Characterization of the location and interfacial states of gallium in gallium/MCM-41 composites
Resource
Microporous and Mesoporous Materials 79 (1-3): 195-203
Journal
Microporous and Mesoporous Materials
Journal Volume
79
Journal Issue
1-3
Pages
195-203
Date Issued
2005
Author(s)
Abstract
A broad based approach, using nitrogen adsorption, X-ray diffraction, DSC, solid-state NMR and X-ray photoelectron spectroscopy, has been used to characterize a series of Ga/MCM-41 composite materials. Rather than filling the mesochannels of the MCM-41 it is found, through this combination of techniques, that most of the Ga is present in the spaces between the particles of MCM-41. High-angle XRD and 71Ga NMR indicate that at room temperature most of the Ga is in the liquid metal state. 29Si and 1H MAS NMR, and XPS reveal that at the Ga/MCM-41 interface the Ga reacts with silanol groups to form new Ga+ states like SiOGa, or bridging Si(OH)Ga hydroxyls. © 2004 Elsevier Inc. All rights reserved.
Type
journal article