Small-angle neutron scattering is used to investigate tetradecyl pyridinium bromide/pentanol/heptane/heavy water microemulsions in the water-in-oil (W/O) microemulsion phase diagram region. The heavy water content is increased while the other components (surfactant, cosurfactant, hydrocarbon) are kept constant. With use of a simple model assuming spherical micelles interacting with a hard-sphere potential (Percus-Yevick model), aggregate sizes and packing fractions have been extracted and found to agree with values determined from the mixing conditions. These experiments clearly show the transition from the single-particle (heavy water + Stern layer droplet) scattering regime at low water concentration to the mixed single/interdroplet scattering regime when the intermicellar distance becomes comparable to the size of the micelles. © 1990 American Chemical Society.
P. M. Lindemuth et al., "SANS From Tetradecylpyridinium Bromide Based Microemulsions," Journal of Physical Chemistry, vol. 94, no. 21, pp. 8247 - 8250, American Chemical Society, Jan 1990.
The definitive version is available at https://doi.org/10.1021/j100384a049
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01 Jan 1990