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Rectangular to hexagonal columnar phase transition exhibited by a biforked mesogen.

A C Ribeiro1, B Heinrich, C Cruz

  • 1Institut de Physique et Chimie des Matériaux de Strasbourg, 23 rue du Loess, BP 20, 67037 Strasbourg, France. ribiro@cii.fc.ul.pt

The European Physical Journal. E, Soft Matter
|March 11, 2004
PubMed
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This study reveals tilted molecular clusters in a rectangular mesophase, a novel finding for biforked compounds. The research details structural changes during the rectangular-to-hexagonal columnar phase transition.

Area of Science:

  • Materials Science
  • Crystallography
  • Physical Chemistry

Background:

  • Columnar liquid crystals exhibit unique self-assembly properties.
  • Phase transitions in liquid crystalline materials are crucial for their applications.
  • Biforked compounds present complex molecular architectures.

Purpose of the Study:

  • To investigate the structural characteristics of a biforked compound undergoing a columnar phase transition.
  • To elucidate the molecular packing and orientation within different columnar mesophases.
  • To analyze the kinetics and mechanism of the phase transition.

Main Methods:

  • Differential Scanning Calorimetry (DSC) for thermal analysis.
  • Optical microscopy for observing mesophase behavior.

Related Experiment Videos

  • X-ray diffraction for structural determination.
  • Dilatometry for measuring dimensional changes.
  • Molecular modeling for understanding molecular arrangements.

    • Main Results:

    • The biforked compound exhibits a phase transition between rectangular (Colr) and hexagonal (Colh) columnar mesophases.
    • For the first time, tilted molecular clusters within the columnar axis were observed in the rectangular mesophase.
    • The number of molecules per columnar section was determined to be approximately 5 for Colr and 4 for Colh.
    • The transition between the Colr and Colh phases displays slow kinetics.

    Conclusions:

    • The study provides novel insights into the molecular organization of biforked compounds in columnar phases.
    • The observed tilting of molecular clusters in the Colr phase is a significant structural feature.
    • Understanding the phase transition kinetics is essential for potential applications of these materials.