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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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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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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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Coagulation01:06

Coagulation

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Solubility03:00

Solubility

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Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
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Surface Tension of Fluid01:22

Surface Tension of Fluid

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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
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Soft Colloidal Particles at Fluid Interfaces.

Eduardo Guzmán1,2, Armando Maestro3,4

  • 1Departamento de Química Física, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain.

Polymers
|March 26, 2022
PubMed
Summary

This review examines soft colloidal particle assembly at fluid interfaces, focusing on microgels. Understanding their dual polymer/colloid nature is key to describing their behavior and interfacial properties.

Keywords:
deformabilityinterfacesinterfacial tensionmicrogelsreconfigurablesoftness

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Area of Science:

  • Colloid and Surface Science
  • Polymer Science
  • Soft Matter Physics

Background:

  • Soft colloidal particles, particularly microgels, exhibit unique dual polymer/colloid characteristics.
  • Their adsorption to fluid interfaces presents challenges for characterization and theoretical modeling.
  • Existing models often fail due to oversimplification, treating microgels as simple colloids.

Purpose of the Study:

  • To critically revise the physicochemical aspects of microgel assembly at fluid interfaces.
  • To highlight the importance of microgel polymer/colloid duality in interfacial behavior.
  • To provide a reliable description of microgel-laden interfaces.

Main Methods:

  • Review of existing experimental characterization techniques for adsorbed microgels.
  • Analysis of theoretical frameworks for describing microgel-interface interactions.
  • Synthesis of findings on individual and collective microgel behaviors at interfaces.

Main Results:

  • Microgel's dual nature significantly influences their interfacial organization and properties.
  • Stimulus responsiveness adds complexity to their behavior at fluid interfaces.
  • Collective behaviors in dense microgel assemblies are governed by their unique characteristics.

Conclusions:

  • A physically reliable description requires acknowledging the polymer/colloid duality of microgels.
  • Understanding this duality is crucial for controlling microgel-laden interface properties and responsiveness.
  • This review consolidates knowledge on microgel assembly for future research.