Degree of counterion binding of alkylpyridinium halide micelles: its relation to micelle shape and size was written by Fujio, Katsuhiko;Maruyama, Yasuhide;Uzu, Yuhei. And the article was included in Journal of Oleo Science in 2005.Electric Literature of C17H30BrN This article mentions the following:
From electromotive force measurements with surfactant and halide ion-selective electrodes, the authors obtained the degree of counterion binding (β) of dodecylpyridinium bromide (DPB) and iodide (DPI) and tetradecylpyridinium bromide (TPB) micelles in aqueous Na halide solutions with concentrations of 0-20 mM. Under a geometrical consideration the micelle shapes and the surface densities of head group (s-1) of these micelles were deduced from aggregation numbers evaluated from their relations to the added salt concentration previously reported. The spherical micelles of TPB having the shape of an oblate ellipsoid had a constant β, 0.76, independently of s-1. In the case of the spherical micelles of DPB, β is 0.79 for sphere-shaped micelles and 0.82 for ellipsoidal ones. For DPI the authors obtained β values of 0.84 and 0.99 for the spherical micelles with the shape of an oblate ellipsoid and the rodlike micelles, resp. From these dependences of β on micelle shape and s-1, β of micelles studied increases in the order of sphere-shaped < oblately ellipsoidal < rodlike micelles but is independent of the micelle size unless the micelle shape changes. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Electric Literature of C17H30BrN).
1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. The lone pair is in an sp2 orbital, projecting outward from the ring in the same plane as the σ bonds. Pyridine derivatives are also useful as small-molecule α-helix mimetics that inhibit protein-protein interactions, as well as functionally selective GABA ligands.Electric Literature of C17H30BrN