http://www.cnr.it/ontology/cnr/individuo/prodotto/ID21502
Dynamic Elasticity of Adsorption Layers in the Presence of Internal Reorientation Processes (Articolo in rivista)
- Type
- Label
- Dynamic Elasticity of Adsorption Layers in the Presence of Internal Reorientation Processes (Articolo in rivista) (literal)
- Anno
- 2001-01-01T00:00:00+01:00 (literal)
- Alternative label
Ravera F.(1), Ferrari M.(1),Miller R.(2),Liggieri L.(1) (2001)
Dynamic Elasticity of Adsorption Layers in the Presence of Internal Reorientation Processes
(literal)
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- Ravera F.(1), Ferrari M.(1),Miller R.(2),Liggieri L.(1) (literal)
- Pagina inizio
- Pagina fine
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- Pubblicato su J.Phys.Chem. I.F:3.611
Partially supported by the European Space Agency Topical Team Progress in Emulsion Science and Technology, by the ESA projects FAST and
FASES, and by the Italian Space Agency (contract ASI-CNR,
ARS 9915). (literal)
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- Dilational elasticity is an important property of adsorption
layers at liquid interfaces, one that is correlated to the dynamic
adsorption mechanism and has important consequences in many
technologically relevant phenomena, such as liquid film physics,
droplet or bubble coalescence, stability of foams, and emulsions.
Usually, surfactant systems are characterized from the point
of view of the surface adsorption isotherm and the dynamic
interfacial tension during the aging of the surface. However, to
understand the dynamic adsorption mechanisms in depth, it is
useful to study them also from the viewpoint of rheological
properties. In fact, an appropriate frequency study of the surface tension
response to controlled variations of the surface area can
put in evidence all the processes involved in the adsorption
dynamics. (literal)
- Note
- ISI Web of Science (WOS) (literal)
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- (1)Istituto di Chimica Fisica Applicata dei Materiali CNR, Via De Marini 6, 16149 Genova, Italy,
(2)Max Planck Institut fuer Kolloid und Grenzflaechenforschung, Max-Planck-Campus, Haus 2, Am Muehlenberg 2,
D-14476 Golm, Germany
(literal)
- Titolo
- Dynamic Elasticity of Adsorption Layers in the Presence of Internal Reorientation Processes (literal)
- Abstract
- It has been shown that reorganization processes in the adsorbed layer, such as the orientation of the adsorbed
molecules, can play an important role in determining the equilibrium and dynamic behavior of surfactant
systems. In fact, a model allowing for two possible adsorption states of the molecules, with different molar
surface areas, has been successfully applied to describe the equilibrium properties and the aging of liquid
interfaces. In this work, the problem of the rheological behavior of an adsorption layer in the presence of
reorientation processes is addressed, which represents a rather important need to increase the insight into the
properties of these surfactant systems and to support the experimental investigations. Thus, the main goal of
this paper is to calculate the frequency dependence of the dynamic dilational elasticity, _, within the framework
of the two-state model. According to the results, the phase of _ is no longer a monotonic function of the
frequency, as predicted by the classical Langmuir model, but suggests the presence of a local maximum.
Local extrema are found also in the modulus and phase of _ as a function of the equilibrium surface pressure.
This behavior is qualitatively in agreement with experimental observations available so far. The dynamic
elasticity of insoluble monolayers is also derived as a particular case of the general approach given here.
(literal)
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