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Related Concept Videos

Colloids03:22

Colloids

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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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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Colloidal precipitates01:09

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Structuring colloidal gels via micro-bubble oscillations.

K W Torre1, J de Graaf1

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Soft Matter
|March 29, 2023
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Summary
This summary is machine-generated.

Oscillating microbubbles can locally order colloidal gels, forming hexagonal structures. Simulations matched experimental short-range ordering but not the long-range effects, suggesting fluid flow is key for future models.

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Area of Science:

  • Soft Matter Physics
  • Colloidal Science
  • Computational Physics

Background:

  • Colloidal gels are complex fluids with arrested dynamics.
  • Precise control over micromechanical and rheological properties is crucial.
  • Acoustic modulation of microbubbles can induce local ordering in gels.

Purpose of the Study:

  • To investigate the mechanical influence of oscillating microbubbles on colloidal gel structure.
  • To understand the short-range structural modifications induced by microbubble oscillations.

Main Methods:

  • Brownian dynamics simulations were employed.
  • The focus was on the colloidal gel structure adjacent to the microbubble.
  • Simulations modeled the effect of an oscillating microbubble.

Main Results:

  • Hexagonal-close-packed structures were observed around the microbubble.
  • The range of ordering was comparable to the microbubble's oscillation amplitude.
  • Simulations did not reproduce the long-range structural modifications seen in experiments.

Conclusions:

  • Microbubble oscillations induce local ordering in colloidal gels.
  • Current simulation models may need to incorporate long-range effects like fluid flow.
  • Further research should explore the role of fluid dynamics in microbubble-induced gel restructuring.