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Phase behaviour and applications of a binary liquid mixture of methanol and a thermotropic liquid crystal

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Abstract

Herein, we report on the phase behaviour of a binary liquid mixture composed of methanol (MeOH) and the thermotropic liquid crystal 4-cyano-4′-pentylbiphenyl (5CB). The corresponding phase diagram combines features of a conventional liquid–liquid mixture with characteristics that are particular to the nematic liquid crystal. We observe four arrangements as a function of composition and temperature, namely monophasic isotropic, monophasic nematic, biphasic isotropic–isotropic and biphasic isotropic–nematic, with an upper critical solution temperature of 24.4 ± 0.5 °C. The interplay of nematogenic and non-nematogenic species offers tunability of phase mixing and phase composition in an accessible temperature window and provides novel routes for the extraction of target compounds, here exemplarily shown for Crystal Violet, Doxorubicin, Eosin Y, Rhodamine 6G and Sudan IV.

Graphical abstract: Phase behaviour and applications of a binary liquid mixture of methanol and a thermotropic liquid crystal

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Publication details

The article was received on 15 Feb 2018, accepted on 21 Apr 2018 and first published on 23 Apr 2018


Article type: Paper
DOI: 10.1039/C8SM00327K
Citation: Soft Matter, 2018, Advance Article
  • Open access: Creative Commons BY license
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    Phase behaviour and applications of a binary liquid mixture of methanol and a thermotropic liquid crystal

    L. A. Serrano, M. J. Fornerod, Y. Yang, S. Gaisford, F. Stellacci and S. Guldin, Soft Matter, 2018, Advance Article , DOI: 10.1039/C8SM00327K

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