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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...
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid 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...
Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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...

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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions
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Temperature-sensitive colloidal phase behavior induced by critical Casimir forces.

Minh Triet Dang1, Ana Vila Verde, Van Duc Nguyen

  • 1Van der Waals-Zeeman Institute, University of Amsterdam, Amsterdam, The Netherlands.

The Journal of Chemical Physics
|September 14, 2013
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Summary
This summary is machine-generated.

Monte Carlo simulations reveal colloidal phase behavior in binary solvents. Agreement with experiments is good off-critical but worsens near critical composition, highlighting many-body effects.

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Area of Science:

  • Physical Chemistry
  • Colloid Science
  • Computational Physics

Background:

  • Colloidal suspensions exhibit complex phase behavior influenced by solvent properties.
  • Understanding these phase transitions is crucial for materials science and nanotechnology.
  • Near-critical binary solvents introduce unique thermodynamic conditions affecting colloidal systems.

Purpose of the Study:

  • To investigate the phase behavior of colloidal suspensions in near-critical binary solvents.
  • To compare simulation results with experimental data to understand the role of many-body effects.
  • To explore the applicability of the principle of corresponding states to colloidal systems.

Main Methods:

  • Monte Carlo simulations were employed to model the colloidal suspensions.
  • Effective pair potentials derived from experimental data were utilized.
  • Phase diagrams were calculated and compared against experimental measurements.

Main Results:

  • Simulations accurately predicted the experimental phase diagram at off-critical solvent compositions.
  • A discrepancy between simulation and experiment emerged near the critical solvent composition.
  • The colloidal phase diagram showed qualitative similarity to molecular systems and obeyed the principle of corresponding states.

Conclusions:

  • Many-body effects are less significant at off-critical solvent compositions.
  • Many-body effects become increasingly important near the critical solvent composition.
  • Colloidal phase behavior in these systems occurs within a narrow temperature range below solvent phase separation.