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Long-cycling and dendrite-free lithium metal anodes via salt chemistry

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Green Energy & Environment 2021年第6期6卷 791-793页

作者： sainan liu Wenchao Zhang School of Minerals Processing and Bioengineering Central South UniversityChangsha410083China Institute of Environmental Engineering School of Metallurgy and EnvironmentCentral South UniversityChangshaHunan410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution ChangshaHunan410083China Institute for Superconducting and Electronic Materials(ISEM) School of MechanicalMaterialsMechatronics and Biomedical EngineeringFaculty of Engineering and Information SciencesUniversity of WollongongWollongongNSW2500Australia

With over 30 years of development for lithium ion batteries(LIBs),LIBs have achieved great success in terms of their cathodes,anodes,electrolytes,and other necessary components[1].Their battery chemistry has also been... 详细信息

关键词： battery lithium cycling

Nitrogen/sulfur co-doped hollow carbon nanofiber anode obtained from polypyrrole with enhanced electrochemical performance for Na-ion batteries

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Science Bulletin 2018年第2期63卷 126-132页

作者： Zhigao Luo sainan liu Yangshen Cai Shi Li Anqiang Pan Shuquan Liang School of Materials Science and Engineering Central South University Key Laboratory of Nonferrous Metal Materials Science and Engineering Ministry of Education Central South University

Polypyrrole and sulfur derived hollow carbon nanofibers co-doped with nitrogen/sulfur are synthesized and applied as the anode for Na-ion batteries(NIBs). Successful doping of hollow carbon nanofiber with nitrogen and sulfur is confirmed by X-ray photoelectron spectroscopy, scanning and tunneling electron microscopy. Further analysis certifies that sulfur doping has a significant impact in improving the elecctrochemical performance of the carbon-based anodes for NIBs. The obtained N-doped hollow carbon nanofiber and N/S co-doped hollow carbon nanofiber exhibit similar morphologies but different electrochemical behavior. As expected, the N/S co-doped hollow carbon nanofiber anode exhibits enhanced electrochemical performance, including high specific capacity, outstanding long-term stability, and good rate stability.

关键词： Hollow carbon nanofibersNitrogen/sulfur co-doping Anode Sodium ion batteries

Protein@PP-Zn nanocomplex assembled by coordination of zinc ions used for intracellular protein delivery

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Science China Chemistry 2023年第8期66卷 2354-2362页

作者： Liyun Cui sainan liu Fan Wu Hua Chen Yuanfeng Li Linqi Shi Yong liu Rujiang Ma Key Laboratory of Functional Polymer Materials of Ministry of Education Institute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin300071China Wenzhou Institute University of Chinese Academy of SciencesWenzhou Key Laboratory of Interdiscipline and Translational MedicineWenzhou325001China Translational Medicine Laboratory the First Affiliated Hospital of Wenzhou Medical UniversityWenzhou325035China

In recent years,intracellular delivery of protein drugs has attracted great attention,and polymer-based systems have been extensively exploited to develop efficient and safe ***,efficient intracellular delivery of protein drugs remains a challenge because of the cell membrane barrier and endosome ***,we report a protein@PP-Zn nanocomplex,which consists of an imidazole-containing block polymer poly(ethylene glycol)-block-poly(β-amino ester)(PEG-b-PAE(Im),PP),zinc ions,and protein drugs,for efficient intracellular protein ***-b-PAE(Im)could conjugate proteins via the bridging effect of zinc ions which simultaneously coordinate with imidazole groups on polymer and electron donor groups,such as imidazole and primary amine groups,on protein to improve the loading stability of *** a slightly acidic environment near cancer cells,the protonation of PAE(Im)backbone increases the positive charge density of the nanocomplex and promotes *** under a more acidic environment in endosomes,further protonation of imidazole groups leads to the disintegration of the nanocomplex and the breakdown of endosomes because of the proton sponge ***,protein is released into the *** the assistance of the nanocomplex,proteins with different sizes and isoelectric points are effectively delivered into *** work provides a stable,efficient and universal strategy for intracellular protein delivery.

关键词： protein zinc ions intracellular delivery coordination polymer

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Preparation of a tantalum-based MoSi_(2)–Mo coating resistant to ultra-high-temperature thermal shock by a new two-step process

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Journal of Materials Science & Technology 2021年第22期81卷 117-122页

作者： sainan liu Hongtai Shen Jiawei Xu Xiaojun Zhou Jianfei liu Zhenyang Cai Xiaojun Zhao Lairong Xiao School of Materials Science and Engineering Central South UniversityChangshaHunan410083China Center for Mineral Materials School of Minerals Processing and BioengineeringCentral South UniversityChangsha410083HunanChina Key Laboratory of Non-ferrous Metal Materials Science and Engineering Ministry of EducationCentral South UniversityChangsha410083China

To develop an ultra-high-temperature resistant coating for a reusable thermal protection system,the preparation of a tantalum-based MoSi_(2)-Mo coating by a new two-step process of multi-arc ion plating and halide activated pack cementation is *** coating has a dense structure and is well compatible with the tantalum substrate,which can be thermally shocked from room temperature to 1750℃ for 360 cycles without *** mechanism of the coating’s excellent resistance to high-temperature thermal shocks is that a strong-binding gradient interface and a dense SiO_(2) oxide scale with good oxygen resistance are formed by the high-temperature self-diffusion of Si.

关键词： Thermal shock MoSi_(2) Tantalum Multi-arc ion plating Pack cementation

Form Properties of Moving Targets Bias Smooth Pursuit Target Selection in Monkeys

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Neuroscience Bulletin 2023年第8期39卷 1246-1262页

作者： Huixi Dou Huan Wang sainan liu Jun Huang Zuxiang liu Tiangang Zhou Yan Yang State Key Laboratory of Brain and Cognitive Science Institute of BiophysicsChinese Academy of SciencesBeijing 100101China Institute of Artifcial Intelligence Hefei Comprehensive National Science CenterHefei 230088China Division of Life Sciences and Medicine University of Science and Technology of ChinaHefei 230026China University of Chinese Academy of Sciences Beijing 100049China

During natural viewing,we often recognize multiple objects,detect their motion,and select one object as the target to *** remains to be determined how such behavior is guided by the integration of visual form and motion *** address this,we studied how monkeys made a choice to track moving targets with different forms by smooth pursuit eye movements in a two-target *** found that pursuit responses were biased toward the motion direction of a target with a *** computing the relative weighting,we found that the target with a hole exhibited a larger weight for vector *** global hole feature dominated other form *** dominance failed to account for changes in pursuit responses to a target with different forms moving *** findings suggest that the integration of visual form and motion perception can reshape the competition in sensorimotor networks to guide behavioral selection.

关键词： Global hole feature Smooth pursuit eye movements Sensorimotor transformation Visual form perception Visual motion perception Monkeys

Allelic Analyses of the Arabidopsis YUC1 Locus Reveal Residues and Domains Essential for the Functions of YUC Family of Flavin Monooxygenases

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Journal of Integrative Plant Biology 2011年第1期53卷 54-62页

作者： Xianhui Hou sainan liu Florencia Pierri Xinhua Dai Li-Jia Qu Yunde Zhao National Laboratory for Protein Engineering and Plant Genetic Engineering Peking-Yale Joint Research Center for Plant Molecular Genetics and AgroBiotechnology College of Life Sciences Peking University Beijing 100871 China Section of Cell and Developmental Biology University of California at San Diego La Jolla California 92093-0116 USA

Flavin monooxygenases （FMOs） play critical roles in plant growth and development by synthesizing auxin and other signaling molecules. However, the structure and function relationship within plant FMOs is not understood. Here we defined the important residues and domains of the Arabidopsis YUC1 FMO, a key enzyme in auxin biosynthesis. We previously showed that simultaneous inactivation of YUC1 and its homologue YUC4 caused severe defects in vascular and floral development. We mutagenized the yuc4 mutant and screened for mutants with phenotypes similar to those of yucl yuc4 double mutants. Among the isolated mutants, five of them contained mutations in the YUC1 gene. Interestingly, the mutations identified in the new yucl alleles were concentrated in the two GXGXXG motifs that are highly conserved among the plant FMOs. One such motif presumably binds to flavin adenine dinucleotide （FAD） cofactor and the other binds to nicotinamide adenine dinucleotide phosphate （NADPH）. We also identified the Ser139 to Phe conversion in yucl, a mutation that is located between the two nucleotide-binding sites. By analyzing a series of yucl mutants, we identified key residues and motifs essential for the functions of YUC1 FMO.

关键词： ARABIDOPSIS FLAVINS MONOOXYGENASES PLANT enzymes PHOTOSYNTHESIS NAD (Coenzyme) PLANT mutation NUCLEOTIDES AUXIN

Boosting high initial coulombic efficiency of hard carbon by in-situ electrochemical presodiation

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Journal of Energy Chemistry 2023年第2期77卷 310-316,I0008页

作者： Nannan Qin Yanyan Sun Chao Hu sainan liu Zhigao Luo Xinxin Cao Shuquan Liang Guozhao Fang School of Materials Science and Engineering Central South UniversityChangsha 410083HunanChina School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina College of Chemistry Xiangtan UniversityXiangtan 411105HunanChina Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province Central South UniversityChangsha 410083HunanChina

Hard carbon(HC)is a promising anode material for sodium ion batteries(SIBs),whereas inferior initial coulombic efficiency(ICE)severely limits its practical *** the present work,we propose an in situ electrochemical presodiation approach to improve ICE by mixing sodium biphenyl(Na-Bp)dimethoxyethane(DME)solution with DME-based ether electrolyte.A solid electrolyte interface(SEI)could be formed beforehand on the HC electrode and Na^(+)was absorbed to nanopores and graphene stacks,compensating for the sodium loss and preventing electrolyte decomposition during the initial charge and discharge *** this way,the ICE of half-cells was increased to nearly 100%and that of full-cells from 45%to 96%with energy density from 132.9 to 230.5 W h kg^(-1).Our work provides an efficient and facile method for improving ICE,which can potentially promote the practical application of HCbased materials.

关键词： Hard carbon In situ presodiation Initial coulombic efficiency Solid electrolyte interface Sodium-ion batteries

Effect of VEGF/GREDVY Modified Surface on Vascular Cells Behavior

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Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 244-254页

作者：魏来 TAN Jianying LI Li WANG Huanran liu sainan ZENG Zheng liu Tao WANG Jian 陈俊英 WENG Yajun School of Materials Science and Engineering Southwest Jiaotong UniversityChengdu 610031 China

We synthesized B-He/B-GREDVY and immobilized them on avidin-coated *** examine the immobilization of molecules in the material, the following experiments were performed:fluorescein isothiocyanate(FITC) fluorescence staining, water contact angle and atomic force microscopy(AFM) measurements. Besides, the biological evaluation experiments were also performed, such as platelets adhesion and activation, the culturing of smooth muscle cells(SMC) and endothelial cells(EC). These experimental results show that the modified surfaces could prevent the hyperproliferation of SMC, and promote the proliferation and migration of EC and EPC. Furthermore, the adding of VEGF improved the EC adhesion in a dynamic environment. Generally, it is expected that the modified surfaces could be used to accelerate the formation of the newly endothelial layer for the construction of platforms for coronary artery stent therapy.

关键词： biotin-GREDVY VEGF anticoagulation endothelial cells endothelial progenitor cells

Metal-organic framework-derived porous shuttle-like vanadium oxides for sodium-ion battery application

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Nano Research 2018年第1期11卷 449-463页

作者： Yangsheng Cai Guozhao Fang Jiang Zhou sainan liu Zhigao Luo Anqiang Pan Guozhong Cao I Shuquan Liang School of Materials Science and Engineering Central South University Changsha 410083 China Key Laboratory of Nonferrous Metal Materials Science and Engineering Ministry of Education Central South University Changsha 410083 China Department of Materials and Engineering University of Washington Seattle WA 98195-2120 USA

Vanadium oxides with a layered structure are promising candidates for both lithium-ion batteries and sodium-ion batteries （SIBs）. The self-template approach, which involves a transformation from metal-organic frameworks （MOFs） into porous metal oxides, is a novel and effective way to achieve desirable electrochemical performance. In this stud~ porous shuttle-like vanadium oxides （i.e., V205, V203/C） were successfully prepared by using MIL-88B （V） as precursors with a specific calcination process. As a proof-of-concept application, the as- prepared porous shuttle-like VaOdC was used as an anode material for SIBs. The porous shuttle-like V203/C, which had an inherent layered structure with metallic behavior, exhibited excellent electrochemical properties. Remarkable rate capacities of 417, 247, 202, 176, 164, and 149 mAh.g-1 were achieved at current densities of 50, 100, 200, 500, 1,000, and 2,000 mA.g-1, respectively. Under cycling at 2 A.g-1, the specific discharge capacity reached 181 mAh.g-1, with a low capacity fading rate of 0.032% per cycle after 1,000 cycles. Density functional theory calculation results indicated that Na ions preferred to occupy the interlamination rather than the inside of each layer in the V203. Interestingly, the special layered structure with a skeleton of dumbbell-like V-V bonds and metallic behavior was maintained after the insertion of Na ions, which was beneficial for the cycle performance. We consider that the MOF precursor of MIL-88B （V） can be used to synthesize other porous V-based materials for various applications.

关键词： vanadium oxides metal-organic frameworks porous structure density functional theory(DFT) calculation sodium-ion batteries