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

Anionic wormlike micellar fluids that display cloud points: rheology and phase behavior.

Gokul C Kalur1, Srinivasa R Raghavan

  • 1Department of Chemical Engineering, University of Maryland, College Park, Maryland 20742-2111, USA.

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
Summary

Adding specific salts to sodium oleate solutions promotes wormlike micelle growth and increases viscosity. Triethylammonium chloride uniquely induces cloud points and phase separation in these ionic surfactant systems.

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

Hairy Gels: Mimicking the Hair-Covered Architecture and Responses of Animal and Plant Tissues.

ACS applied materials & interfaces·2025
Same author

Switchable Adhesion of Hydrogels to Plant and Animal Tissues.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2024
Same author

Vesicle-micelle transitions driven by ROS, light and heat.

Nanoscale·2024
Same author

Complexity in a Simple Self-Assembling System: Lecithin-Water-Ethanol Mixtures Exhibit a Re-Entrant Phase Transition and a Vesicle-Micelle Transition (VMT) on Heating.

Langmuir : the ACS journal of surfaces and colloids·2024
Same author

Reversibly Sticking Metals and Graphite to Hydrogels and Tissues.

ACS central science·2024
Same author

A Smart Skin for Hydrogels That Enables Switchable Solute Release.

ACS applied materials & interfaces·2024

Area of Science:

  • Colloid and Surface Science
  • Physical Chemistry
  • Materials Science

Background:

  • Sodium oleate (NaOA) is an ionic surfactant known to form various self-assembled structures.
  • Understanding the influence of salts on surfactant self-assembly is crucial for controlling solution properties.
  • Cloud point behavior is typically observed in nonionic surfactants, not ionic ones.

Purpose of the Study:

  • To investigate the effect of different salts on the self-assembly and phase behavior of sodium oleate solutions.
  • To explore the mechanism behind the unique cloud point phenomenon observed with specific salts.
  • To compare the impact of binding salts versus simple salts on NaOA solutions.

Main Methods:

  • Preparation of sodium oleate solutions with varying salt concentrations.

Related Experiment Videos

  • Viscosity measurements to assess micelle formation.
  • Phase behavior studies, including heating and cooling cycles to observe cloud points and phase separation.
  • Analysis of the role of counterions in surfactant aggregation.

    • Main Results:

    • Both potassium chloride (KCl) and triethylammonium chloride (Et(3)NHCl) increased NaOA solution viscosity by promoting wormlike micelle formation.
    • Et(3)NHCl induced cloud points and liquid-liquid phase separation in NaOA solutions, a rare phenomenon for ionic surfactants.
    • KCl addition to NaOA/Et(3)NHCl solutions further lowered the cloud point temperature.
    • Tetraethylammonium halide salts did not induce cloud points or significant viscosity increases.

    Conclusions:

    • The binding salt Et(3)NHCl significantly alters the phase behavior of sodium oleate solutions, inducing cloud points.
    • Clouding is attributed to temperature-induced aggregation of anionic micelles stabilized by bound counterions.
    • The choice of counterion plays a critical role in the self-assembly and phase transitions of ionic surfactant systems.