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Graphene-wrapped multiloculated nickel ferrite:A highly efficient electromagnetic attenuation material for microwave absorbing and green shielding

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Nano Research 2022年第7期15卷 6751-6760页

作者： yuchang wang Lihua Yao Qi Zheng Mao-Sheng Cao School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China School of Mechatronical Engineering Shanxi Datong UniversityDatong 037003China

Dedicating to the exploration of efficient electromagnetic(EM)absorption and electromagnetic interference(EMI)shielding materials is the main strategy to solve the EM radiation *** development of multifunction EM attenuation materials that are compatible together EM absorption and EMI shielding properties is deserved our exploration and ***,the graphenewrapped multiloculated NiFe_(2)O_(4) composites are reported as multifunction EM absorbing and EMI shielding *** conductive networks configurated by the overlapping flexible graphene promote the riched polarization genes,as well as electron transmission paths,and thus optimize the dielectric constant of the ***,the introduction of magnetic NiFe_(2)O_(4) further establishes the magnetic-dielectric synergy *** abundant non-homogeneous interfaces not only generate effective interfacial polarization,also the deliberate multiloculated structure of NiFe_(2)O_(4) strengthens multi-scattering and multi-reflection sites to expand the transmission path of EM *** it turns out,the best impedance matching is matched at a lower filled concentration to achieve the strongest reflection loss value of−48.1 ***,green EMI shielding based on a predominantly EM absorption and dissipation is achieved by an enlargement of the filled concentration,which is helpful to reduce the secondary EM wave reflection pollution to the *** addition,the electrocatalytic properties are further *** graphene-wrapped multiloculated NiFe_(2)O_(4) shows the well electrocatalytic activity as electrocatalysts for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER),which is mainly attributed to the interconnected structures formed by graphene and NiFe_(2)O_(4) *** structural advantages of multiloculated NiFe_(2)O_(4) expose more active sites,which plays an important role in optimizing catalytic *** work provides an excellent jumping-off point

关键词： electromagnetic absorbing green electromagnetic shielding multifunction electromagnetic attenuation material graphenewrapped multiloculated Fe_(2)O_(4) oxygen evolution reaction hydrogen evolution reaction

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Preparation of Carboxymethylcellulose from Waste Paper

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Journal of Wuhan University of Technology(Materials Science) 2021年第4期36卷 562-568页

作者： HE Jie wang Dali LONG Lirong HUANG Yali CUI Chunxiang YI Jiajia YANG Shengyang wang yuchang College of Chemistry and Chemical Engineering Beifang Minzu UniversityTinchuan 750021China Institute of Physical Education Lanzhou City UniversityLanzhou 730070China

We aimed at producing sodium carboxymethylcellulose (CMC) from waste paper *** this etherification,the raw material was waste paper,the cellulose was initially alkalized with NaOH,the etherifying agent was sodium chloroacetate,and the reaction medium was water or *** method provided by us,i e,a method for preparing CMC from waste paper,was environment-friendly,could be easily implemented,and could be conveniently applied to make waste paper efficiently used with high profit,and to expand the range of usable raw materials for CMC *** successfully synthesized CMC and prepared CMC plastic *** practice changes waste into valuables,which is beneficial to our living *** preparation of CMC,one of the crucial factors is appropriate pretreatment of the cellulose from waste *** pretreatment was done with a self-built hydrolysis *** experimentally examined the effects of the mass ratios of reactants,reaction temperature,time,and reaction environment of homogeneous or heterogeneous on CMC *** innovative points of this research could be stated as follows:the reaction activity of cellulose was improved by pre-hydrolysis;synthesizing CMC with cellulose from waste paper changes waste into valuables is beneficial to our living environment;and a freezing treatment for the cellulose-alkali mixture was innovatively *** effects were exhibited by a desired final conversion efficiency.

关键词： CMC cellulose etherification cellulose ether membrane

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Cyanation and cyanomethylation of trimethylammonium salts via electrochemical cleavage of C–N bonds

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Organic Chemistry Frontiers 2022年第5期9卷 1288-1294页

作者： Xianqiang Kong yuchang wang Yiyi Chen Xiaohui Chen Long Lin Zhong-Yan Cao School of Chemical Engineering and Materials Changzhou Institute of TechnologyChangzhou 213032China College of Chemistry Chemical Engineering and BiotechnologyDonghua University2999 North Renmin LuShanghai 201620China College of Chemistry and Chemical Engineering Henan UniversityKaifeng 475004China

We have developed a practical and mild electrochemical protocol for cyanation and cyanomethylation of trimethylammonium salts through a pathway involving C–N bond cleavage without the need for an exter-nal stoichiometric reducing agent or a sacrificial *** reaction employs tosyl cyanide(TsCN)or azido allyl alcohol as the cyanation or cyanomethylation reagent,*** shows high functional group compatibility and can be applied for the cyanation of natural product *** mechanistic studies indicate the involvement of a radical addition pathway.

关键词： salts ammonium cleavage

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Facile carbonaceous microsphere templated synthesis of Co3O4 hollow spheres and their electrochemical performance in supercapacitors

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Nano Research 2013年第2期6卷 87-98页

作者： Hongmei Du Lifang Jiao Qinghong wang Jiaqin Yang Lijing Guo yuchang Si Yijing wang Huatang Yuan Institute of New Energy Material Chemistry Key Laboratory of Advanced Energy Materials Chemistry (MOE) Tianjin Key Lab of Metal and Molecule-based Material Chemistry Nankai University Tianjin 300071 China

Co3O4 hollow spheres assembled from nanoparticles have been successfully synthesized by a one-pot hydrothermal carbonization and calcination method. In this method, carbon spheres obtained through hydrothermal carbonization at a low temperature of 140 ℃ are used as sacrificial templates. The carbonization process was monitored by Fourier transform infrared spectroscopy （FT-IR） and Raman spectroscopy. Both the carbon sphere soft templates and the NH3 released from hexamethylenetetramine play key roles in the formation of these novel hollow structures. The formation of the Co3O4 hollow spheres using hydrothermal carbon spheres as templates can be attributed to the synergetic effect of metal ion adsorption and heterogeneous nucleation of Co（OH）2, which is different from the traditional adsorption theory. The as-obtained Co3O4 hollow microspheres exhibit excellent cycling performance and good rate capacity when used as electrode materials in supercapacitors, which can be attributed to the small particle size of Co3O4 and the sufficient space available to interact with the electrolytes. This facile strategy may be extended to synthesize other metal oxide hollow spheres, which may find application in sensors and catalysts due to their unique structural features.

关键词： hydrothermal carbonization calcination hollow spheres adsorption supercapacitors

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Regulating bifunctional flower-like NiFe_(2)O_(4)/graphene for green EMI shielding and lithium ion storage

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Journal of Materials Science & Technology 2022年第32期127卷 48-60页

作者： Lihua Yao Wenqiang Cao Jianguo Zhao Qi Zheng yuchang wang Shang Jiang Qiliang Pan Jie Song Youqi Zhu Maosheng Cao School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China School of Mechatronical Engineering Shanxi Datong UniversityDatong 037003China Institute of Carbon Materials Science Shanxi Datong UniversityDatong 037009China

Environment and energy are the eternal hot topics in the world,multiloculated microscale materials have attracted great attention in the field of electromagnetic interference(EMI)shielding and lithium ions ***,a novel flower-like NiFe_(2)O_(4)/graphene composite with adjustable structure was fabricated as EMI shielding material and anode material of lithium-ion ***_(2)O_(4)/graphene composite is a potential green EMI shielding *** EMI shielding effectiveness(SE)increases with the increase of graphene content in NiFe_(2)O_(4)/graphene composite,and the total EMI SE of NiFe_(2)O_(4)/graphene with 73.6 wt.%graphene increases from 26.5 to 40.6 d B with the increase of frequency in 2–18 ***,it exhibits long-life and large capacity lithium storage performance at high current *** capacity reaches 732.79 m Ah g^(-1)after 100 cycles at 0.1 A g^(-1),recovering to more than 139%from the minimum capacity *** 300 cycles at 0.5 A g^(-1),the capacity increases to 688.5 mAh g^(-1).The initial capacities at 2 and 5 A g^(-1)are 704.9 and 717.8 mAh g^(-1),and remain 297.9 and 203.2 m Ah g^(-1)after 1000 *** distinguished EMI shielding performance and electrochemical performance are mainly ascribed to the structure regulation of NiFe_(2)O_(4)/graphene composite,as well as the synergistic effect of graphene and NiFe_(2)O_(4).This research opens up infinite opportunities for the application of multifunctional and interdisciplinary materials.

关键词： NiFe_(2)O_(4) Graphene EMI shielding Anode Lithium-ion batteries

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Photo Responsive Silver Nanoparticles Incorporated Liquid Crystalline Elastomer Nanocomposites Based on Surface Plasmon Resonance

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Chemical Research in Chinese Universities 2017年第5期33卷 839-846页

作者： ZHANG Jindi wang Jun ZHAO Lina YANG Wenlong BI Meng wang yuchang NIU Hongyan LI Yuxin wang Binsong GAO Yachen LI Chensha HUANG Xuezhen Key Laboratory of Chemical Engineering Process and Technology for High-eJficiency Conversion School of Chemistry and Material Sciences Heilongfiang University Harbin 150080 P. R. China Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education Heilongliang University Harbin 150080 P. R. China Key Laboratory of Electronics Engineering of College of Heilongjiang Province Heilongl'iang University Harbin 150080 P. R. China Department of Food and Environmental Engineering East University of Heilongl'iang Harbin 150066 P. R. China Department of Applied Science Harbin University of Science and Technology Harbin 150080 P. R. China R & D Department of Silatronix Inc. University of Wisconsin-Madison W153706 USA

We reported a nano-Ag/liquid crystalline elastomer（LCE） nanocomposite by incorporating silver nanopar- ticles into a monodomain polysiloxane-based LCE matrix via a novel experimental protocol. The photo-thermo- mechanical actuation of the LCE matrix was realized via the surface plasmon resonance of silver nanoparticles while converting light into heat. The photoresponsive properties of nano-Ag/LCE nanocomposites were investigated with varying ilhunination intensities and silver nanoparticle doping concentrations（0.04% to 0.2%, mass fraction）. The nano-Ag/LCE nanocomposites show sensitive deformation under irradiation due to their excellent photothermal con- version efficiency, and this photostimulated muscle-like actuation is fully reversible via the on-off behavior of light. Incorporating silver nanoparticles into the LCE matrix also improves the mechanical properties and enhances the load-actuation capability of the material.

关键词： Silver nanoparticle Liquid crystal elastomer Nanocomposite Photo-thermo-mechanical actuation Surface plasmon resonance

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Evolution behavior of phase and performance in Ni-based coating layer based on high temperature thermal field

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China Welding 2020年第4期29卷 25-32页

作者： Qin Jian Huang Junlan Long Weimin Yu Deqing Wu Mingfang wang yuchang State Key Laboratory of Advanced Brazing Filler Metals&Technology Zhengzhou Research Institute of Mechanical Engineering Co.LtdZhengzhou 450001China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Bohai Shipbuilding Heavy Industry Co. LtdHuludao 125000China School of Materials Science and Engineering Jiangsu university of science and technologyZhenjiang 212000China Henan huanghe whirlwind Co. LtdChangge 461500China

Effect of post-welding heat treatment on the microstructure and properties of BNi-2 brazing coating was analyzed. The phase transformation in the heat treatment process was analyzed by high temperature metallographic microscope, scanning electron microscope and X-ray diffraction, and the microhardness after the post heat treatment was tested by microhardness tester. The results show that the microstructure of brazing BNi-2 brazing coating is mainly CrB phase, Ni solid solution phase and eutectic phase of Ni_(3)B and Ni_(3)Si. After brazing,the overall hardness value is higher, generally higher than 510 HV, and the microhardness in some areas is higher than 700 HV. After quenching, the solid solution phase of Ni increased, and the eutectic phase of Ni and Ni_(3)Si decreased, leading to the softening of the brazing coating, the area whose microhardness in the range of 342 HV–454 HV increased. After tempering the brazed coating samples, the eutectic phases of Ni and Ni_(3)Si grew and the hardness recovered, but the overall hardness distribution was still lower than the brazing one. The results of the brazing post-heat treatment test show that the post-welding heat treatment will bring adverse effects on the hardness distribution of the coating, which may affect the wear resistance of the coating.

关键词： brazing coating BNi-2 post welding heat treatment Micro-hardness

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汉代传食制度及相关问题研究补述

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图书与情报 2010年第4期 149-151页

作者：王裕昌甘肃省博物馆甘肃兰州730050

邮传制度是秦汉国家信息和交通管理的重要制度,传食制度是汉代驿置传舍系统对公务人员招待的一种制度,学界多有研究,文章梳理了睡虎地秦简、张家山汉简、悬泉汉简中涉及传食的内容并加以比较,对传食接待等级、传食钱款来源等问题进行了... 详细信息

邮传制度是秦汉国家信息和交通管理的重要制度,传食制度是汉代驿置传舍系统对公务人员招待的一种制度,学界多有研究,文章梳理了睡虎地秦简、张家山汉简、悬泉汉简中涉及传食的内容并加以比较,对传食接待等级、传食钱款来源等问题进行了分析。

关键词：邮传制度汉简文书食物

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IDENTIFICATION OF NONLINEAR PROPERTIES OF AN AIRCRAFT LANDING GEAR SHOCK STRUT

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Chinese Journal of Aeronautics 1994年第3期7卷 188-194页

作者： Zhang Zengchang Zhang Jiangjan(Institute of Vibrationn Engineering Research, Nanjing University of Aeronautics andAstronautics Nanjing , China . 210016) wang yuchang(Chinese Flignt Test Establishmennt , Xi’an, China 710089)

A simple but realistic method for identifying nonlinear stiffness and damp-ing of an air-oil shock strut widely used in aircraft is *** the method a powerseries expansion is used to niodel the nonlinear dynamic properties of the strut. and after introducing new variables lhe nonlinear identitication problem can be reduced to alinear one with unknown linear paranieters. An unbiased, efficient and consistentestimator for the vector of the linear parameters is obtained under conditions of mini-mizing the sum of squared residuals which is assumed to be stationary and uncorrelatedwith the observed *** order and the most effective independent variables in themodel are detennined by the criterion of residual series correlation infonnation entropyand the procedure of best subset regression, respectively. Experiinent demonstrates thatthe results are quite satisfactory, and the method developed is realistic, which can beused to study the dynamic properties of a strut in full detail.

关键词： landing gear shock absorbers nonlinear system properties parameteridentification

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不同组装方式对PCBN物相的影响

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金刚石与磨料磨具工程 2005年第4期25卷 17-19页

作者：石安家张铁臣王裕昌河南黄河旋风股份有限公司河南长葛461500 吉林大学国家超硬材料重点实验室长春130012

PCBN已成为现代切削加工中不可缺少的重要刀具材料,本文使用石墨罐、石墨罐+钼杯、石墨罐+钼杯+NaCl管三种不同的组装方式在UDS-Ⅱ型六面顶液压机上进行PCBN的合成,合成压力用油表压来标示,烧结温度用温度显示仪来监测,控制在1350℃～1... 详细信息

PCBN已成为现代切削加工中不可缺少的重要刀具材料,本文使用石墨罐、石墨罐+钼杯、石墨罐+钼杯+NaCl管三种不同的组装方式在UDS-Ⅱ型六面顶液压机上进行PCBN的合成,合成压力用油表压来标示,烧结温度用温度显示仪来监测,控制在1350℃～1500℃之间,保持该温度5～10 min,三种组装方式的合成条件相同.合成后所得的PCBN片经粗磨、抛光后用于金相及X-ray分析测试.结果表明,在三种组装方式下,PCBN生成主要物相均为CBN相及相关的粘结相,在该合成压力、温度范围内也没有发生CBN→hBN的可逆转化,组织结构、性能无明显差异.为简化组装方式、降低合成成本,同时最大限度的防止杂质进入PCBN,合成组装方式可采用石墨罐+钼杯.

关键词： PCBN 组装方式物相组织结构

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