ISSN:
1435-1536
Schlagwort(e):
Critical micelle concentration (CMC)
;
degree of micellar ionisation
;
alcohols, effect on CMC
;
micelles of alkyltrimethylammonium bromides
;
solubilization
;
distribution coefficients
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
,
Maschinenbau
Notizen:
Abstract The effect ofn-butanol,n-propanol, andn-hexanol on the critical micelle concentration (CMC) and degree of ionisation of the micelles of dodecyl-, tetradecyl- and hexadecyltrimethylammonium bromides in aqueous solution has been determined by conductimetric techniques. Increase of the molality of added alcohol over the concentration ranges examined (up to 0.3 mol kg−1 butanol, 0.07 mol kg−1 pentanol and 0.025 mol kg−1 hexanol) caused a progressive decrease of CMC and increase of the degree of ionisation for each surfactant-alcohol system. At a constant molality of added alcohol the degree of ionisation increased with a) an increase of the chain length of the surfactant for each alcohol and b) an increase of the chain length of the alcohol for each surfactant. The distribution of each alcohol between the aqueous and micellar phases and the free energy of solubilization were determined from the change of CMC with molality of added alcohol.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00653225
Permalink
