Effects of surfactant adsorption and surface forces on thinning and rupture of foam liquid films |
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| Institution: | 1. Department of Physical Chemistry, University of Sofia, 1 James Bourchier Blvd., BG-1126 Sofia, Bulgaria;2. Discipline of Chemical Engineering, School of Engineering, The University of Newcastle, New South Wales 2308, Australia;1. Department of Chemical Engineering, National Taiwan University of Science and Technology, 43, Keelung Rd., Sec. 4, Taipei 106, Taiwan;2. Department of Chemical and Materials Engineering, National Central University, Chung-Li 320, Taiwan;1. McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, TX 78712, USA;2. Department of Physics, University of Texas at Austin, Austin, TX 78712, USA |
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| Abstract: | The properties of thin liquid films (TLF) are of paramount significance for colloidal disperse systems, and a number of industrial processes, including froth flotation. In flotation, the bubble–particle attachment is controlled by the thinning and rupture of the intervening liquid film between an air bubble and a mineral particle. The froth evolution and its transient stability are also a function of the drainage and rupture of liquid films between air bubbles. Surface-active substances (surfactants) are used as flotation reagents to control the behavior of the liquid films. This paper presents a review of our research in the area of surfactant adsorption, surface forces and liquid films. It mainly focuses on the validation, application and extension of the Stefan–Reynolds theory on the liquid drainage. The extension of the Stefan–Reynolds theory comprises surface forces (disjoining pressure), surface tension variation, caused by the adsorption and diffusion of surfactants. Both the experimental and theoretical results are mostly related to the free (foam) films formed between two bubbles but can be principally extended to emulsion films between two oil drops and wetting films between an air bubble and a solid surface. |
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