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Issue 13, 2018
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Molecular shape as a means to control the incidence of the nanostructured twist bend phase

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Abstract

Liquid crystalline phases with a spontaneous twist-bend modulation are most commonly observed for dimers and bimesogens with nonamethylene spacers. In order to redress this balance we devised a simple chemical intermediate that can be used to prepare unsymmetrical bimesogens; as a proof of concept we prepared and studied eleven novel materials with all found to exhibit the twist-bend phase and exhibit a linear relationship between TN-I and TTB-N. A computational study of the conformational landscape reveals the octamethyleneoxy spacer to have a broader distribution of bend-angles than the nonamethylene equivalent, leading to reductions in the thermal stability of the TB phase. This result indicates that a tight distribution of bend-angles should stabilise the TB phase and lead to direct TB-Iso phase transitions, and conversely a broader distribution should destabilise the TB phase which may allow new states of matter that are occluded by the incidence of this phase to be revealed.

Graphical abstract: Molecular shape as a means to control the incidence of the nanostructured twist bend phase

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Publication details

The article was received on 01 Dec 2017, accepted on 17 Jan 2018 and first published on 12 Mar 2018


Article type: Paper
DOI: 10.1039/C7SM02364B
Citation: Soft Matter, 2018,14, 2508-2514
  • Open access: Creative Commons BY-NC license
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    Molecular shape as a means to control the incidence of the nanostructured twist bend phase

    E. E. Pocock, R. J. Mandle and J. W. Goodby, Soft Matter, 2018, 14, 2508
    DOI: 10.1039/C7SM02364B

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