کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1483021 1510492 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hexamethylenetetramine multiple catalysis as a porosity and pore size modifier in carbon cryogels
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Hexamethylenetetramine multiple catalysis as a porosity and pore size modifier in carbon cryogels
چکیده انگلیسی

Hexamethylenetetramine (HMTA) base catalysis is used to control the porosity and pore size of resorcinol furaldehyde cryogels synthesized in tert-butanol. While HMTA produces ammonia and formaldehyde in aqueous media, other carbon–nitrogen molecular units are possible in non-aqueous solvents. The results suggest that at least two paths are possible from this decomposition, a reactive catalyst in pure tert-butanol or a base like catalyst in an aqueous mix. Due to the catalytic effect under high catalysis in tert-butanol the samples promoted high macroporosity > 70%, reduced shrinkage < 20% and had lower syneresis compared to specimens with low concentration of HMTA. On the other hand the use of water mixtures was shown to reduce the mesopore size up to 50%, and reduce the macroporosity to 20%, when compared to the tert-butanol case. Nitrogen physisorption, TEM and FTIR are used to characterize the chemical and structural properties of the cryogels.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 356, Issues 33–34, 15 July 2010, Pages 1620–1625
نویسندگان
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