Controlling and measuring conformational properties of n-alkane ultraconfined in urea: A high-pressure NMR studyC. Odin and J. C. Ameline
Groupe Matière Condensée et Matériaux, UMR6626 au CNRS, Université Rennes I Campus de Beaulieu, 35042 Rennes Cedex, France firstname.lastname@example.org
(Received 24 November 2003; accepted in final form 2 March 2004)
high-resolution solid-state NMR experiments were performed on the intergrowth compound /urea at ambient temperature and helium pressure up to 4500 in a home-made NMR probe. These experiments show that the populations of chain ends gauche conformers can be reversibly modified with pressure. The trans-gauche volume change , free-energy change as well as the contribution of the conformational defects to the chain spring constant were estimated for the first time for an ultraconfined n-alkane.
68.65.-k - Low-dimensional, mesoscopic, and nanoscale systems: structure and nonelectronic properties.
76.60.-k - Nuclear magnetic resonance and relaxation.
36.20.Ey - Conformation (statistics and dynamics).
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