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Related Concept Videos

Surface Active Agents01:27

Surface Active Agents

124
Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
124
Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

3.1K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
3.1K
Leveling Effect01:29

Leveling Effect

1.6K
In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, the...
1.6K
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

3.0K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
3.0K
Intermolecular Forces and Physical Properties02:56

Intermolecular Forces and Physical Properties

29.8K
29.8K
Common Ion Effect03:24

Common Ion Effect

48.3K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
48.3K

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Related Experiment Video

Updated: Apr 3, 2026

Casting Protocols for the Production of Open Cell Aluminum Foams by the Replication Technique and the Effect on Porosity
09:22

Casting Protocols for the Production of Open Cell Aluminum Foams by the Replication Technique and the Effect on Porosity

Published on: December 11, 2014

15.1K

Ion-specific effects in foams.

Soumyadip Sett1, Stoyan I Karakashev2, Stoyan K Smoukov3

  • 1Department of Mechanical & Industrial Engineering, University of Illinois, 842 West Taylor St, Chicago, IL 60607, USA.

Advances in Colloid and Interface Science
|September 21, 2015
PubMed
Summary
This summary is machine-generated.

Ion-specific effects significantly impact foam stability. Counter-ions can stabilize or destabilize foam films depending on salt concentration, reversing roles based on their position in the Hofmeister series.

Keywords:
Critical micelle concentrationFoam film drainageFoam filmsFoamsIon-specific effects

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Area of Science:

  • Colloid and Surface Science
  • Physical Chemistry
  • Materials Science

Background:

  • Understanding ion-specific effects in surfactant-based foams is crucial for various applications.
  • Existing theoretical models for ionic surfactants are being refined, with new approaches for non-ionic surfactants emerging.
  • The behavior of ions at the air-water interface influences foam properties.

Purpose of the Study:

  • To critically review ion-specific effects in foams with added salts.
  • To present theoretical frameworks for understanding experimental data in ionic and non-ionic surfactant systems.
  • To interpret novel experimental results on ion-specific effects in foam films.

Main Methods:

  • Theoretical review of models for ionic and non-ionic surfactant systems.
  • Experimental investigation of planar foam film stability and drainage.
  • Analysis of sodium dodecyl sulfate (SDS) solutions with varying inorganic salt (LiCl, NaCl, KCl) concentrations.

Main Results:

  • Observed strong ion-specific effects of counter-ions on foam film stability and drainage.
  • Counter-ions exhibited dual behavior: stabilization below a critical concentration and destabilization above it.
  • Destabilization followed the Hofmeister series order, while stabilization showed the reverse order.

Conclusions:

  • Ion-specific effects, particularly from counter-ions, play a critical role in foam film stability and drainage dynamics.
  • A critical surfactant adsorption level unifies the analysis of different salt concentrations, indicating potential salt-induced surfactant precipitation or pre-micellar structure formation.
  • The findings necessitate a nuanced understanding of ion-surfactant interactions for predicting and controlling foam behavior.