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high-porosity Foam-Based Iontronic Pressure Sensor with Superhigh Sensitivity of 9280 kPa^(-1)

Nano-Micro Letters 2022年第2期14卷 12-23页

作者： Qingxian Liu Yuan Liu Junli Shi Zhiguang Liu Quan Wang Chuan Fei Guo School of Astronautics Harbin Institute of TechnologyHarbin 150001HeilongjiangPeople’s Republic of China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongPeople’s Republic of China Department of Civil and Environmental Engineering Shantou UniversityShantou 515063GuangdongPeople’s Republic of China Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA Department of Physics and TcSUH University of HoustonHoustonTX 77204USA Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and TechnologyShenzhen 518055GuangdongPeople’s Republic of China Present Address:320 Crescent Village Circle Unit 1413 San JoseCA 95134USA

Flexible pressure sensors with high sensitivity are desired in the fields of electronic skins,human-machine interfaces,and health monitoring.Employing ionic soft materials with microstructured architectures in the functional layer is an effective way that can enhance the amplitude of capacitance signal due to generated electron double layer and thus improve the sensitivity of capacitive-type pressure sensors.However,the requirement of specific apparatus and the complex fabrication process to build such microstructures lead to high cost and low productivity.Here,we report a simple strategy that uses open-cell polyurethane foams with high porosity as a continuous three-dimensional network skeleton to load with ionic liquid in a one-step soak process,serving as the ionic layer in iontronic pressure sensors.The high porosity(95.4%) of PU-IL composite foam shows a pretty low Young's modulus of 3.4 kPa and good compressibility.A superhigh maximum sensitivity of 9,280 kPa^(-1) in the pressure regime and a high pressure resolution of 0.125% are observed in this foam-based pressure sensor.The device also exhibits remarkable mechanical stability over 5,000 compression-release or bending-release cycles.Such high porosity of composite structure provides a simple,cost-effective and scalable way to fabricate super sensitive pressure sensor,which has prominent capability in applications of water wave detection,underwater vibration sensing,and mechanical fault monitoring.

关键词： high porosity Elastic modulus Compression deformation Iontronic pressure sensor Superhigh sensitivity

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Manufacturing Microporous Foam Zinc Materials with high porosity By Electrodeposition

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Journal of Wuhan University of Technology(Materials Science) 2011年第5期26卷 843-846页

作者：田庆华 School of Metallurgical Science & Engineering Central South University Postdoctoral Ambulatory Station of Metallurgical Engineering Central South University

In order to get foam zinc materials of porous metal electrode,a novel method for preparing foam zinc was proposed,in which the polyurethane foam with diameter of 0.3 mm as substrate was processed by degreasing,roughening,activating,electroless plating and electrodeposition.The main factors affecting the process,such as ZnSO4 content,temperature,pH value,current density,and electrodes distance,were investigated comprehensively.The optimal process conditions are 250 g/L ZnSO4,20 g/L Al2（SO4）3,40 g/L KAl（SO4）2,30 g/L Na2SO4,pH=3.5,4.0 cm of electrodes distance and 0.04 A/cm2 current density at 30 ℃.The result shows that adding ultrasonic on the process can elevate the deepening plating ability and current efficiency.Foam zinc material with a high porosity of 92.2% and a three-dimensional network structure can be fabricated by electrodeposition.

关键词： electrodeposition foam zinc microporous high porosity

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high entropy ultra-high temperature ceramic thermal insulator(Zr_(1/5)Hf_(1/5)Nb_(1/5)Ta_(1/5)Ti_(1/5))C with controlled microstructure and outstanding properties

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Journal of Materials Science & Technology 2022年第24期119卷 190-199页

作者： Zhuojie Shao Zhen Wu Luchao Sun Xianpeng Liang Zhaoping Luo Haikun Chen Junning Li Jingyang Wang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials and Processing TechnologyBeijing 100076China

Due to advancements of hypersonic vehicles,ultra-high temperature thermal insulation materials are urgently requested to shield harsh environment with superhigh heat flux.Toward this target,ultra-high temperature ceramics(UHTCs)are the only choice due to their excellent capability at ultra-high temperatures.We herein report a novel highly porous high entropy(Zr_(1/5)Hf_(1/5)Nb_(1/5)Ta_(1/5)Ti_(1/5))C fabricated by foam-gelcasting-freeze drying technology combined with in-situ pressureless reaction sintering.The porous(Zr_(1/5)Hf_(1/5)Nb_(1/5)Ta_(1/5)Ti_(1/5))C exhibited ultra-high porosity of 86.4%-95.9%,as well as high strength and low thermal conductivity of 0.70–11.77 MPa and 0.164–0.239 W/(m·K),respectively.Specifically,Si C sintering additive only locates at the pit of the surface of sintering neck between UHTC grains,and there is no secondary phase or intergranular film at the grain boundary.Besides,the oxidation resistance of high entropy carbide powders is greatly improved compared with that of the mixed five carbide powders.This work clearly highlights the merits of highly porous high entropy(Zr_(1/5)Hf_(1/5)Nb_(1/5)Ta_(1/5)Ti_(1/5))C as an ultra-high temperature thermal insulation material.

关键词： high entropy UHTCs high porosity high strength Low thermal conductivity Oxidation resistance

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A chemically stable nanoporous coordination polymer with fixed and free Cu^(2+)ions for boosted C_(2)H_(2)/CO_(2)separation

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Nano Research 2021年第2期14卷 546-553页

作者： Si Chen Nibedita Behera Chao Yang Qiubing Dong Baishu Zheng Yingying Li Qi Tang Zhaoxu Wang Yanqing Wang Jingui Duan State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech Universityy Nanjing 211816China Key Laboratory of Theoretical Organic Chemistry and Function Molecule of Ministry of Education Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine PolymersHunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and ConversionSchool of Chemistry and Chemical EngineeringHunan University of Science and TechnologyXiangtan 411201China School of Chemistry and Environmental Engineering Yancheng Teachers UniversityYancheng 224002China

Safely and highly selective acetylene(C_(2)H_(2))capture is a great challenge,because of its highly explosive nature,as well as its nearly similar molecule size and boiling point toward the main impurity of carbon dioxide(CO_(2)).Adsorption separation has shown a promising future.Herein,a new nanoporous coordination polymer(PCP)adsorbent with fixed and free Cu ions(termed NTU-66-Cu)was prepared through post-synthetic approach via cation exchanging from the pristine NTU-66,an anionic framework with new 3,4,6-c topology and two kinds of cages.The NTU-66-Cu shows significantly improved C_(2)H_(2)/CO_(2)selectivity from 6 to 32(v/v:1/1)or 4 to 4_(2)(v/v:1/4)at low pressure under 298 K,along with enhanced C_(2)H_(2)capacity(from 89.22to 111.53 cm^(3)·g^(-1)).More importantly,this observation was further validated by density functional theory(DFT)calculations and breakthrough experiments under continuous and dynamic conditions.Further,the excellent chemical stability enables this adsorbent to achieve recycle C_(2)H_(2)/CO_(2)separation without loss of C_(2)H_(2)capacity.

关键词： nanoporous coordination polymer high porosity new topology post-synthetic approach C_(2)H_(2)/CO_(2)separation

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Effect of Pore Size on Properties of highly Porous Silica Ceramic Foams for Heat Insulation

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China's Refractories 2020年第4期29卷 6-9页

作者： DU Zhongpei YAO Dongxu XIA Yongfeng ZUO Kaihui YIN Jinwei LIANG Hanqin ZENG Yuping State Key Laboratory of high Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

highly porous silica ceramics with different pore sizes were fabricated by adjusting the mixed surfactants addition.The effect of the pore size on the cold compressive strength and the thermal conductivity of the ceramics was researched.The results show that the smaller pore size can improve the compressive strength and the thermal conductivity.With the mixed surfactants addition increasing from 0.1 mass%to 0.4 mass%,the porosity is close,in the range of 88.10%-88.31%,and the average pore size decreases from 190μm to 97μm;the compressive strength is enhanced from 2.97 MPa to 3.55 MPa;and the thermal conductivity decreases from 0.104 W·m-1·K-1 to 0.089 W·m-1·K-1.

关键词： mixed surfactants pore size high porosity silica foams direct foaming thermal conductivity

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