Paterson DA, Du X, Bao P, Parry AA, Peyman SA, Sandoe JAT, Evans SD, Luo D, Bushby RJ, Jones JC, Gleeson HF. Chiral nematic liquid crystal droplets as a basis for sensor systems.
Mol Syst Des Eng 2022;
7:607-621. [PMID:
36876150 PMCID:
PMC9972830 DOI:
10.1039/d1me00189b]
[Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Accepted: 02/28/2022] [Indexed: 05/22/2023]
Abstract
For a series of phospholipid coated calamitic nematic liquid crystal droplets (5CB, 6CB, 7CB, E7 and MLC7023) of diameter ∼18 μm, the addition of chiral dopant leaves the sign of surface anchoring unchanged. Herein we report that for these chiral nematic droplets an analyte induced transition from a Frank-Pryce structure (with planar anchoring) to a nested-cup structure (with perpendicular anchoring) is accompanied by changes in the intensity of reflected light. We propose this system as both a general scheme for understanding director fields in chiral nematic liquid crystal droplets with perpendicular anchoring and as an ideal candidate to be utilised as the basis for developing cheap, single use LC-based sensor devices.
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