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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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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...
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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 visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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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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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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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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Driven binary colloidal mixture in a 2D narrow channel with hard walls.

M Ebrahim Foulaadvand1,2, Bahareh Aghaee3

  • 1Department of Physics, University of Zanjan, P.O. Box 45196-311, Zanjan, Iran. foolad@iasbs.ac.ir.

The European Physical Journal. E, Soft Matter
|March 30, 2016
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Summary

A driven binary colloidal mixture in a narrow channel transitions from homogeneous flow to distinct lanes above a critical force. This laning behavior, influenced by channel width, shows a reentrance effect in confined geometries.

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Flowing Matter: Liquids and Complex Fluids

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Colloidal Science

Background:

  • Investigating confined colloidal systems is crucial for understanding complex fluid behavior.
  • Binary colloidal mixtures exhibit unique phase transitions and dynamics under external forces.
  • Debye-Hückel Coulombic interactions (Yukawa potential) govern inter-particle forces in charged colloids.

Purpose of the Study:

  • To study the properties of a driven equi-molar binary colloidal mixture in a narrow 2D channel.
  • To analyze the transition from homogeneous flow to laning behavior.
  • To understand the influence of channel width and external force on colloidal dynamics.

Main Methods:

  • Simulated a binary colloidal mixture with Brownian motion and Yukawa potential.
  • Applied a constant external force driving particles along a narrow channel.
  • Neglected hydrodynamic interactions, assuming over-damped dynamics.

Main Results:

  • Flow increased nonlinearly with external force, independent of channel width.
  • A homogeneous-to-laning transition occurred above a critical driving force.
  • Mean lane width and laning order parameter increased with channel width, with reentrance effects observed.

Conclusions:

  • The study reveals a critical force-induced transition to lane formation in confined binary colloidal systems.
  • Channel width significantly impacts laning order and exhibits reentrance phenomena.
  • The findings contribute to understanding self-organization in driven soft matter systems.