Kamneva N. The peculiarities of the protolytic equilibria on the surface of the cationic nanoparticles in hydrophilic and hydrophobic dispersions

The dissertation is devoted to the elucidation of the peculiarities of the protolytic equilibria in the Stern layer of the micelles of cationic surfactants of different types (one- and two-tailed, with addition of 1-butanol, etc.), in reversed micelles of these surfactants, as well as on the positively charged surface of the colloidal particles of nanodiamonds. The sulfonephthalein and xanthene indicators and solvatochromic dyes have been studied in these systems. The indices of the apparent ionization constants, , give evidence for the similar differentiating influence of all the systems based on the cationic surfactants. The protolytic equilibria in twelve reversed microemulsions based on four cationic surfactants, two co-surfactants (1-butanol and 1-octanol), and four low-polar solvents (n-hexane, cyclohexane, n-octane, and chloroform) have been studied using both HBr (or HCl) solutions and buffer mixtures in aqueous nanodroplets. After taking into account some impeding factors, the similarity of the values of the indicators in these systems and in the direct micelles of the same surfactants have been revealed. Key words: cationic surfactants, micelles, reversed microemulsions, acid-base indicators, spectrophotometry, potentiometry, apparent ionization constants, electrical surface potential, nanodiamond hydrosol, coagulation.