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  4. Dynamics and disorder in surfactant-templated silicate layers studied by solid-state NMR dephasing times and correlated line shapes
 
research article

Dynamics and disorder in surfactant-templated silicate layers studied by solid-state NMR dephasing times and correlated line shapes

Cadars, Sylvian
•
Mifsud, Nicolas
•
Lesage, Anne
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2008
JOURNAL OF PHYSICAL CHEMISTRY C

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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Type
research article
DOI
10.1021/jp711398h
Web of Science ID

WOS:000256920000006

Author(s)
Cadars, Sylvian
Mifsud, Nicolas
Lesage, Anne
Epping, Jan Dirk
Hedin, Niklas
Chmelka, Bradley F.
Emsley, Lyndon  
Date Issued

2008

Publisher

AMER CHEMICAL SOC

Published in
JOURNAL OF PHYSICAL CHEMISTRY C
Volume

112

Issue

25

Start page

9145

End page

9154

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
LRM  
Available on Infoscience
January 8, 2015
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/110053
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