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Related Experiment Videos

[Quasithermal crystallization of cholesteric mixtures].

R I Mints, E V Kononenko

    Biofizika
    |September 1, 1979
    PubMed
    Summary

    Cholesteric liquid crystals can crystallize via a dislocation mechanism when stored long-term at 20°C. This study estimates critical nuclei size for this unexpected crystallization process.

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    Area of Science:

    • Liquid crystal physics
    • Materials science
    • Crystallization phenomena

    Context:

    • Investigating the long-term behavior of cholesteric liquid crystal mixtures.
    • Observing phase transitions and structural changes at sub-transition temperatures.
    • Analyzing the influence of sample defects on texture evolution.

    Purpose:

    • To study the behavior of cholesteric mixtures stored below their isotropic transition temperature.
    • To identify and characterize crystallization mechanisms in aged cholesteric liquid crystals.
    • To estimate the critical size of crystallization nuclei.

    Summary:

    • Cholesteric mixtures stored at 20°C (below their 30-38°C isotropic transition) exhibit texture changes and crystallization.
    • Crystallization occurs via a dislocation mechanism, distinct from simple texture transitions related to defects.
    • The critical size for crystallization nuclei was estimated, revealing a new pathway for crystal formation.

    Impact:

    • Reveals a novel dislocation-based crystallization mechanism in cholesteric liquid crystals.
    • Provides insights into crystal phase isolation from liquid crystalline materials.
    • Contributes to understanding crystallization in biological liquid crystal systems.

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