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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...

Symmetric Member in Bending

Symmetric Member in Bending

In the study of the mechanics of materials, analyzing the behavior of prismatic members under opposing couples is crucial for understanding internal stress distributions, which are essential for structural design. When subjected to couples, a prismatic member experiences internal forces that maintain equilibrium. A couple, characterized by two equal and opposite forces, creates a moment but no resultant force. The internal forces at any section cut of the member must balance these external...

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...

Deformations in a Symmetric Member in Bending

Deformations in a Symmetric Member in Bending

When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...

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...

Beams with Symmetric Loadings

Beams with Symmetric Loadings

The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
The M/EI...

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Related Experiment Video

Updated: Feb 13, 2026

Tangential Flow Ultrafiltration: A “Green” Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles

Tangential Flow Ultrafiltration: A “Green” Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles

Published on: October 4, 2012

Symmetrical Catalytically Active Colloids Collectively Induce Convective Flow.

David A Gregory¹, Stephen J Ebbens¹

¹Department of Chemical and Biological Engineering , University of Sheffield , S3 1JD Sheffield , U.K.

Langmuir : the ACS Journal of Surfaces and Colloids

|March 22, 2018

Summary

Symmetrical catalytic colloids create collective flow, enhancing mass transport. This activity-induced convection, driven by chemical reactions, has potential for fluidic applications.

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Last Updated: Feb 13, 2026

Tangential Flow Ultrafiltration: A “Green” Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles

Tangential Flow Ultrafiltration: A “Green” Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles

Published on: October 4, 2012

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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Published on: May 20, 2014

Preparation and 3D Tracking of Catalytic Swimming Devices

Preparation and 3D Tracking of Catalytic Swimming Devices

Published on: July 1, 2016

Area of Science:

Colloid science
Chemical engineering
Fluid dynamics

Background:

Focus on Janus colloids for fluidic applications overlooks symmetrical counterparts.
Isotropically active colloids are more accessible and used in heterogeneous catalysis.

Purpose of the Study:

Systematically investigate the motion of symmetrical, platinum-coated colloids.
Explore collective convective flow induced by isotropic catalytic activity.

Main Methods:

Utilized platinum-coated colloids decomposing hydrogen peroxide.
Employed particle tracking to quantify ballistic velocities and persistence lengths.
Varied colloidal volume fraction to observe flow onset and characteristics.

Main Results:

Observed collective convective flow above a critical colloidal volume fraction.
Ballistic velocities and Péclet numbers increased with volume fraction.
Correlated convective flow magnitude with catalytic activity per unit volume.

Conclusions:

Chemical activity-induced local density differences drive collective flow.
Convection offers a simple method to enhance mass transport rates.
Activity-induced convection is relevant for fluidic applications and studying self-motile systems.