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Related Concept Videos

Colloids03:22

Colloids

21.4K
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...
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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...
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Colloidal precipitates01:09

Colloidal precipitates

6.5K
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...
6.5K
Rotation of Asymmetric Top01:11

Rotation of Asymmetric Top

1.6K
By definition, a spherically symmetric body has the same moment of inertia about any axis passing through its center of mass. This situation changes if there is no spherical symmetry. Since most rigid bodies are not spherically symmetric, these require special treatment.
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...
1.6K
Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

10.1K
Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
10.1K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.9K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Related Experiment Video

Updated: Feb 16, 2026

Tangential Flow Ultrafiltration: A &ldquo;Green&rdquo; Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles
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Tangential Flow Ultrafiltration: A “Green” Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles

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Computer simulations of heteroaggregation with large size asymmetric colloids.

Aleena Laganapan1, Manuella Cerbelaud1, Riccardo Ferrando2

  • 1Univ. Limoges, CNRS, SPCTS, UMR 7315, F-87000 Limoges, France.

Journal of Colloid and Interface Science
|January 9, 2018
PubMed
Summary

Colloid hetero-aggregation depends on particle size, concentration, and surface properties. Simulations reveal small particle mobility on large ones is key to tuning aggregate structures and suspension stability.

Keywords:
Aggregate structuresBrownian dynamics simulationsColloidal suspensionsHeteroaggregationSize-asymmetric particles

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Synthesis and Characterization of Supramolecular Colloids
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Area of Science:

  • Colloid and surface science
  • Materials science
  • Computational chemistry

Background:

  • Hetero-aggregation of inorganic colloids is complex, influenced by multiple interdependent parameters like concentration, ionic strength, and pH.
  • Experimental studies face challenges in isolating the effect of individual parameters due to their interconnectedness.
  • Numerical simulations offer a powerful tool to dissect these effects and understand suspension behavior.

Purpose of the Study:

  • To investigate the hetero-aggregation of dilute colloidal suspensions with significant size asymmetry using numerical simulations.
  • To analyze the impact of small-particle concentration, surface potentials, and ionic strength on aggregation dynamics.
  • To identify key factors governing the structure and stability of hetero-aggregated colloids.

Main Methods:

  • Brownian dynamics simulations were employed to model dilute suspensions of two colloid populations with large size disparity.
  • Systematic variation of parameters including small-particle concentration, surface potentials, and ionic strength was performed.
  • Analysis focused on the influence of these parameters and particle mobility on aggregate formation.

Main Results:

  • Simulation outcomes demonstrate that hetero-aggregation processes are tunable by adjusting parameters like small-particle concentration and ionic strength.
  • Aggregate structures are predominantly influenced by the surface properties of the smaller particles.
  • The mobility of small particles adsorbed onto larger ones emerged as a critical, previously underappreciated factor.

Conclusions:

  • Hetero-aggregation behavior can be effectively controlled by manipulating particle properties and environmental conditions.
  • The findings provide a mechanistic understanding that reconciles existing experimental observations in colloid science.
  • This work serves as a valuable reference for interpreting future experimental results on colloidal hetero-aggregation.