کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5438003 1398180 2017 19 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The relationship between the silica wet-gels relative optical transmittance at 500 nm and structural features of silica aerogels
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
The relationship between the silica wet-gels relative optical transmittance at 500 nm and structural features of silica aerogels
چکیده انگلیسی
Aerogels are usually synthesized from supercritical drying of wet-gels. High quality aerogels are usually characterized with high specific surface area (measured by BET method here) and high degree of polymerization of silicate (characterized by 29Si NMR here). The quality of the aerogels depends highly on the quality of the corresponding wet-gels because the skeletal structure in the wet-gels changes only slightly in the supercritical drying process. Here we present a simple method to predict the quality of the desired silica aerogels before the supercritical drying. We found that the relative optical transmittance of the silica wet-gels at 500 nm had good linear correlation with the specific surface area and the degree of silicate polymerization in the corresponding aerogels. We can assess the quality and screen out the low-quality wet-gels from supercritical drying operation, and greatly reduce the cost for aerogel production.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 43, Issue 14, 1 October 2017, Pages 10668-10672
نویسندگان
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