Abstract
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.
Original language | English |
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Pages (from-to) | 235-239 |
Number of pages | 5 |
Journal | Surface Review and Letters |
Volume | 14 |
Issue number | 2 |
DOIs | |
Publication status | Published - Apr 2007 |
Keywords
- acid
- acrylic
- adsorption
- clay
- ions
- silica