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Dynamics and disorder in surfactant-templated silicate layers studied by solid-state NMR dephasing times and correlated line shapes
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2008 (English)In: Journal of Physical Chemistry C, ISSN 1932-7447, Vol. 112, no 25, 9145-9154 p.Article in journal (Refereed) Published
Abstract [en]

Surfactant-templated layered silicates are shown to possess complex compositional, structural, and dynamic features that manifest rich and interrelated order and disorder at molecular length scales. Temperature-dependent 1D and 2D solid-state Si-29 NMR measurements reveal a chemical-exchange process involving the surfactant headgroups that is concomitant with reversible broadening of Si-29 NMR line shapes under magic-angle-spinning (MAS) conditions at temperatures in the range 205-330 K. Specifically, the temperature-dependent changes in the Si-29 transverse dephasing times T-2' can be quantitatively accounted for by 2-fold reorientational dynamics of the surfactant headgroups. Variable-temperature analyses demonstrate that the temperature-dependent Si-29 shifts, peak broadening, and 2D Si-29{Si-29} correlation NMR line shapes are directly related to the freezing of the surfactant headgroup dynamics, which results in local structural disorder within the silicate framework.

Place, publisher, year, edition, pages
2008. Vol. 112, no 25, 9145-9154 p.
Keyword [en]
Magnetic-Resonance, Correlation Spectra, Mesoporous Solids, Bridging Oxygen, Spin-System, Spectroscopy, Relaxation, Sequence
URN: urn:nbn:se:su:diva-15701DOI: doi:10.1021/jp711398hOAI: diva2:182221
Available from: 2008-12-08 Created: 2008-12-08 Last updated: 2011-01-10Bibliographically approved

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