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Viscoelastic necking dynamics between attractive microgels.

Shensheng Chen1, Emad Pirhadi1, Xin Yong1

  • 1Department of Mechanical Engineering, Binghamton University, The State University of New York, Binghamton, NY 13902, USA.

Journal of Colloid and Interface Science
|March 28, 2022
PubMed
Summary

Microgel coalescence dynamics show a crossover from liquid-like viscous flow to solid-like arrested dynamics. This behavior, governed by polymer stress relaxation, reveals the unique viscoelastic nature of microgels.

Keywords:
Attractive microgelsDissipative particle dynamicsDroplet coalescenceMaxwell modelViscoelasticity

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Area of Science:

  • Soft Matter Physics
  • Polymer Science
  • Colloid Science

Background:

  • Microgels exhibit colloid/polymer duality, deforming and interpenetrating.
  • Microgel interaction in collapsed states depends on interfacial tension and elasticity.
  • Connecting neck dynamics in microgel interaction remain under-explored.

Purpose of the Study:

  • Investigate the temporal evolution of necking dynamics in attractive microgels.
  • Determine if microgel necking exhibits liquid-like or solid-like behavior across scales.
  • Characterize the mechanical strength and coalescence dynamics of microgels.

Main Methods:

  • Dissipative particle dynamics simulations of microgel merging and pinching.
  • Comparison of microgel coalescence with liquid and polymeric droplets.
  • Modeling neck growth using the Maxwell model and steered molecular dynamics for pinch-off analysis.

Main Results:

  • Observed a crossover in coalescence dynamics, indicating microgel viscoelasticity.
  • Early neck expansion showed linear, viscous behavior; late regime exhibited arrested, solid-like dynamics.
  • Analytical model confirmed long-term behavior governed by polymer stress relaxation with exponential growth rate decay.

Conclusions:

  • Microgel necking dynamics display a transition from viscous to solid-like behavior.
  • The findings challenge the notion of purely elastic response at short timescales for viscoelastic materials.
  • Microgel breakup highlights distinct polymeric characteristics.