Influence of surface rheology on particlebubble interaction in flotation

Document Type

Syllabus

Publication Date

1-1-2009

Abstract

The motion of bubbles and drops in a liquid is influenced by the kinetics of adsorption and desorption of surfactant molecules at the liquid surface. After a certain time the motion rate levels off and a steady state is reached in which the hydrodynamic field around the bubble, and in particular the motion of its surface, controls the steady state process. In contrast to the adsorption or desorption caused by a respective deviation from equilibrium between the adsorption layer and the subphase in a certain moment, the total amount of adsorbed substance does not change after the stationary state of buoyant bubbles has been established. Thus, rather than a time dependence of adsorption, a qualitatively different characteristic parameter determines the specific nature of adsorption kinetics caused by the hydrodynamic field of a buoyant bubble. Steadystate motion of bubbles induces adsorption-desorption exchange with the subsurface, with the amount of substance adsorbed on one part of the bubble surface being equal to the amount desorbed from the other part. Consequently, the surface concentration varies along the surface of a buoyant bubble taking a maximum value at the rear stagnation point and a minimum at the leading pole [1].

Identifier

84865039594 (Scopus)

ISBN

[9789004175860, 9789047429302]

Publication Title

Interfacial Rheology

First Page

567

Last Page

613

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