The Preparation of Alkyltrimethylammonium–Kanemite Complexes and Their Conversion to Microporous Materials

Abstract

Single layered polysilicate kanemite (NaHSi2O5·3H2O) was allowed to react with alkyltrimethylammonium chloride solutions to form alkyltrimethylammonium–kanemite complexes. During the organic intercalation, the SiO2 layers in the complexes were condensed to form three-dimensional SiO2 networks. The calcined products of the complexes had micro pores 2–4 nm in diameter, and the surface areas were ca. 900 m2g−1. The pore size of the calcined products was altered with the variation in the alkyl-chain length of the alkyltrimethylammonium ions employed.

3D design of self-assembled nanoporous colloids

“…where σ is the surface tension constant, n r is a unit vector of the director-field of the nematic crystal, and K 1,2,3 are the elastic modulae, that denote splay, twist, and bend deformations, respectively. Let us consider a fiber-type shape.…”

“…With the discovery of the liquid crystal templating (see, e.g., [1,2], a review [3] and other references cited there) of hexagonal, cubic and lamellar nano(meso)structured silica, materials science has moved into the area of design and synthesis of inorganics with complex form. It is possible to synthesize inorganics with structural features of a few nanometers and architectures over rather large length scales, up to hundreds of microns.…”

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

“…Since the first reports of mesoporous silica prepared using surfactants in the early 1990 s [1][2][3], ordered mesoporous silica has attracted great attention because of its structural 6 Present address: Department of Civil and Environmental Engineering, Indian Institute of Technology (IIT), Kanpur, India. features, such as tunable mesopores, high surface area, large adsorption capacity and ordered pore arrangement [4][5][6][7]. In general, mesoporous structures are constructed using supermolecular assemblies formed through the self-organization of amphiphilic molecules as structure-directing agents.…”

Adsorption of Mono-, Di-, Tri- and Tetra-Glycine by Mesoporous Materials FSM-16

“…[1] When a surfactant was intercalated into an interlayer of kanemite, the surfactant formed micelles between the interlayers. The shape of the micelle for the surfactant remained by the polymerization of silicate.…”

“…The characteristics of FSM-16 were investigated sufficiently. [1][2][3][4][5] For example, the pore size of FSM-16 is about 3 nm, the surface area is about 1000 m2/g, adsorption of water vapor by FSM-16 has been investigated, and the structure of FSM46 seldom collapsed by water, etc. The mesoporous material was expected to utilize a molecular sieve or a catalyst.…”