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  • Title: Curvature-Induced Twist in Homeotropic Nematic Tori.
    Author: Ellis PW, Nayani K, McInerney JP, Rocklin DZ, Park JO, Srinivasarao M, Matsumoto EA, Fernandez-Nieves A.
    Journal: Phys Rev Lett; 2018 Dec 14; 121(24):247803. PubMed ID: 30608771.
    Abstract:
    We confine a nematic liquid crystal with homeotropic anchoring to stable toroidal droplets and study how geometry affects the equilibrium director configuration. In contrast to the case of cylindrical confinement, we find that the equilibrium state is chiral-a twisted and escaped radial director configuration. Furthermore, we find that the magnitude of the twist distortion increases as the ratio of the ring radius to the tube radius decreases; we confirm this with computer simulations of optically polarized microscopy textures. In addition, numerical calculations also indicate that the local geometry indeed affects the magnitude of the twist distortion. We further confirm this curvature-induced twisting using bent cylindrical capillaries.
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