Ascending air bubbles in protein solutions |
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Authors: | C Ybert J-M di Meglio |
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Institution: | (1) Institut Charles Sadron (Unité Propre de Recherche du CNRS (UPR022)) and Université Louis Pasteur, 6 rue Boussingault, 67083 Strasbourg Cedex, France, FR |
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Abstract: | We report measurements of the ascending velocity of air bubbles in protein (bovine serum albumin) solutions. We show that,
because of the protein molecules adsorbed on their surface, the terminal ascending velocity of bubbles is strongly reduced
compared to the terminal velocity in pure water: protein- covered bubbles behave hydrodynamically as solid spheres. From the
evolution of the ascending velocity with time, we can derive the amount of protein needed to immobilize the bubble interface
which is 0.5 mg m-2, i.e. only one fifth of the amount adsorbed at equilibrium in the range of used bulk concentrations.
Received: 6 March 1998 / Revised and accepted: 6 May 1998 |
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Keywords: | PACS 68 10 Et Interface elasticity viscosity and viscoelasticity - 83 50 Lh Interfacial and free surface flows slip - 82 70 y Disperse systems |
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