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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...
Colloids and Suspensions01:17

Colloids and Suspensions

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...
Colloidal precipitates01:09

Colloidal precipitates

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...
Colloids03:22

Colloids

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

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

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 concentration...
Phase Diagrams of Ternary Systems01:28

Phase Diagrams of Ternary Systems

Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...

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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Published on: May 20, 2014

Phase behavior of dense colloidal binary monolayers.

L J Bonales1, F Martínez-Pedrero, M A Rubio

  • 1Departamento de Química Física I, Facultad de Química, Universidad Complutense, 28040 Madrid, Spain.

Langmuir : the ACS Journal of Surfaces and Colloids
|November 10, 2012
PubMed
Summary
This summary is machine-generated.

Binary colloidal monolayers transition to a glassy state as particle size concentration changes. Equimolar mixtures form homogeneous binary glasses, offering a model for vitrification studies.

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Colloidal Systems

Background:

  • Understanding the formation and properties of glasses is crucial in materials science.
  • Binary colloidal systems offer a tunable platform to study phase transitions and glass formation.
  • The role of particle size and concentration in structuring colloidal monolayers requires further investigation.

Purpose of the Study:

  • To investigate structure development in 2D dense binary colloidal monolayers.
  • To analyze the influence of relative small/large particle concentration on phase transitions and order.
  • To establish binary systems as a reliable model for studying glass formation.

Main Methods:

  • Utilized translational and orientational distribution functions to monitor phase transitions.
  • Characterized global and local order parameters.
  • Performed calculations relating observed structures to pair dipolar potential.

Main Results:

  • Observed a continuous vitrification process with increasing concentration of different-sized particles.
  • Identified the formation of homogeneous binary glasses in equimolar mixtures.
  • Successfully forecasted local structures in arbitrary binary mixtures using a simple calculation based on dipolar potential.

Conclusions:

  • The relative concentration of small and large particles dictates structure development in 2D binary colloidal monolayers.
  • Binary colloidal systems exhibit a continuous vitrification process and form homogeneous glasses, validating their use as a glass-forming model.
  • The pair dipolar potential is a useful predictor of local structures in these systems.