Synthesis of low shrinkage monolith alumina aerogels by surface modification and ambient pressure drying

Micro & nano letters

article

Chi Li¹  Zheng Gong²  Likang Ding¹  Donglai Guo³  Wenbin Hu³ 

[1] School of Materials Science and Engineering, Wuhan University of Technology;FiberHome Technologies Group;Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education, Wuhan University of Technology

关键词: nitrogen;    X-ray diffraction;    mesoporous materials;    adsorption;    thermal stability;    alumina;    drying;    shrinkage;    scanning electron microscopy;    aerogels;    Fourier transform infrared spectra;    crystal morphology;    thermal stability;    thermal shrinkage;    specific surface area;    modified aerogel;    diameter shrinkage;    monolithic mesoporous material;    thermal insulation materials;    low shrinkage monolith alumina aerogels;    surface modification;    low shrinkage alumina aerogel;    inexpensive salt;    tetraethoxysilane modification;    ambient pressure drying process;    pore structure;    surface group;    crystal phase;    thermal properties;    X-ray diffractometer;    nitrogen adsorption test;    silicon atoms;    scanning electron microscopy;    Fourier transform infrared spectra;    crystal morphology;    high-temperature resistance;    heating;    packaging;    temperature 1000.0 degC;    Al2O3;    Si;    N2;   

DOI  :  10.1049/mnl.2018.5077

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

The authors have synthesised a kind of low shrinkage alumina (Al 2 O 3 ) aerogel using an inexpensive salt of aluminium (AlCl 3 ·6H 2 O) via tetraethoxysilane modification and an ambient pressure drying process. The morphology, pore structure, surface group, crystal phase and thermal properties of the Al 2 O 3 aerogel are analysed by X-ray diffractometer, scanning electron microscopy, Fourier transform infrared spectra and nitrogen adsorption test. Further improvement in thermal stability and thermal shrinkage are obtained by incorporation of silicon (Si) atoms during the aerogel preparation. The specific surface area of modified aerogel is 480 m 2 /g and the diameter shrinkage is 8% after drying, and reach 304 m 2 /g and 16.5% after heating at 1000°C. The approach, which is straightforward, inexpensive and safe, can be employed to prepare a monolithic mesoporous material with low shrinkage and high-temperature resistance. This will further promote the potential application of packaging and thermal insulation materials.

【 授权许可】

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