TY - JOUR
T1 - Characterization of the location and interfacial states of gallium in gallium/MCM-41 composites
AU - Zhang, Weiping
AU - Ratcliffe, Christopher I.
AU - Moudrakovski, Igor L.
AU - Tse, John S.
AU - Mou, Chung Yuan
AU - Ripmeester, John A.
N1 - Funding Information:
We gratefully acknowledge Mr. Gerald Pleizier (ICPET, NRC) for recording the XPS data, and Dr. Gary Enright for useful discussion regarding the PXRD results. This research was made possible by an NRC (Canada)—NSC (Taiwan) Collaborative Research Grant.
PY - 2005/4/1
Y1 - 2005/4/1
N2 - 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.
AB - 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.
KW - Gallium-MCM-41 nano-composites
KW - PXRD
KW - Porosimetry
KW - Solid-state NMR
KW - XPS
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U2 - 10.1016/j.micromeso.2004.11.005
DO - 10.1016/j.micromeso.2004.11.005
M3 - Article
AN - SCOPUS:14744297192
SN - 1387-1811
VL - 79
SP - 195
EP - 203
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
IS - 1-3
ER -