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Related Concept Videos

Colloids03:22

Colloids

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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...
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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...
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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...
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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Cooperative Allosteric Transitions

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Binary colloidal systems with competing interactions: structural transitions and ordering.

Sergio Apolinario1

  • 1Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 18, 2025
PubMed
Summary

This study explores binary colloidal systems with unique modified mermaid potentials, revealing diverse self-assembled structures like stripes and radial segregation due to competing interactions and confinement.

Keywords:
binary colloidal systemscompeting interactionsmodified mermaid potentialshort-range attraction and long-range repulsion (SALR)

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Area of Science:

  • Soft matter physics
  • Colloidal science
  • Computational physics

Background:

  • Colloidal systems with competing interactions display complex self-assembly.
  • Understanding these structures is key for soft matter physics.
  • Binary systems offer tunable complexity.

Purpose of the Study:

  • Investigate structural transitions in a binary colloidal system.
  • Explore effects of modified short-range attraction and long-range repulsion (SALR) potential.
  • Analyze influence of confinement and interaction asymmetry.

Main Methods:

  • Overdamped Langevin dynamics simulations.
  • Modeling particles with a modified mermaid potential (neutral zone, attractive well, repulsive barrier).
  • Varying interaction parameters and harmonic confinement strength.

Main Results:

  • Observed diverse phase behavior including alternating stripes and radial segregation.
  • Identified locally ordered square motifs and central crystalline domains.
  • Demonstrated structural motifs arising from interaction asymmetry and confinement.

Conclusions:

  • Modified mermaid potentials lead to rich self-assembled structures in binary colloidal systems.
  • Interaction asymmetry and confinement are crucial drivers of emergent order.
  • Findings guide experimental realization of specific colloidal interactions.