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Nematic films at chemically structured surfaces.

N M Silvestre1, M M Telo da Gama, M Tasinkevych

  • 1Centro de Física Teórica e Computacional, Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, Campo Grande P-1749-016 Lisboa, Portugal.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 31, 2016
PubMed
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Chemically patterned substrates deform thin nematic liquid crystal films, creating undulations. This substrate-induced deformation depends on film thickness and pattern pitch, with effective models showing surprising agreement with full theories.

Area of Science:

  • Physics
  • Materials Science
  • Soft Matter Physics

Background:

  • Nematic liquid crystals (NLCs) exhibit unique anisotropic properties.
  • Surface patterning influences the morphology of adsorbed NLC films.
  • Understanding NLC film behavior on patterned substrates is crucial for applications.

Purpose of the Study:

  • To theoretically investigate the morphology of thin nematic films on chemically patterned substrates.
  • To develop and validate an effective interfacial model for NLC film deformations.
  • To explore the relationship between substrate properties and NLC film morphology.

Main Methods:

  • Construction of an exactly-solvable effective interfacial model.
  • Incorporation of liquid crystal distortions via an effective interface potential.

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  • Comparison with numerical solutions of a full Landau-de Gennes model.

    • Main Results:

    • Chemically patterned substrates induce significant deformation of the nematic-air interface.
    • Deformation amplitude increases with decreasing film thickness and increasing pattern pitch.
    • A material-independent universal scaling function describes interfacial deformation in a specific regime.

    Conclusions:

    • Effective interfacial models can accurately predict NLC film morphology on patterned substrates.
    • Substrate chemistry and topography play a critical role in controlling NLC film structure.
    • The findings offer insights into designing NLC-based devices with controlled interfacial properties.