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The Colloidal State

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...

Colloids and Suspensions

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...

Colloids

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...

Colloidal precipitates

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...

Coagulation

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...

Typical Model Studies

Typical Model Studies

Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.

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Related Experiment Video

Updated: Jun 25, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Simulating (electro)hydrodynamic effects in colloidal dispersions: smoothed profile method.

Y Nakayama¹, K Kim, R Yamamoto

¹Department of Chemical Engineering, Kyushu University, Fukuoka 819-0395, Japan. ynakayama@chem-eng.kyushu-u.ac.jp

The European Physical Journal. E, Soft Matter

|February 21, 2009

Summary

This summary is machine-generated.

The Smoothed Profile (SP) method offers efficient direct numerical simulation for colloidal dispersions. This advanced technique accurately models fluid-colloid interactions in various complex fluids.

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Area of Science:

Computational fluid dynamics
Colloid science
Multiphase flow simulation

Background:

Previous direct simulation schemes for colloidal dispersions in Newtonian solvents have limitations.
Accurate modeling of hydrodynamic interactions in colloidal systems is crucial for understanding their behavior.

Purpose of the Study:

To present an improved formulation, the Smoothed Profile (SP) method, for direct numerical simulation of colloidal dispersions.
To enable simultaneous time-marching for host fluids and colloidal particles.
To extend the method for multicomponent fluids and complex fluid applications.

Main Methods:

The SP method utilizes a smoothed profile for colloidal particles to couple continuum fluid dynamics with rigid-body dynamics.
Simultaneous time-marching is employed for both the fluid and the colloids.
The formulation is extended to handle multicomponent fluids, including electrolyte solutions.

Main Results:

The SP method allows for the study of systems like charged colloids in electrolyte solutions.
Computational cost is comparable to non-particulate flow simulations.
Numerical results validate the method's accuracy in assessing hydrodynamic interactions.

Conclusions:

The SP method provides an efficient and versatile tool for simulating colloidal dispersions.
It is applicable to a wide range of fluids, including complex fluids, without restrictions on constitutive models.
This advancement facilitates the study of intricate colloidal system dynamics.