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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...

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Updated: Jul 5, 2025

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

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Published on: November 4, 2021

Morphology-Tailored Dynamic State Transition in Active-Passive Colloidal Assemblies.

Nan Yu^1,2, Zameer H Shah^1,2, Mingcheng Yang^3,4,5

¹Institute for Advanced Study, Shenzhen University, 518060, Shenzhen, China.

Research (Washington, D.C.)

|January 25, 2024

Summary

This summary is machine-generated.

Researchers discovered new dynamic behaviors in mixtures of active and passive colloidal particles by tuning their shapes and sizes. These findings offer strategies for controlling active matter systems for novel applications.

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Area of Science:

Colloid and interface science
Soft matter physics
Active matter systems

Background:

Active and passive colloidal mixtures offer complex states beyond equilibrium thermodynamics.
Controlling dynamic transitions in these systems remains a significant challenge.

Purpose of the Study:

To explore diverse dynamic behaviors in active-passive colloidal assemblies.
To investigate the role of particle morphology and size in dictating dynamic states.
To establish controllable transition strategies between different dynamic regimes.

Main Methods:

Utilizing chemically propelled snowman-like active colloids and passive spherical particles.
Systematically tuning particle shape, size, and composition.
Comparing experimental observations with mesoscale dynamics simulations.

Main Results:

Observed distinct translating and orbiting states for active-passive assemblies (1:1 ratio).
Revealed persistent "8"-like cyclic motion and hopping dynamics for assemblies with one active and two passive particles.
Demonstrated morphology-tailored transitions controlled by active colloid shape and passive particle size.

Conclusions:

Disclosed a variety of novel dynamic states in active-passive colloidal systems.
Established morphology-dependent transition strategies for dynamic control.
Highlighted potential applications in developing advanced micromachines with unprecedented functions.