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《Journal of Functional Materials》 2013-24
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Preparation of tantalum oxide aerogels by two-stepacid and basic catalyst method

REN Da-hua;YANG Rui-zhuang;LUO Xuan;FANG Yu;HUANG Chuan-qun;ZHANG Qing-jun;CHEN Shu-fan;CHENG Xin-lu;WU Wei-dong;Science and Technology on Plasma Physics Laboratory,Research Center of Laser Fusion;Institute of Atomic and Molecular Physics,Sichuan University;  
Ta2O5 aerogels were prepared by sol-gel process and supercritical drying technique.The sol gel process mainly consisted of hydrolysis and condensation reaction was controlled by two-step catalyst.Ta2O5aerogels prepared with two-step acid and basic catalyst method show rigidity,translucence and low constriction in comparision with one-step acid catalyst method.The resulting aerogels were characterized by means of BET and SEM.It was found that Ta2 O5 aerogels have a higher inner surface of 493m2/g and more porous structure with two-step acid and basic catalyst method than one-step acid catalyst method.According to the non-local density functional theory(NLDFT),the pore width distribution was from 2to 8nm with two-step acid and basic catalyst method rather than from 2to 20nm with one-step acid catalyst method.SEM shows that a mount of nanoparticles randomly constructed consist of typical amorphous and mesoporous aerogels.The catalysis mechanisms of acid and basic for sol gel process are discussed initially.
【Fund】: 中国工程物理研究院发展基金资助项目(2010B0302047)
【CateGory Index】: TL632
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