Effect of Benzyltrimethylammonium Ion as a Co‐directing Agent on Phase Transitions in a Nanostructure Silica/Surfactant Composite

Alireza Badiei,Ghodsi Mohammadi Ziarani,Hassan Goldooz

doi:10.1155/2010/395624

Abstract

Effect of benzyltrimethylammonium ion as a co directing agent in phase transition from hexagonal to cubic and lamellar mesophases was studied in the constant pH at 130 °C. This phase transformation was carried out in constant surface charge and pore size distribution (2 nm). Influence of BTMA+ ions between head and tail of surfactant and phase transformation were observed by using the XRD and elemental analysis.

Highlights

Order forms of nanoporous materials have been synthesized in a variety of hexagonal, cubic, and lamellar phases through the reaction of inorganic species in the presence of surfactant self-assemblies as supramolecular templates[1]
The solid state transformation from MCM-41 to MCM-48 and MCM-50 was recently studied by transmission electron microscopy (TEM) and scanning electron microscopy (SEM) methods[19]
The XRD patterns of calcined MTS48 h indicated that the (211) reflection was shifted to the high angle and the nanostructure cubic phase was stable after removal of the surfactant

Summary

Introduction

Order forms of nanoporous materials have been synthesized in a variety of hexagonal, cubic, and lamellar phases through the reaction of inorganic species in the presence of surfactant self-assemblies as supramolecular templates[1]. For the first time we reported the effect of benzyltrimethylammonium ion as a co-surfactant for phase transitions from hexagonal to cubic and lamellar. The phase transformation of silica mesophase was observed with the increasing of reaction time of gel according to small angel x-ray diffraction patterns.

Results

Conclusion