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Ultra-sensitive graphene strain sensor for sound signal acquisition and recognition

Nano Research 2015年第5期8卷 1627-1636页

作者： Yan Wang Tingting Yang Junchao Lao Rujing Zhang Yangyang Zhang Miao Zhu Xiao Li Xiaobei Zang Kunlin Wang Wenjian YU Hu Jin Li Wang Hongwei Zhu Department of Physics and Institute for Advanced Study Nanchang University Nanchang 330031 China Center for Nano and Micro Mechanics Tsinghua University Beijing 100084 China School of Materials Science and Engineering State Key Laboratory of New Ceramics and Fine Processing Key Laboratory ot Materials Processing Technology of MOE Tsinghua University Beijing 100084 China Department of ComputerScience and Technology Tsinghua University Beijing 100084 China 2D Carbon Graphene Material Co. Ltd. Changzhou 213149 China

A wearable and high-precision sensor for sound signal acquisition and recognition was fabricated from thin films of specially designed graphene woven fabrics （GWFs）. Upon being stretched, a high density of random cracks appears in the network, which decreases the current pathways, thereby increasing the resistance. Therefore, the film could act as a strain sensor on the human throat in order to measure one＇s speech through muscle movement, regardless of whether or not a sound is produced. The ultra-high sensitivity allows for the realization of rapid and low-frequency speech sampling by extracting the signature characteristics of sound waves. In this study, representative signals of 26 English letters, typical Chinese characters and tones, and even phrases and sentences were tested, revealing obvious and characteristic changes in resistance. Furthermore, resistance changes of the graphene sensor responded perfectly with pre-recorded sounds. By combining artificial intelligence with digital signal processing, we expect that, in the future, this graphene sensor will be able to successfully negotiate complex acoustic systems and large quantities of audio data.

关键词： graphene strain sensors sound detectors high sensitivity

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Phase and Size Controlled Synthesis of ZnS Nanoparticles at Low Temperatures

Phase and Size Controlled Synthesis of ZnS Nanoparticles at ...

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2016中国国际功能材料大会(CIFM 2016)暨第九届中国功能材料及其应用学术会议(9th NCFMA)

作者： Feng Huo Yushu Wang Feng Yang Jin-Fang Xi Long-Sheng Zou Si-Si Xie Yuan Pu School of Chemistry and Chemical Engineering Analytical Testing CenterNeijiang Normal University School of Materials Science and Engineering Georgia Institute of Technology Superconductivity and New Energy R&D Center Key Laboratory of Advanced Technology of Materials (Ministry of Education of China)Mail Stop 165 State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology

We report a simple solution for the synthesis of phase and size controlled Zn S nanoparticles at low *** S nanoparticles of cubic form（c-ZnS）,as well as hexagonal form（h-ZnS）,were obtained by heating an aqueous solution of Zn（NO）·6HO and NaSO·5HO at different *** the system was heated at 65°C for 24 h,crystal phase of ZnS nanoparticles obtained was assigned to the

关键词： ZnS Phase and Size Controlled Synthesis of ZnS Nanoparticles at Low Temperatures

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Improving the electroconductivity and mechanical properties of cellulosic paper with multi-walled carbon nanotube/polyaniline nanocomposites

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Journal of Bioresources and Bioproducts 2016年第1期1卷 48-54页

作者： Xiaochuang Shen Yanjun Tang Dingding Zhou Junhua Zhang Daliang Guo Gustavo Friederichs Key Laboratory of Advanced Textile Materials and Manufacturing Technology Ministry of EducationZhejiang Sci-Tech UniversityHangzhou 310018China Key Lab of Pulp and Paper Science&Technology of Ministry of Education Qilu University of TechnologyJinan 250353China Department of Chemical Engineering&Limerick Pulp and Paper Centre University of New BrunswickFrederictonNew BrunswickCanadaE3B 5A3 Department of Forestry Santa Catarina State UniversityLages-SCZip Code 88.523-000Brazil

Cellulose is the most abundant renewable polymer in the nature,and cellulosic paper is widely used in our daily *** electroconductivity to cellulosic paper would allow this conventional material to hold great promise for a wide range of energy-related *** the present work,multi-walled carbon nanotube(MWCNT)/polyaniline(PANI)nanocomposites were synthesized via in situ oxidation polymerization process and characterized by FT-IR and ***,the application of the synthesized MWCNT/PANI nanocomposites as a wet-end filler for the production of electro-conductive paper was demonstrated/*** showed that the cellulosic paper was imparted with an electro-conductivity of up to 0.14 S·m^(-1) while exhibiting a pronounced improvement in mechanical properties as a function of the added MWCNT/PANI nanocomposites.

关键词： Carbon nano tubes Polyaniline Nanocomposites Oxidative polymerization Wet-lay process Cellulosic paper electro-conductivity Mechanical strength

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Gas sensing capabilities of TiO_(2) porous nanoceramics prepared through premature sintering

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Journal of advanced Ceramics 2015年第2期4卷 152-157页

作者： Yao XIONG Zilong TANG Yu WANG Yongming HU Haoshuang GU Yuanzhi LI Helen Lai Wah CHAN Wanping CHEN Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education and School of Physics and Technology Wuhan UniversityWuhan 430072China School of Materials Science and Engineering State Key Laboratory of New Ceramics and Fine ProcessingTsinghua UniversityBeijing 100084China Department of Applied Physics and Materials Research Centre The Hong Kong Polytechnic UniversityHong KongChina Faculty of Physics and Electronic Technology Hubei UniversityWuhan 430062China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China

Pure and noble metal(Pt,Pd,and Au)doped TiO_(2)nanoceramics have been prepared from TiO_(2)nanoparticles through traditional pressing and *** those samples sintered at 550℃,a typical premature sintering occurred,which led to the formation of a highly porous microstructure with a Brunauer-Emmett-Teller(BET)specific surface area of 23 m^(2)/*** room temperature,only Pt-doped samples showed obvious response to hydrogen,with sensitivities as high as~500 for 1000 ppm H_(2)in N_(2);at 300℃,all samples showed obvious responses to CO,while the responses of noble metal doped samples were much higher than that of the undoped *** mechanism for the observed sensing capabilities has been discussed,in which the catalytic effect of Pt for hydrogen is believed responsible for the room-temperature hydrogen sensing capabilities,and the absence of glass frit as commonly used in commercial thick-film metal oxide gas sensors is related to the high *** is proposed that much attention should be paid to metal oxide porous nanoceramics in developing gas sensors with high sensitivities and low working temperatures.

关键词： TiO_(2) porous nanoceramics premature sintering sensors hydrogen CO

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Regeneration of the absorbent by the PTFE hollow fiber membranes using vacuum membrane regeneration technology 13th

Regeneration of the absorbent by the PTFE hollow fiber membr...

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13th International Wool Research Conference, IWRC 2015 and AATCC Sustainability Symposium, AATCC-SS 2015

作者： Wang, Kun Wang, Feng Guo, Yuhai Tang, Hongyan Zhang, Huapeng National Local Joint Engineering Laboratory of Textile Fiber Material and Processing Technology Zhejiang Sci-Tech University Hangzhou310018 China Key Laboratory of Advanced Textile Materials and Manufacturing Technology Ministry of Education Zhejiang Sci-Tech University Hangzhou310018 China

ISBN: (纸本)9783038355724

The polytetrafluoroethylene (PTFE) hollow fiber membranes were prepared through a cold pressing method including paste extruding, stretching and sintering in this study. Membrane vacuum regeneration technology (MVR) was developed as a novel regeneration technology for regeneration of the absorbent. The membrane structures of the PTFE hollow fiber membranes were investigated. The mixture of N-methyldiethanolamine and piperazine was selected as the absorbent. The PTFE hollow fiber membranes were used for regeneration through vacuum membrane regeneration technology. The CO2 regeneration flux and regeneration ratio increased with the increase of the regeneration temperature and the CO2 loading. The regeneration pressure was negative to the regeneration flux and regeneration ratio. When the flow rate of the rich solution increased, the regeneration ratio decreased and CO2 regeneration flux increased significantly. © (2016) Trans Tech Publications, Switzerland.

关键词： Carbon dioxide

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CO2 desorption by hydrophilic PTFE hollow fiber membranes via a membrane flash process 13th

CO2 desorption by hydrophilic PTFE hollow fiber membranes vi...

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13th International Wool Research Conference, IWRC 2015 and AATCC Sustainability Symposium, AATCC-SS 2015

作者： Lv, Pengpeng Wang, Feng Guo, Yuhai Tang, Hongyan National Local Joint Engineering Laboratory of Textile Fiber Material and Processing Technology Zhejiang Sci-Tech University Hangzhou310018 China Key Laboratory of Advanced Textile Materials and Manufacturing Technology Ministry of Education Zhejiang Sci-Tech University Hangzhou310018 China

ISBN: (纸本)9783038355724

In this study, hydrophilic PTFE hollow fiber membranes were prepared and applied for CO2 desorption via a membrane flash process, which is a new CO2 desorption process by utilizing waste thermal energy. The methyldiethanolamine was selected as the absorbent. Effects of the flashing temperature, flashing pressure, rich solution flow rate and MDEA concentration on CO2 release ratio and CO2 desorption flux were deeply investigated. The results show that flashing temperature is positive to the CO2 release ratio and CO2 desorption flux. However, the flashing pressure, rich solution flow rate and MDEA concentration are negative to the CO2 release ratio and CO2 desorption flux. © (2016) Trans Tech Publications, Switzerland.

关键词： Desorption

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A Metal–Organic Compound as Cathode Material with Superhigh Capacity Achieved by Reversible Cationic and Anionic Redox Chemistry for High‐Energy Sodium‐Ion Batteries

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Angewandte Chemie 2017年第24期129卷

作者： Chun Fang Ying Huang Lixia Yuan Yaojun Liu Weilun Chen Yangyang Huang Kongyao Chen Jiantao Han Qingju Liu Yunhui Huang State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan Hubei 430074 China School of Materials Science and Engineering Yunnan University Kunming Yunnan 650091 China Dongguan McNair New Power Co. Ltd Guangdong 523800 China

Although sodium‐ion batteries (SIBs) are considered as alternatives to lithium‐ion batteries (LIBs), the electrochemical performances, in particular the energy density, are much lower than LIBs. A metal–organic compound, cuprous 7,7,8,8‐tetracyanoquinodimethane (CuTCNQ), is presented as a new kind of cathode material for SIBs. It consists of both cationic (Cu II ↔Cu I ) and anionic (TCNQ 0 ↔TCNQ − ↔ TCNQ 2− ) reversible redox reactions, delivering a discharge capacity as high as 255 mAh g −1 at a current density of 20 mA g −1 . The synergistic effect of both redox‐active metal cations and organic anions brings an electrochemical transfer of multiple electrons. The transformation of cupric ions to cuprous ions occurs at near 3.80 V vs. Na + /Na, while the full reduction of TCNQ 0 to TCNQ − happens at 3.00–3.30 V. The remarkably high voltage is attributed to the strong inductive effect of the four cyano groups.

关键词： Elektronentransfer Kathodenmaterialien Metall-organische Verbindungen Redoxchemie UV/Vis-Spektroskopie

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Corrigendum to"Effects of compatibility of deproteinized antler cancellous bone with various bioactive factors on their osteogenic potential" [Biomaterials 34 (2013) 9103-9114]

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Biomaterials 2018年 170卷 136页

作者： Xuehui Zhang Mingming Xu Lin Song Yan Wei Yuanhua Lin Wentao Liu Boon C Heng Hui Peng Ying Wang Xuliang Deng Department of Geriatric Dentistry Peking University School and Hospital of Stomatology Beijing 100081 PR China State Key Laboratory of New Ceramics and Fine Processing and Department of Materials Science and Engineering Tsinghua University Beijing 100084 PR China. Department of Geriatric Dentistry Peking University School and Hospital of Stomatology Beijing 100081 PR China. Department of Periodontics School of Stomatology Capital Medical University Beijing 100050 PR China. Key Laboratory of Zoonosis Ministry of Education Institute of Zoonosis College of Veterinary Medicine Jilin University Changchun 130062 PR China. Department of Biosystems Science & Engineering (D-BSSE) ETH-Zurich Mattenstrasse 26 Basel 4058 Switzerland. National Engineering Laboratory for Digital and Material Technology of Stomatology Beijing 100081 PR China. Electronic address: kqdengxuliang@***.

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Flow-induced voltage generation in graphene network

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Nano Research 2015年第8期8卷 2467-2473页

作者： Junchao Lao Yijia He Xiao Li FuzhangWu Tingting Yang Miao Zhu Yangyang Zhang Pengzhan Sun Zhen Zhen Baochang Cheng Hongwei Zhu Institute for Advanced Study Nanchang University Nanchang 330031 China Center for Nano and Micro Mechanics Tsinghua University Beijing 100084 China School of Materials Science and Engineering State Key Laboratory of New Ceramics and Fine Processing Tsinghua University Beijing 100084 China

We report a voltage generator based on a graphene network （GN）. In response to the movement of a droplet of ionic solution over a GN strip, a voltage of several hundred millivolts is observed under ambient conditions. In the voltage-generation process, the unique structure of GN plays an important role in improving the rate of electron transfer. Given their excellent mechanical properties, GNs may find applications for harvesting vibrational energy in various places such as raincoats, umbrellas, windows, and other surfaces that are exposed to rain.

关键词： graphene flow ionic solution energy-harvesting

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Enhanced Piezoelectric Properties and Thermal Stability in the (K0.5Na0.5)NbO3:ZnO Lead-Free Piezoelectric Composites

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Journal of the American Ceramic Society 2015年第12期98卷 3935-3941页

作者： Pan, Zhao Chen, Jun Fan, Longlong Zhang, Ji Zhang, Shantao Huang, Yu Liu, Laijun Fang, Liang Xing, Xianran Department of Physical Chemistry University of Science and Technology Beijing Beijing100083 China Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials Beijing100083 China National Laboratory of Solid State Microstructures Department of Materials Science and Engineering Nanjing University Nanjing210093 China Key Laboratory of New Processing Technology for Nonferrous Metals and Materials Ministry of Education Guilin University of Technology Guilin541004 China

The piezoelectric properties of (K0.5Na0.5)NbO3 (KNN) are normally enhanced by chemical substitutions or doping to form solid solutions. In this study, we report that the piezoelectric properties of KNN and thermal stability of piezoelectric coefficient d33 can be both enhanced by forming the composite of KNN:ZnO. The d33 of KNN:0.2ZnO can be improved to 110 pC/N by introducing the ZnO nanoparticles, which is better than the pure KNN (d33 = 85 pC/N). The Curie temperature (TC = 407C) remains well comparable to the pure KNN (TC = 408C). Furthermore, the thermal stability of both remanent polarization (Pr) and piezoelectric parameter (d33) is improved. The enhanced thermal stability could be related to the induced built-in electric field or the enhanced sinterability by the addition of ZnO. The present results may help to optimize the piezoelectric properties of lead-free materials by forming composite. © 2015 The American Ceramic Society.

关键词： Thermodynamic stability

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