Search

The microcrystalline cellulose/thermoplastic starch (MCC/TPS) film was prepared by melt extrusion method, and the MCC/TPS film was combined with paper by hot pressing method. The results show that the SEM images show that the interface layer of paper-plastic composite has good adhesion. When the addition a-mount of MCC is 5wt%, the mechanical properties of TPS film are improved, and the path of water vapor through TPS film is extended, resulting in the water vapor transmittability of MCC/TPS/paper composite is reduced, and the barrier properties of paper-plastic composite are improved. TPS/paper composites and MCC/ TPS/paper composites have better physical properties (i.e. smoothness, flexibility and folding resistance) than paper alone. Therefore, the addition of MCC can improve the barrier properties and mechanical properties of paper-plastic composite materials to meet the requirements of the food packaging industry for low water sensitive materials. [ABSTRACT FROM AUTHOR]

Using silver nanowires prepared by polyol method as conductive filler and kapok m i cro-fi brill at ed cellulose as carrier, the composite paper was prepared by vacuum filtration. The samples were characterized by scanning electron microscopy, X-ray diffractometer. X-ray photoelectron spectrometer, four-probe tester and vector network analyzer, and the effects of silver nanowire content on their electrical conductivity and electromagnetic interference shielding effectiveness were investigated. The results showed that the silver nanowires as one kind of one-dimensional silver elemental nanomaterial, were uniformly distributed in the composite paper and formed an excellent conductive network. When 2.5wt% of silver nanowires were added to the pure cellulose paper, the electrical resistance of the paper dropped from 470.57 MD • cm to 1.26 mH • cm. When the concentration of silver nano wires was increased from 2.5 wt% to 1 Owt%, the conductivity of the paper increased from 793.65 S/cm to 3039.51 SZcm, and the electromagnetic interference shielding effectiveness increased from 38.1 dB to 61.5 dB. [ABSTRACT FROM AUTHOR]

Two kinds of cellulose/ZnO piezoelectric papers are prepared by crushing and dissolving methods. The papers are characterized by SEM and analyzed by a piezoelectric equipment. The differences in the structure and piezoelectric performance of the two kinds of papers are explored. The effects of ZnO add-on amount, thickness of the papers, and pressure on the piezoelectric properties are discussed and compared with a PVDF film. The mutts show that the fibers of the piezoelectric paper prepared by the dissolving method are smooth and tightly bounded to ZnO, which makes ZnO uniformly coat on the surface of the fibers. The higher the pressure, the higher the piezoelectric properties. The thicker the piezoelectric paper, the higher the piezoelectric properties. The piezoelectric paper with 20% ZnO added by the dissolving method has high piezoelectric properties, and the maximum output current is 52.36 nA/cm². The piezoelectric properties of the piezoelectric paper are comparable to the purchased PVDF film. [ABSTRACT FROM AUTHOR]

In this paper, isopropyl triolein titanate is used as the modifier to modify the cellulose nanofiber (CNF), then the modified cellulose nanofiber is coated on the surface of A4 paper, and cured to obtain isopropyl triolein titanate (KR-TTS) modified nanocellulose paper-based barrier coating. The hydrophobicity and mechanical property of blank paper, nanocellulose paper-based coating (CNF coating), isopropyl triolein titanate modified nanocellulose paper-based coating with different KR-TTS/CNF mass ratios (K-CNF coating) are characterized by video optical contact measuring instrument and electronic tensile machine. The results show that the K-CNF coating sample with a KR-TTS/CNF mass ratio of 151 has the largest water contact angle, which is 113.4° and 98.4° higher than that of CNF coating and has better hydrophobicity. Compared with the CNF coating, the tensile strength, elastic modulus and toughness of the coating sample are increased by 156.73%, 101.69% and 430.41 %, respectively. The sample exhibits better mechanical properties. The barrier performance test of the coating shows that the air permeability of the modified coating sample with a mass ratio of KR-TTS/CNF of 1:1 is 25234 s/25 cm", which is 46.65 times lower than that of the CNF coating. Water vapor transmission rate is 1 203.67 g/mJ • 24 h, which is 73.47% lower than the CNF coating, and the barrier performance is well. In addition, the SEM images of the modified coating samples show that the tightly wound 3T) network structure fills the paper pores that the CNF coating fails to fill, forming a denser coating and giving it better barrier properties and toughness. [ABSTRACT FROM AUTHOR]

The preparation and formation characterization of carbon fiber paper were carried on in this paper. The results showed that the appropriate beating degree of plant fiber was abtained at 45- 50° SR for a relatively good formation of carbon fiber paper. In the condition of carbon fiber content 5%, the burst index of carbon fiber paper could be reach to 5 kPa • m² /g or up, tear index could be reach to 8.0 mN • m²/g, and breaking length was about 6 km. The better formation could be gained in the condition of 4 mm length of carbon fiber. Under the same applied voltage condition, when the carbon fiber content increased from 5% to 10%, the resistance value dropped sharply. When the carbon fiber content was continued increasing, decreasing trend of the resistance value slowed down. The different electrical requirements of carbon fiber paper could be achieved by adjusting the content of carbon fiber. [ABSTRACT FROM AUTHOR]

Low temperature curing conductive silver paste is a key functional material for the preparation of various electronic components. Silver and ethyl cellulose were used as conductive fillers. According to the mass ratio of ethyl cellulose/silver nitrate of 2 = 1, 1 = 1, 1=2 and 1=3, short rod-shaped conductive silver was prepared by redox method. Through the resistivity measurement and microscope observation, the effects of physical factors (heating sintering, ultraviolet light irradiation, water soaking, ultrasonic waves, etc.) on the electrical conductivity of the electronic paper formed by the short rod-shaped conductive silver paste were studied. The electronic paper obtained at a ratio of 2 = 1 and 1 = 1 was extremely resistant, and the electrical resistivity of the electronic paper at a ratio of 1 = 2 and 1 = 3 could be reduced to 50% to 60% of the initial value during the heating and sintering process. At the same time, the conductivity was relatively stable under the conditions of heating and sintering, ultraviolet light irradiation, water soaking, ultrasonic wave, etc., and the conductivity of ethyl cellulose/silver nitrate for the ratio of 1 = 2 was extremely well. Finally, the conductive silver paste prepared by the ethyl cellulose/silver nitrate mass ratio of 1 = 2 was mixed with the ink in a volume ratio of 30%, 45%, 60%, respectively. And the mixture was coated onto the paper to obtain electronic paper, and then sintered. The resistivity dropped to 96.6% of the starting value, which was 15 mΩ/cm. [ABSTRACT FROM AUTHOR]

Surface-enhanced Raman scattering is a highly sensitive and non-invasive analytical technique. This technique can be widely used for the identification and quantitative analysis of materials. In this paper, a simple method for preparing SERS substrates was proposed. First, graphene oxide (GO) was absorbed on the filter paper by leaching-lifting, followed by homogeneous deposition of noble metal nanoparticles by plasma sputtering on the filters. The surface-enhanced Raman scattering properties of the substrate were analyzed with a concentration of 10-5 mol/L rhodamine 6G (R6G). The results show that GO had a good fluorescence quenching effett in Raman detection. The gold and silver nanoparticles with an absorption peak of 532 nm greatly enhanced the Raman scattering signal of R6G via localized surface plasmon resonance (TSPR). In addition, the fiber structure of the filters was able to capture more R6G molecules. Hence, the substrate exhibited excellent SERS characteristics. [ABSTRACT FROM AUTHOR]

Conductive silver paste is a key functional material for the preparation of electronic components. Conductive silver paste with silver and starch used as conductive fillers was prepared by redox method with molar ratio of starch to silver nitrate of 2: 1, 1 : 1, 1 : 2 and 1 : 3. The effect of physical factors, such as heating and sintering, ultraviolet light irradiation, soaking water, and ultrasonic wave, on the conductivity of the conductive silver paste was studied by measuring resistance, and the morphology of the conductive silver paste was observed with a microscope. The results showed that when the starch/silver nitrate was 1 : 3, the uniform conductive particles with starch as core and silver particles as shell were formed. When the ratio was 1 : 2 and 1 : 3, the resistivity decreased to 60% to 70% of the initial value during the low-temperature heating and sintering. The resulting silver paste was resistant to UV light, blisters and ultrasound. Among them, the conductivity for the sample prepared with the molar ratio of 1 : 3 was the best. Finally, a silver paste with a starch/silver nitrate ratio of 1 : 3 was mixed with 30%, 45%, or 60% of the ink, coated with paper, and subjected to low-temperature thermal sintering, and the resulting electronic paper had a resistivity of 10 mΩ/cm. [ABSTRACT FROM AUTHOR]

As a kind of renewable fiber, tencel fiber has the characteristics of multiple fibril structure. Tencel fiber prepared by fibrillation treatment can be widely used in materials such as supercapacitors and battery separators. In this paper, the highly fibrillated tencel fiber was selected, and the influence of the structure of tencel fiber paper on its dielectric constant and breakdown voltage was discussed. The results show that the measured values of the relative dielectric constant of the tencel fiber paper were in good agreement with the empirical calculations based on the volumetric empirical formula. Using 40 g/m2 electrolytic capacitor paper prepared with tencel fiber, the dielectric strength after calendering could reach 18.27 kV/mm. Considering the composite dielectric series capacitance model, the breakdown voltage of the double-layer tencel fiber paper could be calculated according to the parameters of single-layer paper, thereby guiding the structural formula design of the doublelayer capacitor separator. [ABSTRACT FROM AUTHOR]

The continuous upgrading of the automobile industry has put forward higher requirements for the performance and lightweight effect of aluminum alloys. Heat treatment is an effective way to improve the performance of aluminum alloy, but how to obtain the optimal combination of heat treatment process parameters is an urgent problem. In this paper, the influence of heat treatment process parameters (solution temperature, solution time, aging temperature, aging time) on mechanical properties was systematically studied, and the relationship model between mechanical properties and heat treatment process parameters was established. The micromorphology under different process parameters were analyzed by ESDB and SEM. The results show that when the solution temperature was 530 ℃, the solution time was 1 h, the aging temperature was 170 ℃, and the aging time was 6 h, the mechanical property of 6082 aluminum alloy profiles was the best. The yield strength was 313 MPa, the tensile strength was 350 MPa, and the elongation after break was 13.21%. The relationship model between Y value (yield strength, tensile strength, and elongation after fracture) and key process factors was established, in which the solution temperature had the greatest influence. When the solution temperature was 530 ℃, the grain size was the smallest, and the mechanical properties of the precipitated fine Mg2Si phase and Al(FeMnSi) phase were the best, and the tensile fracture was mainly the dimpled fracture. This paper provides theoretical basis and practical guidance for the optimization of heat treatment process parameters of aluminum alloy profiles. [ABSTRACT FROM AUTHOR]

The electro-acoustic (frequency response) characteristics of the loudspeaker usually be affected by the mechanical properties of the paper diaphragm. The mechanical properties of the diaphragm were improved by modifying the natural fiber. In this work, the structure of Manila hemp fiber and the mechanical properties, electro-acoustic performance of paper diaphragm were discussed on the effects of alkali concentration and treatment time. The surface morphology, crystal structure and chemical composition of Manila hemp fiber treated before and after were characterized by SEM, XRD, FT-IR, TGA. The results showed that the fiber surface roughness increased, and the crystallinity of the fiber increased and then decreased as the alkali concentration or the treatment time increased. The lignin and hemicellulose on the fiber surface were decreased. The thermo-stability of cellulose improved the same time lignin’s decreased. When the alkali concentration was too large or the treatment time was too long, the cellulose will be degraded, the mechanical strength of the diaphragm was affected. The fiber diaphragm has the best mechanical properties and electro-acoustic performance with 5 wt% of the alkali concentration, 3 h of the treatment time. [ABSTRACT FROM AUTHOR]

The biodegradable composite material was prepared by injection molding with PHBV as matrix and microcrystalline cellulose and waste paper fiber as reinforcements. The iffects of MCC with different mass fraction and waste paper fiber with different mass fraction on the mechanica properties, water absorption and interfacial properties of the composites were investigated. The results show that the mechanical properties of the composites after adding MCC have been improved and the mechanical properties of the composites are the best when the mass fraction of MCC is 3%. And the composite material after blending and filling has the best combination mechanical properties when the mass fraction of waste paper is 10%. The water absorbency of composites increases with the increase of fiber content in waste paper. Scanning electron microscopy analysis shows that the compatibility of MCC with P-HBV interface is better and the interfacial properties of blended waste paper fibers decrease. [ABSTRACT FROM AUTHOR]

Nanofluids based on seawater can be used as hydraulic medium in marine hydraulic equipment to solve the problem of fluid deterioration caused by seawater intrusion in traditional hydraulic fluids. In this paper, seawater-based SiC nanofluids were prepared by a two-step method using natural seawater as the base fluid, and the dispersion stability and viscosity characteristics of nanofluids with different group distribution ratios were investigated by the single-variable method. The results showed that NaCl destroyed the particle double electric layer and reduced the nanofluid stabilization coefficient, but the surfactant CMC could be adsorbed on the surface of SiC particles to provide spatial site resistance, so that the stabilization coefficient was maintained at about 0.9 within 10 days. Meanwhile, it was verified that the best nanofluid dispersion stability was achieved with SiC particle size at 40 nm, mass fraction at around 1%, and CMC mass fraction at around 2%. The viscosity of seawater-based nanofluid increased with the increase of particle addition, and the rising trend slowed down when the mass fraction was greater than 1%. With the increase of CMC addition, the microstructure in the nanofluid was affected, so that the viscosity of the seawater-based nanofluid increased with the increase of the CMC mass fraction, and the rising trend was smooth-sharp-smooth. The viscosity was negatively correlated to the temperature by the effect of Brownian motion, and the viscosity of the nanofluid decreased with the increase of NaCl mass fraction, and the decreasing trend was fast and then slow. The seawater-based nanofluids prepared in this paper have good dispersion stability, and the desired viscosity can be obtained by regulating the group distribution ratio, which is helpful for the further development of nanofluid technology. [ABSTRACT FROM AUTHOR]

Vegetable oil as a base carrier fluid for nano magnetic fluids suffers from the problem of poor cold flow behavior, and the addition of poly methacrylate is expected to reduce the pour point of vegetable oil and improve the low-temperature flowability of vegetable oil-based magnetic fluids. In this paper, a new environmentally friendly magnetic fluid was prepared by using Poly a OlefinCPAO-S) and corn oil as a composite base carrier fluid, and poly methacrylate as a depressant to study the stability of its settling. The low-temperature flow properties of the nano magnetic fluids at different temperatures were investigated from the viewpoints of magnetic field, temperature, Ni--0.5Zn0.5FeO4 mass fraction, PAO-8, and the addition of the depressant using a rotational viscometer. The results showed that the best settlement stability of the nanomagnetic fluids produced without surfactant, a mixture of 100 ml of corn oil and 25% of PAO-8 as the composite base carrier fluid, and Ni--0.5Zn0.5FeO4 mass fraction of 0.767%. The magnetic fluid with the addition of 0.5% poly methacrylate has better low-temperature flow properties and the pour point reaches --36 °C. Under the condition of no magnetic field, when the temperature is lower than 一25 °C, the viscosity of the magnetic fluid increases abruptly with an exponential rising trend, and the low temperature fluidity of the magnetic fluid becomes worse; under the condition of magnetic field, the viscosity of the nanomagnetic fluid is positively correlated with the magnetic field strength, and the viscosity curve changes significantly when the magnetic field strength is greater than 20 mT. The nano magnetic fluid prepared in this paper has the characteristics of environmental protection and good low-temperature fluidity performance, which can be applied to low-temperature working conditions, and this study contributes to the further development of low-temperature applications of environmentally friendly magnetic fluids. [ABSTRACT FROM AUTHOR]

In this paper, strong photoluminescence near-infrared (NIR)-emitting CdHgTe/ZnTe nanocrystals were synthesized using different thiol ligands 3-mercaptopropionic acid (MPA), L-Cysteine (L-Cys), and glutathione (GSH). This research utilizes a novel temperature-controlled microwave-assisted methodology via freezing-thawing (F-T) progress to synthesize superior CdHgTe/ZnTe core-shell nanocrystals. The study reveals that the photoluminescence quantum yields are markedly influenced by the synthesis parameters, including component types, concentration levels, and the choice of surface ligands. Different technologies including UV-vis, photoluminescence spectroscopy, transmission electron microscopy, powder X-ray diffraction and X-ray photoelectron spectroscopy were employed to characterize the as-prepared nanocrystals. The results showed that enhanced photoluminescence yield is primarily due to the low lattice mismatch (6%) between the CdHgTe core and the ZnTe shell materials, which significantly boosts the fluorescence stability and presents a low density of defects in the shell. Furthermore, the core-shell CdHgTe/ZnTe nanocrystals were successfully applied for fixed cells. The biocompatible ligands capped nanocrystals with bright fluorescence showed negligible photobleaching in fixed cells even after 40 min UV irradiation. This indicates that core-shell nanocrystals capped with L-Cysteine and Glutathione possess remarkably high resistance to photobleaching and oxidation. [ABSTRACT FROM AUTHOR]

In this paper, the microscopic mechanism and optical properties of nitric oxide (NO) molecules adsorbed on the surface of graphene were studied theoretically by using the first principles of plane wave ultra-soft pseudopotential calculation method based on density functional theory. In order to obtain more accurate results, the effects of dispersion interaction, long-range electron correlation effect and Van der Waals force are taken into account. The exchange correlation functional of DFT-D and generalized step approximation of PBE is used to optimize the geometric structure. The plane wave ultra-soft pseudopotential method is used to describe the interaction between electron and ion. The Kohn-Sham equation and the energy functional are solved by self-consistent method. According to the three adsorption sites on the surface of graphene - top site, bridge site and vacancy site, the adsorption model of NO molecules on the surface of 14 kinds of graphene was constructed. The adsorption energy, Mulliken distribution, differential charge density, state density and optical properties of NO molecules adsorbed on graphene surface were calculated. The results show that NO molecules are easily adsorbed on the surface of single-O doped, single-N doped and O-N double-doped graphene by chemical adsorption. All three kinds of doping will form a new impurity level near the Fermi level of graphene, which will help the electronic transition and improve the optical properties of graphene. In the range of visible light 360-780 nm, the optical properties of NO molecules adsorbed by C-N bond bridge site on the surface of O-N double-doped graphene are the best, and the peak absorption coefficient and reflection coefficient of O-N double-doped graphene are increased by about 1.40 times and 1.84 times, respectively, compared with that of undoped graphene. This work deepens the understanding of the process of NO molecule adsorption on graphene surface and its microscopic mechanism, and provides theoretical support for the study of NO sensing based on graphene materials. [ABSTRACT FROM AUTHOR]

Component diversity is one of the important ways to improve the amorphous formation ability and soft magnetic properties of Fe based amorphous nanocrystalline alloys. Based on Nanomet alloy, this paper designs the composition through Fe based binary phase diagram and uses single roll strip casting method to prepare Fe80(Al1Si1)2.4B12.6P4Cu1(x/y=0, 1/5, 1/2, 1/1, 2/1) alloy. The influence of x/y changes on the amorphous formation ability, thermal stability, and soft magnetic properties of the alloy is explored. The research shows that the increase of x/y ratio can enhance the initial crystallization temperature and amorphous formation ability of the alloy. When x/y=1, the amorphous formation ability of Fe80(Al1Si1)2.4B12.6P4Cu1(x/y=0, 1/5, 1/2, 1/1, 2/1) alloy is higher, and the annealing temperature window is widened. After annealing at 500 ℃ for 1 min, it exhibits excellent soft magnetic properties, with coercivity of 1.27 A/m and magnetic permeability of 17551. Due to the Fe content remains unchanged, the doping of Al has a minor impact on the saturation magnetic induction of the alloy. [ABSTRACT FROM AUTHOR]

Photocatalytic technology is driven by solar energy and has a very broad application prospect in the fields of environmental governance and hydrogen energy preparation. g-C3N4 is a promising green photocatalyst, but its limited visible light response range and wide energy gap limit the further improvement of its photocatalytic performance. Non-metallic element doping is an effective method to improve the photocatalytic activity of g-C3N4 . In this paper, the influence mechanism of B element doping on the photocatalytic activity of g-C3N4 was studied by first-principles calculation, and the electronic structure and optical properties before and after doping were investigated. The results show that the H site on the g-C3N4 (001) surface is the most stable site for B atom doping, and the doping energy is - 7.81 eV. The addition of B element reduced the energy gap of g-C3N4 (001) surface from 1.468 eV to 0.732 eV, and the work function decreased from 4.055 eV to 3.108 eV and improved the reactivity of surface C atoms, so that the photocatalytic activity of g-C3N4 (001) surface was effectively improved. The study of optical properties shows that the addition of B element makes the g-C3N4 (001) surface have an obvious “red shift” phenomenon, which improves the light response ability of the surface and obtains higher photocatalytic ability. [ABSTRACT FROM AUTHOR]

In order to enhance the stability of VO2(M) while reducing its phase transition temperature, the hydrothermal synthesis process of VO2(M) was optimized in this paper using vanadium pentoxide (V2O5) as the vanadium source and hydrazine hydrate (N2H4·H2O) as the reducing agent. By doping W6+ and depositing SiO2 on the surface, stability is improved while phase transition performance is guaranteed. The results show that there is a VO2(A)-VO2(M) mutual transformation process during the hydrothermal process, and the adjustment of the hydrothermal reaction conditions can lead to VO2(M) with good crystallinity, a phase transition temperature of 66.3 ℃ and a thermal hysteresis width of 9.2 ℃. With the increase of W doping amount (expressed by atomic fraction), the Tc of W-VO2(M)@SiO2 decreases, and ΔT=7.2 ℃ when W doping amount is 1.0 at%. After accelerated test, the VO2 of W-VO2(M)@SiO2 composite still exists as V4+, which has good thermal stability. [ABSTRACT FROM AUTHOR]

Due to the large consumption of traditional energy and environmental pollution, it is more and more important to explore efficient and clean new energy sources. Zinc-empty battery has been widely concerned as a kind of green and clean energy, but its slow cathodic oxygen reduction (ORR) reaction limits its large-scale application. Therefore, it is very important to develop an efficient and green economic non-precious metal catalyst for oxygen reduction reaction. In this paper, metal-organic framework (MOF) is used as the precursor, Fe-N doped carbon electrocatalyst (Fe-N-C) was synthesized by high temperature pyrolysis. Fe-N-C catalyst can avoid the aggregation and dissolution of metal atoms due to its strong metal-nitrogen coordination structure, so that the metal atoms are uniformly dispersed on the nitrogen-doped carbon carrier, and achieve high ORR performance. The prepared Fe-N-C-2 catalyst has abundant pore structure and a large number of Fe-NX active sites. The half-wave potential is 0.91 V in alkaline electrolyte and 0.75 V in acidic electrolyte. At the same time, it is applied to zinc-air batteries with an open circuit voltage of up to 1.47 V and a power density of 163.1 mW/cm². This strategy provides a promising approach for designing two-dimensional structures to construct high-performance electrocatalysts. [ABSTRACT FROM AUTHOR]

In order to solve the problems that the phase change temperature of fatty acid is higher than the building application requirements, and the existing fatty acid microencapsulated phase change materials have low encapsulation rate and low latent heat, the binary phase change material capric acid-stearic acid was first prepared in this paper. The thermal properties results show that the phase change temperature and latent heat of phase change of capric acid-stearic acid are 24.28 ℃ and 178.21 J/g, which meet the building application requirements. On this basis, CA-SA@SiO2 MPCM (microencapsulated phase change materials) with different core wall mass ratio were prepared by sol-gel method of capric acid-stearic acid with silica as the outer wall material. Micro morphology, particle size, thermal properties, chemical stability and anti-seepage performance of the MPCM were characterized. The results show that core wall mass ratio directly affects the properties of the MPCM. The optimal core wall mass ratio is 50: 50. The MPCM is spherical, smooth and dense, the particle size ranges from 2 to 500 μm, and the mainly concentrated below 50 μm. The wall material covers the core material only by physical action, and the thermal stability of phase change core material can be improved after microencapsulation. Moreover, the thermal decomposition temperature is significantly higher than the use environment of the wall material. The equilibrium leakage rate is only 4.53%, and the phase change temperature is 24.63 ℃, which is within the comfort range of human body. The latent heat of phase change and encapsulation rate is 138.16 J/g and 77%, respectively. It effectively solves the problems of high phase change temperature, low encapsulation rate and low latent heat of phase change, and provides a new material compatible with suitable temperature zone, high energy efficiency density and high stability for phase change energy storage building envelopes. [ABSTRACT FROM AUTHOR]

In this paper, the atomic structure and thermodynamic property aspects of the high-temperature melts of Ni-Zr alloys with different compositions are investigated using molecular dynamics simulations to analyze the factors affecting their amorphous formation ability. By observing the change of the average atomic volume with temperature during the cooling process and the change of the proportion of amorphous structure in the visual analysis of the configuration at 300 K, it is found that the amorphous formation ability of Ni-Zr alloy shows a significant decrease and then rebound in the interval of 60%-90% of Ni content. The thermodynamic parameters such as mixing enthalpy, mixing entropy, and mixing free energy did not show significant correlation with the amorphous formation ability, and the change of the second-order partial derivative of the mixing free energy reflected that the change of the thermodynamic factors significantly affected the amorphous formation ability. The structural parameters such as two-body distribution function and coordination number, which are closely related to the amorphous formation ability, show a weak correlation, and the Warren-Cowley parameter and bond length analysis reveal that the variation of Ni-Zr bond shows the same trend with the amorphous formation ability. This study is helpful to deepen the understanding of the relationship between high-temperature melting and amorphous formation ability of alloys. [ABSTRACT FROM AUTHOR]

At present, the development of renewable energy has become an important part of the global sustainable energy strategy. Hydrogen is the cleanest energy in the world and is considered to be the most promising alternative energy. Industrial hydrogen production contains a large number of impurities. Therefore, the purification of hydrogen is an indispensable part of the use of hydrogen energy. Palladium and its alloy membranes are the most common materials for hydrogen separation, but they are too expensive and insufficient in yield. We need to find new hydrogen separation membranes with excellent performance. It is found that the hydrogen permeability coefficient of V/Nb and its alloy membranes is much larger than that of Pd, and the cost is lower than that of Pd metal, which is the best hydrogen separation membrane material to replace Pd metal. At present, there are many studies on V/Nb-based alloy membranes. This paper introduces the principle of hydrogen permeation of alloy membranes, the preparation methods of hydrogen separation membranes and their advantages and disadvantages, as well as the research status of V/Nb-based alloys in recent years, and looks forward to the future research and development trend of hydrogen separation membranes. [ABSTRACT FROM AUTHOR]

The layered vanadium oxide electrode material has a series of advantages such as high capacity, considerable high temperature performance, low cost and good safety, and is one of the alternative electrode materials for the next generation of high-performance secondary ion batteries. Although the energy storage performance of layered vanadium oxide electrode materials is continuously improving, the problem of poor structural stability of layered vanadium oxides during the cycling process has not been solved. The layered NH4V4O10 material has been widely concerned and applied because of its special structural stability. In this paper, the electrochemical performance and energy storage mechanism of layered NH4V4O10 materials in different types of ion batteries are systematically summarized and discussed, and the optimization strategy of NH4V4O10 materials is classified and expounded. Finally, the development prospect of layered NH4V4O10 materials is proposed, which provides new insights for further improving its electrochemical properties. [ABSTRACT FROM AUTHOR]

Postoperative bacterial infection of titanium implants is a common clinical complication. In this paper, arrays of oxygen-deficient barium titanate nanorods (BaTiO3-x) were constructed on the Ti surface by hydrothermal and annealing treatments. The synthesis of BaTiO3 nanorods was confirmed using scanning electron microscopy, transmission electron microscopy, and X-ray diffractometry, and the presence of oxygen vacancies was confirmed using X-ray photoelectron spectroscopy. The reactive oxygen species (ROS) generation ability of BaTiO3-x nanorod arrays under ultrasound was verified using methyl violet (MV) as a trapping agent. The results show that BaTiO3-x nanorod arrays can effectively generate hydroxyl radicals (·OH) under ultrasonic (US) irradiation. Antibacterial experiments were conducted with Staphylococcus aureus (S. aureus), and the antibacterial capacity of BaTiO3-x nanorod arrays under US was investigated by the plate spread method. The results showed that the antibacterial rate of BaTiO3-x against S. aureus reached 90.92% after 15 min of US irradiation. This study provides ideas for the preparation of antimicrobial coatings on titanium implant surfaces and lays the foundation for expanding US-responsive antimicrobial coatings. [ABSTRACT FROM AUTHOR]

In order to solve the problems of poor electrical conductivity and low material utilisation of MnO2 materials in water-based zinc-ion batteries (ZIBs), this paper took agricultural waste coconut shells as raw materials, introduces low-cost, abundant, and green renewable biomass resources into electrode materials, and obtained coconut shell carbon with excellent conductivity through high-temperature carbonization. MnO2 nanopar-ticles were grown on the surface of coconut shell carbon by hydrothermal method to obtain coconut shell carbon@MnO2 composite nanomaterials. By using scanning electron microscopy (SEM), X-ray diffraction (XRD), electrochemical techniques and other characterization testing methods, the morphology, structure, and electrochemical performance of the composite material were analyzed. The results showed that the specific capacity of coconut shell carbon@MnO2 was still as high as 344.6 mA h/g after 300 cycles at a current density of 100 mA/g, and its performance was much higher than that of commercial MnO2 materials (64.3 mA h/g). The excellent electrical conductivity of coco carbon@MnO2, the nanosized structural design improved the material utilisation, reduced the ionic diffusion path, brought faster ionic diffusion rate and improved the multiplicity performance of the material, which had a good application prospect. [ABSTRACT FROM AUTHOR]

To improve the optical, electrical, and low-radiation performance of FTO thin films, in this paper, tantalum doped FTO(TFTO) films were successfully prepared on soda-calcium glass by aerosol assisted chemical vapor deposition (AACVD). The monobutyl tin chloride (MBTC) was used as tin source, ammonium fluoride (NH4F) as fluorine source, methanol as solvent, tantalum pentachloride (TaCl5) as tantalum source and sodium-calcium glass as base. The phase composition, micro-morphology, optical properties, electrical properties, and low radiation properties of the films were analyzed using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), X-ray photoelec-tron spectroscopy (XPS), a spectrophotometer, and a Hall effect tester. The results show that TFTO (SnO2 : F, Ta) has a tetragonal rutile structure and is an N-type semiconductor. When Ta/Sn atomic ratio is 1 %, the visible transmittance T is 74.18%, the resistivity ρ is 2.78 X 10-4 Ω • cm, the carrier concentration n is 1.44 X 1021/cm³, the mobility µ is 18.73 cm²/(V • s), the infrared reflectance RIR is 94%, and the emissivity ε is 0.12. Tantalum doping can effectively improve the electrical properties, carrier concentration and infrared reflectance of FTO films, and has a low effect on visible transmittance. [ABSTRACT FROM AUTHOR]

Magnesium is an interesting class of solid-state hydrogen storage materials with high hydrogen storage capacity (7.6wt%) and reversible hydrogen absorption and release. However, the high temperature required for Mg hydrogen absorption and release and the slow kinetics of hydrogen release affect its practicality. In this paper, two different types of MXene (Nb2CClx and Ti2CClx) were prepared by the molten salt etching method with the ratio of Mg: MXene = 10: 1, and the effects of the addition of different types of MXene on the micro-structure and hydrogen absorption and discharge properties of metallic Mg were investigated. The results showed that the phase composition of the materials remained unchanged, but the particle size of the materials was further reduced after ball milling, which increased their specific surface area. The introduction of Nb2CClx and Ti2CClx, on the other hand, gives Mg a significant enhancement, which can effectively increase the hydrogen absorption and release rate of the material, with Mg@Nb2CClx releasing 5.0 wt% hydrogen in 200 s, and Mg@Ti2CClx releasing 5.3 wt% in 250 s. The introduction of Mg@Nb2CClx can also reduce the initial hydrogen absorption and release temperature of pure Mg by 10wt% Nb2CClx. The initial hydrogen absorption and release temperatures of the materials can also be lowered, with 10wt% Nb2CClx lowering the initial hydrogen absorption and release temperatures of pure Mg by 125 °C and 175 °C, respectively, and 10 wt% Ti2CClx lowering the initial hydrogen absorption and release temperatures of pure Mg by 100 °C and 125 °C, respectively. The results of hydrogen absorption and release kinetic fitting based on the Chou model showed that the addition of MXene shifted the rate-control step of Mg from surface permeation control to diffusion control, which improved the hydrogen absorption and release kinetic performance of Mg. [ABSTRACT FROM AUTHOR]

g-C3N4 is a highly promising green semiconductor photocatalyst, but its bandgap is wide and its utilization efficiency for visible light is limited. The photocatalytic performance of g-C3N4 can be effectively improved through element doping. This paper uses first principles methods to study the mechanism of the influence of non-metallic element B and metallic element Cu co doping on the electronic structure and optical properties of g-C3N4. The results indicate that the most stable localization point for B, Cu co-dopped g-C3N4, (001) surface is that B occupies the H site, while Cu occupies the N2 site. B. Compared with single B element doping, co doping with Cu can further reduce the energy gap and work function of g-C3N4 (001) surface. The addition of Cu mainly improves the electronic conductivity and light capture ability of B-doped g-C3N4 (001) surface, thereby enhancing photocatalytic activity. [ABSTRACT FROM AUTHOR]

Nanoarray of spinel transition metal oxides has unique advantages over its nanowires and nanoparti-cles, and has important applications in many fields such as energy storage, catalysis, magnetism and optoelectronics. In this paper, various factors (substrate, reaction temperature, reaction time, raw materials, etc.) affecting the structure and morphology of spinel transition metal oxide nanoarrays prepared by hydrothermal/solvothermal method are summarized. The correlation between the structure and morphology of nanoarrays and their properties is discussed. The related research on the hierarchical structure of spinel transition metal oxide nanoarrays is briefly introduced. It is hoped that it can promote the design and development of multifunctional or functionally integrated nanoarrays and broaden their application range. [ABSTRACT FROM AUTHOR]

Cellulose is one of the most abundant resources in nature. The third-generation aerogels prepared from cellulose have both the high porosity and large specific surface area of traditional aerogels and their own advantages. However, its inherent flammability, poor mechanical properties and low thermal stability limit its application. At present, the functionalization of cellulose aerogels and the development of a variety of functionalized composite aerogels have become a research hotspot. In this paper, the preparation process, functionalization methods and main application fields of cellulose aerogels are summarized. Finally, the problems of functional cellulose aerogels are discussed. [ABSTRACT FROM AUTHOR]

The price of alloying element Bi is low, and it has a high solid solubility in magnesium, and with the decrease of temperature, its solid solubility decreases, and the Mg3 Bi2 phase is precipitated, which improves the mechanical properties of magnesium. Therefore, Mg-Bi alloys have good solution and aging hardening potential. The addition of Sn, Mn, Al, Ca, Zn and other elements to Mg-Bi alloy can modulate the alloy microstructure and further increase the mechanical properties and corrosion resistance of the alloy. In this paper, the research progress of Mg-Bi alloys was introduced, and on the basis of summarizing the research achievements of Mg-Bi binary alloys, the microstructure and properties of Mg-Bi-Sn alloys, Mg-Bi-Mn alloys, Mg-Bi-Al alloys, Mg-Bi-Ca alloys, and Mg-Bi-Zn alloys were systematically summarized, and the effects of alloying on the second phase, grain size, texture and dynamic recrystallization of alloys were reviewed. The effects of alloying element types, addition amounts and hot working parameters on the mechanical properties of alloys were described, and the future research is prospected. The existing problems in the study of Mg-Bi alloys were summarized, and the future research was prospected. [ABSTRACT FROM AUTHOR]

In this paper, ethylenediamine, diethylenetriamine and triethylene tetramine were used as N source and boric acid as B source to prepare different precursors to directly high temperature ammonolysis polymerize borocarbonitrides (BCN-x, recorded as BCN-EDA, BCN-DETA and BCN-TETA, respectively). XRD, SEM, TEM, XPS, UV-Vis, and PL were used to analyze the chemical composition, morphology, and optical properties of samples. And the photocatalytic CO2 reduction performance of BCN-x samples was assessed without compromising agents and cocatalysts. The results show that all the prepared samples have lamellar structure, and BCN-EDA represents higher crystallinity and higher photocarrier separation efficiency. Under visible light irradiation at 350-780 nm, the produced BCN-x can reduce CO2 to CO and CH4, and BCN-EDA has the best photocatalytic CO2 reduction performance, with a CO yield of 32.20 µmoL/g and the photocatalytic stability can be maintained within 20 h. [ABSTRACT FROM AUTHOR]

Electrocatalysis of CO2 to methanol has important research value in the carbon peaking and carbon neutrality goals. In order to improve the conversion rate of CO2 and selectivity of methanol, this paper coordinated the construction of LDHs/CNTs hybrid with acid-alkaline CuAl-LDHs and carbon nanotube materials (CNTs) with excellent electrical conductivity, realizing the complementary advantages of the two materials, and improving their methanol production performance and electrical conductivity in both directions. The results show that compared with LDHs, the good dispersion and abundant weak base sites of the two compounds are more conducive to the adsorption and rapid diffusion of CO2 molecules on the surface of the catalyst. Meanwhile, lattice oxygen with high mobility and monovalent copper species with high reduction potential form redox cycles on the catalyst surface, significantly reducing the mass transfer resistance and electron transfer difficulty. The results showed that CuAl-LDHs/5% CNTs had high selectivity and current density towards methanol at -0.6 V (for reversible hydrogen electrodes), up to 80.7% and -6.5 mA/cm², providing reference value for the development of LDHs-based electrocatalysts with high CO2 conversion at low potential and high current density. [ABSTRACT FROM AUTHOR]

Soft magnetic powder core generally has a low strength, which is improved by using the resin impregnation process. In this study, inactive diluent (tetrachloroethylene) and active diluent 636 (trimethylol propane triglycidyl ether) were used as the mixed diluent of the 135 epoxy resin/methyltetrahydrophthalic anhydride impregnated system, and the influence of the dosage of tetrachloroethylene on the compressive strength and the influence of impregnation process on the magnetic properties for Fe-Si-Al powder cores were studied. In addition, the formula for calculating the actual compressive strength of soft magnetic powder core was modified based on the measured compressive strength and porosity. The results show that the compressive strength of the powder core is greatly improved by the impregnation process, while the magnetic properties change slightly. When the mass ratio of resin to diluent is about 1:2, the core compressive strength reaches a maximum value of 18.43 MPa. This indicates that the diluent can be fully and evenly mixed with the epoxy resin, and can be cross-linked and cured better with the curing agent at this ratio, which improves the mechanical properties of the epoxy resin accordingly. The research results on impregnation process and formula for calculating the compressive strength of soft magnetic powder cores in this paper can provide reference for the development of mass production processes to improve the strength of soft magnetic powder cores. [ABSTRACT FROM AUTHOR]

In this paper, industrial waste fly ash is used as the main material, combined with the binder (carboxymethyl cellulose CMC) and pore-making agent (charcoal powder), to explore the role and effect of the sintering additives (single-phase: CuO; Multiphase: TiO2-CuO-MgO) in the firing of fly ash based ceramic membrane support. Firstly, the effects of the amount of CuO additive on the macroscopic physical and chemical properties (pure water flux, flexure strength, acid/alkali corrosion rate) and microstructure characteristics (material composition and micro-morphology) of the support were investigated. Secondly, orthogonal experiments were conducted to study the performance of support under different proportions of TiO2-CuO-MgO, so as to obtain the optimal preparation scheme. The results show that at the firing temperature of 1 050 ℃, the sample performance is good when the CuO content is 1%(mass fraction). The pure water flux is 2 649.577 L/(m²·h·MPa), the bending strength is 49.677 MPa, the acid/alkali corrosion rate is 0.471%/0.107%, and the average pore size is 2.375 μm. The porosity is 45.347%. At 1 050 ℃, when the proportion of TiO2-Cuo-MGo is 1.5%(mass fraction) TiO2, 0.7%CuO and 5%MgO, the comprehensive performance of the sample is the best, and the performance data are as follows: pure water flux of 6 729.268 L/(m²·h·MPa), bending strength of 67.454 MPa, acid/alkali corrosion rate of 2.964%/1.427%, average pore size of 4.216 μm, and porosity of 48.608%. [ABSTRACT FROM AUTHOR]

In an effort to enhance the research efficiency of magnetorheological fluid (MRF) sedimentation stability and to improve the current reliance on experimental measurement for assessing sedimentation performance, this paper employs a kinetic approach to simulate a microscale mechanical model for magnetic particles. We propose a simulation method for MRF sedimentation under zero magnetic field conditions and validate it through inductance-based sedimentation detection experiments. Since MRF sedimentation occurs in the absence of a magnetic field, we extend the microscale mechanical model, originally developed under the influence of a magnetic field, by introducing the effects of Brownian and van der Waals forces. The simulation method is parameterized with MRF-specific values and compared against experimental data obtained through inductance-based sedimentation detection. The results demonstrate that the introduced simulation method, incorporating Brownian and van der Waals forces, accurately predicts MRF sedimentation rates, effectively addressing the time-consuming nature of current investigations into MRF sedimentation stability. [ABSTRACT FROM AUTHOR]

As one of the BiOX materials, BiOI has the advantages of narrow band gap and strong absorption of visible light. In this paper, TiO2-BIOI composites were prepared by solvothermal method using TiO2 as raw materials, and the effects of different TiO2 composites on the structure and photocatalytic performance of the materials were investigated by XRD, SEM, TEM, UV-vis, PL and photocatalytic degradation. The results showed that TiO2 with spherical particles was distributed between the layers of BiOI, whose combination improved the light response ability of the composite material in the visible light region and reduced the bandgap width. The emission spectra showed that TiO2-BiOI had an intrinsic emission peak at 467 nm, and the emission peak intensity decreased first and then increased slightly with the increase of TiO2 mass fraction, and the PL intensity of TiO2-BioI -30% was the lowest. Using methyl orange solution to simulate the degradation wastewater, the photocatalytic degradation rate of methyl orange by TiO2-BiOI composites increased first and then decreased with the increase of TiO2 composite mass fraction. At 180 min, the degradation rate of methyl orange by TiO2-BioI-30% was up to 99.57%, which was 100.62% higher than that by pure BiOI. After repeated use for 5 times, the degradation rate is still as high as 97.02%, which has excellent reuse performance. [ABSTRACT FROM AUTHOR]

In this paper, the rheological, electrical and mechanical properties of silver paste with different blends of epoxy resin and polyester resin were studied. The thixotropy and thixotropy recovery rate of resin silver paste were studied by rheometer, and the effect of rheology on printing film was discussed. In situ curving resistance test method was used to monitor the change of thermal curing resistance of silver resin paste. The results showed that the content of epoxy resin in silver paste had great influence on the resistance. The adhesion strength of resin silver paste on Al2O3 substrate was evaluated by the thrust test method, and the thermal impact performance of resin silver paste was evaluated. The results showed that when the ratio of epoxy resin to polyester resin was 1:0.6, the viscosity of C-1 silver paste was moderate, the thixotropic recovery rate was 58.03% after 10 s, and the printing surface was flat. After curing at 200 ℃ for 30 min, the resistance is about 2 Ω, the adhesion strength is about 10 N/mm², and the adhesion strength is not significantly deteriorated after thermal shock at 260 ℃. The comprehensive performance is better, and it is suitable for the process requirements of electronic components. [ABSTRACT FROM AUTHOR]

To obtain a high breakdown field and energy density of the energy storage capacitor based on composite ceramic materials, one of the difficulties is to study the effects of the interface and boundary layer of nanoparticles of the composite ceramic materials. In this paper, the characteristics and energy storage properties of BaTiO3@SiO2 composite ceramic materials obtained by sintering of BaTiO3 particles coated with SiO2 of different thicknesses were studied. It is found that the breakdown strength and discharge energy density of ceramic materials were improved by sintering BaTiO3 particles coated with SiO2. Reducing the size of BaTiO3 particles greatly increased the interface between BaTiO3 and SiO2, which affected the formation of new phases and changed the crystal structure. As a result, BaTiO3@SiO2 composite ceramics using larger filler particles have denser metallographic microstructure, higher breakdown field strength, and higher discharge energy density than BaTiO3@SiO2 composite ceramics using extremely fine filler particles. [ABSTRACT FROM AUTHOR]

White light emitting diodes have great advantages over traditional light sources owe to their energy-saving, environmental protection, high efficiency, and so on, which have a wide range of applications in indoor lighting, outdoor lighting, automotive lamps and electronic backlighting devices. It is always the unremitting pursuit of researchers in this field to obtain warm white light emitting diodes with low correlated color temperature (CCT=2 700-4 500 K), high color rendering index (CRI, Ra>80), cost saving and suitable for human eyes. Red phosphor can effectively improve the shortcomings and enhance the luminescent performance of such devices, which plays an important role in high color rendering phosphor-converted white light emitting diodes. Therefore, its research and development is of great significance. In this paper, the research progress of Mn4+-doped fluoride red phosphor in recent years was reviewed, and the conventional and green preparation methods of this phosphor were introduced. In terms of the poor moisture stability of Mn4+-doped fluoride red phosphor, relevant studies on improving its moisture-resistance property were summarized. Prospectively, this review concludes with a brief view of potential challenges and future development directions of high-performance Mn4+ doped fluoride phosphor. [ABSTRACT FROM AUTHOR]

Silver-based electrical contact material is core component to ensure low-voltage apparatus efficient and safe operation. The performance specifications directly affect the safety and reliability of electrical equipment. On account of environment protection, traditional silver cadmium oxide electrical contact material containing cadmium, a heavy metal toxic element, is being phased out of existence. With the updating and upgrading of low voltage electrical equipment, higher performance requirements are proposed for silver-based electrical contact materials. In this paper, the failure mechanism of silver based electrical contact materials and the classification of common silver based electrical contact materials are discussed. At the same time, the existing problems, composition design and process optimization of various silver based electrical contact materials are comprehensively summarized. In combination with the research and development needs of various low-voltage apparatus efficients, suggestions for the development of silver based electrical contact materials in the future are given, which provides reference for the research and development of silver based electrical contact materials. [ABSTRACT FROM AUTHOR]

In this paper, the atomic structure and mechanical properties of NiNb alloys with different compositions were studied by molecular dynamics simulation. By comparing the change of glass transition temperature with the change of mixing enthalpy and mixing entropy of high temperature melt, it is found that the alloy shows a different trend before and after the component point cNi=0.65. At the same time, the atomic structure correlation analysis of NiNb alloy was carried out by using the methods of pair distribution function, coordination number, W-C parameter, bond pair analysis, and quasi neighbor atom, etc. It was found that some structural parameters also showed different trends before and after cNi=0.65, indicating that NiNb metallic glass had great differences in atomic structure before and after this component point. According to the thermodynamic and structural parameters, cNi=0.65 may be the dividing point of the two alloy systems. Before cNi=0.65, it is Nb base, while after cNi=0.65, it is Ni base. Finally, the mechanical properties were simulated, and it was found that the mechanical properties were mainly related to the binding mode of NiNb under different components. This study is helpful to deepen the understanding of the atomic structure and mechanical properties of metallic glass. [ABSTRACT FROM AUTHOR]

High efficiency catalyst technology can be used to treat pollutants in industrial wastewater, but single-phase catalyst has the problem of narrow response range of visible light. In this paper, ZnO/V2C/Fe2O3 ternary photocatalytic composites were prepared by electrostatic self-assembly, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Methylene blue dye was used as the target pollutant to study the photocatalytic performance of the ternary composite. The degradation rate of MB dye by ZnO/V2C/Fe2O3 ternary composite is 19.68 times and 21.76 times that of pure ZnO after 120 min irradiation with UV light and visible light, respectively. After the composite Fe2O3 and V2C, the band gap of ZnO is shortened, the excitation response range is extended to the visible region, and there are more specific surface area and more reactive sites, so the photocatalytic performance of ZnO is enhanced. [ABSTRACT FROM AUTHOR]

Objects can radiate emission of heat to outer empty space (〜3 K) through an atmospheric window (8-1 3/im), resulting in a possibility for radiative cooling. In this paper, ZnO doped MgHPO • 0.78H2 0 powder was synthesized by two-step hydrothermal synthesis method with anhydrous magnesium chloride as magnesium source, sodium pyrophosphate as phosphorus source and zinc oxide as zinc source. Then, ZnO doped MgHPO • 0.78H,0 radiative cooling coating was prepared with polyvinyl alcohoKPV A) as film forming agent. The daytime radiative cooling performance of the coating was studied. The results indicate that Mg: P: ZnO powder with molar ratio of 1 5 1: 0.5 powder has a high reflectance of 93% in the solar spectral region of 0.3-2.5/im and a high emissivity of 0.91 in the atmospheric window of 8-13/. tm. Compared with the undoped ZnO powder, the solar spectral (0.3-2.5/im) and near-infrared reflectivity (0.76-2.5/im) are increased by 3% and 7% respectively. In the high humidity area, 0.5-ZnO coating could achieves a daytime radiative cooling of 3 °C below the ambient air temperature, providing valuable references for its application of radiative cooling coating in the high humidity area. [ABSTRACT FROM AUTHOR]

In this paper, the formation of oxygen vacancy in the Al2O3 support was induced by urea doping. Through metal-support interaction, the dispersion of Ru-based active species on the surface of the Al2O3 support was improved. The electronic properties of Ru-based active centers was regulated, and then the catalytic performance of the Ru-based catalyst for Sabatier reaction was effectively improved. In this process, it was verified by nuclear magnetic resonance spectroscopy Al-NMR) that urea doping can effectively induce the formation of oxygen vacancy in the Al2O3 support. Transmission electron microscopy (TEM) showed that, the loaded Ru particles could be stabilized at about 3.7 nm on the surface of the Al2O3 support rich in oxygen vacancy, and the distribution of particle size was concentrated. By X-ray photoelectron spectroscopy (XPS) and H2 programmed temperature reduction (H2-TPR), it was found that the oxygen vacancy from the Al2O3 support can effectively regulate the electronic property of the Ru-based active sites. Sabatier reaction performance test showed that under the reaction condition of 300 °C, nco2 : = 1 : 4 and 6000 mL/(g • h), the conversion rate of CO2 could be reached at 61.25% and the selectivity of CH4 could be reached at 92.31 %. Moreover, the catalytic performance did not decrease within 20 hours of the reaction time. [ABSTRACT FROM AUTHOR]

In this paper, stannous oxide (SnO) was synthesized by hydrothermal method, and then the obtained SnO was introduced into polyimide matrix by in-situ polymerization method to prepare SnO/PT composite films. The contents of SnO have significant influence on the dielectric constant, dielectric loss, tensile strength and breakdown strength of the film. When the contents of SnO was 1 Owt%, the dielectric constant of the SnO/PT composite film was as high as 456, the dielectric loss was only 0.034, the tensile strength was 65 MPa, and the breakdown strength was 146.9 MV/m, respectively. The introduction of SnO into PT could greatly improve the dielectric properties of the composite PT films, so that it has a good application prospect in energy storage, aerospace, insulation and other fields. [ABSTRACT FROM AUTHOR]

In order to solve the problem of metal-organic framework MTL-100(Fe) powder which was difficult to be recycled and reused in industrial applications, this paper synthesized MTL-1 OO(Fe) powder by a hydrothermal method. The MTL-1 00(Fe)©porous ceramic composites were prepared by loading the powder on alumina porous ceramic using vacuum filtration method. The structure and properties of the MTL-1 00(Fe) and composites were characterized by using field emission scanning electron microscope-energy spectrometer (FE-SEM-ET)S), X-ray diffractometer (XRD), specific surface area analyzer (BET), and ultraviolet-visible spectrophotometer (UV-VTS). The photo-Fenton-degradation abilities in the H2O2 reaction system were investigated by simulating the dye wastewater with rhodamine B (RhB) solution. Results showed that the MTL-1 OO(Fe) presented an octahedral structure with a specific surface area as high as 1 152.75 m²/g. When the reaction temperature was 60 °C, the initial concentration of was 0.5 g/L and the initial concentration of RhB solution was 20 mg/L the degradation rate of RhB solution reached 99.26%. When the MTL-100(Fe)@porous ceramic composites were recycled for 5 times, the degradation rate of RhB solution still reached more than 98%. The composites present excellent recyclability and had promising for commercialization application. [ABSTRACT FROM AUTHOR]

Perovskite oxides have become one of the most popular materials for electrolytic water anode catalysts because of their relatively high OER catalytic activity. In this paper, LaCuO3 perovskite oxide was synthesized by sol-gel method, and the catalytic activity of the electrocatalyst was improved by doping of Co and Ni elements. Through X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) characterization, as well as electrochemical tests and analyses, such as steady state polarisation (LSV), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (ETS), it was found that the overpotential of LaCu0.8Ni0.2O3 was as low as 285 mV at 1 0 niA/cm², and it possessed a better catalytic activity of OER. This is because the ionic radius of Ni element is greater than that of Cu element, which increases the reactive active site of the catalyst, thereby improving its catalytic activity. [ABSTRACT FROM AUTHOR]

In this paper. Cr/Cr-WC/WC-H/ta-C:H multi-gradient coating was deposited on the Crl 2MoV substrate. The microstructure of the multi-gradient diamond like carbon (T)LC) coating was characterized by scanning electron microscopy (SEM), Raman spectrometry, and X-ray photoelectron spectroscopy (XIãS). The mechanical properties of coating were investigated by using nanoindentation tester, nano-scratch tester, and ball- and-disc tribometer. The results show that compared with the Crl 2MoV without deposited coating, the friction coefficient of Cr/Cr WC/WC-H/1a-C: H multi gradient coating is about 10%, as low as 0.01 9. The hardness of Cr/Cr WC/WC-H/ta-C:H (DLC) coating can reach up to 24.1 GPa, with a high adhesion of 62 N. A new multi-layer gradient coating was designed, which introduces a high lubricity amorphous carbon and hard supported WC layer. Tt suppresses crack propagation, and significantly improves the mechanical properties of Crl 2Mo V. In addition, electrochemical corrosion tests showed that the Cr/Cr-WC/WC-H/1a-C: H multi-gradient coatings had superior corrosion resistance in 3.5% NaCl solution. [ABSTRACT FROM AUTHOR]