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Multiscale heterogeneous dynamics in two-dimensional glassy colloids.

Raffaele Pastore1, Fabio Giavazzi2, Francesco Greco1

  • 1Department of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le Tecchio 80, Napoli 80125, Italy.

The Journal of Chemical Physics
|April 30, 2022
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Summary
This summary is machine-generated.

Differential Dynamic Microscopy (DDM) effectively measures colloidal glass dynamics across multiple scales. This technique reveals complex relaxation processes and dynamical heterogeneities, offering a convenient tool for studying glassy systems.

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Area of Science:

  • Soft Matter Physics
  • Colloidal Science
  • Glassy Dynamics

Background:

  • Dense colloids exhibit significant slowdowns near the glass transition with minimal structural changes.
  • Traditional microscopy and scattering methods probe particle motion in real or reciprocal space, respectively, making multiscale studies challenging.
  • Studying glassy dynamics requires analyzing phenomena across various time and length scales.

Purpose of the Study:

  • To demonstrate Differential Dynamic Microscopy (DDM) as an effective method for measuring collective dynamics in glassy colloids over a range of wavevectors (q) in a single experiment.
  • To analyze the complex relaxation processes occurring in two-dimensional hard-sphere colloids as a function of area fraction (ϕ).
  • To extend DDM's capability to measure dynamical susceptibility (χ₄(q, t)) for probing dynamical heterogeneities.

Main Methods:

  • Utilized two-dimensional hard-sphere colloids at varying area fractions (ϕ).
  • Applied Differential Dynamic Microscopy (DDM) to measure collective dynamics across a spectrum of wavevectors (q).
  • Fitted intermediate scattering functions to a sum of two stretched-exponential decays to characterize relaxation processes.

Main Results:

  • Observed a transition from single to two-component relaxation as area fraction (ϕ) increased.
  • Characterized the slow relaxation process with a diffusion coefficient DL exhibiting power-law scaling DL∼(ϕc-ϕ)2.8, with critical area fraction ϕc ≃ 0.81.
  • Identified a fast relaxation process with non-Brownian time scaling and a wavevector-dependent amplitude, while the short-time diffusion coefficient Dcage showed negligible dependence on ϕ.
  • Successfully extended DDM to measure the q-dependent dynamical susceptibility (χ₄(q, t)).

Conclusions:

  • Differential Dynamic Microscopy (DDM) is a versatile and convenient technique for studying the multiscale dynamics of colloidal glasses.
  • DDM provides insights into both collective relaxation processes and dynamical heterogeneities.
  • The study elucidates the complex dynamics of glassy systems, particularly the interplay between caging, particle escape, and non-Brownian motion.