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Ti3C2Tx Composite Aerogels Enable Pressure Sensors for Dialect Speech Recognition Assisted by Deep Learning 认领 引用 被引量：5
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作者 Yanan Xiao He Li +8 位作者 Tianyi Gu Xiaoteng Jia Shixiang Sun Yong Liu Bin Wang He Tian Peng Sun Fangmeng Liu Geyu Lu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2025年第5期1-15,共15页
Wearable pressure sensors capable of adhering comfortably to the skin hold great promise in sound detection.However,current intelligent speech assistants based on pressure sensors can only recognize standard languages... Wearable pressure sensors capable of adhering comfortably to the skin hold great promise in sound detection.However,current intelligent speech assistants based on pressure sensors can only recognize standard languages,which hampers effective communication for non-standard language people.Here,we prepare an ultralight Ti3C2TxMXene/chitosan/polyvinylidene difluoride composite aerogel with a detection range of 6.25 Pa-1200 k Pa,rapid responseecovery time,and low hysteresis(13.69%).The wearable aerogel pressure sensor can detect speech information through the throat muscle vibrations without any interference,allowing for accurate recognition of six dialects(96.2%accuracy)and seven different words(96.6%accuracy)with the assistance of convolutional neural networks.This work represents a significant step forward in silent speech recognition for human–machine interaction and physiological signal monitoring. 展开更多
关键词 Pressure sensor Wearable sensor Ti3C2Tx composite aerogel Dialect speech recognition
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Scalable Synthesis of Ultrathin Silica Nanosheets for Applications in Thermal-Management Aerogels and Flexible Composite Films 认领 引用
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作者 Qun-Yao Yuan Yuan-Fan Gu +1 位作者 Rong-Rong Cheacharoen Jie Zhao 《Rare Metals》 SCIE EI CAS CSCD 2026年第1期569-579,共11页
Silica nanosheets(SiO2 NSs) hold great promise for advanced thermal protection applications because of their exceptional thermal and chemical stability.However,their development has been hindered by challenges in s... Silica nanosheets(SiO2 NSs) hold great promise for advanced thermal protection applications because of their exceptional thermal and chemical stability.However,their development has been hindered by challenges in scalable synthesis and structural integration for specialized applications.Herein,we report a facile and scalable wet-chemical strategy for producing high-quality and ultrathin SiO2 NSs with lateral dimension more than 5 μm and thickness of ~2 nm.After graphene oxide(GO)-templated thermal treatment,the mechanical stiffness of the SiO2 NSs was significantly enhanced from 60.9 to 76.1 GPa.Leveraging their unique ultrathin and large lateral properties,the ultralight SiO2 NSs aerogel was achieved via a bidirectional freeze-casting technique.The aerogel demonstrates excellent fire resistance and high-temperature tolerance,maintaining its structure upon direct exposure to 1200℃ flames.Furthermore,the integration of SiO2 NSs into a polycaprolactone(PCL) matrix has enabled the development of a large-area and flexible fire-retardant composite film,which exhibits an exceptional flame selfextinguishing time of 2 s and mechanical flexibility.This work offers a scalable platform for fabricating functional SiO2 NSsbased materials and paves the way for their potential application in energy devices,aerospace protection,and flexible electronics. 展开更多
关键词 SiO2aerogels SiO2composite films SiO2nanosheets thermal management
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Preparation and High-temperature Resistance of Fe2O3-SiO2Composite Aerogel Materials 认领 引用
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作者 HOU Jianye ZHANG Zhonglun +2 位作者 FU Xiaoqing WANG Mingming LIU Zhensen 《China's Refractories》 CAS 2025年第4期42-46,共5页
To improve the thermal insulation performance of SiO2aerogels at high temperatures,SiO2precursor solutions were prepared via a sol-gel two-step method.Fe2O3powder was extra added as an opacifier to the SiO... To improve the thermal insulation performance of SiO2aerogels at high temperatures,SiO2precursor solutions were prepared via a sol-gel two-step method.Fe2O3powder was extra added as an opacifier to the SiO2precursor solutions with mass fractions of 0,0.2%,0.5%,1.0%,and 3.0%;and Fe2O3-SiO2composite aerogels were fabricated using CO2supercritical drying technology.The effects of the Fe2O3extra addition on the aerogels were investigated.The results show that:(1)Fe2O3doping does not alter the aerogel morphology;Fe2O3suppresses the mass loss at high temperatures and enhances the high-temperature stability of the composite;(2)below 800℃,the aerogel with 0.5%Fe2O3exhibits the lowest thermal conductivity and the best thermal insulation performance;at 800-1000℃,the aerogel with 1%Fe2O3exhibits the lowest thermal conductivity and a good nanoporous structure;(3)by adjusting the Fe2O3extra addition,composite aerogels suitable for different temperature ranges can be tailored. 展开更多
关键词 Fe2O3-SiO2composite aerogels opacifier pore structure thermal conductivity high temperature performance
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Preparation and Properties of Ti3SiC2-modified High Silica/Phenolic Aerogel Composite 认领 引用
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作者 CAO Wenjing LIU Yiming +4 位作者 ZHAO Dongmei WAN Xiaobo LIU Yang HUANG Kun SHI Minxian 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2025年第6期1563-1571,共9页
A Ti3SiC2-modified high-silica oxygen/phenolic aerogel composite with excellent oxidation resistance and high-temperature performance was prepared.The experimental results show that the obtained composite has si... A Ti3SiC2-modified high-silica oxygen/phenolic aerogel composite with excellent oxidation resistance and high-temperature performance was prepared.The experimental results show that the obtained composite has significantly improved oxidation resistance.When the addition amount of Ti3SiC2is 75%,the carbonization volume shrinkage rate of the composite after aerobic static combustion is only 5.95%.At the same time,the LAR and MAR after 30 seconds of oxyacetylene ablation under a heat flux density of 1.5 MW/m2 are 0.0307 mm/s and 0.0149 g/s,respectively.The compressive strength after aerobic static combustion at 1000℃is up to 20.43%of that before aerobic static combustion,which is 1.99 times that of the unfilled material,significantly improving the high-temperature mechanical properties of the composite. 展开更多
关键词 Ti3SiC2 phenolic aerogel composites high silica fiber thermal conductivity
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Structural Characteristics and Photocatalytic Activity of Ambient Pressure Dried SiO2/TiO2 Aerogel Composites by One-step Solvent Exchange/Surface Modification 认领 引用 被引量：3
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作者 徐海珣 朱平华 +2 位作者 WANG Lijiu JIANG Zuqiang 赵善宇 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第1期80-86,共7页
An ambient pressure synthesis of SiO2/TiO2 binary aerogel was prepared through the low-cost precursors of titanium tetrachloride（TiCl4） and sodium silicate（Na2O·nSiO2）.After gelation,solvent exchange and surf... An ambient pressure synthesis of SiO2/TiO2 binary aerogel was prepared through the low-cost precursors of titanium tetrachloride（TiCl4） and sodium silicate（Na2O·nSiO2）.After gelation,solvent exchange and surface modification were performed simultaneously and the modified gel was finally dried under ambient pressure.Microstructural analyses by transmission electron microscope（TEM） indicate that fabricated SiO2/TiO2 aerogel composite shows similar sponge-like nanostructure as silica aerogel,and the Brunauer-EmmettTeller（BET） analysis shows that the specific surface area of the composite reaches 605 m^2/g,and the average pore size is 9.7 nm.Such binary aerogel exhibits significant photocatalytic performance in this paper for treating model pollutant of methyl orange（MO）,and the decolorizing efficiency of MO is detected as 84.9%after 210 mins exposure to UV light irradiation.Degraded gel suspends in the water so as to separate from solution for reuse,and after 4 times recycling,70%degradation efficiency can be easily reached when composite catalyzed system is exposed for 210 mins under UV irradiation. 展开更多
关键词 photocatalytic activity water glass SiO2/TiO2 binary aerogel ambient drying
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Preparation and Characterization of Alumina-coated Hollow Quartz Fiber Reinforced Al2O3-SiO2 Aerogel Composite 认领 引用 被引量：3
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作者 ZHANG Han LIU Junlong ZHU Shizhen 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2022年第3期324-330,共7页
Al2O3–SiO2sols were synthesized by using aluminum chloride hex hydrate and tetraethoxysilane(TEOS)as precursors,deionized water and ethanol mixture as the solvent,and propylene oxide as the coagulant aids.Al... Al2O3–SiO2sols were synthesized by using aluminum chloride hex hydrate and tetraethoxysilane(TEOS)as precursors,deionized water and ethanol mixture as the solvent,and propylene oxide as the coagulant aids.Alumina coatings were prepared on the surfaces of hollow quartz filament fiber,then a new lightweight and thermal insulating material were successfully prepared by impregnatingAl2O3–SiO2sol into a needle fabric made by coated hollow quartz filament fiber.The coated quartz fiber,aerogels and composites were characterized by Fourier transform infrared spectroscopy(FTIR),X-ray diffraction(XRD),energy dispersive spectroscopy(EDS),nitrogen adsorption-desorption(BET),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and tensile tests.The effects of different fiber and calcination temperatures on the microstructures and properties ofAl2O3–SiO2composite aerogels were investigated.The test results indicate that the mechanical properties of the aerogels are improved by introducing quartz filament fabrics and the introduction of alumina coating improves the thermal stability of the material.Compared to other fibers,Al2O3-coated hollow quartz fiber has significant advantages as reinforcement for composite,and their tensile strength is well retained after high temperature heat treatment. 展开更多
关键词 Al2O3-SiO2aerogel composites hollow quartz fiber thermal insulation property thermal stability
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Surface modification of LiCo0.05Mn1.95O_4 cathode by coating with SiO_2-TiO_2 composite 认领 引用 被引量：1
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作者 禹筱元 胡国荣 +3 位作者 彭忠东 肖劲 陈召勇 刘业翔 《中国有色金属学会会刊：英文版》 2004年第4期723-727,共5页
The cycling characteristics and low specific capacity of LiMn2O4 have always been the greatest obstacle to its commercialization. For the improvement of cyc le performance,the surface of LiCo0.05Mn1.95O4 was coated wi... The cycling characteristics and low specific capacity of LiMn2O4 have always been the greatest obstacle to its commercialization. For the improvement of cyc le performance,the surface of LiCo0.05Mn1.95O4 was coated with ve ry fine SiO2-TiO2 composite prepared by sol-gel method. The structure and morphology of the coating materials were investigated by X-ray diffraction （XRD ） and scanning electron microscope （SEM）. The electrochemical performances of un coated and SiO2-TiO2 coated LiCo0.05Mn1.95O4 spinel at 25 ℃ and 55 ℃ were studied with a voltage range of 3.04.35V and a current density of 0.1 mA/cm2. There is a slight decrease in the initial discharge ca pacity of coated LiCo0.05Mn1.95O4（119 mA·h/g） compared with that of uncoated （123 mA·h/g）. However the cycle ability of LiCo0.05Mn1. 95O4 coated by SiO2-TiO2 is improved. It is proposed that surface treat ment is an effective method to improve the cycle performance of LiCo0.05Mn 1.95O4. The surface modification is successful in minimizing the harmful side reactions within the batteries by placing a protective barrier layer betwe en the oxidizing cathode material and the liquid electrolyte. 展开更多
关键词 SiO2-TiO2 复合涂层 表面改性 LiCo0.05Mn1.95O4 锂离子电池 电极材料
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Preparation of Al_2O_3-SiO_2-TiO_2-ZrO_2 Composite Ceramic Membranes by Sol-Gel Method 认领 引用
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作者 吴建锋 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2005年第1期42-45,共4页
Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO 2(a nat... Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO 2(a natase), Al 2SiO 5, and ZrO 2 in these membranes. Changing the molar ratio of Al∶Si∶Ti∶Zr,the kinds and content of crystal phases of composite membranes could be different, which may lead to a variety of microstructure of membranes. The surface nanoscale topography and microstructure of membranes were investiga ted by XRD,SEM,AFM,EPMA. The effects of additives and heat treatments on the sur face nanoscale topography and microstructure of composite ceramic membranes were also analyzed. 展开更多
关键词 sol-gel method Al 2O 3-SiO 2-TiO 2-ZrO 2 composite ceramic membranes surface nanoscale topography microstructure
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SiO2气凝胶/聚合物复合材料的界面分析与应用研究进展 认领 引用
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作者 李文军 杨哲煜 +4 位作者 徐超 黄龙金 叶静 崔升 郑强 《南京工业大学学报（自然科学版）》 CAS 北大核心 2026年第3期281-291,共11页
气凝胶的高比表面积和孔隙率虽赋予其优异吸附性能和隔热阻燃等特性,但力学强度与柔韧性不足,导致其难以承受动态载荷。将SiO2气凝胶填充到聚合物基体中,制得SiO2气凝胶/聚合物复合材料,可协同提升复合材料的力学强度和隔热阻燃... 气凝胶的高比表面积和孔隙率虽赋予其优异吸附性能和隔热阻燃等特性,但力学强度与柔韧性不足,导致其难以承受动态载荷。将SiO2气凝胶填充到聚合物基体中,制得SiO2气凝胶/聚合物复合材料,可协同提升复合材料的力学强度和隔热阻燃等性能,在这过程中需考虑颗粒团聚和界面相容性等问题。本文聚焦SiO2气凝胶/聚合物复合材料的核心研究方向,综述了SiO2气凝胶表面疏水改性技术、填充过程中的界面结合方式与结合机制、填料参数对复合材料性能的影响,以及该类复合材料在隔热阻燃、降噪吸声、疏水防护等领域的应用进展。最后,结合现有研究不足对未来发展方向进行展望,为该领域的后续研究提供参考。 展开更多
关键词 SiO2气凝胶 聚合物 复合材料 表面改性 阻燃材料 吸声材料 防水材料
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Al2O3-SiO2气凝胶耐高温性能研究进展 认领 引用
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作者 胡心雨 张瑜 +5 位作者 吴永鹏 丁星星 林禹 贺斌 崔阳文 王征辉 《装备环境工程》 CAS 2026年第2期130-139,共10页
概述了Al2O3-SiO2气凝胶耐高温性能研究进展,为Al2O3-SiO2气凝胶的高温性能提升提供研究思路。基于溶胶-凝胶工艺方法,介绍了溶胶、凝胶、老化、干燥等工艺过程对Al2O3-SiO2气凝胶其复合材料性能的影响。通... 概述了Al2O3-SiO2气凝胶耐高温性能研究进展,为Al2O3-SiO2气凝胶的高温性能提升提供研究思路。基于溶胶-凝胶工艺方法,介绍了溶胶、凝胶、老化、干燥等工艺过程对Al2O3-SiO2气凝胶其复合材料性能的影响。通过加强过渡金属、稀土元素、耐高温粒子、分散纤维、纤维预制体与Al2O3-SiO2气凝胶之间的适配性,提出了Al2O3-SiO2气凝胶的耐高温性能提升方法。通过引入锆、钛、钇、碳化硅(SiC)、碳纳米管(CNTs)等粒子,有效改善了Al2O3-SiO2气凝胶孔隙结构与微观形态,抑制高温相变或收缩,增强了Al2O3-SiO2气凝胶高温隔热性能。通过分散纤维、纤维预制体增强方法,同步提升了Al2O3-SiO2气凝胶的力学性能和高温隔热性能,获得了综合性能优异的纤维增强Al2O3-SiO2气凝胶复合材料。针对Al2O3-SiO2气凝胶高温应用场景有限等问题,进一步明确了提升硅铝气凝胶耐高温性能的核心路径。 展开更多
关键词 气凝胶 Al2O3-SiO2 氧化铝 氧化硅 复合材料 耐高温 掺杂改性 纤维增强
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三聚氰胺泡沫-SiO2气凝胶复合材料的制备及其油水分离性能研究 认领 引用
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作者 杨忠 姜洪义 《无机盐工业》 CAS CSCD 北大核心 2026年第4期35-42,共8页
含油废水造成的水污染会对环境和人类健康构成严重威胁。传统SiO2气凝胶因力学性能差、易碎裂、不可循环利用且生产成本高,难以满足油水分离需求。以三聚氰胺泡沫(MF)为骨架支撑材料,采用正硅酸乙酯(TEOS)和甲基三甲氧基硅烷(MTMS)... 含油废水造成的水污染会对环境和人类健康构成严重威胁。传统SiO2气凝胶因力学性能差、易碎裂、不可循环利用且生产成本高,难以满足油水分离需求。以三聚氰胺泡沫(MF)为骨架支撑材料,采用正硅酸乙酯(TEOS)和甲基三甲氧基硅烷(MTMS)为硅源,通过溶胶-凝胶法结合常压干燥法制备MF-SiO2气凝胶复合材料。通过FT-IR、SEM、BET、力学测试和接触角表征方法,研究MF的引入及n(MTMS)(TEOS)对材料孔隙结构、疏水性、力学性能和吸附性能的影响。结果表明:MF显著提升材料的力学性能,使其形成完整块体;当n(MTMS)(TEOS)为2.33时,材料为小孔-中孔双孔型结构,比表面积达769 m2/g、孔体积为2.24 cm3/g,对多种有机物的吸附量为6.43~18.81 g/g,最大应变量达70%,杨氏模量为12 kPa,并可在20次吸附-脱附循环中保持稳定性能。研究结果为开发绿色高效的油水分离材料提供新思路。 展开更多
关键词 SiO2气凝胶 三聚氰胺泡沫 油水分离 复合材料 溶胶-凝胶
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Photocatalytic activity of TiO_2 supported SiO_2-Al_2O_3 aerogels prepared from industrial fly ash 认领 引用 被引量：9
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作者 王慧龙 齐慧萍 +2 位作者 魏晓娜 刘潇彧 姜文凤 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第11期2025-2033,共9页
A ternary composite of TiO2 and a SiO2-Al2O3 aerogel with good photocatalytic activity was prepared by a simple sol-gel method with TiO2 nanoparticles and SiO2-Al2O3 aerogels derived from industrial fly ash.The struct... A ternary composite of TiO2 and a SiO2-Al2O3 aerogel with good photocatalytic activity was prepared by a simple sol-gel method with TiO2 nanoparticles and SiO2-Al2O3 aerogels derived from industrial fly ash.The structural features of the TiO2/SiO2-Al2O3 aerogel composite were investigated by X-ray powder diffraction,Fourier transform infrared spectroscopy,transmission electron microscopy,gas adsorption measurements and diffuse reflectance UV-visible spectroscopy.The optimal conditions for photocatalytic degradation of 2-sec-butyl-4,6-dinitrophenol（DNBP],included an initial DNBP concentration of 0.167 mmol/L at pH = 4.86 with a catalyst concentration of 6 g/L,under visible light irradiation for 5 h.A plausible mechanism is proposed for the photocatalytic degradation of DNBP.Our composite showed higher photocatalytic activity for DNBP degradation than that of pure TiO2.This indicates that this material can serve as an efficient photocatalyst for degradation of hazardous organic pollutants in wastewater. 展开更多
关键词 Titania SiO2-Al2O3 aerogel Composite photocatalyst Industrial fly ash 2-sec-butyl-4 6-dinitrophenol Wastewater treatment
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Preparation of TiO_2/SiO_2 Aerogels by Non-supercritical Drying Method and Their Photocatalytic Activity for Degradation of Pyridine 认领 引用 被引量：11
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作者 甘礼华 王玉栋 +2 位作者 郝志显 徐子颉 陈龙武 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2005年第6期758-763,共6页
TiO2/SiO2 aerogels with different molar ratio of SiO2/TiO2 were prepared via non-supercritical method using tetrabutyl titanate and silica sols as raw materials. The samples were characterized by TEM, SEM, BET, IR, XR... TiO2/SiO2 aerogels with different molar ratio of SiO2/TiO2 were prepared via non-supercritical method using tetrabutyl titanate and silica sols as raw materials. The samples were characterized by TEM, SEM, BET, IR, XRD and so on. The results indicate that the BET surface area of TiO2/SiO2 aerogels calcined at 550℃ which consisted of anatase structure of TiO2 with narrow distribution pores of 5-25 nm is as high as 357.89 m2·g-1. For the photocatalytic degradation of pyridine, the catalytic activities of TiO2/SiO2 aerogels are much higher than that of TiO2 powder. The photocatalytic activity of TiO2/SiO2 aerogels calcined at 800℃ is the optimum. The higher the content of SiO2, the higher the photocatalytic activity of TiO2/SiO2 aerogels. The cost for preparation of the aerogels is greatly reduced by using non-supercritical drying method, and the aerogels are hopefully applied in the treatment of industrial waste water such as coking effluent treatment. 展开更多
关键词 TiO2/SiO2 aerogels photocatalysis pyridine degradation
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Effect of boron doping on waterproof and dielectric properties of polyborosiloxane coating on SiO2f/SiO2 composites 认领 引用 被引量：8
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作者 Long XIA Siru LU +7 位作者 Bo ZHONG Longnan HUANG Hua YANG Tao ZHANG Haibo HAN Pan WANG Li XIONG Guangwu WEN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2019年第8期2017-2027,共11页
A hydrophobic coating of the silica fiber reinforced silica composites(SiO2f/SiO2) was synthesized by sol-gel method using methyltriethoxy-silane(MTES) and boric acid(B(OH)3) as raw materials. The relationship among b... A hydrophobic coating of the silica fiber reinforced silica composites(SiO2f/SiO2) was synthesized by sol-gel method using methyltriethoxy-silane(MTES) and boric acid(B(OH)3) as raw materials. The relationship among boron doping, chemical structure of precursors and durability of hydrophobic coatings was discussed. The Si-O-B and methyl groups were successfully introduced in the gel precursors according to the FT-IR and XPS results. The resins were filled in the internal and surface holes of the SiO2f/SiO2 composites partially or completely, which is beneficial to reduce the physical adsorption of the moisture. In addition, hydroxyl groups of the SiO2f/SiO2 composites reacted with the resins and hydrophobic methyl groups were introduced, leading to the reduction of the chemical adsorption of water. Also, the boron doping was beneficial to enhancing the physical cross-linking between the coating and the SiO2f/SiO2 composites, and improved the adhesion of the coating to the substrate. The results show that the optimal hydrophobic coating with contact angle 130.33°, moisture absorption 0.33% and adhesion level 1 is obtained when the molar ratio of MTES to B(OH)3 is 10:4. The real permittivity of M10B4 is constant in the range of 2.32–2.51 and the dielectric tangent loss is constant in the range of 5.5 × 10-4–8.7 × 10-3. The hydrophobic coating has excellent dielectric properties. 展开更多
关键词 Adhesion Dielectric Hydrophobic Polyborosiloxane SiO2f/SiO2 composites
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Preparation and Adsorption Property of Hydrophobic SiO_2 Aerogels Modif ied by Methyl Triethoxysilane 认领 引用 被引量：5
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作者 CUI Sheng LIN Benlan +3 位作者 LIU Yu SHEN Xiaodong LIU Xueyong HAN Guifan 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第6期1079-1083,共5页
The hydrophobic SiO2 aerogels were prepared by in-situ polymerization sol-gel method and supercritical drying of ethanol method with tetraethylorthosilicate(TEOS)as silica source,methyl triethoxysilane(MTMS)as modifie... The hydrophobic SiO2 aerogels were prepared by in-situ polymerization sol-gel method and supercritical drying of ethanol method with tetraethylorthosilicate(TEOS)as silica source,methyl triethoxysilane(MTMS)as modifier,ethanol as solvent.Moreover,the structure and adsorption property of SiO2 aerogels were also studied.As results,the surface area of SiO2 aerogels was 863.59 m2/g,the pore volume was 3.57 cm3/g,and the contact angle was 150°.Adsorption intensity of silica aerogels for organic liquid(alkanes,benzene compounds,and nitro-compounds)is bigger than that of activated carbon.The mass of the liquid absorbed increased linearly with the surface tension of the liquid.The lower surface tension and boiling point are,the shorter desorption time is.After regenerating 10 times,nitromethane regeneration rate remain the same,and almost more than 94%.So SiO2 aerogels have good absorption and regeneration property. 展开更多
关键词 SiO2 aerogels hydrophobic adsorption intensity adsorption desorption regeneration
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A phase inversion based sponge-like polysulfonamide/SiO_2 composite separator for high performance lithium-ion batteries 认领 引用 被引量：8
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作者 Xiao Wang Gaojie Xu +5 位作者 Qingfu Wang Chenglong Lu Chengzhong Zong Jianjun Zhang Liping Yue Guanglei Cui 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第6期1292-1299,共8页
In this work,a sponge-like polysulfonamide(PSA)/SiO_2 composite membrane is unprecedentedly prepared by the phase inversion method,and successfully demonstrated as a novel separator of lithium-ion batteries(LIBs).Comp... In this work,a sponge-like polysulfonamide(PSA)/SiO_2 composite membrane is unprecedentedly prepared by the phase inversion method,and successfully demonstrated as a novel separator of lithium-ion batteries(LIBs).Compared to the commercial polypropylene(PP) separator,the sponge-like PSA/SiO_2 composite possesses better physical and electrochemical properties,such as higher porosity,ionic conductivity,thermal stability and flame retarding ability.The LiCoO_2/Li half-cells using the sponge-like composite separator demonstrate superior rate capability and cyclability over those using the commercial PP separator.Moreover,the sponge-like composite separator can ensure the normal operation of LiCoO_2/Li half-cell at an extremely high temperature of 90 °C,while the commercial PP separator cannot.All these encouraging results suggest that this phase inversion based sponge-like PSA/SiO_2 composite separator is really a promising separator for high performance LIBs. 展开更多
关键词 Polysulfonamide/SiO2 composite Phase inversion method Separator Performance enhancement Lithium-ion battery
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Laser Cladding Al-Si/Al_2O_3-TiO_2 Composite Coatings on AZ31B Magnesium Alloy 认领 引用 被引量：4
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作者 崔泽琴 YANG Hongwei +2 位作者 王文先 WU Hongliang XU Bingshe 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2012年第6期1042-1047,共6页
To improve the wear resistance and corrosion resistance of magnesium alloys, a 5 kW continuous wave CO2 laser was used to investigate the laser surface cladding on AZ31 B magnesium alloys with Al-Si/Al2O3-TiO2 composi... To improve the wear resistance and corrosion resistance of magnesium alloys, a 5 kW continuous wave CO2 laser was used to investigate the laser surface cladding on AZ31 B magnesium alloys with Al-Si/Al2O3-TiO2 composite powders. A detailed microstructure, chemical composition, and phase analysis of the composite coatings were studied by scanning electron microscopy （SEM）, energy dispersive spectroscopy （EDS）, and X-ray diffraction （XRD）. The laser cladding shows good metallurgical bonding with the substrate. The composite coatings are composed of Mgl7Al12, Al3Mg2, Mg2Si, Al2O3, and TiO2 phases. Compared to the average microhardness （50HV0.05） of the AZ3 1 B substrate, that of the composite coatings （230HV0.05） is improved significantly. The wear resistances of the surface layers were evaluated in detail. The results demonstrate that the wear resistances of the laser surface-modified samples are considerably improved compared to the substrate. It also show that the composite coatings exhibit better corrosion resistance than that of the substrate in 3.5wt% NaCI solution. 展开更多
关键词 AZ31B magnesium alloy laser cladding Al-Si/Al2O3-TiO2 composite coating wear resistance corrosion resistance
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The effects of radiation damage on power VDMOS devices with composite SiO_2-Si_3N_4 films 认领 引用 被引量：3
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作者 高博 刘刚 +5 位作者 王立新 韩郑生 宋李梅 张彦飞 腾瑞 吴海舟 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第3期393-398,共6页
Total dose effects and single event effects on radiation-hardened power vertical double-diffusion metal oxide semiconductor（VDMOS） devices with composite SiO2-Si3N4 film gates are investigated.The relationships amon... Total dose effects and single event effects on radiation-hardened power vertical double-diffusion metal oxide semiconductor（VDMOS） devices with composite SiO2-Si3N4 film gates are investigated.The relationships among the important electrical parameters of the samples with different thickness SiO2-Si3N4 films,such as threshold voltage,breakdown voltage,and on-state resistance in accumulated dose,are discussed.The total dose experiment results show that the breakdown voltage and the on-state resistance barely change with the accumulated dose.However,the relationships between the threshold voltages of the samples and the accumulated dose are more complex,and not only positively drift,but also negatively drift.At the end of the total dose experiment,we select the group of samples which have the smaller threshold voltage shift to carry out the single event effect studies.We find that the samples with appropriate thickness ratio SiO2-Si3N4 films have a good radiation-hardening ability.This method may be useful in solving both the SEGR and the total dose problems with the composite SiO2-Si3N4 films. 展开更多
关键词 power VDMOS device total dose effects single event effects composite SiO2-Si3N4 films
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The influence of ablation products on the ablation resistance of C/C-SiC composites and the growth mechanism of SiO_2 nanowires 认领 引用 被引量：2
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作者 李县辉 燕青芝 +3 位作者 米应映 韩永军 温馨 葛昌纯 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第2期7-11,共5页
Ablation under oxyacetylene torch with heat flux of 4186.8（10%kW/m2 for 20 s was performed to evaluate the ablation resistance of C/C-SiC composites fabricated by chemical vapor infiltration（CVI） combined with liqu... Ablation under oxyacetylene torch with heat flux of 4186.8（10%kW/m2 for 20 s was performed to evaluate the ablation resistance of C/C-SiC composites fabricated by chemical vapor infiltration（CVI） combined with liquid silicon infiltration（LSI） process.The results indicated that C/C-SiC composites present a better ablation resistance than C/C composites without doped SiC.The doped SiC and the ablation products SiO2 derived from it play key roles in ablation process.Bulk quantities of SiO2 nanowires with diameter of 80 nm-150 nm and length of tens microns were observed on the surface of specimens after ablation.The growth mechanism of the SiO_2 nanowires was interpreted with a developed vapor-liquid-solid（VLS） driven by the temperature gradient. 展开更多
关键词 C/C-SiC composites ablation products SiO2 nanowires growth mechanism
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Effect of catalyst on structure of(PEO)_8LiClO_4-SiO_2 composite polymer electrolyte films 认领 引用 被引量：3
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作者 潘春跃 张倩 +2 位作者 冯庆 高金环 赵悠曼 《Journal of Central South University of Technology》 2008年第4期438-442,共5页
(PEO)8LiClO4-SiO2 composite polymer electrolytes(CPEs)were prepared by in-situ reaction,in which ethyl-orthosilicate(TEOS)was catalyzed by HCl and NH3.H2O,respectively.The ionic conductivity,the contact angle and the ... (PEO)8LiClO4-SiO2 composite polymer electrolytes(CPEs)were prepared by in-situ reaction,in which ethyl-orthosilicate(TEOS)was catalyzed by HCl and NH3.H2O,respectively.The ionic conductivity,the contact angle and the morphology of inorganic particles in the CPEs were investigated by AC impedance spectra,contact angle method and TEM.The conductivities of acid-catalyzed CPE and alkali-catalyzed CPE are 2.2×10-5and 1.1×10-5S/cm respectively at 30℃.The results imply that the catalyst plays an important role in the structure of in-situ preparation of SiO2,and influences the surface energy and conductivity of CPE films directly.Meanwhile,the ionic conductivity is related to the surface energy. 展开更多
关键词 PEO（polyethylene oxide） SiO2 composite polymer electrolyte conductivity catalytic reaction
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