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Excess entropy and long-time diffusion in colloidal fluids with short-range interparticle attraction.

Xiaoguang Ma1, Jiachen Liu1, Yikang Zhang1

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This study reveals that stronger attractions in colloidal suspensions lead to increased order and slower diffusion. The excess entropy scaling law accurately predicts the relationship between structure and dynamics in these temperature-tuned systems.

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Area of Science:

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

Background:

  • Colloidal suspensions are model systems for studying liquid-like behavior.
  • Tuning interparticle interactions is crucial for controlling material properties.
  • Short-range attractions can be introduced using depletants like surfactant micelles.

Purpose of the Study:

  • To experimentally investigate the liquid structure and dynamics of colloidal suspensions with tunable short-range attractions.
  • To explore the relationship between structural order, dynamics, and excess entropy.
  • To validate the excess entropy scaling law in temperature-tuned colloidal systems.

Main Methods:

  • Utilized video optical microscopy and particle tracking to monitor colloidal particle trajectories.
  • Quantified structural properties using the particle pair correlation function, g(r).
  • Analyzed dynamical behavior via mean square displacement and long-time diffusion coefficients.

Main Results:

  • Increased short-range attraction resulted in enhanced structural order, as indicated by g(r) and excess entropy (S2).
  • Stronger attractions correlated with slower long-time diffusion and heterogeneous dynamics at intermediate timescales.
  • The predicted exponential relationship between excess entropy and diffusivity was confirmed across all samples.

Conclusions:

  • Short-range attractions significantly influence both the structure and dynamics of colloidal fluids.
  • The excess entropy scaling law provides a robust framework for understanding structure-dynamics relationships in these systems.
  • In situ temperature tuning of depletant length offers a versatile method for controlling colloidal interactions.