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Flow field-based data analysis in interfacial shear rheometry.

Pablo Sánchez-Puga1, Javier Tajuelo2, Juan Manuel Pastor3

  • 1Departamento de Física Fundamental, Facultad de Ciencias, Universidad Nacional de Educación a Distancia, UNED, 28040 Madrid, Spain.

Advances in Colloid and Interface Science
|December 29, 2020
PubMed
Summary
This summary is machine-generated.

Advanced data analysis for interfacial shear rheometry is crucial for soft interfaces. Flow field calculations are essential for accurate interfacial viscosity and modulus determination in common rheometer geometries.

Keywords:
BiconeDWRFinite differencesFlow field approximationsInterfacial shear rheologyLangmuir monolayersMagnetic tweezersMicrorheologyMicrowiresSurfactants

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Physical Chemistry

Background:

  • Interfacial shear rheometry (ISR) measures the mechanical properties of interfaces.
  • Current ISR data analysis faces challenges due to complex flow fields at interfaces and bulk phases.
  • Accurate analysis requires accounting for nonlinear velocity profiles, especially in soft interfaces.

Purpose of the Study:

  • To review recent advances in ISR data analysis techniques.
  • To discuss flow field-based data analysis schemes for common ISR geometries.
  • To highlight the necessity of flow field calculations for accurate rheological property determination.

Main Methods:

  • Review of hydrodynamical models and equations of motion for ISR probes.
  • Development of iterative procedures to compute the complex Boussinesq number.
  • Application of flow field calculations to magnetic needle, double wall-ring, and bicone rheometers.

Main Results:

  • Flow field calculations are mandatory for proper data analysis in specific ISR geometries.
  • Accurate determination of complex interfacial viscosity and modulus is achieved through these methods.
  • The study validates the importance of considering bulk phase hydrodynamics.

Conclusions:

  • Flow field-based data analysis significantly enhances the accuracy of ISR measurements.
  • These advanced techniques are applicable to various ISR geometries and soft materials.
  • Potential extensions include micro-button ISR and bulk rheometry applications for soft samples.