PMOS逻辑
介孔有机硅
三乙氧基硅烷
材料科学
多孔性
介孔材料
水解
化学工程
胶束
冷凝
扩散
纳米技术
介孔二氧化硅
化学
有机化学
催化作用
复合材料
工程类
电压
晶体管
水溶液
物理
热力学
量子力学
作者
Mathilde Laird,Carole Carcel,E. Oliviero,Guillaume Toquer,Philippe Trens,John R. Bartlett,Michel Wong Chi Man
标识
DOI:10.1016/j.micromeso.2020.110042
摘要
Periodic mesoporous organosilicas (PMOs) are obtained by the hydrolysis-condensation of organobridged triethoxysilane precursors in the presence of surfactants as structure-directing agents (SDAs). After removal of the SDAs, the resulting materials usually exhibit monomodal, well-organized mesoporosity, with the size of the pores being controlled by the SDA. However, despite the potential technological applications of such materials with well-organized bimodal porosity, to the best of our knowledge, PMOs exhibiting two distinct types of ordered mesoporosity have barely been described. Herein, we describe a simple approach for modulating the dimensions of ordered monomodal 2D hexagonal and bimodal porosity in PMOs synthesized from 1,4-bis(triethoxysilyl)benzene (BTEB) and Pluronic P123 under acidic conditions, by varying the addition sequence of reactants. The approach employs a single SDA without degradation of the BTEB precursor. Reaction conditions leading to the formation of monomodal and bimodal porosity within the templated PMOs are identified. Our approach exploits the competition between the rates of (a) BTEB hydrolysis/condensation; and (b) diffusion, solubilization and partitioning of the unhydrolyzed and hydrolyzed precursor within the micelles. A mechanism describing the evolution of porosity within this system is proposed.
科研通智能强力驱动
Strongly Powered by AbleSci AI