Aggregation behavior of quaternary salt based cationic surfactants was written by Mata, Jitendra;Varade, Dharmesh;Bahadur, Prashant. And the article was included in Thermochimica Acta in 2005.Quality Control of 1-Dodecylpyridin-1-ium bromide This article mentions the following:
The aggregation behavior of pure cationic surfactants (quaternary salts) in water was studied by elec. conductivity (at 293.15-333.15 K), surface tension, dye solubilization, and viscosity measurements (at 303.15 K). Critical micelle concentrations (CMCs), degree of counter ion dissociation (β), aggregation number and sphere-to-rod transition for cationic surfactants are reported. Using law of mass action model, the thermodn. parameters, viz. Gibbs energy (ΔG°m), enthalpy (ΔH°m), and entropy (ΔS°m) were evaluated. The plots of differential conductivity, (dk/dc)T,P, vs. the total surfactant concentration enables us to determine the CMC values more precisely than the conventional method. Surfactants with longer hydrocarbon chain are adapted to rodlike micelle better than to a spherical micelle. The data are explained in terms of mol. characteristics of surfactants viz. nonpolar chain length, polar head group size, and counter ion. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Quality Control of 1-Dodecylpyridin-1-ium bromide).
1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. One of the examples of pyridines is the well-known alkaloid lithoprimidine, which is an A3 adenosine receptor antagonist and N,N-dimethylaminopyridine (DMAP) analog, commonly used in organic synthesis.Quality Control of 1-Dodecylpyridin-1-ium bromide