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  • Title: Spontaneous periodic deformations in nonchiral planar-aligned bimesogens with a nematic-nematic transition and a negative elastic constant.
    Author: Panov VP, Nagaraj M, Vij JK, Panarin YP, Kohlmeier A, Tamba MG, Lewis RA, Mehl GH.
    Journal: Phys Rev Lett; 2010 Oct 15; 105(16):167801. PubMed ID: 21231015.
    Abstract:
    Hydrocarbon linked mesogenic dimers are found to exhibit an additional nematic phase below the conventional uniaxial nematic phase as confirmed by x-ray diffraction. The phase produces unusual periodic stripe domains in planar cells. The stripes are found to be parallel to the rubbing direction (in rubbed cells) with a well-defined period equal to double the cell gap. The stripes appear without external electromagnetic field, temperature or thickness gradients, rubbing or hybrid alignment treatments. Simple modeling proposes a negative sign for at least one of the two elastic constants: splay and twist, as a necessary condition for the observed pattern.
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