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This study investigates liquid crystal glasses in the smectic CA* phase using X-ray diffraction. Results show slow changes in molecular spacing and electron density below the glass transition temperature.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Crystallography

Background:

  • Liquid crystals exhibit unique phases between solid and liquid states.
  • The smectic CA* phase is a complex liquid crystalline phase with tilted molecular ordering.
  • Understanding the glassy state of liquid crystals is crucial for their technological applications.

Purpose of the Study:

  • To investigate the structural and electronic properties of a smectic CA* liquid crystal glass.
  • To determine characteristic distances and electron density profiles within the smectic CA* glass.
  • To analyze the helical ordering and its temperature dependence below the glass transition temperature.

Main Methods:

  • X-ray diffraction was employed to study the liquid crystalline compound over a temperature range of 18-298 K.
  • Electron density profiles were inferred and compared with density functional theory (DFT) calculations.
  • Selective reflection of visible light was observed to investigate helical ordering.

Main Results:

  • Characteristic distances and specific volume within the smectic CA* phase were determined.
  • Electron density profiles were consistent with DFT calculations.
  • Slow temperature-dependent changes were observed in smectic layer spacing, intermolecular distances, and electron density below the glass transition temperature.
  • The helix pitch and short-range order within smectic layers remained relatively constant in the glassy state.

Conclusions:

  • The glassy state of the smectic CA* liquid crystal exhibits slow structural evolution below the glass transition temperature.
  • Molecular ordering and helical structure show stability within the glassy state.
  • The study provides insights into the behavior of liquid crystal glasses, relevant for materials science and condensed matter physics.