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Related Concept Videos

Colloids03:22

Colloids

21.5K
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...
21.5K
Colloids and Suspensions01:17

Colloids and Suspensions

3.6K
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...
3.6K
Colloidal precipitates01:09

Colloidal precipitates

6.6K
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...
6.6K
Coagulation01:06

Coagulation

1.5K
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...
1.5K
Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

6.9K
In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
6.9K

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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
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Driving dynamic colloidal assembly using eccentric self-propelled colloids.

Zhan Ma1, Qun-Li Lei, Ran Ni

  • 1School of Chemical and Biomedical Engineering, Nanyang Technological University, 637459, Singapore. r.ni@ntu.edu.sg.

Soft Matter
|November 17, 2017
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Summary
This summary is machine-generated.

Active particles with high eccentricity and self-propulsion can drive passive colloids into dense clusters, causing dynamic demixing. This phenomenon, observed in simulations, offers new routes for creating responsive materials.

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Area of Science:

  • Soft matter physics
  • Active matter physics
  • Colloidal self-assembly

Background:

  • Designing dynamic self-assembly protocols is crucial for responsive materials.
  • Active particles offer unique possibilities for controlling passive components.

Purpose of the Study:

  • Investigate dynamic demixing in mixtures of passive colloids and active particles.
  • Explore the role of active particle eccentricity and self-propulsion.

Main Methods:

  • Computer simulations were employed to model particle interactions.
  • Analysis focused on particle dynamics and phase behavior.

Main Results:

  • High eccentricity and self-propulsion in active particles induce dense dynamic clusters of passive colloids.
  • A novel dynamic demixing transition was observed.
  • Re-entrant mixing behavior was identified with varying density.

Conclusions:

  • Active particles can effectively direct the self-assembly of passive colloids.
  • This work provides a new strategy for fabricating dynamic responsive materials using active matter.