Formation mechanism and surface property of exfoliated silica nano-plates

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 po...

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Bibliographic Details
Published in:Journal of physics. Conference series 2008-03, Vol.100 (1), p.012013
Main Authors: Tran, N, Wilson, M, Milev, A, Dennis, G, Kannangara, G S K
Format: Article
Language:English
Subjects:
Acrylics
Aqueous solutions
Clay
Exfoliation
Fine structure
Intercalation
Physics
Plates
Polyacrylic acid
Silicon dioxide
Surface properties
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Summary: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 L3,2 - edge NEXAFS shows this occurred by migration of SiO4 groups within the exfoliated silica plates.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/100/1/012013