Observation of a reentrant twist grain boundary phase |
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Authors: | Shankar Rao D S Krishna Prasad S Raja V N Yelamaggad C V Anitha Nagamani S |
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Affiliation: | Centre for Liquid Crystal Research, Jalahalli, Bangalore 560 013, India. |
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Abstract: | We report the occurrence of a reentrant twist grain boundary phase, which we designate as Re- TGB(A). Microscopic observations on a nonsymmetric dimer showed the phase sequence Iso- N*- TGB(A)-Sm- A-Re- TGB(A)- TGB(C*). Here N* and Sm- A stand for the chiral nematic and smectic- A phases, TGB(A) is the twist grain boundary phase with smectic- A blocks, and TGB(C*) that with smectic- C* blocks and exhibiting features of both the smectic- C* and TGB phases. The reentrance of the TGB(A) phase is unambiguously demonstrated using x-ray diffraction, selective reflection, and optical rotation data. |
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