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Related Concept Videos

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...
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...
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...
Surface Tension of Fluid01:22

Surface Tension of Fluid

Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies with...
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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Related Experiment Video

Updated: Jun 13, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
10:56

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Patchy Bubble-Propelled Colloids at Interfaces.

David P Rivas1, Max Sokolich1, Harrison Muller1

  • 1Department of Mechanical Engineering, University of Delaware, 130 Academy Street, Newark, DE 19716, USA.

Advanced Materials Interfaces
|June 12, 2026
PubMed
Summary
This summary is machine-generated.

Magnetically steerable active colloids at liquid-air interfaces propel via bubble production. Patchy colloids offer smoother motion and precise micro-manipulation capabilities compared to Janus colloids.

Keywords:
active colloidsbubble-propelledinterfacemicro-assemblymicromanipulationmicrorobots

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A Microfluidic System with Surface Patterning for Investigating Cavitation Bubble(s)&#8211;Cell Interaction and the Resultant Bioeffects at the Single-cell Level
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A Microfluidic System with Surface Patterning for Investigating Cavitation Bubble(s)–Cell Interaction and the Resultant Bioeffects at the Single-cell Level

Published on: January 10, 2017

Related Experiment Videos

Last Updated: Jun 13, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
10:56

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

A Microfluidic System with Surface Patterning for Investigating Cavitation Bubble(s)&#8211;Cell Interaction and the Resultant Bioeffects at the Single-cell Level
11:14

A Microfluidic System with Surface Patterning for Investigating Cavitation Bubble(s)–Cell Interaction and the Resultant Bioeffects at the Single-cell Level

Published on: January 10, 2017

Area of Science:

  • Colloid science
  • Active matter physics
  • Interfacial phenomena

Background:

  • Liquid-air interfaces are crucial in natural and industrial systems like emulsions and foams.
  • Active particles at interfaces exhibit unique phenomena and offer controllable applications, yet research is limited.
  • Self-propelling colloids at interfaces are of interest for advanced applications.

Purpose of the Study:

  • To investigate magnetically steerable active colloids at liquid-air interfaces.
  • To compare the performance of patchy colloids with catalytic coatings to Janus colloids.
  • To explore novel phenomena like interfacial positive gravitaxis in active colloids.

Main Methods:

  • Synthesis and characterization of patchy and Janus colloids with catalytic coatings.
  • Observation of bubble formation, dynamics, and colloid motion at liquid-air interfaces.
  • Demonstration of micro-manipulation and pattern assembly using active colloids.

Main Results:

  • Patchy colloids produce smaller bubbles and exhibit smoother motion than Janus colloids.
  • Existing theories inadequately describe the propulsion and bubble bursting mechanisms of these colloids.
  • Active colloids display interfacial positive gravitaxis towards droplet edges due to force imbalances.

Conclusions:

  • Patchy colloids are advantageous for precise micro-manipulation tasks at interfaces.
  • Further theoretical development is needed to fully understand active colloid behavior at interfaces.
  • Active colloids exhibit novel interfacial behaviors, expanding their application potential.