Field-cycling NMR detection of magnetoacoustically manipulated nematic ordered states: Memory effects

Autor:	Rainer Kimmich, E. Anoardo
Rok vydání:	2007
Předmět:	Condensed Matter::Soft Condensed Matter Larmor precession Proton Condensed matter physics Liquid crystal Chemistry Metastability Dispersion (optics) Phase (waves) General Physics and Astronomy Physical and Theoretical Chemistry Instability Magnetic field
Zdroj:	Chemical Physics Letters. 440:352-356
ISSN:	0009-2614
Popis:	The proton spin–lattice relaxation time ( T 1 ) dispersion was studied under simultaneous sonication in the nematic phase of 5CB. It appears that metastable ordered states subject to a memory effect can be induced by the combined action of an amplitude-modulated ultrasonication and a pulsed magnetic field. We argue that the acoustic amplitude modulation adds instability to the nematic phase through director order fluctuation enhancement. Different manipulated states of the director were unambiguously identified by the Larmor frequency dispersion of T 1 . The field-cycling NMR technique was used for T 1 measurements.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3a2bbe26c15835b20203aab028b5d3ce https://doi.org/10.1016/j.cplett.2007.04.056 Zobrazit plný text záznamu Full Text from ScienceDirect