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The Colloidal State01:29

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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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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Published on: May 20, 2014

Shear-driven solidification of dilute colloidal suspensions.

Alessio Zaccone1, Daniele Gentili, Hua Wu

  • 1Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland.

Physical Review Letters
|April 27, 2011
PubMed
Summary
This summary is machine-generated.

Shear stress causes dilute colloidal suspensions to solidify by forming and breaking large clusters. Upon stopping flow, these clusters form grainy bonds, creating a rigid structure similar to gels and jammed systems.

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Synthesis and Characterization of Supramolecular Colloids
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Area of Science:

  • Colloid and Surface Science
  • Rheology
  • Soft Matter Physics

Background:

  • Dilute colloidal suspensions exhibit complex behaviors under shear.
  • Understanding shear-induced solidification is crucial for material design.

Purpose of the Study:

  • To elucidate the mechanism of shear-induced solidification in dilute charge-stabilized colloids.
  • To investigate the role of non-Brownian clusters in the solidification process.

Main Methods:

  • Simulations or experimental observations of colloidal suspensions under shear flow.
  • Analysis of cluster formation, breakage, and interconnectivity dynamics.
  • Characterization of the resulting solid-like state.

Main Results:

  • Shear induces the formation and breakage of large, non-Brownian clusters.
  • Cluster size is limited by breakage, while number density increases with shearing.
  • Flow cessation leads to cluster interconnectivity via grainy bonds, forming a rigid state.

Conclusions:

  • Shear-induced solidification arises from the interplay of cluster dynamics and inter-cluster bonding.
  • The process combines aspects of gelation in Brownian systems and jamming in athermal systems.
  • This provides a new framework for understanding solidification in colloidal suspensions.