MECHANISM OF SILICA NANO-PLATE FORMATION FROM LUCENTITE
N. H. TRAN
M. A. WILSON
A. S. MILEV
G. R. DENNIS
G. S. K. KANNANGARA
The mechanism of formation of silica nano-plates by exfoliation of a phyllosilicate magnesium containing clay, Lucentite, in an aqueous solution of poly(acrylic acid) has been studied. Fourier transform infrared spectroscopy and Mg K-edge near edge X-ray adsorption fine structure (NEXAFS) analysis shows that non-surface (bulk) Mg ions were not chemically involved in the poly(acrylic acid)/clay intercalation, but were substantially involved in the exfoliation resulting in the silica nano-plates. During intercalation, O K-edge NEXAFS shows that surface defects were formed which represent additional structural branches on the surface. During exfoliation, these increased significantly. Si L3,2-edge NEXAFS measurements shows that this occurred by migration of SiO4 groups within the exfoliated silica plates.
Phyllosilicate clay, Lucentite, silica nano-plate, intercalation, exfoliation, Fourier transform infrared spectroscopy, near edge X-ray adsorption fine structure
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