Water loading driven size, shape, and composition of cetyltrimethylammonium/hexanol/pentane reverse micelles

Area of Science:

• Colloid and Surface Chemistry
• Soft Matter Physics

Background:

• Cetyltrimethylammonium bromide (CTAB)/hexanol reverse micelles are versatile systems with tunable physical properties.
• Water content is a primary factor influencing the behavior of these micellar systems.

Purpose of the Study:

• To characterize CTAB/hexanol reverse micelles as a function of water loading using small-angle scattering.
• To establish equations for predicting and controlling the physical parameters of these surfactant systems.

Main Methods:

• Small-angle scattering with contrast variation was employed.
• Scattering data were analyzed using multiple approaches to determine physical specifications.

Main Results:

• The shape of the reverse micelles was found to be slightly ellipsoidal and subtly changes with water content.
• Increased water loading leads to a higher proportion of hexanol in the surfactant shell.
• Size, shape, and composition are tunable via water content, reflecting a balance of forces.

Conclusions:

• Water content is a critical parameter for tuning the physical characteristics of CTAB/hexanol reverse micelles.
• Understanding these tunable properties allows for precise manipulation of the surfactant system for various applications.