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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 Colloidal State01:29

The Colloidal State

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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...
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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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Silicone oil emulsions stabilized by polymers and solid particles.

Masami Kawaguchi1

  • 1Division of Chemistry for Materials, Graduate School of Engineering, Mie University, 1577 Kurimamachiya, Tsu, Mie 514-8507, Japan.

Advances in Colloid and Interface Science
|July 15, 2015
PubMed
Summary

This review shows that increasing emulsifier concentration in silicone oil emulsions consistently reduces droplet size and enhances stability. Polymer concentration is key for polymeric emulsifiers, impacting emulsion properties.

Keywords:
Emulsion stabilityPolymersRheological propertiesSilicone oil emulsionsSolid particlesSolid particles with pre-adsorbed polymers

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Rheology

Background:

  • Silicone oil emulsions are widely used but their stability and flow properties depend heavily on the emulsifier used.
  • Various emulsifiers, including polymers, solid particles, and combinations, influence emulsion characteristics.
  • Understanding these relationships is crucial for tailoring emulsion performance.

Purpose of the Study:

  • To review emulsion stability and rheological properties of silicone oil emulsions stabilized by different emulsifiers.
  • To analyze the impact of emulsifier concentration on droplet size and stability.
  • To establish criteria for preparing stable emulsions using polymeric emulsifiers.

Main Methods:

  • Review of studies on silicone oil emulsions stabilized by polymers, solid particles, and particles with pre-adsorbed surfactants/polymers.
  • Analysis of emulsion stability and rheological data as a function of emulsifier concentration.
  • Investigation of emulsifier adsorption effects on emulsion properties.

Main Results:

  • Emulsifier concentration increase universally decreases droplet size and increases emulsion stability.
  • Polymer overlapping concentration serves as a preparation criterion for polymeric emulsifiers.
  • Pre-adsorbed polymers on silica particles significantly improve emulsion stability and control droplet size.

Conclusions:

  • Emulsifier concentration is a critical factor for controlling silicone oil emulsion stability and droplet size.
  • Polymeric emulsifiers offer predictable control over emulsion properties.
  • Hybrid emulsifier systems (particles with adsorbed polymers) provide enhanced stability and tunable properties.