Dynamic surface tensions (DSTs) of aqueous solutions of a
glucamide nonionic surfactant, di-(C6-Glu),
below its critical micelle concentration, have been measured by a
maximum bubble pressure method as
a function of temperature, from 10 to 50 °C. Du Nouy tensiometry
was used to determine the temperature
dependence of the equilibrium surface tension and surface excess, while
the self-diffusion coefficient for
monomeric di-(C6-Glu) was obtained by pulsed-field-gradient spin-echo
NMR (D = 2.7 × 10-10
m2 s-1 at
25 °C). With these measured values, the final stages of the DST
decays are shown to be consistent with
an activation−diffusion controlled adsorption mechanism, and an
apparent activation energy E
a of
about
80 kJ mol-1. This conclusion supports
the arguments of Liggieri et al. (J.Colloid Interface Sci.
1993, 156,
109).
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