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Dynamic heterogeneity in complex interfaces of soft interface-dominated materials.

Leonard M C Sagis1,2, Bingxue Liu3, Yuan Li4

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Complex fluid interfaces, stabilized by proteins or nanoparticles, exhibit dynamic heterogeneity. Their relaxation follows a stretched exponential model, revealing disordered viscoelastic solid behavior unlike simple surfactant interfaces.

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Area of Science:

  • Interfacial science
  • Soft matter physics
  • Rheology

Background:

  • Fluid-fluid interfaces stabilized by proteins, polymers, or nanoparticles display complex dynamics.
  • Traditional models often treat interfaces as homogeneous viscoelastic fluids.

Purpose of the Study:

  • To investigate the dynamic heterogeneity and relaxation mechanisms of complex fluid interfaces.
  • To characterize the viscoelastic behavior of these interfaces and compare them to simpler systems.

Main Methods:

  • Subjecting fluid-fluid interfaces to step extension-compression deformations.
  • Utilizing atomic force microscopy and molecular dynamics simulations.
  • Analyzing relaxation response using the Kohlrausch-Williams-Watts function.

Main Results:

  • Complex interfaces exhibit dynamic heterogeneity in relaxation, described by a stretched exponential function (Kohlrausch-Williams-Watts).
  • Asymmetric relaxation dynamics were observed during extension (β=0.4-0.6) and compression (β=0.6-1.0).
  • Dynamic heterogeneity is linked to interfacial structural heterogeneity, with momentum transfer being a dominant relaxation mode.

Conclusions:

  • Complex interfaces behave as disordered viscoelastic solids, not simple 2D homogeneous fluids.
  • Momentum transfer between bulk and interface is a key relaxation mechanism, requiring new experimental approaches.
  • Understanding these dynamics is crucial for applications involving complex interfacial systems.