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Elastocapillary interaction for particles trapped at the isotropic-nematic liquid crystal interface.

J-C Loudet1

  • 1Université de Bordeaux, CNRS, Centre de Recherche Paul Pascal (UMR 5031), 33600 Pessac, France.

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|June 22, 2024
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Summary

Particles at liquid crystal interfaces experience elastocapillary interactions. Anchoring conflicts drive attractive forces, enabling controlled self-assembly, while their absence leads to repulsion.

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Area of Science:

  • Soft Matter Physics
  • Liquid Crystals
  • Interfacial Science

Background:

  • Particles at liquid crystal interfaces exhibit complex interactions.
  • Elastocapillary forces arise from interfacial deformations and elastic distortions.
  • Understanding these interactions is crucial for controlling particle self-assembly.

Purpose of the Study:

  • To investigate pairwise interactions between particles at an isotropic-nematic liquid crystal interface.
  • To quantify the influence of anchoring configurations on particle interactions.
  • To explore the role of elastocapillary forces in particle self-assembly.

Main Methods:

  • Numerical simulations using a phase-field model.
  • Calculation of pair potentials for various particle separations.
  • Analysis of two anchoring configurations: with and without anchoring conflict.

Main Results:

  • An anchoring conflict induces significant interfacial deformations and attractive capillary forces.
  • Attractive forces can overcome repulsive elastic forces at intermediate separations, leading to an equilibrium distance.
  • Absence of anchoring conflict results in negligible capillary forces and purely repulsive interactions dominated by elastic forces.

Conclusions:

  • Particle self-assembly at isotropic-nematic interfaces can be controlled by tuning anchoring conflicts.
  • Elastocapillary interactions play a critical role in dictating particle behavior.
  • The findings provide insights into designing self-assembling systems at liquid crystal interfaces.