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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

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...
The Colloidal State01:29

The Colloidal State

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...
Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
Colloids and Suspensions01:17

Colloids and Suspensions

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...
Colloids03:22

Colloids

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...
Coagulation01:06

Coagulation

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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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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How Péclet number affects microstructure and transient cluster aggregation in sedimenting colloidal suspensions.

A Moncho-Jordá1, A A Louis, J T Padding

  • 1Biocolloid and Fluid Physics Research Group, Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Granada, Campus Fuentenueva S/N, 18071 Granada, Spain. moncho@ugr.es

The Journal of Chemical Physics
|February 25, 2012
PubMed
Summary
This summary is machine-generated.

The Péclet number (Pe) influences colloidal particle sedimentation velocity and cluster behavior. Higher Pe numbers lead to monotonic velocity decrease and reduced cluster formation, shifting behavior from equilibrium-like to non-equilibrium.

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Area of Science:

  • Colloid Science
  • Soft Matter Physics
  • Computational Chemistry

Background:

  • Colloidal particle sedimentation is influenced by particle interactions and flow conditions.
  • Understanding non-equilibrium behavior in colloidal systems is crucial for various applications.

Purpose of the Study:

  • To investigate the effect of Péclet number (Pe) on the steady-state sedimentation of colloidal particles with short-ranged attractions.
  • To analyze how varying Pe influences sedimentation velocity, particle correlations, and transient cluster dynamics.

Main Methods:

  • Hybrid molecular dynamics simulations were employed.
  • The study systematically varied the Péclet number and packing fraction (φ).

Main Results:

  • Sedimentation velocity showed a non-monotonic dependence on φ at low Pe, transitioning to a monotonic decrease at high Pe.
  • Pair correlation functions deviated from equilibrium values as Pe increased.
  • Transient clusters were observed, with increased fragmentation and decreased aggregation at higher Pe.

Conclusions:

  • The Péclet number significantly alters sedimentation behavior and cluster dynamics in colloidal suspensions.
  • The system transitions from equilibrium-like to non-equilibrium behavior with increasing Pe due to the balance of convective and thermal forces.
  • Cluster formation probability decreases with increasing Pe, while cluster lifetime remains largely unaffected.