Formation mechanism and surface property of exfoliated silica nano-plates
N Tran; M Wilson; A Milev; G Dennis; G S K Kannangara; N Tran; School of Natural Science, University of Western Sydney, Locked Bag 1797, Penrith South DC 1797, Australia; M Wilson; School of Natural Science, University of Western Sydney, Locked Bag 1797, Penrith South DC 1797, Australia; A Milev; School of Natural Science, University of Western Sydney, Locked Bag 1797, Penrith South DC 1797, Australia; G Dennis; School of Natural Science, University of Western Sydney, Locked Bag 1797, Penrith South DC 1797, Australia; G S K Kannangara; School of Natural Science, University of Western Sydney, Locked Bag 1797, Penrith South DC 1797, Australia
Журнал:
Journal of Physics: Conference Series
Дата:
2008-03-01
Аннотация:
The silica nano-plates formed by exfoliation of the synthetic clay Lucentite in the poly(acrylic acid) aqueous solution has been examined using near edge X-ray adsorption fine structure (NEXAFS). Mg K - edge 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 structural branches on the plate surfaces were formed. During exfoliation, these increased significantly. Si L<sub>3,2</sub> - edge NEXAFS shows this occurred by migration of SiO<sub>4</sub> groups within the exfoliated silica plates.
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