Mechanism of exfoliation of clays

Nguyen H. Tran, Michael A. Wilson, Adriyan S. Milev, Gary R. Dennis, Kamali Kannangara, Robert N. Lamb

    Research output: Chapter in Book / Conference PaperConference Paper

    Abstract

    ![CDATA[The exfoliated structures of lamellar clays offer potentials as precursor for formation of nano-structured materials. We explored the Synchrotron Radiation soft X-ray techniques and nuclear magnetic resonance to study the exfoliation of phyllosilicate clays by polymers. Experiments were carried out in dispersions containing approximately 1% weight phyllosilicate in 5% aqueous solution of poly(acrylic acid) at different temperatures. The clays were exfoliated as the reaction was performed at 85��C. X-ray photoemission spectroscopy indicated that the exfoliated structures were consisted of virtually pure silica nano-plates. 29Si nuclear magnetic resonance and oxygen K-edge near edge X-ray absorption fine structure indicated that the surface of the plates was terminated by high concentrations of the silanol groups, which created structural branches. The formation of the branches created a steric effect that inhibited the stacking of the plates, which eventually resulted in the exfoliation.]]
    Original languageEnglish
    Title of host publicationSynchrotron Radiation Instrumentation: Ninth International Conference on Synchrotron Radiation Instrumentation, Daegu, Korea, 28 May-2 June 2006 : SRI 2006
    PublisherAmerican Institute of Physics
    Number of pages4
    ISBN (Print)9780735403734
    Publication statusPublished - 2007
    EventInternational Conference on Synchrotron Radiation Instrumentation -
    Duration: 1 Jan 2007 → …

    Conference

    ConferenceInternational Conference on Synchrotron Radiation Instrumentation
    Period1/01/07 → …

    Keywords

    • clay
    • phyllosilicates
    • exfoliation
    • nuclear magnetic resonance
    • synchrotron radiation
    • polymers

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