Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Foam and wetting films: electrostatic and steric stabilization.

D Exerowa1, N V Churaev, T Kolarov

  • 1Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria. exerowa@ipchp.ipc.bas.bg

Advances in Colloid and Interface Science
|June 24, 2003
PubMed
Summary

Foam and wetting films stabilized by surfactants exhibit different behaviors based on concentration and electrolyte levels. Electrostatic and steric forces govern stability, with asymmetric wetting films showing unique properties due to boundary conditions.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Foam, emulsion and wetting films stabilized by polyoxyalkylated diethylenetriamine (DETA) polymeric surfactants.

Advances in colloid and interface science·2011
Same author

Electrostatic and steric interactions in oil-in-water emulsion films from Pluronic surfactants.

Advances in colloid and interface science·2011
Same author

Effect of rhamnolipids on pulmonary surfactant foam films.

Langmuir : the ACS journal of surfaces and colloids·2010
Same author

Wetting of low-energy surfaces.

Advances in colloid and interface science·2007
Same author

Surface forces and properties of foam films from rhamnolipid biosurfactants.

Advances in colloid and interface science·2007
Same author

Interaction forces in thin liquid films stabilized by hydrophobically modified inulin polymeric surfactant. 3. Influence of electrolyte type on emulsion films.

Langmuir : the ACS journal of surfaces and colloids·2007

Area of Science:

  • Colloid and Surface Science
  • Physical Chemistry

Background:

  • Thin liquid films, including foam and wetting films, serve as models for understanding interfacial phenomena.
  • Surfactants like CTAB and F108, along with electrolytes, are crucial in controlling film properties.

Purpose of the Study:

  • To compare the stability of symmetric foam films and asymmetric wetting films on quartz using different surfactants.
  • To investigate the role of electrostatic and steric forces in film stabilization.
  • To determine the influence of surfactant concentration and electrolyte concentration on film behavior.

Main Methods:

  • Microinterferometry was employed for precise measurement of film thickness.
  • Analysis of electrostatic potentials at solution/air and solution/quartz interfaces.

Related Experiment Videos

  • Systematic variation of surfactant (CTAB, F108) and electrolyte (NaCl) concentrations.

    • Main Results:

    • CTAB films showed charge reversal at interfaces with increasing concentration, affecting stability; stable films formed at high CTAB concentrations (>2 x 10(-4) mol dm(-3)).
    • F108 films demonstrated a transition from electrostatic to steric stabilization with increasing electrolyte concentration.
    • Foam films were always stable, while wetting films could be stable or unstable depending on solution composition.

    Conclusions:

    • Both electrostatic and steric forces play significant roles in the stability of foam and wetting films.
    • Asymmetric boundary conditions in wetting films lead to distinct properties compared to symmetric foam films.
    • Understanding these forces and conditions is key to controlling thin liquid film behavior.