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Pendant capsule elastometry.

Jonas Hegemann1, Sebastian Knoche1, Simon Egger2

  • 1Physics Department, TU Dortmund University, 44221 Dortmund, Germany.

Journal of Colloid and Interface Science
|November 28, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces open-source software for analyzing elastic capsule shapes using pendant capsule elastometry, offering a precise method for determining material properties beyond traditional surface tension measurements.

Keywords:
Bending modulusCapsule shape analysisElastic capsulesInterfacial rheologyMicrocapsulesPendant dropPoisson’s ratioTensiometerWrinklingYoung’s surface modulus

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Area of Science:

  • Materials Science
  • Biophysics
  • Rheology

Background:

  • Pendant drop tensiometry offers limited insight into elastic capsule properties, relying on simplified liquid interface models.
  • Accurate characterization of elastic capsules is crucial for understanding their behavior in various applications.

Purpose of the Study:

  • To develop and present C/C++ software for precise shape analysis of deflated elastic capsules.
  • To establish pendant capsule elastometry as a robust method for determining interfacial rheology and elastic moduli.
  • To implement and compare different elastic constitutive models for capsule membranes.

Main Methods:

  • Utilizes shell theory for a quasi-2D elastic membrane model of capsule material.
  • Employs pendant capsule elastometry to fit numerically generated shapes to experimental images.
  • Determines elastic moduli (Young's surface modulus, Poisson's ratio, Rivlin modulus) based on chosen constitutive laws (Hookean, Mooney-Rivlin, neo-Hookean).

Main Results:

  • Nonlinear Hookean elasticity is found to be sufficient for most capsule analyses.
  • The software accurately determines elastic moduli from digitized capsule images when reference shapes are provided.
  • Wrinkling wavelength measurements enable determination of the bending modulus and layer thickness.

Conclusions:

  • Pendant capsule elastometry, supported by the developed software, provides a superior method for characterizing elastic capsule rheology.
  • The software allows for analysis of dynamic effects like hysteresis, aging, and viscoelasticity by evaluating moduli over changing capsule volumes.
  • The open-source software is available for broader scientific use and verification.