70 results on '"Dai, Kai"'
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2. Two-Dimensional High-Entropy Selenides for Boosting Visible-Light-Driven Photocatalytic Performance
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Wang, Jing, Wang, Zhongliao, Zhang, Jinfeng, Mamatkulov, Shavkat, Dai, Kai, Ruzimuradov, Olim, and Low, Jingxiang
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High-entropy materials (HEMs) have garnered extensive attention owing to their diverse and captivating physicochemical properties. Yet, fine-tuning morphological properties of HEMs remains a formidable challenge, constraining their potential applications. To address this, we present a rapid, low-energy consumption diethylenetriamine (DETA)-assisted microwave hydrothermal method for synthesizing a series of two-dimensional high-entropy selenides (HESes). Subsequently, the obtained HESes are harnessed for photocatalytic water splitting. Noteworthy is the optimized HESes, Cd0.9Zn1.2Mn0.4Cu1.8Cr1.2Se4.5, showcasing an output rate of hydrogen of 16.08 mmol h–1g–1and a quantum efficiency of ca. 30% under 420 nm monochromatic LED irradiation. It is revealed that the photocatalytic performance of these HESes stems not only from the enlarged specific surface area and enhanced photogenerated charge carrier utilization efficiency but also from the promoted formation of the Cd–Hadsbond, influenced by multiple principal elements on the Cd. These findings provide a guide for the design of HEMs tailored for various applications.
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- 2024
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3. Amphiphilic cytokine traps remodel marrow adipose tissue for hematopoietic microenvironment amelioration
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Deng, Shunshu, Zhang, Shuang, Shen, Tong, Wang, Xuanlin, Gao, Zehua, Zhang, Wenchao, Dai, Kai, Wang, Jing, and Liu, Changsheng
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Hematopoietic stem cell transplantation (HSCT) is extensively employed in the treatment of hematological malignancies but is markedly constrained by the paucity of hematopoietic stem/progenitor cells (HSPCs). Recent studies have found that marrow adipose tissue (MAT) acts on hematopoiesis through complicated mechanisms. Therefore, the osteo-organoids fabricated in vivousing biomaterials loaded with recombinant human bone morphogenetic protein 2 (rhBMP-2) have been used as models of MAT for our research. To obtain sufficient amounts of therapeutic HSPCs and healthy MAT, we have developed amphiphilic chitosan (AC)-gelatin as carriers of rhBMP-2 to the regulate type conversion of adipose tissue and trap hematopoietic growth factors. Unlike medicine interventions or cell therapies, the traps based on AC not only attenuate the occupancy of adipocytes within the hematopoietic microenvironment while preserving stem cell factor concentrations, but also improve marrow metabolism by promoting MAT browning. In conclusion, this approach increases the proportion of HSPCs in osteo-organoids, and optimizes the composition and metabolic status of MAT. These findings furnish an experimental basis for regulating hematopoiesis in vivothrough materials that promote the development of autologous HSPCs. Additionally, this approach presents a theoretical model of rapid adipogenesis for the study of adipose-related pathologies and potential pharmacological targets.
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- 2024
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4. One-step synthesis of seamlessly contacted non-precious metal cocatalyst modified CdS hollow nanoflowers spheres for photocatalytic hydrogen production.
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Zhang, Haibo, Shao, Chunfeng, Wang, Zhongliao, Zhang, Jinfeng, and Dai, Kai
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HYDROGEN production ,SPHERES ,INTERSTITIAL hydrogen generation ,OPTICAL reflection ,CHARGE exchange ,METALS ,SILVER - Abstract
• CdS/NiS HNS is obtained by one-step method. • A seamless interfacial contact are constructed between CdS and NiS. • The photocatalytic performance of CdS/NiS HNS is dramatically improved. • DFT calculations reveal the role of non-precious metal NiS modification. This study ingeniously synthesized a novel CdS/NiS hollow nanoflower sphere (HNS) using a one-step method to enhance photocatalytic hydrogen production activity. Compared to conventional preparation methods, this approach features seamlessly interfaced contact that facilitates efficient electron transfer across the interface. The internal hollow structure allows for multiple light reflections, maximizing light absorption, while the exterior shell and inner surfaces simultaneously offer active sites for reactions. The modification with non-noble metal NiS enables the extraction of electrons from CdS to the NiS surface, achieving rapid charge separation. Furthermore, adsorption-free energy calculations reveal that the NiS surface is more conducive to photocatalytic hydrogen generation, providing additional reaction active sites. The results demonstrate a hydrogen production rate of 2.18 mmol g
–1 h–1 for CdS/NiS HNS, which is 9.48 times greater than that of pristine CdS. This work presents a novel approach for synthesizing seamlessly interfaced contacts between photocatalysts and cocatalysts, offering new insight into efficient one-step synthesis for enhanced photocatalytic performance. [Display omitted] [ABSTRACT FROM AUTHOR]- Published
- 2024
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5. Background-Free and Reversible Upconversion Hydrogel Sensing Platform for Visual Monitoring of Sulfite.
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Zhu, Jiawei, Yu, Hao, Chang, Caidie, Liang, Boyi, Li, Qiang, Dai, Kai, and Jiang, Changlong
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- 2024
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6. Ipolymer Cd3(C3N3S3)2/Zn3(C3N3S3)2S-scheme heterojunction enhances photocatalytic H2production
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Yang, Tingting, Wang, Jing, Wang, Zhongliao, Zhang, Jinfeng, and Dai, Kai
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The preparation of S-scheme heterojunctions has attracted considerable attention in the academic community as a highly effective approach to enhance the separation and migration of electrons and holes, thereby significantly improving the catalytic efficiency of photocatalysts. In this work, a novel S-scheme ipolymer heterojunction photocatalyst, Cd3(C3N3S3)2/Zn3(C3N3S3)2(CdTMT/ZnTMT), which synergy with π-conjugate system, was synthesized using an innovative in-situ hydrothermal method. Through a series of rigorous characterization tests, the formation of an S-scheme heterojunction between CdTMT and ZnTMT was confirmed. Particular emphasis is placed on the effective enhancement of photocatalytic activity of photocatalysts through π-conjugated orbitals and built-in electric field after combining double-organic conjugated polymer-shaped ZnTMT and CdTMT. Performance tests that show the photocatalytic hydrogen evolution performance of the composite was significantly boosted to an impressive 45.24 mmol∙g−1∙h−1, which is 215.43 times that of single catalyst ZnTMT and 1.76 times that of CdTMT. Finally, this paper discusses the possibility and development prospect of double polymer to construct S-scheme heterojunctions to improve the activity of photocatalysts.
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- 2024
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7. Analysis of the relationship between drug susceptibility of Cryptococcus neoformansisolates and mortality in HIV-negative cryptococcal meningitis
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Su, Zhihui, Wei, Hang, Liu, Jia, Li, Chongwen, Xu, Zirong, Yuan, Dasen, Dai, Kai, Peng, Fuhua, and Jiang, Ying
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The relationship between antifungal susceptibility and mortality of cryptococcal meningitis (CM) in HIV-negative patients is poorly understood.
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- 2024
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8. Background-Free and Reversible Upconversion Hydrogel Sensing Platform for Visual Monitoring of Sulfite
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Zhu, Jiawei, Yu, Hao, Chang, Caidie, Liang, Boyi, Li, Qiang, Dai, Kai, and Jiang, Changlong
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Excessive sulfite usage in food and pharmaceutical production causes respiratory and neurological diseases, underscoring the need for a sensitive and rapid quantification strategy. The portable sensing platform based on a luminescent hydrogel sensor is a powerful tool for the on-site, real-time detection of sulfite ions. However, the lack of recyclability in almost all reaction-based hydrogel sensors increases the application cost. This study constructed a reversible and upconversion nanoprobe combining upconversion nanoparticles (UCNPs) and pararosaniline (PAR) for sulfite detection. The upconversion nanoprobe was further encapsulated in a three-dimensional polyacrylamide hydrogel matrix to create a background-free, reversible hydrogel sensor. The near-infrared excitation of UCNPs avoids the autofluorescence in the hydrogel and real samples. Meanwhile, PAR serves as a specific recognition unit for sulfite ions. After the addition of sulfites, a specific reaction occurs between PAR and sulfites, leading to the recovery of characteristic emission at 540 nm, achieving sensitive detection of sulfite ions. Importantly, this specific reaction is reversible under thermal treatment, allowing the hydrogel sensor to return to its initial state and thus enabling reversible detection of sulfite ions. Furthermore, a portable sensing platform is developed to realize point-of-care, real-time quantitative detection of sulfite ions. The proposed upconversion reversible hydrogel sensor provides a new sensing strategy for the detection of hazardous substances in food and offers new insights into the preparation of reversible, highly sensitive hydrogel sensors.
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- 2024
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9. In2O3/Bi19Br3S27S-scheme heterojunction with enhanced photocatalytic CO2reduction
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Bian, Yuqin, He, Houwei, Dawson, Graham, Zhang, Jinfeng, and Dai, Kai
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In recent years, semiconductor catalysts have attracted lots of attention due to their substantial redox capability and adequate stability. However, many semiconductor catalysts have difficulties in realizing real word applications because of the high complexation and low oxidizing ability of photogenerated electron-holes. In-depth investigation has revealed that the S-scheme heterojunction possesses a unique mechanism of carrier movement, resulting in a robust redox capacity and strong driving force. Herein, we synthesized an In2O3/Bi19Br3S27step-scheme (S-scheme) heterojunction through the hydrothermal method comprised of Bi19Br3S27nanoflowers grown on In2O3nanospheres. This configuration effectively facilitates the separation and transfer of photogenerated charge carriers. As a result, the reduction yield of CO2by In2O3/Bi19Br3S27composite reaches 28.36 µmol h−1g−1, which is 19 times higher than that of In2O3and 3.5 times higher than that of Bi19Br3S27. Furthermore, the intermediates involved in the photocatalytic reaction were examined through in situdiffuse reflectance infrared Fourier transform spectroscopy, revealing the reaction process of photocatalytic reduction of CO2. This work offers a concept on the method of constructing S-scheme heterojunction photocatalysts to enhance the catalyzed reduction of CO2.
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- 2024
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10. Vibration isolation of nonlinear honeycomb sandwich beams
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Chen, Hong-Yan, Dai, Kai-Long, Wang, Chen-Xian, Tan, Xia, and Li, Wei
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Honeycomb sandwich beams are one of the most basic engineering structures and are highly susceptible to external excitation, which may cause amplified vibration phenomena. In response to this concern, support boundary measures with superior elastic properties are implemented to effectively mitigate transverse vibration interference. This paper explores the influence of beam geometry nonlinearity on structural vibration and introduces the concept of vibration transferability. The multi-mode resonant frequency of the elastic support boundary beam is analyzed. The significant impact of support stiffness symmetry on vibration response has been explored. Use approximate analytical methods and numerical calculation methods to mutually verify the research results. Observe how different parameters affect the steady-state response. The transmission law of multi-mode resonance response on elastic sandwich beams is analyzed. Compared with the vibration transmission properties of rigid boundaries, it has been confirmed that elastic supported boundaries have significant advantages in vibration isolation performance. Compared to amplitude, vibration transferability can more accurately depict vibration characteristics in high-order resonance states. This article will further explore the isolation performance of honeycomb sandwich beams and objectively reflect their isolation effect through the vibration transmission rate, thus helping to improve the overall seismic performance of engineering structures.
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- 2024
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11. Ethyl-activated carbon nitride for efficient photocatalytic CO2conversion
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Chen, Dongdong, Wang, Zhongliao, Fu, Junwei, Zhang, Jinfeng, and Dai, Kai
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Surface functional groups of photocatalysts play a key role in the transfer of photogenerated carriers and the active site of the reaction, which severely influence the photocatalytic conversion process. Therefore, reasonable and accurate regulation of surface groups can greatly optimize photocatalytic performance. Herein, we performed optimization on the unpolymerized NH2group of carbon nitride (g-C3N4) by introducing an ethyl group with a strong electron-donating ability to obtain the E-CN photocatalysts. X-ray photoelectron spectroscopy confirmed the successful embedding of the ethyl group. Time-resolved spectroscopy and density function theory calculations verified that the photogenerated carrier changes in a favorable direction. Finally, the Gibbs free energy showed that E-CN significantly decreases the energy barrier of CO2conversion to *COOH. The results revealed that the conversion rate of CO2to CO is 47.08 µmol g−1h−1. This work offers a reliable reference to improve the performance of photocatalysts by optimizing their surface functional groups.
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- 2024
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12. Review on inorganic–organic S-scheme photocatalysts.
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Wang, Jing, Wang, Zhongliao, Dai, Kai, and Zhang, Jinfeng
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HETEROJUNCTIONS ,ORGANIC semiconductors ,CARBON dioxide reduction ,PHOTOCATALYSTS ,ORGANIC synthesis ,NITROGEN fixation ,PHOTOREDUCTION ,HYDROGEN production - Abstract
• A review focuses on the concept and advantages of inorganic–organic S-scheme heterojunction photocatalysts. • Current research on the design and synthesis of inorganic–organic S-scheme heterojunction photocatalysts. • Advanced characterization techniques for inorganic–organic S-scheme heterojunctions are focused. • The proposed inorganic–organic S-scheme heterojunction electron-transfer mechanism is favored. The inorganic–organic S-scheme heterojunction photocatalyst demonstrates exceptional light absorption capacity, high photogenerated charge separation efficiency, and remarkable redox ability, while also inheriting diverse advantages of both inorganic and organic semiconductors. This paper provides a comprehensive review of recent advances in photocatalysis in relation to the inorganic–organic S-scheme heterojunction photocatalyst. Firstly, the fundamental aspects and benefits of the S-scheme heterojunction photocatalyst are outlined, followed by a discussion of several synthetic techniques for producing the inorganic–organic S-scheme heterojunction photocatalyst, as well as various advanced characterization methods that can verify the S-scheme heterojunction photocatalyst in both steady-state and transient processes. The impact of the inorganic–organic S-scheme heterojunction photocatalyst is illustrated with examples in fields such as carbon dioxide reduction, water splitting for hydrogen production, hydrogen peroxide synthesis, nitrogen fixation, organic pollutant degradation, organic transformation, and sterilization. Finally, suggestions are presented for designing the inorganic–organic S-scheme heterojunction photocatalyst and enhancing its photocatalytic performance. Undoubtedly, the inorganic–organic S-scheme heterojunction photocatalyst has emerged as a prominent and promising technology in the field of photocatalysis. [Display omitted] [ABSTRACT FROM AUTHOR]
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- 2023
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13. Anisotropic Phonon Behavior and Phase Transition in Monolayer ReSe2 Discovered by High Pressure Raman Scattering.
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Yan, Yuting, Chen, Liyuan, Dai, Kai, Li, Yafang, Wang, Lin, Jiang, Kai, Cui, Anyang, Zhang, Jinzhong, and Hu, Zhigao
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- 2023
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14. Editorial: special topic on heterojunction in photocatalysts
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Yu, Jiaguo, Li, Xin, Fu, Junwei, and Dai, Kai
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- 2024
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15. A hierarchical Bi-MOF-derived BiOBr/Mn0.2Cd0.8S S-scheme for visible-light-driven photocatalytic CO2 reduction.
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Hua, Jiahui, Wang, Zhongliao, Zhang, Jinfeng, Dai, Kai, Shao, Chunfeng, and Fan, Ke
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PHOTOREDUCTION ,CARBON dioxide ,CHARGE transfer ,ADSORPTION capacity ,HETEROJUNCTIONS ,ELECTRIC fields - Abstract
S-scheme heterojunctions have promising applications in photocatalytic CO 2 reduction due to their unique structure and interfacial interactions, but improving their carrier separation efficiency and CO 2 adsorption capacity remains a challenge. In this work, highly dispersed MOF-BiOBr/Mn 0.2 Cd 0.8 S (MOF-BiOBr/MCS) S-scheme heterojunctions with high photocatalytic CO 2 reduction performance were constructed. The intimate contact between the MCS nano-spheres and the nanosheet-assembled MOF-BiOBr rods, driven by the internal electric field, accelerates the charge transfer along the S-scheme pathway. Moreover, the high specific surface area of MOFs is preserved to provide abundant active sites for reaction/adsorption. The formation of MOF-BiOBr/MCS S-scheme heterojunction is confirmed by theoretical calculations. The optimum MOF-BiOBr/MCS shows excellent activity in CO 2 reduction, affording a high CO evolution rate of 60.59 µmol h
−1 g−1 . The present work can inspire the exploration for the construction of effective heterostructure photocatalysts for photoreduction CO 2. [ABSTRACT FROM AUTHOR]- Published
- 2023
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16. Neurological worsening during treatment of HIV-negative cryptococcal meningitis in a patient with Evans syndrome
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Qin, Bang-e, Yuan, Dasen, Xu, Xiao-feng, Su, Zhihui, Gu, Meifeng, Dai, Kai, Peng, Fu-hua, and Jiang, Ying
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A 49-year-old woman with a rare autoimmune hematological disease, Evans syndrome, was admitted to the authors' hospital with immune reconstitution inflammatory syndrome-like reconstitution syndrome after effective antifungal therapy for cryptococcal meningitis. She initially improved after receiving corticosteroid treatment; after prednisone was tapered, her clinical presentation and brain imaging deteriorated but finally improved with the addition of thalidomide. Immune reconstitution inflammatory syndrome-like reconstitution syndrome is a rare complication in cryptococcal meningitis patients receiving immunosuppressive therapy. Thalidomide can be given in addition to corticosteroid therapy to effectively control the paradoxical inflammatory response and improve clinical outcomes.
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- 2023
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17. Metal-sulfide-based heterojunction photocatalysts: Principles, impact, applications, and in-situcharacterization
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Zhang, Haibo, Wang, Zhongliao, Zhang, Jinfeng, and Dai, Kai
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Semiconductor photocatalysis is a new sustainable development technology that has demonstrated remarkable potential in the fields of energy-production and environmental-protection. However, a single photocatalyst usually does not possess both strong redox and fast charge-separation properties, greatly limiting photocatalysis efficiency. Heterojunction photocatalysts can perfectly solve this problem by providing multiple reactive sites and fast charge separation and migration, elevating photocatalytic efficiency to a new higher level. Metal sulfides are a family of compounds composed of metals and sulfur (e.g., CdS, CuS, MoS2, In2S3, ZnIn2S4, and ZnxCd1–xS) that are preferred choices for heterojunction photocatalysts due to their narrow bandgaps, broad visible-light absorption ranges, and convenient preparation methods. This review article introduces the characteristics of metal sulfides, summarizes methods for their synthesis, and discusses various types of metal-sulfide-based heterojunctions. The use of such photocatalysts in energy and environmental-remediation applications is subsequently discussed. In addition, the roles of charge separation and transfer in heterojunction photocatalysts are demonstrated using in-situcharacterization techniques. Finally, we discuss some application prospects and challenges concerning metal-sulfide-based heterojunction photocatalysts.
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- 2023
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18. LSPR-enhanced carbon-coated In2O3/W18O49S-scheme heterojunction for efficient CO2photoreduction
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He, Houwei, Wang, Zhongliao, Dai, Kai, Li, Suwen, and Zhang, Jinfeng
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The special defect structure and localized surface plasmon resonance (LSPR) effect offer W18O49extraordinary potential and research value in photocatalysis. The LSPR effect optimizes the design of W18O49-sensitized photocatalytic composites and broadens the light-response range of W18O49. However, the high-energy “hot electrons” generated by W18O49under the LSPR effect exhibit an extremely short lifetime and cannot be fully utilized. Therefore, the high electron conductivity of carbon can be used to increase the rate of hot-electron transfer, thereby extending the lifetime of hot electrons. In this study, a heterojunction photocatalyst was formed by growing a high-absorbance one-dimensional nanowire W18O49on the surface of carbon-coated porous In2O3nanorods (C-In2O3) derived from In-MOF. The C-In2O3/W18O49composites exhibited optical responses in both the visible and near-infrared regions. The carbon coatings acted as transport channels to accelerate the transfer of carriers and hot electrons, and the activity of photocatalytic CO2reduction (PCR) was significantly enhanced. The 40%C-In2O3/W18O49composites had the highest CO yield in the photocatalytic reactions, which was 2.99 and 2.84 times greater than that of pure C-In2O3and W18O49, respectively. The internal electronic transfer in the S-scheme heterojunction and LSPR-induced hot electrons injected into C-In2O3achieved dual-path electron transfer for PCR.
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- 2023
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19. Pressure- and Temperature-Induced Structural Phase Diagram of Lead-Free (K0.5Na0.5)NbO3–0.05LiNbO3 Single Crystals: Raman Scattering and Infrared Study.
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Yan, Yuting, Cui, Anyang, Dai, Kai, Ye, Yan, Jiang, Kai, Zhang, Jinzhong, Feng, Jiajia, Dong, Hongliang, and Hu, Zhigao
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- 2022
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20. Pressure- and Temperature-Induced Structural Phase Diagram of Lead-Free (K0.5Na0.5)NbO3–0.05LiNbO3Single Crystals: Raman Scattering and Infrared Study
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Yan, Yuting, Cui, Anyang, Dai, Kai, Ye, Yan, Jiang, Kai, Zhang, Jinzhong, Feng, Jiajia, Dong, Hongliang, and Hu, Zhigao
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Ferroelectric lead-free KxNa1–xNbO3(KNN) perovskite, whose piezoelectric properties can be comparable to those of traditional Pb-based systems, has aroused wide concern in recent years. However, the specific influences of the stress field on KNN’s structure and piezoelectric properties have not been well clarified and there are few descriptions about the temperature–pressure phase diagram. Here, we analyzed the phonon mode behavior and structural evolution of K0.5Na0.5NbO3-0.05LiNbO3(KNN-LN) and MnO2-doped single crystals with pressure- and temperature-dependent phase structure variations by theoretical calculation, polarized Raman scattering, and infrared reflectance spectra. The different phase structures can be predicted at high pressure using the CALYPSO method with its same-name code. The rhombohedral → orthorhombic → tetragonal → cubic phase transition process can be discovered in detail by Raman spectra under different temperatures and pressures. The phase coexistence on the thermal phase boundary was confirmed by basic anastomosis. Meanwhile, it was found that the substitution of Mn in the NbO6octahedron aggravates the deformation of high pressure on KNN-LN and the substitution of Mn at the B-site intensifies the structural evolution more severely than at the A-site. The present study aims at exploring octahedra tilt, phonon vibrations, and the internal structure on the general critical phase boundary in KNN-LN crystals. It provides effective help for the study of lead-free perovskite phase transformation and the improvement in piezoelectric properties under a high-pressure field.
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- 2022
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21. The discrimination between autoimmune glial fibrillary acidic protein astrocytopathy and tuberculous meningitis.
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Chen, Yanxiang, Luo, Chongliang, Zhou, Guonan, Wang, Hui, Dai, Kai, Wu, Weijuan, Wang, Siguang, Su, Zhihui, Peng, Fuhua, and Jiang, Ying
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• Urinary retention was more frequent in AGFAPA-TBM patients. • A significantly lower ratio of T-SPOT. TB was noted in AGFAPA-TBM patients. • The LCSS was able to distinguish AGFAPA-TBM from TBM. • We provide a new scoring system to differentiate AGFAPA-TBM from TBM. The differential diagnosis between autoimmune glial fibrillary acidic protein astrocytopathy (AGFAPA) mimicking tuberculous meningitis and tuberculous meningitis (TBM) remains challenging in clinical practice. This study aims to identify the clinical, laboratory parameters, and clinical score systems that may be helpful in differentiating AGFAPA from TBM. Overall 22 AGFAPA patients who were initially misdiagnosed as TBM (AGFAPA-TBM) and 30 confirmed TBM patients were included. The clinical, laboratory, imaging parameters, Thwaites systems, and Lancet consensus scoring systems (LCSS) of all patients were reviewed. Logistic regression was employed to establish a diagnostic formula to differentiate AGFAPA-TBM from TBM. The receiver operating characteristic (ROC) curve was applied to determine the best diagnostic critical point of the formula. Urinary retention was more frequent in AGFAPA-TBM patients (72.7% vs 33.3%, p = 0.012). A significantly lower ratio of T-SPOT. TB was noted in AGFAPA-TBM patients (9.1% vs 82.1%, p < 0.001). We found the LCSS was able to differentiate AGFAPA-TBM from TBM (AUC value 0.918, 95% CI=0.897–0.924). Furthermore, we set up a new scoring system with three variables: urinary retention, T-SPOT. TB, and cerebral imaging criteria in LCSS. The proposed diagnostic score ranges from -8 to 2, and a score of ≥ 0 was suggestive of AGFAPA-TBM (AUC value 0.938, 95% CI=0.878–0.951). This study is the first to evaluate the Thwaites system and LCSS in AGFAPA-TBM and TBM. We provide an alternative diagnostic formula to differentiate AGFAPA-TBM from TBM and suggest testing for GFAP antibodies to avoid misdiagnosis when this scoring system meets AGFAPA-TBM. [ABSTRACT FROM AUTHOR]
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- 2024
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22. Corrigendum to "A2aR inhibits fibrosis and the EMT process in silicosis by regulating Wnt/β-catenin pathway" [Ecotoxicol. Environ. Saf. 249 (2023) 114410].
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Tian, Yangyang, Xia, Jiarui, Yang, Guo, Li, Chao, Qi, Yuanmeng, Dai, Kai, Wu, Chenchen, Guo, Yonghua, Yao, Wu, and Hao, Changfu
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SILICOSIS ,FIBROSIS - Published
- 2024
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23. Engineering Neutrophil Immunomodulatory Hydrogels Promoted Angiogenesis
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Gao, Zehua, Yu, Yuanman, Dai, Kai, Zhang, Tingting, Ji, Luli, Wang, Xuanlin, Wang, Jing, and Liu, Changsheng
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Timely restoration of blood supply following ischemia is critical to rescue damaged tissue. However, clinical efficacy is hampered by the inflammatory response after ischemia. Whether inflammation fine tunes the angiogenesis and the function of blood vessels via the heterogeneity of neutrophils remain poorly understood. Herein, the objective of this work is to incorporate the growth factors secreted by neutrophils into a porous gelatin methacrylate (GelMA) hydrogel, which subsequently is used as a novel regenerative scaffold with defined architecture for ischemia. We demonstrate that anti-inflammatory neutrophils (N2-polarized neutrophils) play an important role in promoting the migration of human umbilical vein endothelial cells (HUVECs) and formation of capillary-like networks in vitro. More importantly, vascular anastomosis can be achieved by modulating the neutrophils to N2phenotype. In addition, N2-polarized composite hydrogel scaffolds can regulate inflammation, maintain the survival of exogenous cells, and promote angiogenesis in vivo. Notably, the composite hydrogel scaffolds promote neovascularization during exogenous introduction of endothelial cells by anastomosis. Taken together, this study highlights N2-polarized neutrophils composite hydrogels can achieve vascularization rapidly by regulating inflammation and promoting vascular anastomosis. This work lays the foundation for research into the treatment of ischemia and may inspire further research into novel treatment options.
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- 2022
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24. In-situ fabrication of Bi2S3/BiVO4/Mn0.5Cd0.5S-DETA ternary S-scheme heterostructure with effective interface charge separation and CO2 reduction performance.
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Zhao, Zhiwei, Li, Xiaofeng, Dai, Kai, Zhang, Jinfeng, and Dawson, Graham
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HETEROJUNCTIONS ,CATALYSTS ,PHOTOCATALYSTS ,CARBON dioxide ,CHARGE transfer ,INTERFACE structures - Abstract
• Bi 2 S 3 /BiVO 4 /Mn 0.5 Cd 0.5 S-DETA ternary heterostructure is obtained. • The heterostructure exhibited excellent photocatalytic CO 2 reduction and stability. • Mechanism of charge transfer and separation in S-scheme heterojunction is proposed. • S-scheme photocatalytic mechanism is discussed. Exploring new and efficient photocatalysts to boost photocatalytic CO 2 reduction is of critical importance for solar-to-fuel conversion. In this study, through the in-situ growth method, a series of S-scheme mechanism Bi 2 S 3 /BiVO 4 /Mn 0.5 Cd 0.5 S-DETA nanocomposites with good photocatalytic activity were synthesized. The extremely small size of Mn 0.5 Cd 0.5 S-DETA nanoparticles provides more active sites for photocatalytic reactions. In order to solve the serious shortcomings of sulfide photo-corrosion, BiVO 4 were introduced as oxidation catalyst to consume too many holes and improve the stability of the material. In addition, the in-situ growth method produces the reduction cocatalyst Bi 2 S 3 during the BiVO 4 and Mn 0.5 Cd 0.5 S-DETA recombination process, thereby improving the efficiency of charge transfer at their interface contact. The ternary composite unveils a higher CO 2 -reduction rate (44.74 μmol g
−1 h−1 ) comparing with pristine BiVO 4 (14.11 μmol g−1 h−1 ). The enhanced photocatalytic CO 2 reduction performance is due to the special interface structure of the S-scheme Bi 2 S 3 /BiVO 4 /Mn 0.5 Cd 0.5 S-DETA photocatalyst, which facilitates the charge separation at the interface and improves its photocatalytic activity and stability. [Display omitted]. [ABSTRACT FROM AUTHOR]- Published
- 2022
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25. Graphitic carbon nitride/antimonene van der Waals heterostructure with enhanced photocatalytic CO2 reduction activity.
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Zhang, Jinfeng, Fu, Junwei, and Dai, Kai
- Subjects
NITRIDES ,HETEROJUNCTIONS ,PHOTOREDUCTION ,CARBON dioxide ,FOURIER transform infrared spectroscopy ,DENSITY functional theory ,CHARGE carrier mobility - Abstract
Photocatalytic reduction of CO 2 into valuable fuels is one of the potential strategies to solve the carbon cycle and energy crisis. Graphitic carbon nitride (g-C 3 N 4), as a typical two-dimensional (2D) semiconductor with a bandgap of ∼2.7 eV, has attracted wide attention in photocatalytic CO 2 reduction. However, the performance of g-C 3 N 4 is greatly limited by the rapid recombination of photogenerated charge carriers and weak CO 2 activation capacity. Construction of van der Waals heterostructure with the maximum interface contact area can improve the transfer/seperation efficiency of interface charge carriers. Ultrathin metal antimony (Sb) nanosheet (antimonene) with high carrier mobility and 2D layered structure, is a good candidate material to construct 2D/2D Sb/g-C 3 N 4 van der Waals heterostructure. In this work, the density functional theory (DFT) calculations indicated that antimonene has higher carrier mobility than g-C 3 N 4 nanosheets. Obvious charge transfer and in-plane structure distortion will occur at the interface of Sb/g-C 3 N 4 , which endow stronger CO 2 activation ability on di-coordinated N active site. The ultrathin g-C 3 N 4 and antimonene nanosheets were prepared by ultrasonic exfoliation method, and Sb/g-C 3 N 4 van der Waals heterostructures were constructed by self-assembly process. The photoluminescence (PL) and time-resolved photoluminescence (TRPL) indicated that the Sb/g-C 3 N 4 van der Waals heterostructures have a better photogenerated charge separation efficiency than pure g-C 3 N 4 nanosheets. In-situ FTIR spectroscopy demonstrated a stronger ability of CO 2 activation to *COOH on Sb/g-C 3 N 4 van der Waals heterostructure. As a result, the Sb/g-C 3 N 4 van der Waals heterostructures showed a higher CO yield with 2.03 umol g
−1 h−1 , which is 3.2 times that of pure g-C 3 N 4. This work provides a reference for activating CO 2 and promoting CO 2 reduction by van der Waals heterostructure. [ABSTRACT FROM AUTHOR]- Published
- 2022
- Full Text
- View/download PDF
26. Designing Monoclinic Heterophase Coexistence for the Enhanced Piezoelectric Performance in Ternary Lead-Based Relaxor Ferroelectrics.
- Author
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Cui, Anyang, Ye, Yan, Dai, Kai, Li, Yawei, Zhu, Liangqing, Jiang, Kai, Shang, Liyan, Xu, Guisheng, Hu, Zhigao, Zhang, Shujun, and Chu, Junhao
- Published
- 2022
- Full Text
- View/download PDF
27. Thermal Conductivity of Large-Area Polycrystalline MoSe2 Films Grown by Chemical Vapor Deposition.
- Author
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Sun, Jie, Dai, Kai, Xia, Wei, Chen, Junhui, Jiang, Kai, Li, Yawei, Zhang, Jinzhong, Zhu, Liangqing, Shang, Liyan, Hu, Zhigao, and Chu, Junhao
- Published
- 2021
- Full Text
- View/download PDF
28. S-scheme Porous g-C3N4/Ag2MoO4Heterojunction Composite for CO2Photoreduction
- Author
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Wang, Zhongliao, Liu, Ruilian, Zhang, Jinfeng, and Dai, Kai
- Abstract
Utilizing solar energy to achieve artificial photosynthesis of chemical fuel is prevalent in tackling excessive CO2emission and fossil fuel depletion. Grievous charge recombination and weak redox capability aggravate the CO2photoreduction performance. Engineering tailored morphology and constructing matched heterostructure are two significant schemes to ameliorate the CO2photoconversion efficiency of g-C3N4-based composite. Herein, a novel S-scheme ultrathin porous g-C3N4(UPCN)/Ag2MoO4(AMO) composite was designed by in-situ growing tetragonal α-AMO nanoparticles (NPs) (5–30 nm) on UPCN nanosheets (NSs). The S-scheme charge transfer route endows UPCN/AMO with fast charge separation and strong redox capability, demonstrated by X-ray photoelectron spectroscopy (XPS), photoelectrochemical tests, steady-state and time-resolved photoluminescence (PL) spectra, and DFT calculations. The UPCN/AMO composite exhibits elevated CO2photoreduction performance with CO and CH4yield rates of 6.98 and 0.38 μmol g−1h−1, which are 3.5 and 2.9 folds higher than that of pristine UPCN, respectively. Finally, the CO2photoreduction intermediates are analyzed, and the CO2photoreduction mechanism is discussed. This work provides a reference for various g-C3N4-based composites applied in artificial photosynthesis.
- Published
- 2022
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29. Multiple organ dysfunction due to a rare complication of Nuss procedure for pectus excavatum: A case report.
- Author
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He, Xin-Xin, Dai, Kai, Deng, Qun, and Guo, Jian-Ying
- Abstract
A 19-year-old male patient who suffered from sudden and repeated multiple organ dysfunction syndrome one month after the bar removal procedure of Nuss surgery for pectus excavatum was admitted to our department. With organ function supportive treatment, the etiology was finally identified to be a bone spur located at the inner border of the left costa due to repeated friction between the implanted steel bar and the rib, which damaged the heart repeatedly and induced the consequent acute cardiac tamponade. After operation, the patient was successfully treated and discharged. Follow-ups till three years indicated a good recovery. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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- View/download PDF
30. The discrimination between autoimmune glial fibrillary acidic protein astrocytopathy and tuberculous meningitis
- Author
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Chen, Yanxiang, Luo, Chongliang, Zhou, Guonan, Wang, Hui, Dai, Kai, Wu, Weijuan, Wang, Siguang, Su, Zhihui, Peng, Fuhua, and Jiang, Ying
- Abstract
•Urinary retention was more frequent in AGFAPA-TBM patients.•A significantly lower ratio of T-SPOT. TB was noted in AGFAPA-TBM patients.•The LCSS was able to distinguish AGFAPA-TBM from TBM.•We provide a new scoring system to differentiate AGFAPA-TBM from TBM.
- Published
- 2024
- Full Text
- View/download PDF
31. Designing Monoclinic Heterophase Coexistence for the Enhanced Piezoelectric Performance in Ternary Lead-Based Relaxor Ferroelectrics
- Author
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Cui, Anyang, Ye, Yan, Dai, Kai, Li, Yawei, Zhu, Liangqing, Jiang, Kai, Shang, Liyan, Xu, Guisheng, Hu, Zhigao, Zhang, Shujun, and Chu, Junhao
- Abstract
Enhanced piezoelectric, dielectric properties and thermal stability in ternary relaxor-PbTiO3based ferroelectric crystals are expected to develop the next-generation of electromechanical devices. However, due to their increased disorder compared to other ferroelectrics, designing a controllable phase boundary structure and engineered domain remains a challenging task. Here, we construct a monoclinic heterophase coexisting in a ternary Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3single crystal with optimized composition and an ultrahigh piezoelectric coefficient of 1400 pC N–1, to quantify the correlation between spontaneous nanopolarity and phase heterogeneity, in an attempt to understand the origin of the exceptional functionalities. By designing an in situ high-resolution spectroscopic-microscopic technique, we have observed Maand Mcheterophase mixtures spatially separated by the monoclinic heterophase boundary (MHB), which are responsible for the ferroelectric-dominated and relaxor-ferroelectric-dominated nanodomain structure, respectively. Internal energy mapping from optical soft mode dynamics reveals the inhomogeneous polarization and local symmetry on both sides of the MHB. Various molecular polarizabilities and localized octahedral distortions correlate directly with monoclinic regions and electromechanical contribution. This work clarifies the heterogeneity between structure, energy, and polar order and provides a new design freedom for advanced relaxor ferroelectrics.
- Published
- 2022
- Full Text
- View/download PDF
32. Organic amine surface modified one-dimensional CdSe0.8S0.2-diethylenetriamine/two-dimensional SnNb2O6S-scheme heterojunction with promoted visible-light-driven photocatalytic CO2reduction
- Author
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Yang, Hui, Zhang, Jin feng, and Dai, Kai
- Abstract
Achieving a strong redox ability and high visible-light absorption ability in a single semiconductor material is difficult. Designing a heterojunction between two semiconductor materials is a feasible method. The new step (S-scheme) heterojunction can effectively promote the separation and transfer of photogenerated electron-hole pairs and retain strong redox ability. We designed and prepared a CdSe0.8S0.2-diethylenetriamine (DETA)/SnNb2O6heterostructure material via the solvothermal method. When CdSe0.8S0.2-DETA and SnNb2O6 form an S-scheme heterojunction, 30%CdSe0.8S0.2-DETA/SnNb2O6 exhibits the highest CO production rate (17.31 μmol·g–1·h–1), which is factors of 2.8 and 4.8 higher than that of traditional solvothermal SnNb2O6(6.2 μmol·g–1·h–1) and CdSe0.8S0.2-DETA (3.6 μmol·g–1·h–1), respectively. X-ray photoelectron spectroscopy characterization data provided evidence that the transfer pathway of space charge in the CO2reduction process was in accordance with the S-scheme. This research provides a simple strategy through which one can optimize the band structure to promote the separation of photogenerated carriers and achieve a high efficiency of CO2reduction.
- Published
- 2022
- Full Text
- View/download PDF
33. Photocatalytic CO2conversion of W18O49/CdSe-Diethylenetriamine with high charge transfer efficiency: Synergistic effect of LSPR effect and S-scheme heterojunction
- Author
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Huang, Yue, Dai, Kai, Zhang, Jinfeng, and Dawson, Graham
- Abstract
Non-stoichiometric W18O49(WO) prepared by solvothermal method has excellent NIR absorption due to the localized surface plasmon resonance effect caused by oxygen vacancies. This has great potential in the field of using sunlight to convert carbon dioxide into organic fuels. In addition, through the amination of CdSe, the one-dimensional/two-dimensional step-scheme (S-scheme) WO/CdSe-diethylenetriamine (WO/CdSe-D) photocatalyst with electron transmission channels driven by visible light to NIR light is constructed by microwave solvothermal method. The LSPR of WO and the synergistic effect of coupling semiconductors to construct S-scheme heterojunctions can improve light utilization and achieve efficient charge carrier transfer efficiency. The optimized photocatalyst of 35%WO/CdSe-D has the best CO2reduction performance compared to WO and CdSe-D, and the yield is 25.37 µmol h–1g–1. X-ray photoelectron spectroscopy was used to verify the charge transfer path of the S-scheme WO/CdSe-D heterojunction. This work provides a possibility for the application of non-stoichiometric oxides rich in oxygen vacancies in the field of photocatalytic CO2reduction.
- Published
- 2022
- Full Text
- View/download PDF
34. Copper-Catalyzed Chemoselective Silylative Cyclization of 2,2′-Diethynylbiaryl Derivatives.
- Author
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Zhao, Meng, Wang, Ying, Wang, Zi-Lu, Xu, Jian-Lin, Dai, Kai-Yang, and Xu, Yun-He
- Published
- 2021
- Full Text
- View/download PDF
35. Amine-Modified S‑Scheme Porous g‑C3N4/CdSe–Diethylenetriamine Composite with Enhanced Photocatalytic CO2 Reduction Activity.
- Author
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Huo, Yao, Zhang, Jinfeng, Dai, Kai, and Liang, Changhao
- Published
- 2021
- Full Text
- View/download PDF
36. Sulfated chitosan rescues dysfunctional macrophages and accelerates wound healing in diabetic mice.
- Author
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Shen, Tong, Dai, Kai, Yu, Yuanman, Wang, Jing, and Liu, Changsheng
- Subjects
MACROPHAGES ,WOUND healing ,CHRONIC wounds & injuries ,PEOPLE with diabetes ,TISSUE wounds ,EXTRACELLULAR matrix - Abstract
Emerging evidence suggests that dysfunctional macrophages can cause chronic inflammation and impair tissue regeneration in diabetic wounds. Therefore, improving macrophage behaviors and functions may improve therapeutic outcomes of current treatments in diabetic wounds. Herein, we present a sulfated chitosan (SCS)-doped Collagen type I (Col I/SCS) hydrogel as a candidate for diabetic wound treatments, and assess its efficacy using streptozocin (STZ)-induced diabetic wound model. Results showed that Col I/SCS hydrogel significantly improved wound closure rate, collagen deposition, and revascularization in diabetic wounds. Flow cytometry analysis and immunofluorescent staining analysis showed that the Col I/SCS hydrogel accelerated the resolution of excessive inflammation by reducing the polarization of M1-like macrophages in chronic diabetic wounds. In addition, ELISA analysis revealed that the Col I/SCS hydrogel reduced the production of pro-inflammatory interleukin (IL)-6 and increased the production of anti-inflammatory cytokines including IL-4 and transforming growth factor-beta 1 (TGF-β1) during wound healing. Moreover, the Col I/SCS hydrogel enhanced the transdifferentiation of macrophages into fibroblasts, which enhanced the formation of collagen and the extracellular matrix (ECM) in wound tissue. We highlight a potential application of manipulating macrophages behaviors in the pathological microenvironment via materials strategy. Improving the chronic inflammatory microenvironment of diabetic wounds by regulating macrophage behaviors has been of wide concern in recent years. We designed a Col I/SCS hydrogel based on Collagen type I and sulfated chitosan (SCS) without exogenous cells or cytokines, which could significantly improve angiogenesis and resolve chronic inflammation in diabetic wounds, and hence accelerate diabetic wound healing. The Col I/SCS hydrogel could facilitate the polarization of M1-to-M2 macrophages and activate the transdifferentiation of macrophages to fibroblasts. Additionally, the Col I/SCS hydrogel also equilibrated the content of pro-inflammatory and anti-inflammatory cytokines. This strategy may afford a new avenue to improve macrophage functions and accelerate diabetic chronic wound healing. Image, graphical abstract [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
37. Synthesis of Structurally Diverse Allylsilanes via Copper-Catalyzed Regiodivergent Hydrosilylation of 1,3-Dienes
- Author
-
Wang, Zi-Lu, Wang, Ying, Xu, Jian-Lin, Zhao, Meng, Dai, Kai-Yang, Shan, Cui-Cui, and Xu, Yun-He
- Abstract
Unprecedented copper-catalyzed regiodivergent hydrosilylation reactions of substituted 1,3-dienes with hydrosilanes have been developed. The 1,2- and 1,4-hydrosilylations of 1-(hetero)aryl-substituted 1,3-dienes were highly selectively controlled via variation of the catalytic systems. Meanwhile, the 1,4-hydrosilylation reaction of 2-aryl-substituted 1,3-dienes with diphenylsilane was also successfully realized for the first time. These methods provide convenient and efficient approaches for the synthesis of structurally diverse allylsilanes.
- Published
- 2021
- Full Text
- View/download PDF
38. Copper-Catalyzed Chemoselective Silylative Cyclization of 2,2′-Diethynylbiaryl Derivatives
- Author
-
Zhao, Meng, Wang, Ying, Wang, Zi-Lu, Xu, Jian-Lin, Dai, Kai-Yang, and Xu, Yun-He
- Abstract
In this protocol, copper-catalyzed diverse silylative carbocyclization reactions of 2,2′-diethynylbiaryl derivatives with silaboronate were reported. Three new and novel types of domino reactions for the copper-catalyzed transformation of silaboronate were discovered. The corresponding cyclobuta[l]phenanthrene, bis((silyl)methyl)phenanthrene, and silyl-substituted exocyclic diene products were chemoselectively formed with high efficiency.
- Published
- 2021
- Full Text
- View/download PDF
39. Manganese accumulation in red blood cells as a biomarker of manganese exposure and neurotoxicity
- Author
-
Deng, Xuedan, Guo, Yonghua, Jin, Xiaofei, Si, Huifang, Dai, Kai, Deng, Meng, He, Jing, Hao, Changfu, and Yao, Wu
- Abstract
Although overexposure to manganese (Mn) is known to cause neurotoxic damage, effective exposure markers for assessing Mn loading in Mn-exposed workers are lacking. Here, we construct a Mn-exposed rat model to perform correlation analysis between Mn-induced neurological damage and Mn levels in various biological samples. We combine this analysis with epidemiological investigation to assess whether Mn concentrations in red blood cells (MnRBCs) and urine (MnU) can be used as valid exposure markers. The results show that Mn exposure resulted in neurotoxic damage in rats and that MnRBCs correlated well with neurological damage, showing potential as a novel Mn exposure biomarker. These findings provide a basis for health monitoring of Mn-exposed workers and the development of more appropriate biological exposure limits.
- Published
- 2024
- Full Text
- View/download PDF
40. Advancements in mesenchymal stem cell therapy for liver cirrhosis: Unveiling origins, treatment mechanisms, and current research frontiers.
- Author
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Wang, Zheng, Yao, Lichao, Hu, Xue, Yuan, Mengqin, Chen, Ping, Liu, Pingji, Zhang, Qiuling, Xiong, Zhiyu, Dai, Kai, and Jiang, Yingan
- Subjects
MESENCHYMAL stem cells ,CIRRHOSIS of the liver ,STEM cell treatment ,LIVER cells ,LIFE expectancy ,LIVER diseases - Abstract
Chronic liver disease inevitably progresses to liver cirrhosis, significantly compromising patients' overall survival and quality of life. However, a glimmer of hope emerges with the emergence of mesenchymal stem cells, possessing remarkable abilities for self-renewal, differentiation, and immunomodulation. Leveraging their potential, MSCs have become a focal point in both basic and clinical trials, offering a promising therapeutic avenue to impede fibrosis progression and enhance the life expectancy of individuals battling hepatic cirrhosis. This comprehensive review serves to shed light on the origin of MSCs, the intricate mechanisms underlying cirrhosis treatment, and the cutting-edge advancements in basic and clinical research surrounding MSC-based therapies for liver cirrhosis patients. • Liver cirrhosis is the final stage of many chronic liver diseases. • Mesenchymal stem cells (MSCs) have paracrine, anti-fibrotic, anti-oxidative stress, and immunomodulatory effects, making them a potential treatment option for liver cirrhosis. • MSC-EVs, gene modification, hypoxia, preconditioning with cytokines or growth factors, and combination therapy can enhance the therapeutic effect of MSCs in treating liver cirrhosis. • Clinical trials have proven MSCs' safety and effectiveness in treating liver cirrhosis. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
41. A novel step-scheme BiVO4/Ag3VO4photocatalyst for enhanced photocatalytic degradation activity under visible light irradiation
- Author
-
Liu, Lizhong, Hu, Taiping, Dai, Kai, Zhang, Jinfeng, and Liang, Changhao
- Abstract
Over the past few years, the emission of organic pollutants into the environment has increased tremendously. Therefore, various photocatalysts have been developed for the degradation of organic pollutants. In this study, a step-scheme BiVO4/Ag3VO4composite was synthesized via a hydrothermal and chemical deposition process for the degradation of methylene blue.The composite showed strong redox ability under visible light. The 40%BiVO4/Ag3VO4composite showed excellent photocatalytic degradation properties with a Kappof 0.05588 min−1, which is 22.76 and 1.76 times higher than those of BiVO4(0.00247 min−1) and Ag3VO4(0.03167 min−1), respectively. The composite showed a stable performance and could retain 90% of its photocatalytic activity even after four cycles. The improved catalytic performance of the composite as compared to BiVO4and Ag3VO4can be attributed to its novel step-scheme mechanism, which facilitated the separation of the photogenerated charges and increased their lifetime. The photoluminescence measurement results and transient photocurrent response revealed that the composite showed efficient extraction of charge carriers.
- Published
- 2021
- Full Text
- View/download PDF
42. Step-scheme porous g-C3N4/Zn0.2Cd0.8S-DETA composites for efficient and stable photocatalytic H2production
- Author
-
Mei, Feifei, Li, Zhen, Dai, Kai, Zhang, Jinfeng, and Liang, Changhao
- Abstract
In recent years, environmental pollution and energy crisis have become increasingly serious issues owing to the burning of fossil fuels. Among the many technologies, decomposition of water to produce hydrogen has attracted much attention because of its sustainability and non-polluting characteristic. However, highly efficient decomposition of water that is driven by visible light is still a challenge. Herein, we report the large-scale preparation of step-scheme porous graphite carbon nitride/Zn0.2Cd0.8S-diethylenetriamine (Pg-C3N4/Zn0.2Cd0.8S-DETA) composite by a facile solvothermal method. It was found by UV-vis spectroscopy that 15%Pg-C3N4/Zn0.2Cd0.8S-DETA exhibited suitable visible absorption edge and band gap for water decomposition. The hydrogen production rate of 15%Pg-C3N4/Zn0.2Cd0.8S-DETA composite was 6.69 mmol g−1h−1, which was 16.73, 1.61, and 1.44 times greater than those of Pg-C3N4, CdS-DETA, and Zn0.2Cd0.8S-DETA, respectively. In addition, 15%Pg-C3N4/Zn0.2Cd0.8S-DETA composite displayed excellent photocatalytic stability, which was maintained for seven cycles of photocatalytic water splitting test. We believe that 15%Pg-C3N4/Zn0.2Cd0.8S-DETA composite can be a valuable guide for the development of solar hydrogen production applications in the near future.
- Published
- 2020
- Full Text
- View/download PDF
43. Cellular Automaton Simulation for Degradation of Poly Lactic Acid with Acceleratable Reaction-Diffusion Model.
- Author
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Zhang, Shuang, Chen, Jie, Yu, Yuanman, Dai, Kai, Wang, Jing, and Liu, Changsheng
- Published
- 2019
- Full Text
- View/download PDF
44. Single-layer crystalline triazine-based organic framework photocatalysts with different linking groups for H2O2production
- Author
-
Wang, Jing, Wang, Zhongliao, Zhang, Jinfeng, and Dai, Kai
- Abstract
Harnessing solar energy for photocatalytic hydrogen peroxide (H2O2) synthesis represents a pinnacle of environmentally-sensitive and sustainable methodologies. While single-layer crystalline triazine-based organic frameworks (CTFs) are known for their prodigious photocatalytic potential in H2O2generation, ramifications of the connecting group within the triazine ring (TR) on underlying photocatalytic mechanism warrant deeper exploration. In this study, we simulate three distinct CTFs characterized by different TR linkers: CTF-1 (benzene group (BG)), CTF-2 (horizontally-oriented naphthyl group (NGH)), and CTF-DCN (vertically-oriented naphthyl group (NGV)). These diverse TR linkers profoundly modulate the absorption band edge of CTFs, subsequently dictating the orientation and constitution of the frontier orbitals. Such modulation plays a decisive role in determining the requisite energy for photoexcitation in CTFs, orchestrating the generation and distribution of photo-induced electrons and holes. Remarkably, the NGV linkage imparts CTF-DCN with unparalleled light absorption, superior charge separation efficiency, and the lowest energy barrier for associated reactions. Through this investigation, we illuminate the pivotal influence of TR linkers in sculpting the photocatalytic dynamics of CTFs, providing fresh perspectives for architecting CTFs with amplified photocatalytic prowess in H2O2synthesis.
- Published
- 2023
- Full Text
- View/download PDF
45. Study on Fracture Behavior of the Brazilian Test of PBX Explosives Based on XFEM.
- Author
-
DAI Kai-da, LI Sheng-tao, and CHEN Peng-wan
- Subjects
COMPUTER simulation ,FINITE element method ,TENSILE strength ,STRAINS & stresses (Mechanics) ,TENSILE tests - Abstract
In order to investigate the effects of different loading methods in the Brazilian test on indirect tensile mechanical behavior of PBX explosives, the deformation, damage and failure process in the Brazilian test, the arc Brazilian and the rubber-cushion Brazilian tests were simulated by using extended finite element method(XFEM).The distribution of displacement and stress were obtained. The effects of different loading methods on mechanical response, deformation and fracture were analyzed. The results show that the fracture path and the distribution of displacement and stress agree well with the experimental and analytical values. Compared with the Brazilian test, the arc Brazilian test and the rubber-cushion Brazilian test can reduce contact stress and help to prevent the generation of secondary cracks. It indicates that the rubber-cushion Brazilian test is better for measuring the tensile strength of PBX. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
46. Accelerated Bone Regenerative Efficiency by Regulating Sequential Release of BMP-2 and VEGF and Synergism with Sulfated Chitosan
- Author
-
Zhang, Shuang, Chen, Jie, Yu, Yuanman, Dai, Kai, Wang, Jing, and Liu, Changsheng
- Abstract
Emerging evidence suggests that successful healing of bone substitutes depends on the osteogenesis–angiogenesis interplay. Bone morphogenetic protein-2 (BMP-2) and vascular endothelial growth factor (VEGF) have been identified as key regulators of osteogenesis and angiogenesis during bone regeneration. While the importance of growth factors is now widely accepted, the impact and mechanisms of different releasing sequences on bone repair have not been fully understood. Here, a composite vehicle (Gel/PMs), constructed with hydrogels and microspheres, was developed, which is capable of achieving two distinct releasing modes: BMP-2 first release followed by VEGF release (B/V) and VEGF first release followed by BMP-2 release (V/B). In our results, the B/V mode exhibited more extensive vascular network formation by up-regulating angiogenic genes during the bone remolding, thus facilitating rapid bone transformation which was confirmed by radiography. Further histological and immune-staining analysis revealed that fast release of BMP-2 made for rapidly initiating osteogenesis, while later VEGF release promoted persistent angiogenesis and mature bone formation. Moreover, interest arises from the introduction of 2-N,6-O-sulfated chitosan (SCS), a sulfonated heparin-like polysaccharide. It has synergistic effects with both BMP-2 and VEGF, which can further accelerate bone healing by efficiently improving osteogenesis and angiogenesis. The results demonstrated that disparate releasing sequence of growth factors might influence regenerative efficiency. Such a strategy may provide insights toward designing bioactive materials and give promising application in tissue regeneration.
- Published
- 2019
- Full Text
- View/download PDF
47. Preparation of Z-scheme WO3(H2O)0.333/Ag3PO4composites with enhanced photocatalytic activity and durability
- Author
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Li, Zhen, Wang, Xia, Zhang, Jinfeng, Liang, Changhao, Lu, Luhua, and Dai, Kai
- Abstract
Ag3PO4is widely used in the field of photocatalysis because of its unique activity. However, photocorrosion limits its practical application. Therefore, it is very urgent to find a solution to improve the light corrosion resistance of Ag3PO4. Herein, the Z-scheme WO3(H2O)0.333/Ag3PO4composites are successfully prepared through microwave hydrothermal and simple stirring. The WO3(H2O)0.333/Ag3PO4composites are characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and UV-Vis spectroscopy. In the degradation of organic pollutants, WO3(H2O)0.333/Ag3PO4composites exhibit excellent performance under visible light. This is mainly attributed to the synergy of WO3(H2O)0.333and Ag3PO4. Especially, the photocatalytic activity of 15%WO3(H2O)0.333/Ag3PO4is the highest, and the methylene blue can be completely degraded in 4 min. In addition, the stability of the composites is also greatly enhanced. After five cycles of testing, the photocatalytic activity of 15%WO3(H2O)0.333/Ag3PO4is not obviously decreased. However, the degradation efficiency of Ag3PO4was only 20.2%. This indicates that adding WO3(H2O)0.333can significantly improve the photoetching resistance of Ag3PO4. Finally, Z-scheme photocatalytic mechanism is investigated.
- Published
- 2019
- Full Text
- View/download PDF
48. A2aR inhibits fibrosis and the EMT process in silicosis by regulating Wnt/β-catenin pathway.
- Author
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Tian, Yangyang, Xia, Jiarui, Yang, Guo, Li, Chao, Qi, Yuanmeng, Dai, Kai, Wu, Chenchen, Guo, Yonghua, Yao, Wu, and Hao, Changfu
- Subjects
SILICOSIS ,PULMONARY fibrosis ,FIBROSIS ,OCCUPATIONAL diseases ,EPITHELIAL-mesenchymal transition - Abstract
Silicosis, a disease characterized by diffuse fibrosis of the lung tissue, is caused by long-term inhalation of free silica (SiO 2) dust in the occupational environment and is currently the most serious occupational diseases of pneumoconiosis. Several studies have suggested that alveolar type Ⅱ epithelial cells (AEC Ⅱ) undergo epithelial-mesenchymal transition (EMT) as one of the crucial components of silicosis in lung fibroblasts. A2aR can play a critical regulatory role in fibrosis-related diseases by modulating the Wnt/β-catenin pathway, but its function in the EMT process of silicosis has not been explained. In this study, an EMT model of A549 cells was established. The results revealed that A2aR expression is reduced in the EMT model. Furthermore, activation of A2aR or suppression of the Wnt/β-catenin pathway reversed the EMT process, while the opposite result was obtained by inhibiting A2aR. In addition, activation of A2aR in a mouse silicosis model inhibited the Wnt/β-catenin pathway and ameliorated the extent of silica-induced lung fibrosis in mice. To sum up, we uncovered that A2aR inhibits fibrosis and the EMT process in silicosis by regulating the Wnt/β-catenin pathway. Our study can provide an experimental basis for elucidating the role of A2aR in the development of silicosis and offer new ideas for further exploration of interventions for silicosis. • Activation of A2aR reverses the EMT process in lung epithelial cells. • Activation of A2aR can inhibit the Wnt/β-catenin pathway. • Inhibition of the Wnt/β-catenin pathway reverses the EMT process of A549 cells. • Activation of A2aR inhibits the fibrosis process of silicosis. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
49. MALAT1-miR-30c-5p-CTGF/ATG5 axis regulates silica-induced experimental silicosis by mediating EMT in alveolar epithelial cells.
- Author
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Xia, Jiarui, Tian, Yangyang, Shao, Zheng, Li, Chao, Ding, Mingcui, Qi, Yuanmeng, Xu, Xiao, Dai, Kai, Wu, Chenchen, Yao, Wu, and Hao, Changfu
- Subjects
EPITHELIAL cells ,CONNECTIVE tissue growth factor ,SILICOSIS ,EPITHELIAL-mesenchymal transition - Abstract
Epithelial-mesenchymal transdifferentiation of alveolar type Ⅱ epithelial cells is a vital source of pulmonary myofibroblasts, and myofibroblasts formation is recognized as an important phase in the pathological process of silicosis. miR-30c-5p has been determined to be relevant in the activation of the epithelial-mesenchymal transition (EMT) in numerous disease processes. However, elucidating the role played by miR-30c-5p in the silicosis-associated EMT process remains a great challenge. In this work, based on the establishment of mouse silicosis and A549 cells EMT models, miR-30c-5p was interfered with in vivo and in vitro models to reveal its effects on EMT and autophagy. Moreover, metastasis-associated lung adenocarcinoma transcript 1 (MALAT1), connective tissue growth factor (CTGF), autophagy-related gene 5 (ATG5), and autophagy were further interfered with in the A549 cells models to uncover the possible molecular mechanism through which miR-30c-5p inhibits silicosis associated EMT. The results demonstrated the targeted binding of miR-30c-5p to CTGF, ATG5, and MALAT1, and showed that miR-30c-5p could prevent EMT in lung epithelial cells by acting on CTGF and ATG5-associated autophagy, thereby inhibiting the silicosis fibrosis process. Furthermore, we also found that lncRNA MALAT1 might competitively absorb miR-30c-5p and affect the EMT of lung epithelial cells. In a word, interfering with miR-30c-5p and its related molecules (MALAT1, CTGF, and ATG5-associated autophagy) may provide a reference point for the application of silicosis intervention-related targets. • miR-30c-5p inhibits the fibrosis development of mice silicosis. • miR-30c-5p inhibits the EMT process in pulmonary epithelial cells. • miR-30c-5p inhibits EMT by targeting CTGF and ATG5 related autophagy. • MALAT1 regulates the EMT of pulmonary epithelial cells by adsorbing miR-30c-5p. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
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50. Natural nanomaterial as hard template for scalable synthesizing holey carbon naonsheet/nanotube with in-plane and out-of-plane pores for electrochemical energy storage
- Author
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Zhang, Yijie, Lu, Luhua, Zhang, Zhao, Shu, Zhu, Dai, Kai, Liu, Jinghai, Chen, Ying, Jin, Hongyun, and Hou, Shuen
- Published
- 2018
- Full Text
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