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Related Concept Videos

The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...

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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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Multiple dynamic regimes in concentrated microgel systems.

David A Sessoms1, Irmgard Bischofberger, Luca Cipelletti

  • 1Department of Physics, University of Fribourg, Fribourg, Switzerland.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|November 26, 2009
PubMed
Summary
This summary is machine-generated.

We studied microgel dynamics and found a fluid-solid transition. Further increases in packing fraction led to

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Rheology

Background:

  • Microgel systems exhibit complex collective relaxation dynamics.
  • Packing fraction significantly influences mechanical properties and transitions.
  • Understanding dynamical heterogeneities is crucial for soft matter systems.

Purpose of the Study:

  • Investigate dynamical heterogeneities in concentrated microgels.
  • Characterize the fluid-solid transition and its effect on spatial correlations.
  • Identify transitions related to packing fraction and stress-driven dynamics.

Main Methods:

  • Controlled variation of microgel packing fraction via temperature changes.
  • Measurement of mechanical properties (storage and loss moduli).
  • Analysis of spatial correlations in collective dynamics.

Main Results:

  • A fluid-solid transition was observed with increasing packing fraction.
  • Spatial correlation range (xi) increased approaching the transition, then decreased after a second transition.
  • A second transition to 'squeezed' states was identified, marked by stress-driven dynamics and coupled moduli.

Conclusions:

  • Microgel dynamics show a non-monotonic dependence of spatial correlations on volume fraction.
  • The second transition signifies a shift from thermal to stress-driven dynamics.
  • This study provides the first observation of qualitative changes in dynamical heterogeneity during this transition.