Zhou Longping, Hong Guosong, Qi Limin, Lu Yunfeng
Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry, Peking University, Beijing 100871, China.
Langmuir. 2009 Jun 2;25(11):6040-4. doi: 10.1021/la901083u.
Helical mesoporous silica nanofibers with parallel nanochannels were synthesized in high yield via a novel seeding-growth method by using the achiral cationic surfactant cetyltrimethylammonium bromide (CTAB) as template without auxiliary additives. A general entropy-driven model taking into account the icelike structure water due to the hydrophobic effect was proposed to explain the formation of helical mesoporous silica nanofibers. It was indicated that helical silica mesostructures could result from a thick layer of highly ordered icelike water around thin silicate seed rods with a proper concentration, which was verified by the effect of various anions and organic additives on the formation of helical mesoporous silica.
通过一种新颖的种子生长法，以非手性阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）为模板，无需辅助添加剂，高产率地合成了具有平行纳米通道的螺旋介孔二氧化硅纳米纤维。提出了一个考虑到由于疏水作用形成的冰状结构水的通用熵驱动模型，以解释螺旋介孔二氧化硅纳米纤维的形成。结果表明，螺旋二氧化硅介观结构可能源于在适当浓度下围绕细硅酸盐种子棒的一层厚的高度有序的冰状水，各种阴离子和有机添加剂对螺旋介孔二氧化硅形成的影响证实了这一点。
