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Two-dimensional silicon nanomaterials for optoelectronics

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Journal of Semiconductors 2023年第4期44卷 15-29页

作者： Xuebiao Deng huai chen Zhenyu Yang MOE Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional MaterialsSchool of ChemistrySun Yat-sen UniversityGuangzhou 510275China

Silicon nanomaterials have been of immense interest in the last few decades due to their remarkable optoelectronic responses,elemental abundance,and higher ***-dimensional silicon is one of the new allotropes of silicon and has many compelling properties such as quantum-confined photoluminescence,high charge carrier mobilities,anisotropic electronic and magnetic response,and non-linear optical *** review summarizes the recent advances in the synthesis of two-dimensional silicon nanomaterials with a range of structures(silicene,silicane,and multilayered silicon),surface ligand engineering,and corresponding optoelectronic applications.

关键词： two-dimensionality silicon nanomaterials synthesis surface engineering optoelectronics

Recent progress in structural modulation of metal nanomaterials for electrocatalytic CO_(2) reduction

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Rare Metals 2021年第6期40卷 1412-1430页

作者： chen-huai Yang Farhat Nosheen Zhi-cheng Zhang Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin University&Collaborative Innovation Center of Chemical Science and EngineeringTianjin 300072China Department of Chemistry Division of Science and TechnologyUniversity of EducationLahore 54660Pakistan

The electrochemical CO_(2) reduction(ECR)into value-added products presents an appealing approach to mitigate CO_(2) emission caused by excess consumption of fossil *** obtain high catalytic activity and selectivity toward target product in ECR,designing and developing a stable and efficient electrocatalyst is of significant *** date,metal nanomaterials have been widely applied as electrocatalysts for ECR due to their unique physicochemical *** structural modulation of metal nanomaterials is an attractive strategy to improve the catalytic *** this review,the recent progress of structural modulation,including size,facet,grain boundary,composition,interface,ligand modification,and crystal phase,is systematically summarized from both theoretical and experimental ***,the opportunities and perspectives of structural modulation of metal nanomaterials for ECR are proposed.

关键词： CO_(2)reduction Structural modulation Electrocatalysis Metal nanomaterial Crystal phase

Weighted Composition Operators of H~∞ intoα-Bloch Spaces on the Unit Ball

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Acta Mathematica Sinica,English Series 2009年第2期25卷 265-278页

作者： Min Zhu ZHANG huai Hui chen Department of Mathematics Southeast University Nanjing 210096 P. R. China Department of Mathematics Nanjing Normal University Nanjing 210097 P. R. China

In this paper we characterize the boundedness and compactness of weighted composition operators of H∞ into α-Bloch spaces on the unit ball in C^n.

关键词： H∞ space α-Bloch space weighted composition operator boundedness compactness

Equivalent Characterizations of α-Bloch Functions on the Unit Ball

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Acta Mathematica Sinica,English Series 2011年第12期27卷 2395-2408页

作者： Min Zhu ZHANG huai Hui chen Department of Mathematics Southeast University Nanjing 210096 P. R. China Department of Mathematics Nanjing Normal University Nanjing 210097 P. R. China

In this paper we establish equivalent characterizations of α-Bloch functions on the unit ball without use of derivative, which generalize and improve the results of Nowak, Zhao, Wulan and Li.

关键词： α-Bloch function unit ball Bergman metric

Structural Damage Recognition Based on Perturbations of Curvature Mode Shape and Frequency

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Acta Mechanica Solida Sinica 2018年第6期31卷 794-803页

作者： Rong He Yafei Zhu Wei He huai chen School of Civil Engineering and Communication North China University of Water Resource and Electric PowerZhengzhou 450046China School of Civil Engineering Shangqiu UniversityShangqiu 476000China School of Civil Engineering Zhengzhou UniversityZhengzhou 450001China

A new method for structural damage identification is presented based on perturbations of curvature mode shape and ***,the structure's mass and stiffness matrices are expressed as functions of its elements'physical parameters,which reflect their damage states. According to differences in the curvature mode shape of the structure in undamaged and damaged states,possible damage equations and determined damage equations are established and used to solve for the elements'damage ***,to ensure the accuracy of the recognition result,a reasonable solution is substituted into a damage-checking equation based on the change of frequency of the damaged *** examples are used to show that,to identify the damage,only one order mode needs to be *** the degree of damage is low, first-order perturbation equations can be used to recognize the damage with sufficient accuracy. If the extent of the damage is high,second-order perturbation equations can be used to provide more accurate identification results.

关键词： Modal parameters Damage identification Curvature mode shape Frequency Perturbation

Unraveling molecular-level mechanisms of reactive facet of carbon nitride single crystals photocatalyzing overall water splitting

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Rare Metals 2020年第12期39卷 1353-1355页

作者： Cong-Yong Wang chen-huai Yang Zhi-cheng Zhang Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207China Department of Chemistry National University of SingaporeSingapore 117543Singapore Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin University&Collaborative Innovation Center of Chemical Science and EngineeringTianjin 300072China

Despite the reactive facets play a vital role in designing highly efficient photocatalysts,it has long been a tremendous challenge to reveal the principle that reactive facets favor photocatalysis at the molecular ***... 详细信息

关键词： splitting catalysis designing

Reynolds number dependence of flow past a shallow open cavity

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Science China(Technological Sciences) 2014年第11期57卷 2161-2171页

作者： chen huai ZHONG Qiang WANG XingKui LI DanXun State Key Laboratory of Hydroscience and Engineering Tsinghua University

Measurements were carried out in a shallow open cavity with particle image velocimetry *** cavity has a lengthto-depth ratio of 4:1,and the upstream inflow conditions include laminar,transient,and turbulent regimes at seven different Reynolds *** measured instantaneous velocities were analyzed through ensemble average,vortex extraction,and proper orthogonal decomposition(POD)to investigate overall flow circulations,Reynolds stress distribution,spanwise vortex population,and the characteristics of the POD *** results reveal distinctive Reynolds number dependence of the cavity flow,*** increase in Reynolds number results in constant migration of the overall circulation,enhancement of Reynolds stress,reduction of correlation between vortex and Reynolds stress,and decrease of fractional energy of the characteristic POD ***,a phenomenological model was proposed to describe various features of cavity flow.

关键词： cavity flow Reynolds number Reynolds stress spanwise vortex particle image velocimetry

Interaction of Cd and citric acid, EDTA in red soil

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Journal of Environmental Sciences 2001年第2期13卷 153-156页

作者： ZHOU Dong mei WANG Shen-qiang chen huai man Laboratory of Material Cycling in Pedosphere Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China

Adsorption and desorption process of cadmium in red soil (Ferrisols) as well as the influence by media' s pH were investigated in detail with and without citric acid and EDTA. Experimental results clearly showed that Cd adsorption in red soil was affected significantly by the coexisted organic chemicals. In the presence of citric acid and EDTA, Cd adsorption in red soil increased with pH in acid media but decreased in high pH one. Further studies placed stress on the adsorbed Cd in red soil which was found to be existed mainly as exchangeable one at pH < 5.5, and desorption rate by 0.10 mol/L NaNO3 gave a peak-shaped curve due to the difference of specifically and nonspecifically adsorbed Cd with pH's change.

关键词： cadmium interaction organic acid red soil

Cr^(Ⅵ) adsorption on four typical soil colloids: equilibrium and kinetics

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Journal of Environmental Sciences 2000年第3期12卷 325-329页

作者： ZHOU Dong-mei chen huai-man LMCP Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China

It is observed that the adsorption of chromium are greater on kaolinite minerals, red soil (R) and laterite (L) colloids than that on montmorillonite, indicotic black (IB) and yellow brown (YB) soil colloids. The adsorption process of Cr Ⅵ on these media can be further described by Langmuir or Freundlich equation quite well. The adsorption reaction of Cr Ⅵ is fast, and the adsorption equilibrium can be reached within the first two hours in moderate temperature. The adsorption quantity of Cr Ⅵ to kaolinite mineral increased with the increasing pH in the range of 2.0 to 7.0, then decreased at higher pH. But it showed some consistence among the four soil colloids. The lower the pH, the stronger the adsorption. The possible mechanisms are further discussed here. Meanwhile the influence of temperature on Cr Ⅵ adsorption on different soil colloid and clay minerals are also investigated.

关键词： Cr Ⅵ soil colloids clay mineral adsorption