Dynamics and Disorder in Surfactant-Templated Silicate Layers Studied by Solid-State NMR Dephasing Times and Correlated Line Shapes | Zendy

Sylvian Cadars | Zendy; Nicolas Mifsud | Zendy; Anne Lesage | Zendy; Jan Dirk Epping | Zendy; Niklas Hedin | Zendy; Bradley F. Chmelka | Zendy; Lyndon Emsley | Zendy

Open Access

Dynamics and Disorder in Surfactant-Templated Silicate Layers Studied by Solid-State NMR Dephasing Times and Correlated Line Shapes

Author(s) -

Sylvian Cadars,

Nicolas Mifsud,

Anne Lesage,

Jan Dirk Epping,

Niklas Hedin,

Bradley F. Chmelka,

Lyndon Emsley

Publication year - 2008

Publication title -

the journal of physical chemistry c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.401

H-Index - 289

eISSN - 1932-7455

pISSN - 1932-7447

DOI - 10.1021/jp711398h

Subject(s) - dephasing , pulmonary surfactant , chemistry , silicate , solid state nuclear magnetic resonance , magic angle spinning , molecular dynamics , line (geometry) , atmospheric temperature range , chemical physics , nmr spectra database , nuclear magnetic resonance spectroscopy , spectral line , crystallography , nuclear magnetic resonance , thermodynamics , computational chemistry , stereochemistry , organic chemistry , condensed matter physics , physics , biochemistry , geometry , mathematics , astronomy

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.

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