Novel Mesoporous Materials with a Uniform Distribution of Organic Groups and Inorganic Oxide in Their Frameworks

Abstract

Novel organic−inorganic hybrid mesoporous materials have been synthesized, in which organic and inorganic oxide moieties are distributed homogeneously at the molecular level in the framework, forming a covalently bonded network. They are highly ordered at the mesoscale, with two- and three-dimensional hexagonal symmetries and well-defined external morphologies. Nitrogen adsorption measurements show a uniform pore-size distribution with pore diameters of 31 and 27 Å, and high surface areas of 750 and 1170 m2/g. The synthetic procedure to polymerize the organosilane monomer containing two trialkoxysilyl groups in the presence of surfactant can be applied to the synthesis of a variety of highly ordered organic−inorganic hybrid mesoporous materials.

Synthesis and electronic property of platinum nanowire and nanoparticle in mesoporous silica template

“…Siliceous FSM-16 [9] and organosilica HMM-1 with bridging -CH 2 CH 2 -groups [12,25] were prepared according to the literature methods (pore diameter 3 nm). In typical synthetic procedures, FSM-16 was dried under vacuum (ca.…”

“…Among various preparation techniques of nanowires and nanoparticles, the templates synthesis [6] is one of the promising methods, in which uniform void spaces of porous materials are used as a host to confine wires and particles as a guest [3,7]. Mesoporous silicas such as siliceous FSM-16 [8,9], MCM-41 [10], SBA-15 [11], and organosilica HMM-1 [12] have a two dimensional (2D) hexagonal structure (p6mm symmetry) of 1D-channels less than 10 nm in diameter and a high surface area up to 1000 m 2 g -1 . Therefore, the mesoporous silicas provide great opportunities as a template of nanostructured materials.…”

Aerosol-assisted synthesis of mesoporous organosilica microspheres with controlled organic contents

“…The ethoxy groups were formed during the treatment of the samples with an acidic ethanol to remove the triblock copolymer. The TG analysis of the spray-dried samples (Samples 2 and 3) showed large mass losses in the 400-700 • C range owing to the decomposition of ethane fragments [17]. After calcination at 700 • C, organic fractions, such as ethane groups in the frameworks, were completely removed, and the frameworks were converted to pure silica.…”

“…It has been considered that ordered mesoporous materials are potentially applicable to biosensors, drug-delivery systems and adsorption systems, and in biomedicine on the basis of their structural characteristics [4][5][6][7]. For further functionalization of ordered mesoporous silica, the organic modification of silicate surfaces is vital, and functional organic layers are grafted onto mesopore surfaces [3,[8][9][10][11][12][13][14][15][16][17]. However, such organically functionalized mesoporous silica has unsatisfactory properties because organic moieties cannot be distributed homogeneously on silicate surfaces.…”

“…However, such organically functionalized mesoporous silica has unsatisfactory properties because organic moieties cannot be distributed homogeneously on silicate surfaces. In contrast, organic fragments are dispersed homogeneously in periodic mesoporous organosilica (PMO) [17][18][19][20][21][22]. PMO with embedded organic groups is prepared through the hydrolysis and condensation of bridged silsesquioxanes, such as (R O) 3 Si-R-Si(OR ) 3 (R, R ; organic group).…”