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A frustrated phase driven by competition among layer structures

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Abstract

Using our designed ternary system consisting of a semiperfluorinated smectic liquid crystal and two nematic liquid crystals, we investigated their phase transition behaviour using polarizing optical microscopy, differential scanning calorimetry and X-ray diffraction. A mixture containing 20 mol% of the semiperfluorinated compound was found to exhibit the following unusual phase sequence: isotropic liquid − isotropic liquid + smectic A phase − nematic phase − unidentified frustrated phase (X) − modulated phase (Y) − modulated phase (Z). The frustrated phase showed a fan-shaped texture characteristic of a smectic phase, but no peak corresponding to the layer spacing was detected. No difference was found in the shearing stress between the high-temperature N phase and the frustrated phase, but electro-optical switching observed in the N phase was not detected in the frustrated phase. We discuss how the molecules organize the unusual phase transition behaviour.

Graphical abstract: A frustrated phase driven by competition among layer structures

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Publication details

The article was received on 01 Jun 2017, accepted on 15 Jun 2017 and first published on 15 Jun 2017


Article type: Paper
DOI: 10.1039/C7SM01090G
Citation: Soft Matter, 2017, Advance Article
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    A frustrated phase driven by competition among layer structures

    T. Sasaki, Y. Takanishi, J. Yamamoto and A. Yoshizawa, Soft Matter, 2017, Advance Article , DOI: 10.1039/C7SM01090G

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