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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...
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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...
Coagulation01:06

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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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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...
Colloids and Suspensions01:17

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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...
Ion Exchange01:17

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...

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Updated: May 8, 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

Reentrant phase behavior in active colloids with attraction.

Gabriel S Redner1, Aparna Baskaran, Michael F Hagan

  • 1Martin Fisher School of Physics, Brandeis University, Waltham, Massachusetts, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 16, 2013
PubMed
Summary
This summary is machine-generated.

Self-propelled colloids with attractive interactions show reentrant phase behavior, transitioning between separated and homogeneous states as activity changes. This study explores the dynamics of this complex active matter system.

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Synthesis and Characterization of Supramolecular Colloids
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Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Area of Science:

  • Physics
  • Soft Matter Physics
  • Statistical Mechanics

Background:

  • Recent experiments motivate the study of active matter systems.
  • Self-propelled colloids with short-range attraction confined to a surface exhibit complex phase behavior.
  • Understanding the reentrant phase behavior in active matter is crucial.

Purpose of the Study:

  • To investigate the reentrant phase behavior of self-propelled colloids with attractive interactions.
  • To elucidate the physical origins of reentrance using simulations and kinetic modeling.
  • To characterize the diverse kinetics of phase separation in active particle systems.

Main Methods:

  • Utilizing particle-based simulations to model the system's behavior.
  • Developing a kinetic model to capture steady-state dynamics.
  • Analyzing phase separation kinetics, including nucleation, growth, and coarsening.

Main Results:

  • Observed reentrant phase behavior as a function of particle activity.
  • Identified homogeneous active fluid states between low- and high-activity phase-separated regimes.
  • Characterized varied phase separation kinetics, from nucleation and growth to active particle gel coarsening.

Conclusions:

  • The reentrant phase behavior is a key characteristic of this active matter system.
  • Kinetic modeling provides insight into the physical mechanisms driving reentrance.
  • The study reveals complex dynamics in active particle gels and phase separation processes.