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Related Concept Videos

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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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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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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Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller subatomic particles: protons, neutrons, and electrons. These three particles account for the mass and the charge of an atom.
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Related Experiment Video

Updated: Feb 15, 2026

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles
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Capture of colloidal particles by a moving microfluidic bubble.

Irma Liascukiene1, Gabriel Amselem1, Deniz Z Gunes2

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Particle adsorption stabilizes foams, but mechanisms in confined flows are unclear. Optimal foam coverage occurs with 1 μm particles in specific flow conditions, influenced by particle size, concentration, and flow velocity.

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Area of Science:

  • Colloid and Surface Science
  • Microfluidics
  • Foam Stabilization

Background:

  • Foams are stabilized by particle adsorption at liquid-gas interfaces.
  • Mechanistic understanding of particle adsorption in confined flows is limited due to experimental challenges.

Purpose of the Study:

  • To characterize micron-scale particle adsorption onto bubble interfaces in microfluidic channels.
  • To investigate the influence of particle size, concentration, and flow velocity on adsorption dynamics.

Main Methods:

  • Utilized microfluidic channels to create confined gas-liquid dispersions.
  • Systematically varied particle size (micron-scale), particle concentration, and suspension velocity.
  • Observed particle behavior and bubble coverage along the channel length.

Main Results:

  • Bubble coverage increased linearly with channel position, with the rate dependent on all varied parameters.
  • Optimal coverage achieved with 1 μm particles at low flow rates and high concentrations.
  • Particle trajectories through channel gutters and sedimentation effects influenced coverage, with aggregates improving coverage for larger particles.

Conclusions:

  • Demonstrated that particle size, concentration, and flow velocity critically affect foam stabilization in confined microfluidic systems.
  • Identified specific conditions for optimal particle adsorption and coverage.
  • Provided insights into boundary effects on particle adsorption at air-liquid interfaces.