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Flexible PEDOT:PSS nanopapers as“anion-cation regulation”synergistic interlayers enabling ultra-stable aqueous zinc-iodine batteries

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Journal of Energy Chemistry 2022年第12期75卷 310-320,I0008页

作者： Ying zhang Tianyu Zhao Shanchen Yang yaxin zhang Yue Ma Zhaohui Wang College of Materials Science and Engineering Hunan UniversityChangsha 410082HunanChina State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072ShaanxiChina

Aqueous zinc-iodine(Zn-I_(2))batteries are promising candidates for low-cost grid-scale energy storage ***,the long-term stability and energy density of the Zn-I_(2)batteries are largely hindered by the lack of feasible and scalable methods that coherently suppress polyiodide shuttling and Zn dendrites growth,especially at high current ***,a flexible,thin and lightweight poly(3,4-ethy lenedioxythiophene):polystyrene sulfonate(PEDOT:PSS)nanopaper is designed as an“anion-cation regulation”synergistic interlayer to tackle the above *** PEDOT:PSS interlayer exhibits a 3D nanofibrous network with uniformly distributed mesopores,abundant polar groups and intrinsic conductivity,which renders an even Zn^(2+)flux at Zn anode and facilitates homogeneous current distributions at I_(2)***,such interlayer can act as physiochemical shield to enhance the utilization of I_(2)cathode via the coulombic repulsion and chemical adsorption effect against polyiodide ***,long-term dendrite-free Zn plating/stripping is achieved at simultaneous high current density and high areal capacity(550 h at 10 m A cm^(-2)/5 m Ah cm^(-2)).Zn-I_(2)batteries harvest a high capacity(230 m Ah g^(-1)at 0.1 A g^(-1))and an ultralong lifespan(>20000 cycles)even at 10 A g^(-1).This work demonstrates the potential use of the multifunctional interlayers for Zn-I_(2)battery configuration innovation by synergistic regulation of cations and anions at the electrodes/electrolyte interface.

关键词： PEDOT:PSS Interlayer Polyiodide shuttling Zn dendrites Aqueous zinc-iodine batteries

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A biepitope,adjuvant-free,self-assembled influenza nanovaccine provides cross-protection against H3N2 and H1N1 viruses in mice

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Nano Research 2022年第9期15卷 8304-8314页

作者： Yongbo Qiao yaxin zhang Jie Chen Shenghui Jin Yarning Shan National Engineering Laboratory for AIDS Vaccine School of Life SciencesJilin UniversityChangchun 130012Chin

Currently,the incorporation of multiple epitopes into vaccines is more desirable than the incorporation of a single antigen for universal influenza vaccine ***,epitopes induce poor immune *** the use of adjuvants can overcome this obstacle,it may raise new *** antigen delivery vehicles that can function as both antigen carriers and intrinsic adjuvants are highly desired for vaccine ***,we report a biepitope nanovaccine that provides complete protection in mice against H3N2 virus as well as partial protection against H1N1 *** vaccine(3MCD-f)consists of two conserved epitopes(matrix protein 2 ectodomain(M2e)and CDhelix),and these epitopes were presented on the surface of ferritin in a sequential tandem *** immunization with 3MCD-f in the absence of adjuvant induces robust humoral and cellular immune *** results provide a proof of concept for the 3MCD-f nanovaccine that might be an ideal candidate for future influenza pandemics.

关键词： influenza universal vaccine multi-epitope nanovaccine

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Stepwise superposition approximation approach for analytical solutions with non-zero initial concentration using existing solutions of zero initial concentration in contaminate transport

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Journal of Environmental Sciences 2011年第6期23卷 923-930页

作者： Hongtao Wang Rong Han Yan Zhao Wenjing Lu yaxin zhang Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China

Analytical solutions for contaminant transport are widely used for both theoretical and practical ***,many existing solutions are obtained subject to an initial condition of zero concentration,which is often unrealistic in many practical *** article proposed a stepwise superposition approximation approach to solve the non-zero initial concentration problem for first-type and third-type boundary conditions by using the existing zero initial concentration *** examples showed that the approach was highly efficient if a proper superposition scheme with relative concentration increments was *** key parameter that controlled the convergence speed was the time increment（△t） multiplied by the rate constant（λ）.The approach served also as an alternative way to make a convenient concentration calculation even if the non-zero initial concentration solution of a problem was known.

关键词： analytical solution contaminate transport non-zero initial concentration superposition approximation relative concentration increment

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Graphene TiO_2 nanocomposites with high photocatalytic activity for the degradation of sodium pentachlorophenol

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Journal of Environmental Sciences 2014年第10期26卷 2114-2122页

作者： yaxin zhang Zeyu Zhou Tan Chen Hongtao Wang Wenjing Lu College of Environmental Science and Engineering Hunan University School of Environment Tsinghua University

A series of graphene–TiO2photocatalysts was synthesized by doping TiO2 with graphene oxide via hydrothermal treatment. The photocatalytic capability of the catalysts under ultraviolet irradiation was evaluated in terms of sodium pentachlorophenol（PCP-Na） decomposition and mineralization. The structural and physicochemical properties of these nanocomposites were characterized by X-ray diffraction, N2adsorption–desorption, transmission electron microscopy, scanning electron microscopy, Ultraviolet–visible diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectra, and Fourier-transform infrared spectroscopy. The graphene–TiO2nanocomposites exhibited higher photocatalytic efficiency than commercial P25 for the degradation of PCP-Na, and 63.4% to 82.9% of the total organic carbon was fully mineralized. The improved photocatalytic activity may be attributed to the accelerated interfacial electron-transfer process and the significantly prolonged lifetime of electron-hole pairs imparted by graphene sheets in the nanocomposites. However,excessive graphene and the inhomogeneous aggregation of TiO2 nanoparticles may decrease photodegradation efficiency.

关键词： Photocatalysis Graphene TiO2 PCP-Na Degradation

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Early Warning of Heavy Metal Pollution after Tailing Pond Failure Accident

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Journal of Earth Science 2022年第4期33卷 1047-1055页

作者： Yonggui Wang Yinqun Yang Qiang Li yaxin zhang Xiaolong Chen Hubei Key Laboratory of Critical Zone Evolution School of Geography and Information EngineeringChina University of GeosciencesWuhan 430074China Changjiang Water Resources Protection Institute Wuhan 430051China Beijing Tsinghua Holdings Human Settlements Environment Institute Beijing 100083China

Heavy metal pollution is a major issue after tailing pond failure *** is important to predict pollution trends for limited data of pollution sources.A simple phase separation heavy metal model was built for early warning simulation of heavy metal pollution *** on this,a new simulation framework has been developed to predict the pollution trends of the downstream according to the measured data at upstream *** setting the upstream monitoring date as the inflow boundary condition,the changing processes of heavy metal manganese(Mn) with different phases in the downstream can be accurately simulated and *** showed that the concentration of the suspended phase in the downstream was larger than that in the aqueous phase and sediment *** this,the early warning of pollution trends after accidents could be made a few days *** indicates that the impact of sediment on heavy metal should not be ignored in the early warning of tailing pond failure accidents.

关键词： heavy metal pollution early warning tailing pond failure accident phase separation model

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Improving benzene catalytic oxidation on Ag/Co_(3)O_(4) by regulating the chemical states of Co and Ag

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Journal of Environmental Sciences 2024年第9期143卷 201-212页

作者： Hao Guo Tao Guo Mengqi Zhao yaxin zhang Wenfeng Shangguan Yinnian Liao State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources Xinjiang UniversityXinjiang 830017China Xinjiang Key Laboratory of Coal Clean Conversion&Chemical Engineering Process Xinjiang UniversityXinjiang 830017China School of Chemical Engineering and Technology Xinjiang UniversityXinjiang 830017China Research Center for Combustion and Environmental Technology Shanghai Jiao Tong UniversityShanghai 200240China School of Applied Chemistry and Materials Zhuhai College of Science and TechnologyGuangdong 519041China

Silver(9 wt.%)was loaded on Co_(3)O_(4)-nanofiber using reduction and impregnation methods,*** to the stronger electronegativity of silver,the ratios of surface Co^(3+)/Co^(2+) on Ag/Co_(3)O_(4) were higher than on Co_(3)O_(4),which further led to more adsorbed oxygen species as a result of the charge ***,the introducing of silver also obviously improved the reducibility of Co_(3)O_(4).Hence the Ag/Co_(3)O_(4) showed better catalytic performance than Co_(3)O_(4) in benzene *** with the Ag/Co_(3)O_(4) synthesized via impregnation method,the one prepared using reduction method(named as Ag Co-R)exhibited higher contents of surface Co^(3+) and adsorbed oxygen species,stronger reducibility,as well as more active surface lattice oxygen ***,Ag Co-R showed lowest T_(90) value of 183℃,admirable catalytic stability,largest normalized reaction rate of1.36×10^(-4)mol/(h·m^(2))(150℃),and lowest apparent activation energy(E_(a))of 63.2 kJ/*** analyzing of in-situ DRIFTS indicated benzene molecules were successively oxidized to phenol,o-benzoquinone,small molecular intermediates,and finally to CO_(2) and water on the surface of Ag *** last,potential reaction pathways including five detailed steps were proposed.

关键词： Reduction method Co_(3)O_(4)-supported Ag catalyst,VOCs Benzene oxidation Reaction mechanism

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Adsorption of mixed cationic-nonionic surfactant and its effect on bentonite structure

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Journal of Environmental Sciences 2012年第8期24卷 1525-1532页

作者： yaxin zhang Yan Zhao Yong Zhu Huayong Wu Hongtao Wang Wenjing Lu School of Environment Tsinghua UniversityBeijing 100084China School of Environment Beijing Normal UniversityBeijing 100875China

The adsorption of cationic-nonionic mixed surfactant onto bentonite and its effect on bentonite structure were investigated. The objective was to improve the understanding of surfactant behavior on clay mineral for its possible use in remediation technologies of soil and groundwater contaminated by toxic organic compounds. The cationic surfactant used was hexadecylpyridinium bromide （HDPB）, and the nonionic surfactant was Triton X-100 （TXl00）. Adsorption of TXl00 was enhanced significantly by the addition of HDPB, but this enhancement decreased with an increase in the fraction of the cationic surfactant. Part of HDPB was replaced by TXl00 which decreased the adsorption of HDPB. However, the total adsorbed amount of the mixed surfactant was still increased substantially, indicating the synergistic effect between the cationic and nonionic surfactants. The surfaetant-modified bentonite was characterized by Brunauer-Emmett-Teller specific surface area measurement, Fourier transform infrared spectroscopy, and thermogravimetric-derivative thermogravimetric/differential thermal analyses. Surfactant intercalation was found to decrease the bentonite specific surface area, pore volume, and surface roughness and irregularities, as calculated by nitrogen adsorption-desorption isotherms. The co-adsorption of the cationic and nonionic surfactants increased the ordering conformation of the adsorbed surfactants on bentonite, but decreased the thermal stability of the organobentonite system.

关键词： surfactant bentonite surfactant modification adsorption

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Microscopic defects formation and dynamic mechanical response analysis of Q345 steel plate subjected to explosive load

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Defence Technology（防务技术） 2024年第2期32卷 430-442页

作者： Zhengqing Zhou Zechen Du Yulong zhang Guili Yang Ruixiang Wang Yuzhe Liu Peize zhang yaxin zhang Xiao Wang Research Institute of Macro-Safety Science University of Science and TechnologyBeijing100083China School of Civil and Resource Engineering University of Science and TechnologyBeijing100083China China North Industry Advanced Technology Generalization Institute Beijing100089China College of Field Engineering PLA Army Engineering UniversityNanjing210007China School of Mechanical Engineering Nantong UniversityNantong226019China

As the basic protective element, steel plate had attracted world-wide attention because of frequent threats of explosive loads. This paper reports the relationships between microscopic defects of Q345 steel plate under the explosive load and its macroscopic dynamics simulation. Firstly, the defect characteristics of the steel plate were investigated by stereoscopic microscope(SM) and scanning electron microscope(SEM). At the macroscopic level, the defect was the formation of cave which was concentrated in the range of 0-3.0 cm from the explosion center, while at the microscopic level, the cavity and void formation were the typical damage characteristics. It also explains that the difference in defect morphology at different positions was the combining results of high temperature and high pressure. Secondly, the variation rules of mechanical properties of steel plate under explosive load were studied. The Arbitrary Lagrange-Euler(ALE) algorithm and multi-material fluid-structure coupling method were used to simulate the explosion process of steel plate. The accuracy of the method was verified by comparing the deformation of the simulation results with the experimental results, the pressure and stress at different positions on the surface of the steel plate were obtained. The simulation results indicated that the critical pressure causing the plate defects may be approximately 2.01 GPa. On this basis, it was found that the variation rules of surface pressure and microscopic defect area of the Q345 steel plate were strikingly similar, and the corresponding mathematical relationship between them was established. Compared with Monomolecular growth fitting models(MGFM) and Logistic fitting models(LFM), the relationship can be better expressed by cubic polynomial fitting model(CPFM). This paper illustrated that the explosive defect characteristics of metal plate at the microscopic level can be explored by analyzing its macroscopic dynamic mechanical response.

关键词： Explosive load Q345 steel Micro defect Finite element simulation Dynamic response Data fitting

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Spin-decoupled metasurface for simultaneous detection of spin and orbital angular momenta via momentum transformation

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Light(Science & Applications) 2021年第4期10卷 636-647页

作者： Yinghui Guo Shicong zhang Mingbo Pu Qiong He Jinjin Jin Mingfeng Xu yaxin zhang Ping Gao Xiangang Luo State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China School of Optoelectronics University of Chinese Academy of SciencesBeijing 100049China

With inherent orthogonality,both the spin angular momentum(SAM)and orbital angular momentum(OAM)of photons have been utilized to expand the dimensions of quantum information,optical communications,and information processing,wherein simultaneous detection of SAMs and OAMs with a single element and a single-shot measurement is highly ***,a single azimuthal-quadratic phase metasurface-based photonic momentum transformation(PMT)is illustrated and utilized for vortex *** different vortices are converted into focusing patterns with distinct azimuthal coordinates on a transverse plane through PMT,OAMs within a large mode space can be determined through a single-shot ***,spin-controlled dual-functional PMTs are proposed for simultaneous SAM and OAM sorting,which is implemented by a single spin-decoupled metasurface that merges both the geometric phase and dynamic ***,our proposed method can detect vectorial vortices with both phase and polarization singularities,as well as superimposed vortices with a certain interval *** results obtained at several wavelengths in the visible band exhibit good agreement with the numerical *** the merits of ultracompact device size,simple optical configuration,and prominent vortex recognition ability,our approach may underpin the development of integrated and high-dimensional optical and quantum systems.

关键词： momentum angular simultaneous

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Dingxin recipe alleviates atherosclerosis injury in Apo E-knockout mice via downregulation of visfatin expression and inhibition of the visfatin-induced inflammatory response

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Journal of Traditional Chinese Medicine 2020年第6期40卷 938-946页

作者： Cui Xiaobing Huang Zhiyong Lou Linjie Cheng Saibo zhang Yu zhang yaxin Jia Yuhua Zhou Fenghua School of Traditional Chinese Medicine Southern Medical UniversityGuangzhou 510515China Integrated Hospital of Traditional Chinese Medicine Southern Medical UniversityGuangzhou 510310China The Third Affiliated Hospital Southern Medical UniversityGuangzhou 510630China Department of Traditional Chinese Medicine the First Affiliated Hospital of Wenzhou Medical CollegeWenzhou 325000China Department of Traditional Chinese Medicine Xinyang Central HospitalXinyang 464000China

OBJECTIVE:To further elucidate the mechanism underlying the anti-atherosclerotic effect of Dingxin recipe(DXR).METHODS:Fifty 6-week-old male Apo E^-/-mice were randomly divided into the following groups:model,simvastatin(5 mg·kg^-1·d^-1),DXR low-dose(9.30 g·kg^-1·d^-1),DXR middle-dose(18.59 g·kg^-1·d^-1)and DXR high-dose(37.18 g·kg^-1·d^-1)(n=10).Ten male C57BL/6J mice were used as the control *** Apo E^-/-mice were fed a high-fat diet(HFD)and the control mice received a common *** HFD for 12 weeks,the mice were treated with DXR or simvastatin for another 12 *** expression of inflammatory cytokines and visfatin was determined in serum and atherosclerotic lesions by enzyme-linked immunosorbent *** expression was also assessed in aortic atherosclerotic *** vessel endothelial cells(VECs)were pretreated with DXR sera prior to *** effects of DXR were analyzed to elucidate its protective mechanism against visfatin-induced inflammation in ***:DXR regulated blood lipids and reduced tumor necrosis factor-α(TNF-α),interleukin-6(IL-6),intercellular adhesion molecules-1(ICAM-1),vascular cell adhesion molecule-1(VCAM-1)and visfatin expression in Apo E^-/-mice,particularly at the higher *** areas of atherosclerotic lesions in the DXR groups were significantly smaller than those in the model *** alleviated visfatin-induced VEC injury via downregulation of TNF-α,IL-6,ICAM-1 and VCAM-1 through mitogen-activated protein kinase ***:DXR alleviated atherosclerosis injury via downregulation of visfatin expression and inhibition of the visfatin-induced inflammatory response in VECs.

关键词： Atherosclerosis Nicotinamide phosphoribosyltransferase Inflammation Mitogen-activated protein kinases Dingxin recipe

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