Undulations and fluctuations in a lamellar phase lyotropic liquid crystal and their suppression by weak shear flow.

Details

Serval ID
serval:BIB_8A120EF14D81
Type
Article: article from journal or magazin.
Collection
Publications
Title
Undulations and fluctuations in a lamellar phase lyotropic liquid crystal and their suppression by weak shear flow.
Journal
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Author(s)
Lutti A., Callaghan P.T.
ISSN
1539-3755 (Print)
ISSN-L
1539-3755
Publication state
Published
Issued date
2006
Volume
73
Number
1 Pt 1
Pages
011710
Language
english
Notes
Publication types: Journal Article Publication Status: ppublish
Abstract
Using multi-echo pulsed gradient nuclear magnetic resonance (NMR) we measure the anisotropic diffusion of water molecules in the lamellar phase of lyotropic system composed of cetylpyridinium chloride/hexanol diluted in brine. The technique reveals the Fourier spectrum of the molecular velocity autocorrelation function, and its repetitive compensating nature permits effective measurement in the presence of shear flow. We show that under zero shear the phase is highly oriented and that both the amplitude and fluctuation correlation time of lamellar undulations can be measured. The suppression of undulations by weak shear is apparent. We further measure transverse lamellae permeability arising from defects.
Pubmed
Web of science
Create date
08/07/2013 9:22
Last modification date
20/08/2019 14:49
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