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Elastic capsules at liquid-liquid interfaces.

Jonas Hegemann1, Horst-Holger Boltz, Jan Kierfeld

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Elastic microcapsules deform into lens shapes at liquid-liquid interfaces, influenced by their bending rigidity. This deformation offers insights into elastic properties and potential applications in stabilizing foams and emulsions.

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Area of Science:

  • Soft matter physics
  • Materials science
  • Surface science

Background:

  • Elastic microcapsules at liquid-liquid interfaces deform due to surface tension.
  • Deformation depends on the capsule's bending rigidity, leading to lens or discus shapes.
  • This behavior differs from liquid droplet deformation.

Purpose of the Study:

  • To investigate the deformation of elastic microcapsules at liquid-liquid interfaces.
  • To analyze the influence of stretching and bending moduli on capsule shape.
  • To provide theoretical results for inferring elastic moduli from optical measurements.

Main Methods:

  • Numerical calculations using shape equations from nonlinear elastic shell theory.
  • Analysis of deformed shapes across a range of surface elasticities.
  • Theoretical prediction of contact angle and maximal curvature at the three-phase contact line.

Main Results:

  • Elastic capsules deform into lens-like shapes, distinct from liquid droplets.
  • Deformation involves conversion of surface energy to elastic energy, yielding adsorption energy gain.
  • Soft hollow capsules show significant adsorption energy increase, enhancing their stability.

Conclusions:

  • Deformation behavior provides a method to determine elastic moduli of microcapsules.
  • Elastic microcapsules are promising as stabilizers for foams and emulsions due to their adsorption energy gain.