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Related Experiment Video

Updated: Jun 26, 2026

Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions
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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

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Linear-to-branched micelles transition: a rheometry and diffusing wave spectroscopy (DWS) study.

C Oelschlaeger1, M Schopferer, F Scheffold

  • 1Institute of Mechanical Process Engineering and Mechanics, University Karlsruhe, Gotthard-Franz-Str. 3, 76128 Karlsruhe, Germany. Claude.Oelschlaeger@mvm.uni-karlsruhe.de

Langmuir : the ACS Journal of Surfaces and Colloids
|January 14, 2009
PubMed
Summary

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This study measured the frequency-dependent shear modulus of wormlike micellar solutions using rheometry and diffusing wave spectroscopy. Key parameters like plateau modulus and scission energy were analyzed across varying salt/surfactant ratios.

Area of Science:

  • Soft Matter Physics
  • Colloid Science
  • Rheology

Background:

  • Wormlike micellar solutions exhibit complex rheological behavior dependent on salt concentration.
  • Understanding micellar structure and dynamics is crucial for predicting solution properties.
  • Previous studies identified transitions in micellar morphology with varying salt/surfactant ratios.

Purpose of the Study:

  • To investigate the frequency-dependent shear modulus of cetylpyridinium chloride (CPyCl) and sodium salicylate (NaSal) micellar solutions.
  • To determine the influence of salt/surfactant ratio (R) on plateau modulus (G(0)), scission energy (E(sciss)), and persistence length (l(p)).
  • To correlate rheological properties with micellar structure transitions.

Main Methods:

  • Frequency-dependent shear modulus measurements using diffusing wave spectroscopy (DWS) and mechanical techniques (rotational rheometry, oscillatory squeeze flow).

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  • Determination of plateau modulus (G(0)) and scission energy (E(sciss)) via squeeze flow and temperature dependence.
  • Determination of persistence length (l(p)) using DWS with inertia correction.

    • Main Results:

    • Good agreement between optical (DWS) and mechanical techniques over a broad frequency range.
    • Plateau modulus (G(0)) increases at the linear-to-branched micelle transition, attributed to branching points.
    • Scission energy (E(sciss)) shows two maxima correlating with viscosity, influenced by micellar length and branching.
    • Persistence length (l(p)) decreases with increasing salt/surfactant ratio (R), stronger than predicted by OSF theory, due to ion penetration.

    Conclusions:

    • Rheological properties of CPyCl/NaSal solutions are strongly dependent on salt/surfactant ratio and micellar architecture.
    • Branching points contribute to the cross-link density, affecting the plateau modulus.
    • Salicylate ion penetration into micelles significantly influences persistence length, beyond electrostatic effects.