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Smectic-like bâtonnets in nematic/twist-bend nematic biphasic samples.
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- Author(s): Meyer, C.; Stoenescu, D.; Luckhurst, G. R.; Davidson, P.; Dozov, I.
- Source:
Liquid Crystals; Jan2017, Vol. 44 Issue 1, p232-243, 12p- Subject Terms:
- Source:
- Additional Information
- Abstract: We have studied a mixture of the twist-bend nemogenic dimer CB7CB with rod-like nematic molecules, which exhibits nematic (N) and twist-bend nematic (NTB) phases and a very large biphasic coexistence range. At the N-NTBtransition, we observe the nucleation of highly anisometric NTBdroplets which are very similar to the classic smectic A (SmA) bâtonnets. These observations confirm the recently proposed close analogy between the NTBand SmA phases, on the basis of their identical macroscopic symmetry. As for their smectic analogues, the NTBbâtonnets are fluid in two dimensions; they easily merge when brought into contact and they are solid-like in that they did not flow along their optic axis. The observed fluidity and low viscosity show that the NTBphase is indeed a nematic phase, i.e. an anisotropic fluid, rather than a soft crystal or glassy state. Unlike their smectic analogues, the NTBbâtonnets have almost perfect symmetry of revolution and the axis of the NTBhelix is uniformly aligned parallel to the long axis of the bâtonnet. The large aspect ratio of the bâtonnets, typically ≈ 10–30, indicates a very strong anisotropy of the N-NTBinterfacial energy,W2/W0 ≈ 200–2000, and suggests that the anchoring energy differs from the usual Rapini–Papoular form. [ABSTRACT FROM PUBLISHER]
- Abstract: Copyright of Liquid Crystals is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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