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Structural evolution of a two-component organogel.

Mohit Singh1, Grace Tan, Vivek Agarwal

  • 1Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, Louisiana 70118, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 25, 2004
PubMed
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Adding p-chlorophenol to AOT reverse micelles in isooctane induces a microstructural transition. This leads to the formation of strandlike aggregates and eventually a 3D organogel network.

Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Aerosol-OT (AOT) forms reverse micelles in nonpolar solvents like isooctane.
  • Phenolic compounds can interact with surfactant aggregates, potentially altering their structure.

Purpose of the Study:

  • To investigate the microstructural evolution of AOT reverse micelles in isooctane upon addition of p-chlorophenol.
  • To identify the stages and mechanisms of transition from micellar solutions to organogels.

Main Methods:

  • Systematic addition of p-chlorophenol to AOT/isooctane solutions.
  • Characterization using light scattering, small-angle neutron scattering (SANS), NMR, and rheology.

Main Results:

Related Experiment Videos

  • A threshold concentration of p-chlorophenol was identified, below which no significant structural changes occur.
  • Beyond the threshold, strandlike aggregates form, progressively evolving into a three-dimensional gel network.
  • The study examined equilibrium stages between dry reverse micelles and a 1:1 AOT/p-chlorophenol organogel.

    • Conclusions:

    • Phenolic dopants like p-chlorophenol can induce a phase transition in AOT reverse micellar systems.
    • The transition proceeds through distinct stages, culminating in the formation of a supramolecular organogel.