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Related Experiment Videos

Faceting and stability of smectic A droplets on a solid substrate.

P Oswald1, L Lejcek

  • 1Laboratoire de Physique, Ecole Normale Supérieure de Lyon, 69364, Lyon cedex 07, France. Patrick.Oswald@ens-lyon.fr

The European Physical Journal. E, Soft Matter
|April 14, 2006
PubMed
Summary

Smectic A droplets on substrates exhibit top faceting due to bulk edge dislocations, not surface steps. Observed droplet shapes represent metastable states near phase transitions.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Liquid Crystals

Background:

  • Smectic A liquid crystal phases exhibit unique phase behaviors.
  • Surface anchoring conditions significantly influence droplet morphology.
  • Phase transitions in liquid crystals are critical for device applications.

Purpose of the Study:

  • Investigate the faceting phenomenon in smectic A droplets on solid substrates.
  • Determine the relationship between droplet profile, temperature, and anchoring.
  • Analyze the stability and equilibrium of droplet configurations near phase transitions.

Main Methods:

  • Experimental deposition of smectic A droplets on homeotropically treated substrates.
  • Profilometry and microscopy to characterize droplet shape and surface features.

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  • Thermodynamic analysis to model droplet equilibrium and metastable states.

    • Main Results:

    • Observed top faceting in smectic A droplets, attributed to bulk edge dislocations.
    • Determined facet radius and droplet profile as a function of temperature near the nematic-smectic A transition.
    • Identified observed profiles as metastable configurations, not true equilibrium shapes.
    • Predicted temperature-dependent profile variations based on heating/cooling history.

    Conclusions:

    • Smectic A droplet faceting is driven by internal bulk defects rather than surface steps.
    • Droplet shapes near the nematic-smectic A transition are often metastable.
    • The thermal history of the sample influences the observed droplet morphology.