O. Senkel et al., Compression and expansion of surfactant adsorption layers at the liquid/air interface studied by a glass funnel method, COLL SURF A, 178(1-3), 2001, pp. 49-56
Citations number
31
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
In this work a funnel method as a technique for investigating dynamic surfa
ce properties at the liquid/air interface is used. The experimental set-up
consists of a hydrophilic glass funnel with the inclinations 45 and 30 degr
ees. A counter-body compensates the displaced liquid by moving in the oppos
ite direction to the funnel. The two advantages are the constant phase boun
dary level of the flat interface and the isotropic area change of the inter
facial layer. After moving the funnel into the subphase and subsequently up
again desorption/adsorption processes take place, each directed to re-esta
blished the equilibrium adsorption state. The relaxation process is monitor
ed by measuring the dynamic surface tension. Studies are performed with the
non-ionic model surfactant dodecyl dimethyl phosphine oxide. The data obta
ined are discussed in terms of the funnel material and the diffusion relaxa
tion theory. (C) 2001 Elsevier Science B.V. All rights reserved.