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Colloids03:22

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Fast and Sensitive Colloidal Coomassie G-250 Staining for Proteins in Polyacrylamide Gels
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Plasticity in colloidal gel strands.

Joanne E Verweij1, Frans A M Leermakers1, Joris Sprakel1

  • 1Physical Chemistry and Soft Matter, Wageningen University, Stippeneng 4, 6708 WE, Wageningen, The Netherlands. jasper.vandergucht@wur.nl.

Soft Matter
|July 23, 2019
PubMed
Summary
This summary is machine-generated.

Colloidal gel strands exhibit plastic deformation and ductile failure under repeated stress, challenging brittle rupture models. Particle rearrangement within strands causes softening and eventual necking, revealing a new failure mechanism.

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Colloidal Systems

Background:

  • Colloidal gels form space-spanning networks crucial for their mechanical properties.
  • The behavior of individual gel strands significantly influences overall gel response.
  • Existing models often assume brittle rupture of gel strands as the primary failure mode.

Purpose of the Study:

  • To investigate the mechanical response of colloidal gel strands under repeated deformations.
  • To elucidate the failure mechanisms of individual colloidal gel strands.
  • To compare simulation findings with existing theoretical models of gel failure.

Main Methods:

  • Brownian dynamics simulations were employed to model single strands of aggregated colloidal particles.
  • Simulations focused on the behavior of strands subjected to cyclic or repeated deformations.
  • Parameters such as strand thickness, length, and inter-particle interaction potentials were varied.

Main Results:

  • Colloidal gel strands demonstrate significant plastic deformation before failure, contradicting brittle rupture assumptions.
  • Particle rearrangement within strands leads to plastic lengthening and softening.
  • Ductile failure, including strand necking, was observed and found to be independent of strand dimensions and interaction potential range/strength.

Conclusions:

  • The study reveals a ductile failure mechanism for colloidal gel strands involving plastic deformation and necking.
  • This mechanism challenges the conventional view of brittle rupture in colloidal gels.
  • Strand rupture likelihood increases with longer, thinner strands and longer-ranged interactions.