CINECA IRIS Institutional Research Information System
IRIS è la soluzione IT che facilita la raccolta e la gestione dei dati relativi alle attività e ai prodotti della ricerca. Fornisce a ricercatori, amministratori e valutatori gli strumenti per monitorare i risultati della ricerca, aumentarne la visibilità e allocare in modo efficace le risorse disponibili.
EnglishThe heats of diln. and osmotic coeffs. of N-dodecyl-N-benzylmorpholinium chloride (DBeMC), N-dodecyl-N-methylmorpholinium chloride (DMeMC) and dodecyltrimethylammonium chloride (DTAC) were measured by using a LKB flow microcalorimeter and a vapor pressure osmometer at 40°. The relative apparent and partial molar enthalpies, free energies, and entropies were derived as a function of surfactant concn. The pseudo-phase sepn. model was used to obtain graphically the crit. micelle concn. (c.m.c.) and enthalpy of micellization. Micellization heat capacities were also evaluated. The studies confirm that the benzyl group of DBeMC behaves as a second chain with respect to the micellization process. It was also possible to est. its length as similar to that of an alkyl chain of 5 carbon atoms. The packing parameter of DBeMC indicates the formation of non-spherical aggregates by this surfactant.
Thermochemical study of aqueous micellar solutions of some amphiphilic quaternary ammonium chlorides at 313 K / B. Rozycka-Roszak; E. Fisicaro. - In: THERMOCHIMICA ACTA. - ISSN 0040-6031. - 205(1992), pp. 19-31. [10.1016/0040-6031(92)]
| Tipologia ministeriale: | Articolo su rivista | |
| Appare nelle tipologie: | 1.1 Articolo su rivista |
File in questo prodotto:
http://hdl.handle.net/11381/2425219
Copyright © 2021