کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9635795 1427488 2005 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preparation of silica aerogel from rice hull ash by supercritical carbon dioxide drying
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Preparation of silica aerogel from rice hull ash by supercritical carbon dioxide drying
چکیده انگلیسی
Silica aerogel, which is a mesoporous light solid material, was prepared from the rice hull ash by sol-gel followed supercritical carbon dioxide drying. The rice hull ash, which is rich in silica, was extracted using sodium hydroxide solution to produce a sodium silicate solution. The solution was neutralized with sulfuric acid solution to form a silica gel. After washing with water and the solvent exchange with ethanol, the aged gel was dried to produce aerogel using supercritical carbon dioxide drying. The prepared silica aerogel was characterized using SEM, TEM and BET measurements. The specific surface area of the rice hull ash aerogel was as high as 597.7 m2/g with a bulk density of 38.0 kg/m3. The diameters of the pores inside the aerogel are between 10 and 60 nm.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Supercritical Fluids - Volume 35, Issue 1, August 2005, Pages 91-94
نویسندگان
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