INVESTIGADORES
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congresos y reuniones científicas
Título:
Studies on the catanionic system sodium Undecenoate - Dodecyltrimethylammonium Bromide
Autor/es:
MARIA BELEN SIERRA ; MARCELA A. MORINI; PABLO SCHULZ
Lugar:
Fortaleza
Reunión:
Simposio; Surfactants in Solution Symposium; 2004
Institución organizadora:
UNESP
Resumen:
Following the studies on
the effect of double bonds in the
surfactant hydrophobic tail on the
formation of mixed surfactant
aggregates, we studied the viscosity
and density of the system Sodium
10-undecenoate (SUD)?decyltrimethylammonium
bromide (DTAB)?
water. We found that the partial
molar volume (pmv) and intrinsic
viscosity of both, micellised and
unmicellised mixtures, are non-ideal,
dependent on the mixture composition
and related to structural changes
in micelles. These phenomena
are caused by the presence of the double bond at the distal extreme of
the SUD molecule, which has some
affinity with water by formation of
hydrogen bonds. In particular, as far
as we know, this is the first report on
non-ideal behavior of the pmv in
mixed micelles.