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Colloids03:22

Colloids

17.9K
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...
17.9K
Solubility03:00

Solubility

18.3K
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).
In a solution, the solute particles (molecules,...
18.3K
Entropy and Solvation02:05

Entropy and Solvation

7.2K
The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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Colloidal precipitates01:09

Colloidal precipitates

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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...
753

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Related Experiment Video

Updated: Sep 11, 2025

Facile Preparation of Internally Self-assembled Lipid Particles Stabilized by Carbon Nanotubes
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Facile Preparation of Internally Self-assembled Lipid Particles Stabilized by Carbon Nanotubes

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Stabilizing Water-in-Water Emulsions Using Oil Droplets.

Jean-Paul Douliez1, Laure Béven1

  • 1Biologie du Fruit et Pathologie, INRAE, Univ. Bordeaux, UMR 1332, F-33140 Villenave d'Ornon, France.

Molecules (Basel, Switzerland)
|August 14, 2025
PubMed
Summary
This summary is machine-generated.

Researchers stabilized water-in-water emulsions using oil droplets, preventing coalescence. Modifying dextran derivatives altered emulsion stability, offering new material chemistry possibilities.

Keywords:
double emulsionstabilizationwater-in-water emulsion

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Area of Science:

  • Materials Chemistry
  • Colloid and Surface Science
  • Polymer Science

Background:

  • Water-in-water (W/W) emulsions are challenging to stabilize due to droplet coalescence.
  • Mimicking complex emulsion systems like W/O/W (water-in-oil-in-water) requires novel stabilization strategies.

Purpose of the Study:

  • To develop a method for stabilizing W/W emulsions using oil-in-water droplets.
  • To investigate the effect of different dextran derivatives on emulsion stability.
  • To explore the potential for creating W/O/W-like structures.

Main Methods:

  • Formation of W/W emulsions using dextran (Dex) and polyethylene glycol (PEG).
  • Addition of hexadecane oil droplets and cetyl trimethyl ammonium bromide (CTAB) for stabilization.
  • Sonication and observation using fluorescently labeled dextran derivatives and Nile red.

Main Results:

  • Oil droplets at the dextran droplet surface successfully prevented W/W emulsion coalescence.
  • Dextran sulfate (DexSulf) enhanced droplet stability, while carboxymethyl dextran (CMDex) and sodium dodecyl sulfate (SDS) caused destabilization.
  • Re-addition of DexSulf or DEAEDex (a cationic dextran derivative) restored stability to destabilized emulsions.
  • Fluorescent labeling confirmed the location of dextran derivatives within or at the droplet interface.

Conclusions:

  • Oil droplet addition is an effective strategy for stabilizing W/W emulsions.
  • The interfacial properties of dextran derivatives critically influence emulsion stability.
  • This approach offers a pathway to creating complex, stable emulsion systems for materials science applications.