کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5441150 | 1510374 | 2017 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Facile fabrication of superhydrophobic, mechanically strong multifunctional silica-based aerogels at benign temperature
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
We first reported the simultaneous in-situ amine-modification and hydrophobization of a native silica aerogel at the benign temperature of 0 °C for further isocyanate cross-linking, compared with the traditional method at the harsh temperature of â 77 °C. The hydrolysis of tetraethylorthosilicate (TEOS) was slower than that of tetramethoxysilane (TMOS) and each methyltrimethoxysilane (MTMS) monomer had one non-hydrolyzable methyl group. The hydrophobicity of the native silica aerogels could be adjusted by tunning the MTMS/TEOS molar ratio. The 3-aminopropyltriethoxysilane (APTES) was used to provide a flexible linking group in the silica structure, while the amine group in APTES was further used as a reactive site for reacting with the isocyanate. As a result, a lightweight, mechanically strong and porous silica-based composite material was obtained by encapsulating the skeletal framework of amine-modified silica aerogels with isocyanate.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 473, 1 October 2017, Pages 59-63
Journal: Journal of Non-Crystalline Solids - Volume 473, 1 October 2017, Pages 59-63
نویسندگان
Shuaiqiang Li, Hongbo Ren, Jiayi Zhu, Yutie Bi, Yewei Xu, Lin Zhang,