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Related Concept Videos

Colloids03:22

Colloids

20.8K
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...
20.8K
Colloids and Suspensions01:17

Colloids and Suspensions

3.1K
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...
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Distribution and Dispersion00:54

Distribution and Dispersion

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To understand intra-specific interactions in populations, scientists measure the spatial arrangement of species individuals. This geographic arrangement is known as the species distribution or dispersion. Highly territorial species exhibit a uniform distribution pattern, in which individuals are spaced at relatively equal distances from one another. Species that are highly tied to particular resources, such as food or shelter, tend to concentrate around those resources, and thus exhibit a...
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Colloidal precipitates01:09

Colloidal precipitates

5.9K
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...
5.9K
Classifying Matter by Composition03:35

Classifying Matter by Composition

89.6K
Matter: Pure Substances and Mixtures
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures. 
A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated. 
A mixture is composed of two or...
89.6K
Concentration Cells02:41

Concentration Cells

25.6K
A concentration cell is a type of a  voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species.
Consider the following voltaic cell:
25.6K

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Related Experiment Video

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Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
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Dynamic clustering and re-dispersion in concentrated colloid-active gel composites.

G Foffano1, J S Lintuvuori2, K Stratford3

  • 1Laboratoire de Physique Théorique et Modèles Statistiques, Université Paris-Sud, UMR 8626, 91405 Orsay, France.

Soft Matter
|August 20, 2019
PubMed
Summary

Activity in colloidal suspensions drives dynamic particle clustering, even without surface anchoring. Active stresses can also disrupt aggregates, offering new pathways for soft material self-assembly.

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Area of Science:

  • Soft Matter Physics
  • Colloidal Science
  • Active Matter

Background:

  • Concentrated colloidal suspensions are crucial in materials science.
  • Active gels exhibit complex dynamics influenced by self-propelled particles.
  • Understanding particle-liquid crystal interactions is key for material design.

Purpose of the Study:

  • To investigate the dynamics of quasi-two-dimensional colloidal particle suspensions in active gels.
  • To explore the role of activity and surface anchoring on particle aggregation.
  • To assess the potential for self-assembly of novel soft materials.

Main Methods:

  • Computer simulations of quasi-two-dimensional concentrated suspensions.
  • Modeling passive colloidal particles within active fluid environments.
  • Analysis of particle dynamics under varying activity and anchoring conditions.

Main Results:

  • Activity induces dynamic colloidal clustering, independent of surface anchoring.
  • Active stresses compete with elastic forces, leading to re-dispersion of aggregates.
  • Observed phenomena differ from passive colloid-liquid crystal composites.

Conclusions:

  • Quasi-two-dimensional inverse dispersions offer a novel approach to soft material self-assembly.
  • Control over particle aggregation can be achieved through active stresses and anchoring.
  • This work provides insights into designing advanced soft materials with tunable properties.