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Dynamics and Disorder in Surfactant-Templated Silicate Layers Studied by Solid-State NMR Dephasing Times and Correlated Line Shapes
- Source :
- Journal of Physical Chemistry C, Journal of Physical Chemistry C, American Chemical Society, 2008, 112 (25), pp.9145-9154. ⟨10.1021/jp711398h⟩, Journal of Physical Chemistry C, 2008, 112 (25), pp.9145-9154. ⟨10.1021/jp711398h⟩
- Publication Year :
- 2008
- Publisher :
- HAL CCSD, 2008.
-
Abstract
- 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.
- Subjects :
- 010405 organic chemistry
Carbon-13 NMR satellite
Dephasing
Relaxation (NMR)
010402 general chemistry
01 natural sciences
Silicate
0104 chemical sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry
chemistry.chemical_compound
Crystallography
General Energy
chemistry
Solid-state nuclear magnetic resonance
Pulmonary surfactant
Chemical physics
Physical and Theoretical Chemistry
Spectroscopy
ComputingMilieux_MISCELLANEOUS
Line (formation)
Subjects
Details
- Language :
- English
- ISSN :
- 19327447 and 19327455
- Database :
- OpenAIRE
- Journal :
- Journal of Physical Chemistry C, Journal of Physical Chemistry C, American Chemical Society, 2008, 112 (25), pp.9145-9154. ⟨10.1021/jp711398h⟩, Journal of Physical Chemistry C, 2008, 112 (25), pp.9145-9154. ⟨10.1021/jp711398h⟩
- Accession number :
- edsair.doi.dedup.....68fc03a4f813f01bca00432527dec55d
- Full Text :
- https://doi.org/10.1021/jp711398h⟩