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Memory effects across surfactant mesophases.

Donatella Capitani¹, Anand Yethiraj, E Elliott Burnell

¹Institute of Chemical Methodologies, CNR, Research Area of Rome, Via Salaria Km 29-300, Monterotondo Staz, Rome, Italy.

Langmuir : the ACS Journal of Surfaces and Colloids

|February 14, 2007

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Deuteron NMR reveals surprising memory effects in C(12)E(6)/water surfactant phases. These findings offer new insights into the structural properties of micellar, lamellar, cubic, and hexagonal mesophases.

Area of Science:

Physical Chemistry
Materials Science
Supramolecular Chemistry

Background:

Non-ionic surfactants like C(12)E(6)/water form complex mesophases.
Understanding these phase behaviors is crucial for various applications.
Shear and temperature significantly influence surfactant phase structures.

Purpose of the Study:

To analyze deuteron NMR spectra of C(12)E(6)/water mesophases.
To investigate the impact of shear (parallel and perpendicular) on phase transitions.
To explore temperature-driven phase sequences and memory effects.

Main Methods:

Deuteron Nuclear Magnetic Resonance (NMR) spectroscopy.
Preparation of samples with and without applied shear.
Analysis of micellar, lamellar, cubic, and hexagonal mesophases.

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Main Results:

Detailed NMR spectra were obtained for various C(12)E(6)/water mesophases.
A temperature-driven phase sequence involving multiple mesophases was observed.
Significant memory effects were detected across mesophase transitions, influenced by shear direction.

Conclusions:

Memory effects in surfactant mesophases provide structural insights.
Shear history impacts the observed phase behavior and transitions.
Deuteron NMR is a powerful tool for characterizing complex surfactant systems.