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Title: On the occurrence of point and ring defects in the nematic-nematic coexistence range of a binary mixture of rod-like and disc-like mesogens
Authors: Pratibha, R.
Madhusudana, N.V.
Keywords: point defects
ring defects
nematic-nematic coexistence
Issue Date: Jan-1990
Publisher: Gordon and Breach Science Publishers.
Citation: Molecular Crystals and Liquid Crystals, 1990, Vol.178, p167-178
Abstract: We report some observations on the director configurations in the coexistence range of two nematic phases, NR and ND in a binary mixture of rod-like and disc- like nematogens. The director alignment is continuous across the boundary of the NR and ND phases. Point defects of strength + 1 in NR droplets in an otherwise continuous ND medium are found to be annulled by singular ring disclinations of strength - 1/2 Further, the NR drops which orient homeotropically at the glass plates have a point defect of strength + 1 only if their size is less than about 7 b.mum. Larger drops have ring disclinations of strength + 1/2 instead of + 1 point defects. This changeover can be understood on the basis of simple energy considerations.
Description: Restricted Access.
ISSN: 1058-725X
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Copyright: 1990 OPA (Overseas Publishers Association) N.V.
Appears in Collections:Research Papers (SCM)

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