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Updated: Sep 25, 2025

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Interfacial viscoelastic moduli in a weak gel.

Ahmad Jaber1, Thibault Roques-Carmes2, Philippe Marchal2

  • 1Institut des Molécules et Matériaux du Mans (IMMM), UMR 6283 CNRS - Le Mans Université, 1, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France; Laboratoire Réactions et Génie des Procédés, UMR 7274 CNRS, Université de Lorraine, 1 rue Grandville, 54001 Nancy, France.

Journal of Colloid and Interface Science
|May 1, 2022
PubMed
Summary
This summary is machine-generated.

Carrageenan solutions can form gels affecting interfacial properties. The oscillating pendant drop method effectively detects weak gels, even when bulk rheometry shows minimal changes.

Keywords:
Drop tensiometerInterfacial viscoelasticityWeak gelκ-carrageenan

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Area of Science:

  • Colloid and Surface Science
  • Rheology
  • Materials Science

Background:

  • Interfacial viscoelastic moduli reveal surface-active agent behavior.
  • Bulk rheology significantly influences interfacial properties, especially in gel-like continuous phases.
  • Understanding these contributions is crucial for predicting interfacial phenomena.

Purpose of the Study:

  • To investigate the influence of bulk rheology, specifically κ-carrageenan solutions, on interfacial viscoelastic properties.
  • To correlate the frequency dependence of bulk and interfacial moduli.
  • To evaluate the sensitivity of the oscillating pendant drop method for detecting weak gel formation.

Main Methods:

  • Aqueous solutions of κ-carrageenan were prepared at varying concentrations (2-6 g/L).
  • Rheological properties (bulk) were measured using a conventional shear rheometer.
  • Interfacial viscoelastic moduli were determined using an oscillating pendant drop tensiometer with polyisobutene oil.

Main Results:

  • κ-carrageenan solutions exhibited Newtonian behavior at low concentrations or high temperatures.
  • A reversible liquid/gel transition was observed with hysteresis, tunable by carrageenan concentration.
  • Gelled κ-carrageenan solutions induced interfacial elasticity, strengthening with higher bulk elastic modulus.

Conclusions:

  • The oscillating pendant drop method is highly sensitive to the presence of weak gels.
  • This technique can detect gelation in continuous phases even when conventional shear rheometry shows limited response.
  • Interfacial rheology is significantly impacted by the gel-like behavior of the bulk phase.