Design of silicate nanostructures by interlayer alkoxysilylation of layered silicates (magadiite and kenyaite) and subsequent hydrolysis of alkoxy groups
Design of silicate nanostructures by interlayer alkoxysilylation of layered silicates (magadiite and kenyaite) and subsequent hydrolysis of alkoxy groups
复制标题
DOI：
10.1039/b514157e
复制
发表时间：
2006-02-01
影响因子：
3.3
通讯作者：
Kuroda, K
中科院分区：
文献类型：
--
作者：
Mochizuki, D;Kuroda, K
二氧化硅纳米结构是通过层状硅酸盐（麦羟硅钠石和水羟硅钠石）与烷氧基三氯硅烷的层间烷氧基硅烷化和随后的烷氧基水解来精确设计的。烷氧基三氯硅烷[（RO）ClSiCl_2]的二氯硅基与层状硅酸盐表面相邻的两个Si-OH基团反应形成桥，桥上留下两个功能基团（Si-OR和Si-Cl）。剩余的双官能团几乎完全水解转化为Si-OH基团。根据水解溶剂的不同，麦羟硅钠石的水解产物通过层间硅烷醇基团的缩合形成新的三维硅酸盐结构，或者通过保持固定在硅酸盐层两侧的孪晶Si-OH基团形成新的二维硅酸盐结构。三维硅酸盐结构具有微孔性（130 m（2）g（-1））和亲水性。另一方面，来自水羟硅钠石的水解产物仅具有2-D硅酸盐结构，即使当用于水解的溶剂完全蒸发时。
Silica nanostructures are sophisticatedly designed by interlayer alkoxysilylation of layered silicates (magadiite and kenyaite) with alkoxytrichlorosilanes and the subsequent hydrolysis of alkoxy groups. The dichlorosilyl groups Of alkoxytrichlorosilanes [(RO)ClSiCl2] were reacted onto two neighboring Si-OH groups On the surface of the layered silicates to form a bridge, leaving two functional (Si-OR and Si-Cl) groups On the bridge. The remaining bifunctional groups were almost completely hydrolyzed to transform into Si-OH groups. Depending oil the solvent for hydrolysis, the hydrolyzed product derived from magadiite forms either a new 3-D silicate structure by condensation of interlayer silanol groups or a new 2-D silicate structure by geminal Si-OH groups remaining immobilized on both sides of the silicate layers. The 3-D silicate structure exhibits microporosity (130 m(2) g(-1)) and hydrophilic behavior. On the other hand, the hydrolyzed product from kenyaite takes only a 2-D silicate structure, even when the solvents for hydrolysis were completely evaporated.