Esam. Al-sherbini et al., Effect of binary solvents on the critical micelles concentration by using1-methyl-4-[4 '-aminostyryl]pyridinium iodide, COLL SURF A, 194(1-3), 2001, pp. 133-142
Citations number
30
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
The influence of preferential solvation of 1-methyl-4-[4'-aminostyryl]pyrid
inium iodide (M-NH2) on critical micelles concentration (c.m.c) has been st
udied by using sodium dodecyl sulfate (SDS) in the binary aqueous mixtures
of protic and aprotic co-solvents including glycerol, ethylene glycol, dime
thyl sulfoxide (DMSO), and acetone. The results reveal that the c.m.c depen
ds on the polarity, in addition to the dielectric constant of the co-solven
ts. The lower the polarity as well the dielectric constant (epsilon), the m
ore effective the breaking of the micelles. Acetone which has a low polarit
y (Z), low dielectric constant (epsilon), and large hydrophobic surface is
shown to be the strongest denaturant for micelles. On the other hand DMSO,
which has relative hydrophobic effect with large (epsilon), in addition wit
h glycerol and ethylene glycol which has large (epsilon) and small hydropho
bic surface have the weakest effect. (C) 2001 Elsevier Science B.V. All rig
hts reserved.