- Synthesis of novel chitaline-silica aerogels with spontaneous Au and Ag nanoparticles formation in aerogels matrix
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- 论文类型： 期刊论文
- 发表时间： 2013-05-01
- 发表刊物： MICROPOROUS AND MESOPOROUS MATERIALS
- 收录刊物： SCIE、EI
- 卷号： 171
- 页面范围： 147-155
- ISSN号： 1387-1811
- 关键字： Aerogel composites; Mesoporous materials; Sol-gel growth; Nanoparticles; Microstructure
- 摘要： A composite of a silica aerogel and a copolymer of chitosan and polyaniline (chitaline) with Au or Ag nanoparticles was prepared by a surfactant-free sol-gel process. By grafting polyaniline on the chitosan backbones, the copolymer chitaline was synthesized, which is soluble in aqueous solution. It can be combined with silica gels to form aerogel composites, the specific surface areas of chitaline/silica aerogels are over 650 m(2)/g, with densities low to 0.09 g/cm(3). Upon protonic doping, the chitaline/silica aerogels conductivity rises from less than 10(-8) to 10(-4) S/cm. This kind of chitaline possesses primary amines in the backbone structure that can bind metal ions, and the reduction potential of chitaline was tested lower to 0.735 V, which can easily reduce high potential ions such as Au(III) and Ag(I) to form nanostructured metal particles. And the reduced nanoparticles were observed homogenously dispersed in the aerogels. (C) 2013 Elsevier Inc. All rights reserved,
