کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5441363 1510385 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preparation of hierarchically mesoporous silica monolith using two components of poly(ethylene glycol) as cooperative dual-templates
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Preparation of hierarchically mesoporous silica monolith using two components of poly(ethylene glycol) as cooperative dual-templates
چکیده انگلیسی
In this work, two components of poly(ethylene glycol) (PEG) are used as dual-templates for facile and cost-effective preparation of hierarchically mesoporous silica monoliths (HMSMs) with controllable mesostructures and co-continuous macrostructures from low-toxicity tetraethoxysilane. The influence of different preparative parameters on the porous structures was studied, including the proportions of PEGs and acidity. The typical HMSM (PEG-1.5/0.5) with skeleton mesopore size of 6.3 nm, skeleton thickness of 1.25 μm and macropores of 1.87 μm can be obtained. The total pore volume and high surface area reach 711 m2 g− 1 and 3.37 cm3 g− 1 (including mesopore volume of 0.93 cm3 g− 1), respectively. The PEG400 and PEG35k are proved to play cooperative roles as dual-templates in harnessing the mesoporous skeletons and co-continuous macrostructures. Interestingly, in such preparation system, the use of PEG400 is found to be play key role in inducing the formation of skeletons with relatively large mesopores, while the amount of PEG35k is a more sensitive factor in shaping the macroporous structures. This work is believed to open a new path to engineering the macroporous and mesoporous structures via the TEOS/PEG/HCl(aq.) synthesis system.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 461, 1 April 2017, Pages 80-86
نویسندگان
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