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639 results on '"Zhang, Xinglong"'

201. Phase transition of metal–organic frameworks for the encapsulation of enzymes

Author

Ren, Zhen, primary, Zhou, Weiqiang, additional, Weng, Jiena, additional, Qin, Ziyue, additional, Liu, Liwei, additional, Ji, Ning, additional, Chen, Cheng, additional, Shi, Haohao, additional, Shi, Wenxiong, additional, Zhang, Xinglong, additional, Khalil, Islam E., additional, Zheng, Bing, additional, Wu, Jiansheng, additional, Zhang, Weina, additional, and Huo, Fengwei, additional

Published
2022
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207. Atroposelective Access to 1,3‐Oxazepine‐Containing Bridged Biaryls via Carbene‐Catalyzed Desymmetrization of Imines.

Author

Yang, Xing, Wei, Liwen, Wu, Yuelin, Zhou, Liejin, Zhang, Xinglong, and Chi, Yonggui Robin

Subjects
FRONTIER orbitals, ORBITAL interaction, IMINES, TRANSITION state theory (Chemistry), MOLECULAR interactions, ADDITION reactions, ORGANOCATALYSIS
Abstract

We disclose herein an atroposelective synthesis of novel bridged biaryls containing medium‐sized rings via N‐heterocyclic carbene organocatalysis. The reaction starts with addition of the carbene catalyst to the aminophenol‐derived aldimine substrate. Subsequent oxidation and intramolecular desymmetrization lead to the formation of 1,3‐oxazepine‐containing bridged biaryls in good yields and excellent enantioselectivities. These novel bridged biaryl products can be readily transformed into chiral phosphite ligands. Preliminary density function theory calculations suggest that the origin of enantioselectivity arises from the more favorable frontier molecular orbital interactions in the transition state leading to the major product. [ABSTRACT FROM AUTHOR]

Published
2023
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208. Influenza and Universal Vaccine Research in China.

Author

Li, Jiali, Zhang, Yifan, Zhang, Xinglong, and Liu, Longding

Subjects
INFLUENZA, INFLUENZA vaccines, INFLUENZA A virus, SEASONAL influenza, INFLUENZA viruses, VIRUS diseases
Abstract

Influenza viruses usually cause seasonal influenza epidemics and influenza pandemics, resulting in acute respiratory illness and, in severe cases, multiple organ complications and even death, posing a serious global and human health burden. Compared with other countries, China has a large population base and a large number of influenza cases and deaths. Currently, influenza vaccination remains the most cost-effective and efficient way to prevent and control influenza, which can significantly reduce the risk of influenza virus infection and serious complications. The antigenicity of the influenza vaccine exhibits good protective efficacy when matched to the seasonal epidemic strain. However, when influenza viruses undergo rapid and sustained antigenic drift resulting in a mismatch between the vaccine strain and the epidemic strain, the protective effect is greatly reduced. As a result, the flu vaccine must be reformulated and readministered annually, causing a significant drain on human and financial resources. Therefore, the development of a universal influenza vaccine is necessary for the complete fight against the influenza virus. By statistically analyzing cases related to influenza virus infection and death in China in recent years, this paper describes the existing marketed vaccines, vaccine distribution and vaccination in China and summarizes the candidate immunogens designed based on the structure of influenza virus, hoping to provide ideas for the design and development of new influenza vaccines in the future. [ABSTRACT FROM AUTHOR]

Published
2023
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227. Microstructure and Properties of Hydroxyapatite-Containing Ceramic Coatings on Magnesium Alloys by One-Step Micro-Arc Oxidation.

Author

Zhang, Xinglong, Liao, Tianhao, Lai, Long, Wang, Zihao, He, Xiaojia, and Tang, Hui

Subjects
CERAMIC coating, MAGNESIUM alloys, PROTECTIVE coatings, HYDROXYAPATITE coating, MICROSTRUCTURE, BIOABSORBABLE implants
Abstract

Mg and its alloys are considered as biodegradable metallic implant materials, are attracting great attentions. However, the corrosion resistance and biocompatibility required to be improved according to clinical demands in bone implants. In this study, Ca-deficient hydroxyapatite ceramic coating is fabricated on AZ31 magnesium alloy's surface by one-step micro-arc oxidation (MAO) in an alkali electrolyte with different calcium glycerophosphate (CaGP) concentrations. The thickness, roughness, morphology, and composition of the coating are dependent on the concentration of CaGP, determining the protective ability of magnesium alloy. The electrochemical test results demonstrated that corrosion resistance of Mg alloy is improved by applying Ca defected hydroxyapatite containing ceramic coatings. In addition, the coating shows a high bonding strength with the substrate with tensile bond strength higher than 35 MPa. Furthermore, the MAO sample shows a longer wear life compared with the substrate. Hydroxyapatite (HA) containing coating with a good combination of corrosion resistance, bonding strength and wear behavior could be obtained by adjusting the concentration of CaGP in the electrolyte solution. [ABSTRACT FROM AUTHOR]

Published
2022
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240. Modifiers versus Channels: Creating Shape‐Selective Catalysis of Metal Nanoparticles/Porous Nanomaterials

Author

Fang, Chuanzhen, primary, Liu, Liwei, additional, Weng, Jiena, additional, Zhang, Suoying, additional, Zhang, Xinglong, additional, Ren, Zhen, additional, Shen, Yu, additional, Meng, Fanchen, additional, Zheng, Bing, additional, Li, Sheng, additional, Wu, Jiansheng, additional, Shi, Wenxiong, additional, Lee, Sungsik, additional, Zhang, Weina, additional, and Huo, Fengwei, additional

Published
2020
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244. A Super-Oxidized Radical Cationic Icosahedral Boron Cluster

Author

Stauber, Julia M., primary, Schwan, Josef, additional, Zhang, Xinglong, additional, Axtell, Jonathan C., additional, Jung, Dahee, additional, McNicholas, Brendon J., additional, Oyala, Paul H., additional, Martinolich, Andrew J., additional, Winkler, Jay R., additional, See, Kimberly A., additional, Miller, Thomas F., additional, Gray, Harry B., additional, and Spokoyny, Alexander M., additional

Published
2020
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249. Frontiers and Structural Engineering for Building Flexible Zinc–Air Batteries.

Author

Zhang, Tao, Wu, Ningxiang, Zhao, Yanhua, Zhang, Xinglong, Wu, Jiansheng, Weng, Jiena, Li, Sheng, Huo, Fengwei, and Huang, Wei

Subjects
STRUCTURAL engineers, STRUCTURAL engineering, SOLID electrolytes, POWER resources, ENERGY storage
Abstract

With the development of flexible devices, the demand for wearable power sources has increased and gradually become imperative. Zinc–air batteries (ZABs) have attracted lots of research interest due to their high theoretical energy density and excellent safety properties, which can meet the wearable energy supply requirements. Here, the flexibility of energy storage devices is discussed first, followed by the chemistries and development of flexible ZABs. The design of flexible electrodes, the properties of solid‐state electrolytes (SSEs), and the construction of deformable structures are discussed in depth. The researchers working on flexible energy storage devices will benefit from the work. [ABSTRACT FROM AUTHOR]

Published
2022
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250. Electrospun Carbon Nanofibers Loaded with Atomic FeNx/Fe2O3 Active Sites for Efficient Oxygen Reduction Reaction in Both Acidic and Alkaline Media.

Author

Wang, Minkang, Liao, Tianhao, Zhang, Xinglong, Cao, Jinlong, Xu, Shuangquan, Tang, Hui, and Wang, Ying

Subjects
CARBON nanofibers, OXYGEN reduction, PLATINUM catalysts, ENERGY storage, CATALYTIC activity, ALKALINE batteries, FERRIC oxide, ELECTROCATALYSTS
Abstract

Renewable energy storage systems based on oxygen reduction reaction (ORR) call for high‐performance, durable, and low‐cost electrocatalysts. However, practical applications of ORR catalysts available today are hampered by the inability to load accessible catalytic sites efficiently. Herein, a novel and efficient ORR electrocatalyst (Fe2O3/FeNx@CNF) with atomic FeNx sites and neighboring Fe2O3 nanoparticles embedded in interconnected carbon nanofibers prepared via electrospinning is reported. Detailed material characterizations confirm that the as‐prepared catalysts possess a well‐defined fibrous structure with hierarchical pores, large specific surface area, and uniformly distributed Fe2O3/FeNx active sites. Further, it exhibits excellent ORR performance with high onset potential, half‐wave potential, and current density in both alkaline and acidic media. And these electrocatalysts show excellent long‐term performance and tolerance to methanol, exceeding the properties of commercial platinum catalysts. Additionally, the Fe2O3/FeNx@CNF electrocatalyst prepared in this study exhibits high discharge voltage, excellent power density, and cycling durability in Zn–air batteries. Notably, the detailed analyses demonstrate the co‐existence of Fe2O3 nanoparticles and FeNx active sites boost the ORR catalytic activity of the hybrid catalyst. These new findings, particularly the enhancement of intrinsic activity of FeNx sites brought about by Fe2O3 nanoparticles, provide insights into the rational design of hybrid single‐atom ORR electrocatalysts. [ABSTRACT FROM AUTHOR]

Published
2022
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