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Hard-carbon hybrid Li-ion/metal anode enabled by preferred mesoporous uniform lithium growth mechanism

Journal of Energy Chemistry 2024年第1期88卷 252-259,I0006页

作者： Fang Yan Yan Liu yuan Li Yan Wang Zicen Deng Meng Li zhenwei Zhu Aohan Zhou Ting Li Jingyi Qiu Gaoping Cao Shaobo Huang Biyan Wang Hao Zhang School of Chemistry and Biological Engineering University of Science and TechnologyBeijing 100083China Research Institute of Chemical Defense Beijing 100191China College of Physics and Engineering Henan University of Science and TechnologyLuoyang 471023HenanChina National Base for International Science&Technology Cooperation School of ChemistryXiangtan UniversityXiangtan 411105HunanChina Materials and Manufacturing Department Beijing University of TechnologyBeijing 100124China

To achieve high energy density in lithium batteries,the construction of lithium-ion/metal hybrid anodes is a promising strategy.In particular,because of the anisotropy of graphite,hybrid anode formed by graphite/Li metal has low transport kinetics and is easy to causes the growth of lithium dendrites and accumulation of dead Li,which seriously affects the cycle life of batteries and even causes safety problems.Here,by comparing graphite with two types of hard carbon,it was found that hybrid anode formed by hard carbon and lithium metal,possessing more disordered mesoporous structure and lithophilic groups,presents better performance.Results indicate that the mesoporous structure provides abundant active site and storage space for dead lithium.With the synergistic effect of this structure and lithophilic functional groups(–COOH),the reversibility of hard carbon/lithium metal hybrid anode is maintained,promoting uniform deposition of lithium metal and alleviating formation of lithium dendrites.The hybrid anode maintains a 99.5%Coulombic efficiency(CE)after 260 cycles at a specific capacity of 500 m Ah/g.This work provides new insights into the hybrid anodes formed by carbon-based materials and lithium metal with high specific energy and fast charging ability.

关键词： Hard carbon/Li metal hybrid anode Mesoporous structure Surface oxygen functional group Fast charging Lithium batteries

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Monitoring the pH fluctuation of lysosome under cell stress using a near-infrared ratiometric fluorescent probe

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Chinese Chemical Letters 2023年第3期34卷 409-414页

作者： Lijuan Gui Kaizhen Wang Yuxin Wang Jun Yan Xian Liu Jingxuan Guo Ji Liu Dawei Deng Haiyan Chen zhenwei yuan Department of Biomedical Engineering School of EngineeringChina Pharmaceutical UniversityNanjing 210009China Department of Health Technology and Informatics Faculty of Health and Social SciencesThe Hong Kong Polytechnic UniversityHong KongChina

Cell stress responses are associated with numerous diseases including diabetes, neurodegenerative diseases, and cancer. Several events occur under cell stress, in which, are protein expression and organellespecific pH fluctuation. To understand the lysosomal pH variation under cell stress, a novel NIR ratiometric pH-responsive fluorescent probe(BLT) with lysosomes localization capability was developed.The quinoline ring of BLT combined with hydrogen ion which triggered the rearrangement of π electrons conjugated at low pH medium, meanwhile, the absorption and fluorescent spectra of BLT showed a red-shifts, which gived a ratiometric signal. Moreover, the probe BLT with a suitable p Kavalue has the potential to discern changes in lysosomal pH, either induced by heat stress or oxidative stress or acetaminophen-induced(APAP) injury stress. Importantly, this ratiometric fluorescent probe innovatively tracks pH changes in lysosome in APAP-induced liver injury in live cells, mice, and zebrafish. The probe BLT as a novel fluorescent probe possesses important value for exploring lysosomal-associated physiological varieties of drug-induced hepatotoxicity.

关键词： APAP-induced liver injury Ratiometric fluorescent probe Lysosomal pH Cell stress

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Experimental and Numerical Investigation on the Mechanical Behaviors of the Velcro^(■) and Dual-Lock Fasteners

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Journal of Harbin Institute of Technology(New Series) 2019年第2期26卷 61-70页

作者： Jun Zhang Jiaqi Wang zhenwei yuan School of Chemical Engineering and Energy Zhengzhou University

In order to characterize the mechanical behaviors of the Velcro~? and Dual-lock fasteners, a series of tests including the butt-joint(BJ) monotonic tensile and shear, mixed tensile-shear with various loading angles, the loading rates effects, the double cantilever beam(DCB) fracture and 180° peel experiments were performed. The tensile and shear tests results showed that the mechanical behaviors of Velcro~? fastener separation are analogous to ductile materials, and those of Dual-lock fasteners are more like brittle ones. The mixed tensile-shear with various loading angles tests results demonstrated that magnitudes of the peak stresses in 30°, 45°, and 60° have no significant differences, which are lower than those in the monotonic tensile or shear tests for the two fasteners. The effects of the loading rate tests show that the peak stresses of the Velcro~? fastener manifested good performance at the loading rate of 10 to 20 mm/min in the tensile and shear conditions, and the Dual-lock did it well around the loading rates of 10 to 20 mm/min in the tensile condition. The cohesive zone model(CZM) is employed to numerical predict the DCB fracture and the 180° peel tests. The CZM predictions results are proven to commendably capture the two tests separation processes, of the tow fasteners, and the numerical results agreed well with the peeling tests data of the Dual lock fasteners. The results and discussions in this study are expected to bring more understanding to engineers and designers about the performance of Velcro~? and Dual lock fasteners.

关键词： Velcro^(■) fastener Dual-lock fastener mechanical behaviors cohesive zone model numerical prediction

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板翅式换热器传递函数动态模型及参数确定方法

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北京航空航天大学学报 2024年第1期50卷 154-162页

作者：梁兴壮黄志远艾凤明袁振伟汪箭中国科学技术大学火灾科学国家重点实验室合肥230026 中国航空工业集团公司沈阳飞机设计研究所沈阳110035

飞机综合环控/热管理系统迫切需要建立快捷高效的换热器动态仿真模型,以满足先进控制系统设计需求。基于此,针对板翅式换热器动态模型,提出一种包含2个延迟环节和4个一阶惯性环节的传递函数矩阵形式,并从换热器机理模型出发,利用拉普拉... 详细信息

飞机综合环控/热管理系统迫切需要建立快捷高效的换热器动态仿真模型,以满足先进控制系统设计需求。基于此,针对板翅式换热器动态模型,提出一种包含2个延迟环节和4个一阶惯性环节的传递函数矩阵形式,并从换热器机理模型出发,利用拉普拉斯变换推导模型中4个时间常数的计算公式,提出基于换热器效率的传热热阻计算关系式的辨识方法,解决了主要模型参数设置难题。以板翅式换热器为研究对象,在Simulink仿真平台搭建其传递函数动态模型,并与AMESim仿真平台搭建的机理模型进行对比分析,结果显示:2种模型所得空气和冷却水出口温度分别随入口温度和质量流量阶跃变化的动态响应曲线吻合很好,其中,4种工况空气和冷却水出口温度最大稳态偏差分别为0.034℃和0.029℃,当冷却水入口质量流量阶跃变化时,空气出口温度动态响应相对偏差最大,为9.27%,当空气入口质量流量阶跃变化时,冷却水出口温度动态响应相对偏差最大,为7.03%。

关键词：换热器动态模型传递函数矩阵时间常数传热热阻

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Light-up lipid droplets for the visualization of lipophagy and atherosclerosis by coumarin-derived bioprobe

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Chinese Chemical Letters 2021年第8期32卷 2385-2389页

作者： Jinrong Zheng Shuheng Qin Lijuan Gui Hua Li Lixue Fan Yifei Yang Haiyan Chen Hui Xu zhenwei yuan Department of Biomedical Engineering School of EngineeringChina Pharmaceutical UniversityNanjing 210009China School of Pharmacy Key Laboratory of Molecular Pharmacology and Drug Evaluation(Yantai University)Ministry of EducationCollaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of ShandongYantai UniversityYantai 264005China Department of Food Quality and Safety College of Food Science and Engineering/Collaborative Innovation Center for Modern Grain Circulation and Safety/Key Laboratory of Grains and Oils Quality Control and ProcessingNanjing University of Finance and EconomicsNanjing 210023China

Lipid droplets(LDs) are intracellular lipid-metabolism organelles that involved in many physiological processes,metabolic disorders as well as diseases such as atherosclerosis.However,the specific probes that can visually locate abnormal LDs-rich tissues and track LDs-associated behavior to the naked eye with adequate biosafety still are rare.Herein,we develop a new design strategy of LDs-targeted probe based on the solvatochromism of coumarin derivatives.The results revealed that the emission wavelength of coumarin fluorophores gradually red shift in different solvents with increasing polarity,while absorption wavelength almost unchanged.As a result,the enlarged stokes shift of coumarin was emerged from oil to water.Furthermore,properly reducing water solubility and adding electronic donor at the structure of coumarins can enlarge this type of solvatochromism.This discovery was utilized to develop suitable probe for the image of LDs and LDs-rich tissues with high resolution and biosafety.Therefore,LDs-associated behavior was visible to the naked eye during the process of lipophagy and atherosclerosis.We deem that the developed probe here offers a new possibility to accurately diagnosis and analyse LDs-related diseases in clinic and preclinical study.

关键词： Lipid droplets Probe Lipophagy Atherosclerosis

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Dynamic polarization rotation and vector field steering based on phase change metasurface

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Frontiers of physics 2023年第1期18卷 193-199页

作者： Hairong He Hui Yang zhenwei Xie Xiaocong yuan Nanophotonics Research Center Shenzhen Key Laboratory of Micro-scale Optical Information TechnologyInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China

Polarization rotation and vector field steering of electromagnetic wave are of great significance in modern optical applications.However,conventional polarization devices are bulky,monofunctional and lack of tunability,which pose great challenges to the miniaturized and multifunctional applications.Herein,we propose a meta-device that is capable of multi-state polarization rotation and vector field steering based on phase change metasurface.The supercell of the meta-device consists of four Ge2Sb2Te5(GST)elliptic cylinders located on a SiO2 substrate.By independently controlling the phase state(amorphous or crystalline)of each GST elliptic cylinder,the meta-device can rotate the polarization plane of the linearly polarized incident light to different angles that cover from 19.8°to 154.9°at a wavelength of 1550 nm.Furthermore,by merely altering the phase transition state of GST elliptic cylinders,we successfully demonstrated a vector field steering by generating optical vortices carrying orbital angular momentums(OAMs)with topological charges of 0,1 and–1,respectively.The proposed method provides a new platform for investigating dynamically tunable optical devices and has potential applications in many fields such as optical communications and information processing.

关键词： polarization rotation vector field steering phase change metasurface

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Rational design of graphyne-based dual-atom site catalysts for CO oxidation

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Nano Research 2023年第1期16卷 343-351页

作者： zhenwei Zhang Liang Zhang Xiaoyang Wang yuan Feng Xiangwen Liu Wenming Sun Department of Chemistry Beijing Key Laboratory for Optical Materials and Photonic DevicesCapital Normal UniversityBeijing 100048China Linyi Vocational University of Science and Technology(Linyi Institute of Industrial Technology) Linyi 276000China Dassault Systemes(Shanghai)Information Technology Co. Ltd.Shanghai 200120China Institute of Analysis and Testing Beijing Academy of Science and Technology(Beijing Center for Physical and Chemical Analysis)Beijing 100094China TianHe Supercomputing Center of Huaihai Linyi 276000China

There are increasing concerns about the environmental impact of rising atmospheric carbon monoxide concentrations,thus it is necessary to develop new catalysts for efficient CO oxidation.Based on first-principles calculations,the potential ofγ-graphyne(GY)as substrate for metals in the 4th and 5th periods under single-atom and dual-atoms concentration modes has been systematically investigated.It was found that single-atom Co,Ir,Rh,and Ru could effectively oxidate CO molecules,especially for single Rh.Furthermore,proper atoms concentration could boost the CO oxidation activity by supplying more reaction centers,such as Rh^(2)/GY.It was determined that two Rh atoms in Rh^(2)/GY act different roles in the catalytic reaction:one structural and another functional.Screening tests suggest that substituting the structural Rh atom in the center of acetylenic ring by Co or Cu atom is a possible way to maintain the reaction performance while reducing the noble metal cost.This systemic investigation will help in understanding the fundamental reaction mechanisms on GY-based substrates.We emphasize that properly exposed frontier orbital of functional metal atom is crucial in adsorption configuration as well as entire catalytic performance.This study constructs a workflow and provides valuable information for rational design of CO oxidation catalysts.

关键词： density functional theory calculations CO oxidation single-atom catalyst graphyne dual-atom site catalyst

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Influences of Floating-ring Seal Parameters on Clearance Leakage

Influences of Floating-ring Seal Parameters on Clearance Lea...

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作者： zhenwei yuan Junqi Chen School of Mechanical and Power Engineering Zhengzhou University

For a type of floating-ring seal widely used in the fields of aeronautics and astronautics,power and energy,and petrochemical engineering,the influences of various parameters on clearance leakage behavior of floating-ring seal are analyzed using numerical method and by means of MATLAB programming.Based on Bulk-flow model,the governing equations of the flow field in the clearance of floating-ring seal are established.The finite difference method and the staggered grid are used to discretize the governing equations.The SIMPLE algorithm is used to solve the discretized equations.The self-locking position of the floating-ring is calculated by analyzing the equilibrium condition of the floating ring,and accordingly the leakage flowrate of the flow field in the clearance of the floating-ring seal are obtained.Finally,the influences of fluid viscosity,inlet swirl,width of floating ring,and relative roughness of floating-ring and rotor surface s on the leakage flowrate are discussed.

关键词： Floating-ring seal Leakage flowrate Bulk-flow model Seal parameter

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Optical topologicallattices of Bloch-type skyrmion and meron topologies

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Photonics Research 2022年第4期10卷 947-957页

作者： Qiang Zhang zhenwei Xie Peng Shi Hui Yang Hairong He Luping Du Xiaocong yuan Nanophotonics Research Center Shenzhen Key Laboratory of Micro-Scale Optical Information Technology&Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China

Optical skyrmions, quasiparticles that are characterized by the topologically nontrivial vectorial textures of optical parameters such as the electromagnetic field, Stokes parameters, and spin angular momentum, have aroused great attention recently. New dimensions for optical information processing, transfer, and storage have become possible, and developing multiple schemes for manipulating the topological states of skyrmions, thus, is urgent.Here we propose an approach toward achieving dynamic modulation of skyrmions via changing the field symmetry and adding chirality. We demonstrate that field symmetry governs the skyrmionic transformation between skyrmions and merons, whereas material chirality modulates the twist degree of fields and spins and takes control of the Néel-type–Bloch-type skyrmionic transition. Remarkably, the enantioselective twist of skyrmions and merons results from the longitudinal spin arising from the chirality-induced splitting of the hyperboloid in the momentum space. Our investigation, therefore, acts to enrich the portfolio of optical quasiparticles. The chiral route to topological state transitions will deepen our understanding of light–matter interaction and pave the way for chiral sensing, optical tweezers, and topological phase transitions in quantum matter.

关键词： topological nontrivial Bloch

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Corynoxine B targets at HMGB1/2 to enhance autophagy forα-synuclein clearance in fly and rodent models of Parkinson's disease

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药学学报:英文版 2023年第6期13卷 2701-2714页

作者： Qi Zhu Juxian Song Jia-Yue Chen zhenwei yuan Liangfeng Liu Li-Ming Xie Qiwen Liao Richard D.Ye Xiu Chen Yepiao Yan Jieqiong Tan Chris Soon Heng Tan Min Li Jia-Hong Lu State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical SciencesUniversity of MacaoMacao 999078China Medical College of Acupuncture-Moxibustion and Rehabilitation Guangzhou University of Chinese MedicineGuangzhou 510006China Mr.and Mrs.Ko Chi Ming Centre for Parkinson's Disease Research School of Chinese MedicineHong Kong Baptist UniversityHongKong 999077China Guangdong Corporate Key Laboratory of High-end Liquid Medicine R&D IndustrializationShaoguan 512028China Limin Pharmaceutical Factory Livzon Pharmaceutical Group Inc.Shaoguan 512028China Kobilka Institute of Innovative Drug Discovery School of Medicinethe Chinese University of Hong KongShenzhen 518172China Center for Medical Genetics Life Science SchoolCentral South UniversityChangsha 410031China Department of Chemistry College of ScienceSouthern University of Science and TechnologyShenzhen 518055China

Parkinson's disease(PD)is the most common neurodegenerative movement disease.It is featured by abnormal alphα-synuclein(α-syn)aggregation in dopaminergic neurons in the substantia nigra.Macroautophagy(autophagy)is an evolutionarily conserved cellular process for degradation of cellular contents,including protein aggregates,to maintain cellular homeostasis.Corynoxine B(Cory B),a natural alkaloid isolated from Uncaria rhynchophylla(Miq.)Jacks.,has been reported to promote the clearance ofα-syn in cell models by inducing autophagy.However,the molecular mechanism by which Cory B induces autophagy is not known,and theα-syn-lowering activity of Cory B has not been verified in animal models.Here,we report that Cory B enhanced the activity of Beclin 1/VPS34 complex and increased autophagy by promoting the interaction between Beclin 1 and HMGB1/2.Depletion of HMGB1/2 impaired Cory B-induced autophagy.We showed for the first time that,similar to HMGB1,HMGB2 is also required for autophagy and depletion of HMGB2 decreased autophagy levels and phosphatidylinositol 3-kinaseⅢactivity both under basal and stimulated conditions.By applying cellular thermal shift assay,surface plasmon resonance,and molecular docking,we confirmed that Cory B directly binds to HMGB1/2 near the C106 site.Furthermore,in vivo studies with a wild-typeα-syn transgenic drosophila model of PD and an A53Tα-syn transgenic mouse model of PD,Cory B enhanced autophagy,promotedα-syn clearance and improved behavioral abnormalities.Taken together,the results of this study reveal that Cory B enhances phosphatidylinositol 3-kinaseⅢactivity/autophagy by binding to HMGB1/2 and that this enhancement is neuroprotective against PD.

关键词： Corynoxine B Parkinson's disease Neurodegenerative disease α-Synuclein Autophagy PI3KC3 HMGB1 HMGB2

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