Article (Scientific journals)
Influence of interface stabilisers and surrounding aqueous phases on nematic liquid crystal shells
Noh, Junghyun; Reguengo De Sousa, Kevin; Lagerwall, Jan
2015In Soft Matter, in press
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Abstract :
[en] We investigate the nematic–isotropic (N–I) transition in shells of the liquid crystal 5CB, surrounded by aqueous phases that conven- tionally are considered to be immiscible with 5CB. The aqueous phases contain either sodium dodecyl sulfate (SDS) or polyvinyl alcohol (PVA) as stabiliser, the former additionally promoting homeotropic director alignment. For all shell configurations we find a depression of the clearing point compared to pure 5CB, indicating that a non-negligible fraction of the constituents of the surrounding phases enter the shell, predominantly water. In hybrid- aligned shells, with planar outer and homeotropic inner boundary (or vice versa), the N–I transition splits into two steps, with a consequent three-step textural transformation. We explain this as a result of the order-enhancing effect of a monolayer of radially aligned SDS molecules adsorbed at the homeotropic interface.
Disciplines :
Physics
Author, co-author :
Noh, Junghyun ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Reguengo De Sousa, Kevin
Lagerwall, Jan  ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
External co-authors :
no
Language :
English
Title :
Influence of interface stabilisers and surrounding aqueous phases on nematic liquid crystal shells
Publication date :
2015
Journal title :
Soft Matter
ISSN :
1744-6848
Publisher :
Royal Society of Chemistry, Cambridge, United Kingdom
Volume :
in press
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
PhD Grant 6992111
Funders :
FNR - Fonds National de la Recherche [LU]
Available on ORBilu :
since 16 November 2015

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