Quantifying single oil-particle interactions in aqueous media

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Quantifying single oil-particle interactions in aqueous media

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dc.contributor.author Aston, David Eric, 1972- en_US
dc.date.accessioned 2009-10-07T00:31:53Z
dc.date.available 2009-10-07T00:31:53Z
dc.date.issued 2001 en_US
dc.identifier.other b46035369 en_US
dc.identifier.other 48158842 en_US
dc.identifier.other Thesis 50252 en_US
dc.identifier.uri http://hdl.handle.net/1773/9898
dc.description Thesis (Ph. D.)--University of Washington, 2001 en_US
dc.description.abstract Detailed knowledge about the single-pair interactions between a rigid micro-particle and a liquid drop or air bubble immersed in some fluid is one way to predict and/or design the ensemble behavior of mixed colloidal materials, emulsions and other hybrid dispersions, from a kind of first-principles approach. The invention of the atomic force microscope (AFM) has made it possible to accomplish the direct measurement of forces from the interaction of a colloidal particle with a solid object, bubble or droplet. However, there are several fundamental difficulties with a compliant sample that must be addressed before colloidal microscopy can be applied quantitatively to academic studies and practical applications. The purpose of this work is to develop a general method for approaching AFM investigations of highly deformable fluid interfaces and to demonstrate its usefulness in specific areas of interest.These studies are the first to quantify film drainage and rupture times of aqueous films with AFM between a rigid micro-particle (toner) and an oil drop under dynamic conditions similar to paper recycling. It is also shown that electrosteric stabilization of the oil/water interface due to adsorbing cationic polyelectrolytes may be reversed via lipophilic surfactant addition to the oil. Other investigations of more idealized systems show the necessity of detailed AFM experiments to determine unknown interaction parameters for hydrophobically-driven phenomena. The so-called electrolyte titration is developed to control the net attraction between a hydrophobized-silica sphere and plate, revealing a characteristic curve of probe snap-in distance with concentration that allows accurate fitting of multiple surface forces parameters. From this knowledge, a theoretical force analysis of a sphere deforming a curved fluid interface is developed and tested on an oil drop with a polystyrene sphere in water. Fluid interface (FI)-AFM is then adapted to reveal the complexities of the hydrodynamics in a spherically wrapping thin film and of the effects of changing interfacial tension with ionic surfactants. en_US
dc.format.extent v, 135 p. en_US
dc.language.iso en_US en_US
dc.rights.uri en_US
dc.subject.other Theses--Chemical engineering en_US
dc.title Quantifying single oil-particle interactions in aqueous media en_US
dc.type Thesis en_US

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