Na. Mishchuk et al., Hydrodynamic processes in dynamic bubble pressure experiments Part 5. The adsorption at the surface of a growing bubble, COLL SURF A, 192(1-3), 2001, pp. 157-175
Citations number
15
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
The dynamics of the adsorption process at the surface of a growing bubble i
s described for a diffusion-controlled adsorption mechanism. The model is l
inked with the measuring procedure in maximum bubble pressure experiments a
s it is programmed in standard tensiometers. As a result the pressure-gas f
low rate dependence is obtained which is the basis of the Lauda tensiometer
MPT2. The theoretical results allow to define the necessary corrections fo
r calculation procedures used in bubble pressure tensiometry, and to estima
te possible experimental errors. Moreover, the importance of particular fea
tures of commercial instruments is demonstrated, such as the requirement of
a large gas reservoir and a maximum length for capillaries needed to reach
short adsorption times of microseconds and below. The influence of the sur
factant concentration as studied for decyl dimethyl phosphine oxide on the
particular shape of all characteristic dependencies is quantitatively repro
duced by the theory. (C) 2001 Elsevier Science B.V. All rights reserved.