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Anomalous capillary length in cellular nematic-isotropic interfaces.

O A Gomes1, R C Falcão, O N Mesquita

  • 1Departamento de Física, ICEX, Universidade Federal de Minas Gerais, Caixa Postal 702, Belo Horizonte, CEP 30123-970, MG, Brazil.

Physical Review Letters
|April 6, 2001
PubMed
Summary

The capillary length paradox in cellular systems is solved. Substrate-nematic anchoring energy and ion adsorption significantly increase capillary length in confined systems.

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Area of Science:

  • Materials Science
  • Physics
  • Chemistry

Background:

  • The Mullins-Sekerka theory predicts a capillary length of 0.05 Å for cellular nematic-isotropic interfaces.
  • Experimental measurements consistently show capillary lengths significantly longer than predicted.
  • This discrepancy has been a long-standing puzzle in the field.

Purpose of the Study:

  • To resolve the paradox of the underestimated capillary length in cellular nematic-isotropic interfaces.
  • To identify the factors contributing to the discrepancy between theoretical predictions and experimental observations.

Main Methods:

  • Theoretical analysis of capillary length in confined systems.
  • Investigation of the role of substrate-nematic anchoring energy.
  • Examination of the impact of selective ion adsorption on the substrate.

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Main Results:

  • The Mullins-Sekerka theory's prediction is insufficient for confined cellular systems.
  • Substrate-nematic anchoring energy significantly influences capillary length.
  • Selective adsorption of ions on the substrate further enhances the capillary length.

Conclusions:

  • The extended capillary length is attributed to the combined effects of substrate-nematic anchoring and ion adsorption in confined environments.
  • This finding resolves the long-standing puzzle and provides a more accurate understanding of interfacial phenomena in cellular systems.