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   超级绝热 在 材料科学 分类中 的翻译结果: 查询用时:0.535秒
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  super thermal insulation
    THE NANOPOROUS SUPER THERMAL INSULATION MATERIAL COMPOUNDED WITH XONOTLITE-SiO_2-AEROGEL
    硬硅钙石—SiO_2复合纳米孔超级绝热材料
短句来源
    Nanoporous Super Thermal Insulation Material Compounded With SiO_2-aerogel
    SiO_2纳米孔超级绝热材料
短句来源
    A. J. fistly proposed the concept of super thermal insulation material in the international engineering meeting in 1992.Nanopore super thermal insulation material has been Silica aerogel as vector of nanopore in home and abroad so far.
    美国学者Hunt.A.J.等在1992年国际材料工程大会上首先提出了超级绝热材料(Super thermal insulation material)的概念。
短句来源
    Preparation and Investigation of Nanoporous Super Thermal Insulation: Silica Aerogels
    纳米孔超级绝热材料气凝胶的制备与热学特性
短句来源
    Nano-porous Super Thermal Insulation Materials Prepared by Water Glass as Silicon Source
    以水玻璃为硅源制备纳米孔超级绝热材料
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  super insulator
    Nano-porous structures and effective thermal conductivity of aerogel super insulator
    超级绝热材料气凝胶的纳米孔结构与有效导热系数
短句来源
    Based on the open-cell nano-porous structure features, a cubic array of intersecting spheres unit cell model describing the coupled conduction of gas and solid in aerogel super insulator was developed. By one-dimensional heat conduction analysis in the unit cell, the effective thermal conductivity expression was obtained.
    根据气凝胶的纳米孔结构特点,采用由小球体构成的立方阵列单元体结构,建立了描述纳米孔超级绝热材料气凝胶的气固耦合导热模型。
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Nano-porous SiO2 aerogel insulations were prepared via two methods: (1) Using tetraethoxysilane (TEOS) as the precursor and followed by ethanol supercritical drying; (2) Surface modification of alcogels prepared from polyethoxydisiloxanes (E40) and followed by drying at ambient pressure. TEM, SEM and pore size distribution techniques were used to characterize the morphology and pore structure of the silica aerogels. The thermal conductivity of the silica aerogels was determined using the transient hot-wire technique....

Nano-porous SiO2 aerogel insulations were prepared via two methods: (1) Using tetraethoxysilane (TEOS) as the precursor and followed by ethanol supercritical drying; (2) Surface modification of alcogels prepared from polyethoxydisiloxanes (E40) and followed by drying at ambient pressure. TEM, SEM and pore size distribution techniques were used to characterize the morphology and pore structure of the silica aerogels. The thermal conductivity of the silica aerogels was determined using the transient hot-wire technique. The results show that the pore size distribution of silica aerogels is from several nanometer to dozens of nanometer, the size of the particles is 5~10 nm and the average pore size (BJH) is about 20 nm and 10 nm respectively for samples derived from the two different methods, while the thermal conductivity of the silica aerogels (100 kg/m3) are 0.0125 and 0.014 W/(m.K) respectively at room temperature and 1.01105 Pa.

以正硅酸四乙酯(TEOS)为硅源,通过溶胶凝胶及超临界干燥过程制备了SiO2气凝胶. 同时,采用相对廉价的多聚硅(E40)为硅源,以三甲基氯硅烷(TMCS)为表面修饰剂,硅油为干燥介质, 在常压条件下制备了同样具有纳米多孔结构的SiO2气凝胶. 用透射电镜、扫描电镜及孔径分布仪对其结构进行了表征,并用动态热线法对其热学特性进行了测试. 结果表明: 两种方法制备的气凝胶均是典型的纳米孔超级绝热材料,后者热导率略高但成本低许多,所以更具应用推广潜力.

The concept of super thermal insulation material originates from early the nineties of the 20th century.Preparation and investigation of nanoporous super thermal insulation material is a new subject in recent years.Along with study on nanomaterial more and more at home and abroad,the study on nanoporous super thermal insulation materila is unceadsingly developing toward practicability and engineering.The status of research,major achievements and further developing in the research of nanoporous super thermal...

The concept of super thermal insulation material originates from early the nineties of the 20th century.Preparation and investigation of nanoporous super thermal insulation material is a new subject in recent years.Along with study on nanomaterial more and more at home and abroad,the study on nanoporous super thermal insulation materila is unceadsingly developing toward practicability and engineering.The status of research,major achievements and further developing in the research of nanoporous super thermal insulation material were reviewed.The concept,mechanism and formation about nanoporous super thermal insulation material were introduced.A tentative idea of preparation and investigation of nanoporous super thermal insulation material compounded with Xonotlite-SiO_2-Aerogel was given.

纳米孔超级绝热材料的概念起源于 2 0世纪 90年代初期 ,但纳米孔超级绝热材料的研制却是近年来提出的新课题。随着纳米材料的研究在国内外的蓬勃开展 ,纳米孔超级绝热材料的研究也不断向实用化和工程化发展。本文综述了纳米孔超级绝热材料的研究现状、主要研究成果和应用前景。介绍了纳米孔超级绝热材料的概念、绝热原理及制备方法 ,提出了硬硅钙石—SiO2 气凝胶复合纳米孔超级绝热材料研制的初步设想。

Nano-porous silica aerogel insulation material are prepared by sol-gel method using cheap price water glass as silicon source. In the preparation of silica aerogel , sodium ion is removed by ion-exchange resin, the surface is modified by trimethylchlorosilane and then is dried at ambient pressure. The morphology and pore structure of the silica aerogels are characterized by SEM and pore size distribution measurement instruments.

采用廉价的水玻璃为硅源,通过溶胶凝胶法,用离子交换树脂除去钠离子,并进行溶剂替换,用三甲基氯硅烷进行表面修饰,采用常压干燥,制备出具有纳米多孔结构的SiO2 超级绝热材料,并用扫描电镜、孔径分布测试仪等对其结构进行表征。

 
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