Control of mesostructured silica particle morphology

被引:96
作者
Chan, HBS
Budd, PM
Naylor, TD
机构
[1] Univ Manchester, Dept Chem, Manchester M13 9PL, Lancs, England
[2] Smart Chem Co Ltd, Unit 5, Horsham RH13 5QR, W Sussex, England
关键词
D O I
10.1039/b005713o
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The formation of mesostructured silica was investigated using acidic conditions with tetraethoxysilane (TEOS) as the silica precursor and cetyltrimethylammonium bromide (CTAB) as the structure directing agent. A synthesis mixture of composition 2.2TEOS : 1.1CTAB : 75HCl ∶ 1000H(2)O gave a well ordered material exhibiting a range of particle shapes from extended rope-like structures of hexagonal cross-section to gyroid structures. Addition of monomethyltriethoxysilane (MTES) or tetrahydrofuran (THF) to the synthesis mixture gave rise to spherical particles. Studies of particle development showed initial growth of gel-like particles within which the mesostructure developed. A new model is proposed for the formation of mesostructured precipitates in which (1) growth of inorganic oligomers gives rise to a thermodynamically unstable mixture, (2) phase separation occurs giving droplets of a second liquid (or liquid crystal) phase rich in oligomer and surfactant, (3) the droplets are colloidally stabilized, (4) microphase separation occurs within the droplets, giving rise to a mesostructure and (5) further polymerization fixes the mesostructure.
引用
收藏
页码:951 / 957
页数:7
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