective of this study is to investigate the heat transmission mechanism and identify the prerequisites for achieving high cooling speeds within a two-dimensional, stable, axisymmetric boundary layer. This study considers a sodium alginate-based nanofluid containing single/multi-wall carbon nanotubes (SWCNTs/MWCNTs) and Casson nanofluid flow on a permeable moving plate with varying length, radius, and nonlinear thermal radiation effects. The plate has the capacity to move either parallel to or perpendicular to the free stream. The governing partial differential equations for the boundary layer, which are interconnected, are transformed into standard differential equations. These equations are then numerically solved using the Runge–Kutta fourth-order scheme incorporated in the shooting method. This research analyses and graphically displays the effects of factors including mass suction, nanoparticle volume fraction, Casson parameter, thermal radiation, and temperature ratio. Additionally, a comparison is made between the present result and the previous finding, which presented in a tabular format. The coefficient of skin friction decreases in correlation with an increase in Casson fluid parameters and Prandtl number. Heat transfer rate decreases with a variation in viscosity parameter, while it is increasing with an increase in Prandtl number. In addition, this study demonstrates that heat transfer rate for MWCNT is significantly higher than that of SWCNT nanoparticles. Thermal radiation and temperature ratio reduce the heat transfer rate, whereas nanoparticle volume fraction and Casson parameter enhance it over a shrinking surface.
- Published
- 2024
- Full Text
- View/download PDF
45. Viscoelastic modelling and analysis of two-dimensional woven CNT-based multiscale fibre reinforced composite material system
- Author
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Ashirbad Swain, Vignesh Palani, Sigil Francis, Benedict Thomas, and Tarapada Roy
- Subjects
CNTs ,Conventional carbon fibres ,CNTs based woven fabric composite ,Mori–Tanaka micromechanics ,Weak viscoelastic interphase ,Unit cell method ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Abstract Carbon nanotube (CNT) has fostered research as a promising nanomaterial for a variety of applications due to its exceptional mechanical, optical, and electrical characteristics. The present article proposes a novel and comprehensive micromechanical framework to assess the viscoelastic properties of a multiscale CNT-reinforced two-dimensional (2D) woven hybrid composite. It also focuses on demonstrating the utilisation of the proposed micromechanics in the dynamic analysis of shell structure. First, the detailed constructional attributes of the proposed trans-scale composite material system are described in detail. Then, according to the nature of the constructional feature, mathematical modelling of each constituent phase or building block’s material properties is established to evaluate the homogenised viscoelastic properties of the proposed composite material system. To highlight the novelty of this study, the viscoelastic characteristics of the modified matrix are developed using the micromechanics method of Mori–Tanaka (MT) in combination with the weak viscoelastic interphase (WI) theory. In the entire micromechanical framework, the CNTs are considered to be randomly oriented. The strength of the material (SOM) approach is used to establish mathematical frameworks for the viscoelastic characteristics of yarns, whereas the unit cell method (UCM) is used to determine the viscoelastic properties of the representative unit cell (RUC). Different numerical results have been obtained by varying the CNT composition, interface conditions, agglomeration, carbon fibre volume percentage, excitation frequency, and temperature. The influences of geometrical parameters like yarn thickness, width, and the gap length to yarn width ratio on the viscoelasticity of such composite material systems are also explored. The current study also addresses the issue of resultant anisotropic viscoelastic properties due to the use of dissimilar yarn thickness. The results of this micromechanical analysis provide valuable insights into the viscoelastic properties of the proposed composite material system and suggest its potential applications in vibration damping. To demonstrate the application of developed novel micromechanics in vibration analysis, as one of the main contributions, comprehensive numerical experiments are conducted on a shell panel. The results show a significant reduction in vibration amplitudes compared to traditional composite materials in the frequency response and transient response analyses. To focus on the aspect of micromechanical behaviour on dynamic response and for the purpose of brevity, only linear strain displacement relationships are considered for dynamic analysis. These insights could inform future research and development in the field of composite materials.
- Published
- 2024
- Full Text
- View/download PDF
46. Decoration of carbon nanotubes in the substrate or selective layer of polyvinyl alcohol/polysulfone thin-film composite membrane for nanofiltration applications
- Author
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Mahdie Safarpour, Niloofar Fathi Majd, Samira Jabbarvand Behrouz, Samira Arefi-Oskoui, and Alireza Khataee
- Subjects
CNTs ,Desalination ,Dip-coating technique ,Nanofiltration ,PSf membranes ,Thin-film nanocomposite membranes ,Chemistry ,QD1-999 - Abstract
Nanofiltration (NF) membranes demonstrate considerable promise for desalinating saline water and wastewater containing mineral salts to overcome the lack of fresh water and improve drinking water quality. This research work aims to detect the influence of carbon nanotubes (CNTs) on the filtration performance of polyvinyl alcohol (PVA)/polysulfone (PSf) thin-film composite NF membranes. For this purpose, CNTs were incorporated in the PSf substrate/PVA selective layer to fabricate a thin-film composite (TFC) with nanocomposite substrate (nTFC) and a thin-film nanocomposite (TFN) membranes, respectively. To fabricate TFC membranes, PSf substrates with different concentrations (16–20 wt%) were made using the phase inversion technique. Then, the selective layer of PVA was formed on the PSf support through cross-linking with glutaraldehyde during dip-coating. The membranes’ NF performance was assessed by filtration of NaCl and Na2SO4 solutions at a relatively low pressure of 0.3 MPa. The salt rejection of all prepared membranes followed the sequence of Na2SO4 > NaCl, indicating the characteristics of negatively charged membranes. By embedment of 0.05 wt% CNT in the PSf substrate/PVA selective layer, the rejections of over 43% for NaCl and over 80% for Na2SO4 were obtained, which is higher than that of TFC-16 as a control membrane (18.1% for NaCl and 74.7% for Na2SO4). Furthermore, in the presence of CNTs, the permeance and fouling resistance of the nTFC and TFN membranes have been improved compared to the TFC-16 membrane.
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- 2025
- Full Text
- View/download PDF
47. Facile Al2O3 coating suppress dissolution of Mn2+ in Mn-substituted Na3V2(PO4)3 with outstanding electrochemical performance for full sodium ion batteries.
- Author
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Qian, Chenghao, Shi, Mengna, Fan, Chunfang, Liu, Changcheng, Huang, Que, and Chen, Yanjun
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- *
SODIUM ions , *ALUMINUM oxide , *IONIC conductivity , *SURFACE coatings , *STRUCTURAL stability , *ELECTRON transport , *EMBEDDING theorems - Abstract
[Display omitted] • Mn2+ substitution generates beneficial holes to accelerate electron transport while supporting the structure to stabilize the framework. • Al 2 O 3 coating has the triple effect of reducing HClO 4 concentration, inhibiting the dissolution of Mn and acting as a conductive agent. • NVMP@CNTs@1wt.%Al 2 O 3 possesses a porous structure, effectively promoting the rapid Na+ transport. • The excellent structural stability is confirmed by in situ XRD. • NVMP@CNTs@1wt.%Al 2 O 3 reveals a remarkable sodium storage property in both half and full cells. Na 3 V 2 (PO 4) 3 (NVP) encounters significant obstacles, including limited intrinsic electronic and ionic conductivities, which hinder its potential for commercial feasibility. Currently, the substitution of V3+ with Mn2+ is proposed to introduce favorable carriers, enhancing the electronic conductivity of the NVP system while providing structural support and stabilizing the NASICON framework. This substitution also widens the Na+ migration pathways, accelerating ion transport. Furthermore, to bolster stability, Al 2 O 3 coating is applied to suppress the dissolution of transition metal Mn in the electrolyte. Notably, the Al 2 O 3 coating serves a triple role in reducing HClO 4 concentration in the electrolyte, inhibiting Mn dissolution, and functioning as the ion-conducting phase. Likewise, carbon nanotubes (CNTs) effectively hinder the agglomeration of active particles during high-temperature sintering, thereby optimizing the conductivity of NVP system. In addition, the excellent structural stability is investigated by in situ XRD measurement, effectively improving the volume collapse during Na+ de-embedding. Moreover, the Na 3 V 5.92/3 Mn 0.04 (PO 4) 3 /C@CNTs@1wt.%Al 2 O 3 (NVMP@CNTs@1wt.%Al 2 O 3) possesses unique porous structure, promoting rapid Na+ transport and increasing the interface area between the electrolyte and the cathode material. Comprehensively, the NVMP@CNTs@1wt.%Al 2 O 3 sample demonstrates a remarkable reversible specific capacity of 122.6 mAh/g at 0.1 C. Moreover, it maintains a capacity of 115.9 mAh/g at 1 C with a capacity retention of 90.2 mAh/g after 1000 cycles. Even at 30 C, it achieves a capacity of 87.9 mAh/g, with a capacity retention rate of 84.87 % after 6000 cycles. Moreover, the NVMP@CNTs@1wt.%Al 2 O 3 //CHC full cell can deliver a high reversible capacity of 205.5 mAh/g at 0.1 C, further indicating the superior application potential in commercial utilization. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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48. Oxygen‐Doped Porous Carbon Nanotubes Encapsulated Bismuth Oxide to Enhance the Performance of Lithium‐Sulfur Battery.
- Author
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Zeng, Xingyan, Tang, Yakun, Liu, Lang, Zhang, Yue, Gao, Yang, and Qian, Mao
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LITHIUM sulfur batteries ,CARBON nanotubes ,BISMUTH trioxide ,DOPING agents (Chemistry) ,POLYSULFIDES ,ADSORPTION (Chemistry) ,CARBON composites - Abstract
Lithium‐sulfur batteries (LSBs) are greatly promising next‐generation energy storage systems due to their high theoretical specific capacities and energy density. However, the dissolution of lithium polysulfides (LIPs) causees low capacity and short lifespan, impeding the practical application of LSBs. To address this challenge, the composites of oxygen‐doped porous carbon nanotubes (CNTs) wrapped in Bi2O3 were synthesized by the calcinating method (CNTs@Bi2O3). The CNTs@Bi2O3 composites as absorbent immobilize LIPs via the physical limitations of porous CNTs and the chemical adsorption of Bi2O3 and carbon‐oxygen polar bond. After loading sulfur, the CNTs@Bi2O3/S composites with the encapsulated structure can provide a large space to withstand the significant volume expansion during the electrochemical reaction process, ensuring the stability of the electrode structure. Thus, the batteries with CNTs@Bi2O3/S exhibit a high capacity (1232 mA h g−1 at 0.1 C) and good cycle stability (639.1 mA h g−1 after 150 cycles at 0.5 C). This work presents an innovative design suitable for the encapsulated structure of Bi2O3, serving as a valuable reference for the development of Bi2O3 in LSBs. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
49. Enhanced thermal shock resistance of low‐carbon Al2O3‐C refractories via CNTs/MgAl2O4 whiskers composite reinforcement.
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Feng, Chunzhuo, Xiao, Guoqing, Ding, Donghai, Lei, Changkun, Lv, Lihua, Chong, Xiaochuan, Feng, Yuan, and Zou, Chao
- Subjects
- *
CARBON nanotubes , *THERMAL shock , *THERMAL resistance , *REFRACTORY materials , *WHISKERS , *ALUMINUM composites , *MICROCRACKS - Abstract
The CNTs/MgAl2O4 whiskers composite reinforcement was prepared by catalytic carbon‐bed sintering and added to low‐carbon Al2O3‐C refractories to enhance the thermal shock resistance of refractories. The effects of Ni(NO3)2·6H2O content on the phase and microstructure of CNTs/MgAl2O4 were investigated. The nano‐indentation technology was used to quantitatively evaluate the effect of CNTs/MgAl2O4 on the thermal shock resistance of low‐carbon Al2O3‐C refractories, and the toughening mechanism of CNTs/MgAl2O4 on refractories was further investigated. The results revealed that the inner and outer diameters of the CNTs were approximately 5.69 and 16.26 nm, respectively. The CNTs winded around interlocking structural MgAl2O4 whiskers with a high aspect ratio (>100), which was beneficial to the dispersion of CNTs in the refractory matrix. The thermal shock resistance of low‐carbon Al2O3‐C refractories was significantly improved by adding 3.0 wt.% of CNTs/MgAl2O4 (named C3). The specific fracture energy of refractory matrix and residual strength ratio of C3 reached 141 N·m−1 and 39.2%, which were 29.4% and 97.0% higher than those of the blank sample (109 N·m−1 and 19.9%), respectively. This is because the refractory matrix was significantly reinforced by CNTs and MgAl2O4 whiskers, promoting the occurrence of "bridging" and "crack deflection" and the generation of microcracks in the refractory matrix. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
50. MHD Flow of Dusty Jeffrey Fluid Flow Containing Carbon Nano Tubes (CNTs) under Influences of Viscous Dissipation and Newtonian heating.
- Author
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Habib, N. A. N. N., Arifin, N. S., Zokri, S. M., and Kasim, A. R. M.
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NEWTONIAN fluids , *MAGNETIC fluids , *ORDINARY differential equations , *PARTIAL differential equations , *DUST , *NANOFLUIDICS - Abstract
This current research examines the behaviour of dusty Jeffrey fluid across an inclined stretching sheet with CNTs as well as aligned magnetohydrodynamic (MHD). By utilising the proper similarity transformation variables, the governing partial differential equations (PDEs) of the problem are converted to ordinary differential equations (ODEs). Then, the numerical results are produced by using the Runge-Kutta-Fehlberg (RKF45) approach with the aid of the MAPLE software. The findings include the visual illustrations of the impacts on the velocity and temperature profiles for several pertinent parameters. It clearly shows that the decline in velocity profile of fluid phase was caused by the rise in aligned angle, ratio of relaxation to retardation times, magnetic field and fluid particle interaction parameters. Meanwhile, for every parameter that is involved excluding ratio of retardation time in the fluid, the temperature profile rises in both the fluid and dusty phases. The results of this study add a unique perspective to the existing literature by offering fresh insights on the influence of CNTs and dust particles, examining their impact on two-phase flowover an inclined stretching sheet. This understanding can be utilized in the real-time application where rapid and efficient thermal management is critical such as electronics cooling or energy conversion systems. Furthermore, the inclusion of viscous dissipation andNewtonian heating (NH) effects contributes to the novelty of the research, providing a comprehensive understanding of the complex interactions in this unique fluid flow scenario. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
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