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Frustrated phase driven by competition among layer structures


Using our designed a ternary system consisting of a semiperfluorinated smectic liquid crystal and two nematic liquid crystals, we investigated 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 to a smectic phase, but no peak corresponding to the layer spacing was detected. No difference was found in 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.

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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, Accepted Manuscript
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    Frustrated phase driven by competition among layer structures

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

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