Free-standing and bridged amine-functionalized periodic mesoporous organosilica films

Abstract

In this work, we report the first successful synthesis of free-standing and bridged amine-functionalized PMO films grown at the air-water interface using 1,2-bis(triethoxysilyl) ethane (BTEE) and bis[(3-trimethoxysilyl) propyl] amine (BTMSPA) as silica sources and cationic alkyltrimethylammonium surfactant as the structure-directing agent. The films with thickness from 50 to 380 nm had a highly ordered periodic mesostructure with a two-dimensional (2D) hexagonal closed-packed arrangement of channels running parallel to the surface. The typical pore diameter and surface area of the film after solvent-extraction were 28.9 angstrom and 630 m(2) g(-1), respectively, when the film was synthesized at 95 degrees C for 8 h with the reaction composition of 1.0 BTEE : 0.05 BTMSPA : 0.57 C(16)TABr : 2.28 NaOH : 336 H(2)O. (29)Si and (13)C cross polarization (CP) MAS NMR spectra identified that the organic-inorganic moieties (Si-CH(2)-CH(2)-Si and Si-(CH(2))(3)NH(CH(2))(3)-Si) are the basic structural unit in the film.