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Molecular motions in thermotropic liquid crystals studied by NMR spin-lattice relaxation

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dc.creator Zamar R.C.
dc.creator González C.E.
dc.creator Mensio O.
dc.date 1998
dc.date.accessioned 2013-05-29T22:35:45Z
dc.date.available 2013-05-29T22:35:45Z
dc.date.issued 2013-05-30
dc.identifier http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97331998000400007
dc.identifier http://www.doaj.org/doaj?func=openurl&genre=article&issn=01039733&date=1998&volume=28&issue=4&spage=00
dc.identifier.uri http://koha.mediu.edu.my:8181/jspui/handle/123456789/2441
dc.description Nuclear magnetic resonance relaxation experiments with field cycling techniques proved to be a valuable tool for studying molecular motions in liquid crystals, allowing a very broad Larmor frequency variation, sufficient to separate the cooperative motions from the liquidlike molecular diffusion. In new experiments combining NMR field cycling with the Jeener Broekaert order-transfer pulse sequence, it is possible to measure the dipolar order relaxation time (T1D), in addition to the conventional Zeeman relaxation time (T1Z) in a frequency range of several decades. When applying this technique to nematic thermotropic liquid crystals, T1D showed to depend almost exclusively on the order fluctuation of the director mechanism in the whole frequency range. This unique characteristic of T1D makes dipolar order relaxation experiments specially useful for studying the frequency and temperature dependence of the spectral properties of the collective motions.
dc.publisher Sociedade Brasileira de Física
dc.source Brazilian Journal of Physics
dc.title Molecular motions in thermotropic liquid crystals studied by NMR spin-lattice relaxation


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