wizyta

od 2020-09-20

Title: Proton chemical exchange in aqueous solutions of dodecylammonium chloride: Effects of micellar aggregation

Source: Journal of Physical Chemistry C

Year : 2007

Abstract:

Proton chemical exchange was studied in aqueous solutions of dodecylammonium chloride (DDAC1) for two selected concentrations, 18 and 33 wt %. The Fourier transform Carr-Pureell-Meiboom-Gill (CPMG) NMR method combined with the Carver and Richards model for T-2 dispersion curve analysis were employed to evaluate the temperature dependence of the proton exchange rates k(ex). An increase of the energy barrier height Delta G double dagger for the proton chemical exchange between water and ammonium cation (-NH3+) was observed as the DDAC1 concentration was increased. Results are complementary to previous studies of aggregation phenomena for various n-alkylammonium chlorides.

DOI: 10.1021/jp073696s   (Pobrane:  2020-10-23)