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Temperature-Induced Liquid Crystal Microdroplet Formation in a Partially Miscible Liquid Mixture

preprint
submitted on 26.08.2019 and posted on 27.08.2019 by Mehzabin Patel, Anand N. Pallipurath Radhakrishnan, Ludovic Bescher, Elwin Hunter-Sellars, Benjamin Schmidt-Hansberg, Esther Amstad, Stuart Ibsen, Stefan Guldin
The controlled formation of microdroplets through temperature variation is an intriguing concept for binary liquid mixtures with a critical solution temperature. Here, we investigate this phenomenon for a blend of methanol (MeOH) and a thermotropic liquid crystal (LC) 4-Cyano-4’-pentylbiphenyl (5CB). A near-room-temperatureinduced phase separation leads to nucleation, growth and coalescence of mesogen-rich droplets. The size and number of the droplets is tunable on the microscopic scale by variation of temperature quench depth and cooling rate. Further cooling induces a phase transition to nematic droplets with radial configuration, well-defined sizes and stability over the course of an hour. This fully reversible process is an interesting material system with relevance in diagnostics, optoelectronics, materials templating and extraction processes.

Funding

H2020 Research & Innovation (no. 633635, DIACHEMO)

EPSRC (EP/L015862/1)

History

Email Address of Submitting Author

s.guldin@ucl.ac.uk

Institution

University College London

Country

United Kingdom

ORCID For Submitting Author

0000-0002-4413-5527

Declaration of Conflict of Interest

No conflict of interest to declare.

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