Differential Selective Etching of Functional Groups Strategy for Preparation of Organic Hollow Porous Silica

¹ School of Urban Construction, Wuchang Institute of Technology, 430065 Wuhan, China
² School of Food and Biological Engineering, Hubei University of Technology, 430068 Wuhan, China

^* Corresponding author: 544966911@qq.com

Abstract

In this study, different structural of organic hollow porous silica were prepared based on differential selective etching of functional groups strategy, using ammonia as catalyst, cetyltrimethylammonium bromide (CTAB) as pore-forming agent and emulsifier, cyano silica (CN-SiO₂) or vinyl silica (V-SiO₂) formed by hydrolysis condensation of 2-cyanoethyl triethoxysilane (CTES) or vinyl triethoxysilane (VTES) were used as cores, NH-SiO2 prepared by 3-aminopropyl triethoxysilane (APTES), SH-SiO₂ prepared by mercaptopropyl trimethoxysilane (MPTMS) and UD-SiO₂ prepared by urea-propyl triethoxysilane (UPTES) as shells, separately. The morphology and structure of the products were characterized by scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The study results showed that CN-SiO₂ as core was considered to be benefit for the preparation of organic hollow porous silica compared to V-SiO₂ as core. In addition, core-shell structure obtained from CN-SiO₂NH-SiO₂ tend to be changed into hollow porous structure in alkaline condition on account of differential selective etching of functional groups strategy.