کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5365201 | 1388326 | 2010 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Surface characterization by nitrogen adsorption of silica aerogels synthesized from various Si(OR)4 and Râ³Si(ORâ²)3 precursors
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Surface characterization by nitrogen adsorption of silica aerogels synthesized from various Si(OR)4 and Râ³Si(ORâ²)3 precursors Surface characterization by nitrogen adsorption of silica aerogels synthesized from various Si(OR)4 and Râ³Si(ORâ²)3 precursors](/preview/png/5365201.png)
چکیده انگلیسی
We report the surface characterization by nitrogen adsorption-desorption technique of organically surface-modified silica aerogels. These solids were prepared through a sol-gel process from various combinations of silicon precursors and co-precursors with the aim of obtaining identically modified materials. The silicon precursors are based on four identical hydrolysable alkoxy groups (methoxy or ethoxy) whereas one of the alkoxy groups in the co-precursors is substituted by a non-hydrolysable alkyl group (methyl, ethyl, n-propyl, iso-butyl, n-octyl, vinyl or phenyl). Obtained alcogels were dried under carbon dioxide supercritical conditions and their specific surface area, pore volume, mesoporosity and pore size distribution were investigated. Mesoporous materials exhibiting high specific surface areas and total pore volumes were obtained, revealing a decreasing porosity along with the use of co-precursors having larger side chains.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 257, Issue 1, 15 October 2010, Pages 276-281
Journal: Applied Surface Science - Volume 257, Issue 1, 15 October 2010, Pages 276-281
نویسندگان
Rami Al-Oweini, Houssam El-Rassy,