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  • Title: Coupling between splay deformations and density modulations in splay-bend phases of bent colloidal rods.
    Author: Anzivino C, van Roij R, Dijkstra M.
    Journal: Phys Rev E; 2022 Feb; 105(2):L022701. PubMed ID: 35291166.
    Abstract:
    Using a grand-canonical Landau-de Gennes theory for colloidal suspensions of bent (banana-shaped) rods, we investigate how spatial deformations in the nematic director field affect the local density of twist-bend and splay-bend nematic phases. The grand-canonical character of the theory naturally relates the local density to the local nematic order parameter S. In the splay-bend phase, we find S and hence the local density to modulate periodically along one spatial direction. As a consequence the splay-bend phase has the key symmetries of a smectic rather than a nematic phase. By contrast we find that S and hence the local density do not vary in space in the twist-bend phase, which is therefore a proper nematic phase. The theoretically predicted one-dimensional density modulations in splay-bend phases are in agreement with recent simulations.
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