کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
74898 49103 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Using well-defined EOnMAm diblock amphiphilic copolymers as templates for synthesis of mesoporous silicas with different mesostructures
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Using well-defined EOnMAm diblock amphiphilic copolymers as templates for synthesis of mesoporous silicas with different mesostructures
چکیده انگلیسی

Highly ordered mesoporous silicas with large accessible pores have been prepared by using pre-synthesized poly(ethylene oxide)-b-poly(methyl acrlyate) (EOnMAm) diblock copolymers as templates. Via adjusting the chain length of EO versus that of MA, a series of silica mesostructures, including two-dimensional (2-D) hexagonal, 3-D bicontinuous (Ia3d), and body-centered cubic (Im3m) symmetries, were prepared with the use of tetraethyl-orthosilicate (TEOS) as the silica precursor under acidic conditions. The mesostructures of all materials were characterized by small-angle X-ray scattering and transmission electron microscopy measurements. N2 adsorption–desorption isotherms reveal that the pore size ranges from 4 to 30 nm with a narrow pore-size distribution and its dimension is proportional to the chain length of MA units.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 123, Issues 1–3, 1 July 2009, Pages 331–337
نویسندگان
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