Molecular dynamics above the smectic A-isotropic phase transition of thermotropic liquid crystals studied by NMR

Autor:	Rodolfo H. Acosta, Daniel J. Pusiol, F. Vaca Chávez
Rok vydání:	2004
Předmět:	Condensed Matter::Soft Condensed Matter Larmor precession Molecular dynamics Phase transition Condensed matter physics Proton Field cycling Chemistry Isotropy General Physics and Astronomy Physical and Theoretical Chemistry Thermotropic crystal
Zdroj:	Chemical Physics Letters. 392:403-408
ISSN:	0009-2614
DOI:	10.1016/j.cplett.2004.05.055
Popis:	This Letter presents a proton fast field cycling Nuclear Magnetic Resonance study of the molecular dynamics in the region above the smectic A-isotropic phase transition in thermotropic liquid crystals. The proton spin-lattice relaxation time was measured as a function of temperature at different Larmor frequencies and the experimental results were interpreted in term of the Landau De Gennes theory. Mechanisms provided by both individual reorientational fluctuations and fluctuations of the local order parameter can be distinguished at the different Larmor frequency scales.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::68a37f242cad69bfc2b681c0907262c6 https://doi.org/10.1016/j.cplett.2004.05.055 Zobrazit plný text záznamu Full Text from ScienceDirect