Particle‐Size Control and Surface Structure of the Cubic Mesocaged Material AMS‐8

Abstract

Monodispersed particles of the mesocaged material AMS‐8 have been prepared by using nonionic polymeric cosurfactants to control the particle size. These particles are faceted, porous, and show surface structural characteristics that are typical of cubic AMS‐8 (see picture), as well as an increased adsorption capacity as a result of the formation of intraparticle spaces.

Organically Functionalized Mesoporous Silica by Co‐structure‐Directing Route

“…[ 92 ] GarciaBennett et al synthesized AMS-8 nanoparticles by using C 12 GluA and APES with the addition of a block-copolymer, P123 (EO 20 PO 70 EO 20 ). [ 102 ] P123 under basic conditions at temperatures above its cloud point has shown the effect of controlling the size of the mesoporous particles, which is considered to be achieved by the effective dispersion of the nucleation sites of the mesoporous silicas by P123. We found that the anionic surfactant C 18 GluA easily produces monodisperse mesoporous silica nanospheres, having sizes that are from 50 to 300 nm well controllable by the APS/C 18 GluA ratio.…”

Synthesis of amino group functionalized monodispersed mesoporous silica nanospheres using anionic surfactant

“…Typically, for mesoporous silica nanospheres, amino group functionalization has been obtained by co-condensation of 3-aminopropyltrimethoxysilane with silica source [26][27][28]; carboxylic group functionalization has been achieved by introducing 3-cyanopropyl-trimethoxysilane in the synthesis system and subsequent hydrolysis with sulfuric acid [29]; and the sulfonic acid functionalization has been attained by a similar two-step process involving co-condensation and subsequent oxidation of 3-mercaptopropyltrimethoxysilane [30]. Recently, Garcia-Bennett et al found that mesoporous nanoparticles with AMS-8 type structure (space group Fd-3m) could be prepared by adding nonionic surfactant P123 in the synthesis gel above its cloud point, which disperses the nucleation sites and limits the diffusion of silicate oligomers in the synthesis of the nanospheres [32].…”

“…Various functionalized mesoporous silica nanospheres have been synthesized by post-synthesis and co-condensation methods using cationic surfactant [18,[27][28][29][30][31][32]. Typically, for mesoporous silica nanospheres, amino group functionalization has been obtained by co-condensation of 3-aminopropyltrimethoxysilane with silica source [26][27][28]; carboxylic group functionalization has been achieved by introducing 3-cyanopropyl-trimethoxysilane in the synthesis system and subsequent hydrolysis with sulfuric acid [29]; and the sulfonic acid functionalization has been attained by a similar two-step process involving co-condensation and subsequent oxidation of 3-mercaptopropyltrimethoxysilane [30].…”

Anionic surfactant-templated mesoporous silica (AMS) nano-spheres with radially oriented mesopores

“…This pathway for preparation of mesoporous materials using anionic surfactants is interesting, owing to the novel interaction between the inorganic species and surfactant, as well as the lower cost and toxicity of anionic surfactants than those of the cationic surfactants. This new synthetic route has been proven a successful way to produce a series of novel mesoporous phases, such as lamellar, hexagonal, cubic and disordered mesostructures [30][31][32][33][34][35][36][37].…”