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Area of Science:

  • Colloid and Surface Science
  • Soft Matter Physics
  • Materials Science

Background:

  • Colloidal suspensions are ubiquitous in nature and industry.
  • Understanding gel formation and aging dynamics is crucial for material design.
  • Short-range attractions significantly influence suspension behavior.

Purpose of the Study:

  • To investigate gel formation and aging in attractive colloidal suspensions.
  • To explore the impact of tunable attraction strength on gel dynamics.
  • To elucidate the non-monotonic aging behavior and its underlying mechanisms.

Main Methods:

  • Combined rheology and X-ray Photon Correlation Spectroscopy (XPCS).
  • Systematic variation of temperature to tune interparticle attraction strength.
  • Development of a theoretical model for gel aging dynamics.

Main Results:

  • Gels form upon quenching to below the gel point, exhibiting aging characterized by increasing modulus and slowing dynamics.
  • Aging rate increases with stronger attraction.
  • Sudden reduction in attraction strength induces non-monotonic evolution (Kovacs effect) before eventual convergence to equilibrium.

Conclusions:

  • The study reveals a Kovacs-like effect in colloidal gels upon attraction strength reduction.
  • Non-monotonic aging arises from particle population dispersion in adjusting to new attraction strengths.
  • The developed model successfully reproduces experimental observations, providing insights into gel aging mechanisms.