Dilute solution routes to various controllable morphologies of MCM-41 silica with a basic medium
Dilute solution routes to various controllable morphologies of MCM-41 silica with a basic medium
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DOI：
10.1021/cm990661z
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发表时间：
2001-02-01
影响因子：
8.6
通讯作者：
Cui, FZ
中科院分区：
文献类型：
--
作者：
Cai, Q;Luo, ZS;Cui, FZ
在一种基本介质中可控地合成了具有多种形态的MCM-41硅颗粒。在353 K的氢氧化钠介质中，以极低表面活性剂浓度的CTAB与TEOS反应制得平均粒径为110 nm的纳米球形二氧化硅MCM-41，在氨水中合成了直径0.3 ~ 0.6 μ m、长度为1 μ m的亚微米级二氧化硅棒和直径约为1 μ m的微米级扁平二氧化硅，通过改变溶剂含量来控制粒径和形貌。提出了一种基于自组装硅酸盐表面活性剂棒状胶束沉积的形态形成机制，并很好地解释了形态的可控性。
MCM-41 silica particles with several morphologies have been controllably synthesized with a basic medium. Nanospherical MCM-41 silica with an average size of 110 nm was produced through reaction of extremely low surfactant concentrations of CTAB with TEOS in the sodium hydroxide medium at 353 K, while a submicrometer-sized silica rod, 0.3-0.6 mum in diameter and 1 mum in length, and micrometer-sized oblate silica with nominal diameter around 1 mum were synthesized in aqueous ammonia, where the size and the morphology were controlled by varing the content of the solvent. A morphogenetic mechanism that is based on the deposition of self-assembled silicate surfactant rodlike micelles is proposed and explains well the controllability of the morphology.