Reference : Isotropic–isotropic phase separation and spinodal decomposition in liquid crystal–sol...
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Physics and Materials Science
http://hdl.handle.net/10993/40182
Isotropic–isotropic phase separation and spinodal decomposition in liquid crystal–solvent mixtures
English
Reyes, Catherine mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Baller, Jörg mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Araki, Takeaki mailto [Kyoto University > Department of Physics]
Lagerwall, Jan mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
14-Jun-2019
Soft Matter
Royal Society of Chemistry
15
6044-6054
Yes
International
1744-683X
1744-6848
Cambridge
United Kingdom
[en] liquid crystal ; 5CB ; phase separation ; ethanol ; binary mixtures ; water ; phase diagram ; free energy ; concentration gradient ; polarized optical microscopy ; DSC ; numerical simulation
[en] Phase separation in mixtures forming liquid crystal (LC) phases is an important yet under- appreciated phenomenon that can drastically influence the behaviour of a multi-component LC. Here we demonstrate, using polarising microscopy with active cooling as well as differential scanning calorimetry, that the phase diagram for mixtures of the LC-forming compound 4’-n- pentylbiphenyl-4-carbonitrile (5CB) with ethanol is surprisingly complex. Binary mixtures reveal a broad miscibility gap that leads to phase separation between two distinct isotropic phases via spinodal decomposition or nucleation and growth. On further cooling the nematic phase enters on the 5CB-rich side, adding to the complexity. Significantly, water contamination dramatically raises the temperature range of the miscibility gap, bringing up the critical temperature for spinodal de- composition from ∼ 2◦C for the anhydrous case to > 50◦C if just 3 vol.% water is added to the ethanol. We support the experiments with a theoretical treatment that qualitatively reproduces the phase diagrams as well as the transition dynamics, with and without water. Our study highlights the impact of phase separation in LC-forming mixtures, spanning from equilibrium coexistence of multiple liquid phases to non-equilibrium effects due to persistent spatial concentration gradients.
Researchers ; Professionals ; Students ; General public ; Others
http://hdl.handle.net/10993/40182
10.1039/C9SM00921C
https://pubs.rsc.org/en/content/articlelanding/2019/SM/C9SM00921C#!divAbstract
H2020 ; 648763 - INTERACT - Intelligent Non-woven Textiles and Elastomeric Responsive materials by Advancing liquid Crystal Technology

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Supplementary Data for Experiments.pdfSupplementary Data for Experiments in Main Paper8.11 MBView/Open
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