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Shape-Assisted Self-Organization in Highly Disordered Liquid Crystal Phases.

Keiki Kishikawa1, Yusuke Yamamoto1, Go Watanabe2

  • 1Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan.

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|March 23, 2017
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Summary

Researchers discovered a novel liquid crystal phase (X phase) in dumbbell-shaped molecules. This phase exhibits a unique layered structure formed by interlocking molecules, distinct from typical nematic phases.

Keywords:
interlockingliquid crystalsmesophasesmolecular shapenematic phase

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Crystallography

Background:

  • Nematic phase is the most disordered liquid crystal phase for achiral rod-like molecules, characterized by one-directional order.
  • Liquid crystals exhibit unique phases with distinct molecular arrangements and properties.

Purpose of the Study:

  • To report and characterize a novel liquid crystal phase (X phase) in a dumbbell-shaped molecule.
  • To elucidate the molecular self-organization mechanism and structural properties of the X phase.

Main Methods:

  • Polarized light optical microscopy
  • X-ray diffraction
  • Scanning electron microscopy (SEM)
  • Atomic force microscopy (AFM)
  • Molecular dynamics (MD) simulation

Main Results:

  • A dumbbell-shaped molecule (compound 3) exhibited a unique liquid crystal phase (X phase) with high scattering and no thermal fluctuation.
  • The X phase displayed a distinct layered structure attributed to lateral intermolecular interlocking.
  • A second nematic phase composed of "rice grain"-shaped particles was observed above the X phase.

Conclusions:

  • The study identified and characterized a novel X phase in liquid crystals, demonstrating a unique self-organization mechanism.
  • The findings contribute to understanding complex liquid crystal phases beyond conventional nematic structures.
  • The observed layered structure and interlocking mechanism offer new insights into molecular self-assembly in soft materials.