Control of secondary pore dimension of bimodal mesoporous silicas prepared from CTAOH and Brij mixed template

摘要

We prepared a series of bimodal mesoporous silicas (BMSs) using a mixed template system. Cetyl-trimethylammonium hydroxide (CTAOH) and varying concentrations nonionic auxiliary templates, including Brij76, Brij72, Brij52, and Brij30, were employed as templates. These mixed template syntheses led to BMS materials with two different length scales of mesopores. The small mesopore was thought to be generated by the CTA~+ template, while the secondary large pore was produced by the auxiliary template. Depending on the chemical structure of the auxiliary template, the dimensions of the secondary large pore had systematically changed.