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A strategy based on water soluble coal tar pitches to construct MnO_(2)@C composite materials with high electrochemical performance

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Science China(Technological Sciences) 2024年第1期67卷 311-320页

作者： LIU Bo WANG Kun GUO ZhaoQi HAN BeiBei XU GuiYing JU DongYing AN BaiGang LI YongCheng NI ZhenYong ZHOU WeiMin Key Laboratory of Energy materials and Electrochemistry Research Liaoning Province University of Science and Technology LiaoningAnshan 114051China Advanced Science Research Laboratory Saitama Institute of TechnologyFusaiji 1690Japan Liaoning Starry Sky Sodium Battery Co. Ltd.Anshan 114051China Sinosteel Anshan Research Institute of Thermo-Energy Co. Ltd.Anshan 114051China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228China Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China

The water soluble coal tar pitches(WS-CTPs)were successfully prepared and used to construct the MnO_(2)@C composite materials by a hydrothermal *** is interestingly observed that the structures and morphologies of MnO_(2)@C materials can be controlled by controlling the dosages of WS-CTPs and ***,it is aware that MnO_(2)exists in the MnO_(2)@C materials in an amorphous *** with MnO_(2),MnO_(2)@C materials output a remarkable improvement in electrochemical *** instance,MnO_(2)@C-0.3 shows the storage capacity at 965.7 mA h g^(−1)after 300 cycles at a current density of 0.1 A g^(−1).In addition,after 600 cycles at a current density of 1.0 A g^(−1),the storage capacity of MnO_(2)@C-0.3 still keeps 450.3 mA h g^(−1),indicating that MnO_(2)@C-0.3 owns tremendous cycle stability at a high current *** view of the fact that the coal tar pitches possess great cost advantages,the strategy of using WS-CTPs as a carbon source to cover the metal oxides is a competitive way to expand the application of metal oxides in the fabrication of electrodes of LIBs.

关键词： water soluble coal tar pitches MnO_(2) composite materials lithium ion batteries(LIBs) energy storage systems(ESSs) coal tar pitches

Model of fractured medium and nondestructive control of composite materials

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Chinese Journal of Aeronautics 2024年第2期37卷 93-99页

作者： Vasily GOLUBEV Ilia NIKITIN Katerina BEKLEMYSHEVA Department of Computers Science and Numerical Mathematics Moscow Institute of Physics and TechnologyDolgoprudny 141700Russia Mathematical Modeling and Management Department of InformatizationInstitute of Computer Aided Design RASMoscow 123056Russia

Non-destructive testing of composites is an important issue in the modern aircraft *** are susceptible to the barely visible impact damage which can affect the residual strength of the material and occurs both during production and *** continuum model for describing the damaged zone is *** slip theory relations used for a continuous distribution of slip planes are *** the initial stage,the isotropic background model is *** model allows the material slippage along the fractures based on the Coulomb friction law with the small viscous *** this regime,the govern system of equations becomes *** overcome this difficulty,the explicit-implicit grid-characteristic scheme is *** standard ultrasound diagnostic procedure of damaged composite materials is successfully *** with the trivial free-surface fracture model,different reactions on the compression and stretch waves are *** approach provided an effective way for the simulation of complex dynamic behavior of damage zones.

关键词： Non-destructive testing composite materials Numerical modeling Continuum model Grid-characteristic method

Research Progress of Carbon-Silicone composite materials

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Expert Review of Chinese Chemical

Expert Review of Chinese Chemical 2024年第2期2卷 1-7页

作者： Beibei Liu Rongjie Kan College of Chemistry and Chemical Engineering Nantong University Shenyang Institute of Chemical Technology

Silicone is a kind of polymer material with high cross-linked structure,which is com-posed by Si-O-Si main *** to the special molecular chain structure,silicone mate-rials are characterized by oxidation resistance,aging resistance,high and low temperature resistance and chemical corrosion ***,silicone materials have process-able properties,simple forming process,good mechanical property,non-toxic and ***,silicone has been widely concerned by researchers at home and *** this paper,the main research progress and application directions of carbon-silicone composite at home and abroad in recent years are reviewed.

关键词： carbon materials grapheme silicone composite materials

A new model for thermal conductivity of“continuous matrix/dispersed and separated 3D-particles”type composite materials and its application to WC-M(M=Co,Ag)systems

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Journal of materials Science & Technology 2022年第2期97卷 123-133页

作者： Shiyi Wen Yong Du Jing Tan Yuling Liu Peng Zhou Jianzhan Long George Kaptay State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Hunan Provincial Key Defense Laboratory of High Temperature Wear-Resisting materials and Preparation Technology Hunan University of Science and TechnologyXiangtan 411201China State Key Laboratory of Cemented Carbide Zhuzhou 412000China University of Miskolc MiskolcEgyetemváros3515Hungary

In the present work a new thermal conductivity model is developed for two-phase composite materials,which are consisted of a continuous matrix and dispersed 3 D-particles separated from each other by the matrix as a function of grain size and volume ratio of the dispersed particles at different *** model is applied to reproduce experimental thermal conductivity values of cemented carbide systems WC-Co and *** agreement was found between measured thermal conductivity data originating from both this work and recent literature and the calculated ones only using semi-empirical parameters for the interfacial thermal resistance(ITR)values at WC/Co,WC/Ag and WC/WC interfaces as a function of ***,the temperature and grain size dependence of the thermal conductivity for WC is established for the first *** model works well for the case when the matrix(Ag)has a higher thermal conductivity compared to that of the WC particles and also for the case when the matrix(Co)has a lower thermal conductivity compared to that of the WC *** new model forms a physically sound basis for further development/materials design of cemented carbides and particlereinforced composite materials.

关键词： Thermal conductivity WC-Co WC-Ag Modeling Cemented carbides composite materials

Dynamic Response of composite materials with 2D Reduced Micromorphic Model

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Acta Mechanica Solida Sinica 2022年第4期35卷 603-615页

作者： A.R.El Dhaba C.W.Lim Department of Mathematics Faculty of ScienceDamanhour UniversityDamanhourEgypt Department of Architecture and Civil Engineering City University of Hong KongKowloonHong Kong SARChina

In this article,we introduce a complete set of constitutive relations and field equations for the linear reduced micromorphic *** further investigate the internal variables and their relationship in the case of two-dimensional(2D)wave *** dynamic response is investigated for composite materials,which is due to an external wave in two dimensions applied at the boundary of the considered *** solutions for the model are unavailable at this stage due to dependency of the field equations on spatial and time variables in a complicated manner.A finite element approach is adopted to derive approximate solutions for the field equations,and numerical finite element solutions for the internal fields are presented in detail and discussed.

关键词： composite materials Finite element method(FEM) Reduced micromorphic model Wave propagation

The Direct Method of Lines for Forward and Inverse Linear Elasticity Problems of composite materials in Star-shaped Domains

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Numerical Mathematics(Theory,Methods and Applications) 2023年第1期16卷 242-276页

作者： Xiaopeng Zhu Zhizhang Wu Zhongyi Huang Department of Mathematical Sciences Tsinghua UniversityBeijing 100084China Department of Mathematics The University of Hong KongPokfulam RoadHong Kong SARChina

In this paper,we generalize the direct method of lines for linear elasticity problems of composite materials in star-shaped domains and consider its application to inverse elasticity *** assume that the boundary of the star-shaped domain can be described by an explicit C 1 parametric curve in the polar *** introduce the curvilinear coordinate,in which the irregular star-shaped domain is converted to a regular semi-infinite *** equations of linear elasticity are discretized with respect to the angular variable and we solve the resulting semidiscrete approximation analytically using a direct *** eigenvalues of the semi-discrete approximation converge quickly to the true eigenvalues of the elliptic operator,which helps capture the singularities ***,an optimal error estimate of our method is *** the inverse elasticity problems,we determine the Lam´e coefficients from measurement data by minimizing a regularized energy *** apply the direct method of lines as the forward solver in order to cope with the irregularity of the domain and possible singularities in the forward *** numerical examples are presented to show the effectiveness and accuracy of our method for both forward and inverse elasticity problems of composite materials.

关键词： composite materials linear elasticity problems inverse elasticity problems starshaped domains method of lines

Synthesis and analysis of new humidity-controlling composite materials

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International Journal of Minerals,Metallurgy and materials 2017年第5期24卷 594-602页

作者： Jian-li Shang Zhi-fang Zong Hao Zhang College of materials and Mineral Resources Xi’an University of Architecture and TechnologyXi’an 710055China

Gypsum is a traditional building material. To improve the humidity-controlling properties of gypsum, we prepared a new type of humidity-controlling composite using the sol-gel method. Methods to determine the maximum equilibrium moisture content and speed of adsorption/desorption were subsequently applied to analyze the performance of the samples. The appearance and structural properties of the samples were characterized by scanning electronic microscopy (SEM). The experimental results show that the humidity-controlling gel with added LiCl exhibits high moisture storage and that the equilibrium maximum moisture content is 5.652 g/g at a 75.29% relative humidity (RH). A mass ratio of LiCl/sol = 0.15 is demonstrated to be appropriate for the preparation of the new humidity-controlling composites. A coarse network with tiny pores is observed on the surface of the new humidity-controlling composites, and this pore network provides sufficient space for moisture adsorption.

关键词： composite materials gypsum humidity control sol-gel processing adsorption desorption

A two-scale method for identifying mechanical parameters of composite materials with periodic configuration

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Acta Mechanica Sinica 2006年第6期22卷 581-594页

作者： J.Z. Cui X.G. Yu Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 10080 China

In this paper, a two-scale method （TSM） is presented for identifying the mechanics parameters such as stiffness and strength of composite materials with small periodic configuration. Firstly, a formulation is briefly given for two-scale analysis （TSA） of the composite materials. And then a two-scale computation formulation of strains and stresses is developed by displacement solution with orthotropic material coefficients for three kinds of such composites structures, i.e., the tension column with a square cross section, the bending cantilever with a rectangular cross section and the torsion column with a circle cross section. The strength formulas for the three kinds of structures are derived and the TSM procedure is discussed. Finally the numerical results of stiffness and strength are presented and compared with experimental data. It shows that the TSM method in this paper is feasible and valid for predicting both the stiffness and the strength of the composite materials with periodic configuration.

关键词： Two-scale method Stiffness Strength composite materials Small periodic configuration

Effects of Far-Infrared composite materials Doped with Rare Earth on Physicochemical Properties of Diesel Fuel

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Journal of Rare Earths 2005年第S1期23卷 178-181页

作者：王丽娟许刚科孟军平梁金生梁广川 Institute of Power Source and Ecomaterials Science Hebei University of Technology Tianjin 300130 China

The rare earth, far-infrared natural mineral and clay were compounded to prepare the far-infrared composite materials. The effects of the far-infrared composite materials on the physicochemical properties of diesel fuel were studied. It shows that the composite materials can radiate higher intensity of far infrared; and the surface tension, viscosity and flash point decrease when the diesel fuel is dealt with the composite materials containing rare earth elements; and then the available effect mechanisms of the composite materials on the properties of diesel fuel were investigated by testing the activity changes of arene.

关键词： composite materials far infrared diesel fuel physicochemical property mineral rare earths