Squeezing a drop of nematic liquid crystal with strong elasticity effects

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Cousins, J. R. L. and Wilson, S. K. and Mottram, N. J. and Wilkes, D. and Weegels, L. (2019) Squeezing a drop of nematic liquid crystal with strong elasticity effects. Physics of Fluids, 31 (8). 083107. ISSN 1089-7666 (https://doi.org/10.1063/1.5110878)

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Abstract

The One Drop Filling (ODF) method is widely used for the industrial manufacture of liquid crystal devices. Motivated by the need for a better fundamental understanding of the reorientation of the molecules due to the flow of the liquid crystal during this manufacturing method, we formulate and analyze a squeeze-film model for the ODF method. Specifically, we consider a nematic squeeze film in the asymptotic regime in which the drop is thin, inertial effects are weak, and elasticity effects are strong for four specific anchoring cases at the top plate and the substrate (namely, planar, homeotropic, hybrid aligned nematic, and π-cell infinite anchoring conditions) and for two different scenarios for the motion of the top plate (namely, prescribed speed and prescribed force). Analytical expressions for the leading- and first-order director angles, radial velocity, vertical velocity, and pressure are obtained. Shear and couple stresses at the top plate and the substrate are calculated and are interpreted in terms of the effect that flow may have on the alignment of the molecules at the plates, potentially leading to the formation of spurious optical defects ("mura").

ORCID iDs

Cousins, J. R. L. ORCID logoORCID: https://orcid.org/0000-0003-1723-5386, Wilson, S. K. ORCID logoORCID: https://orcid.org/0000-0001-7841-9643, Mottram, N. J. ORCID logoORCID: https://orcid.org/0000-0002-7265-0059, Wilkes, D. and Weegels, L.;
  • Item type:Article
    ID code:69063
    Dates:
    Date
    Event
    22 August 2019
    Published
    22 July 2019
    Accepted
    Notes:The following article has been accepted by Physics of Fluids. After it is published, it will be found at https://aip.scitation.org/journal/phf.
    Subjects:Science > Physics
    Department:Faculty of Science > Mathematics and Statistics
    Depositing user: Pure Administrator
    Date deposited:26 Jul 2019 10:57
    Last modified:19 Dec 2024 01:23
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/69063
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