Studies on the stability of thin films in bubble-particle adhesion

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dc.contributor.authorHernandez, Jorge L. Yordanen
dc.contributor.committeechairYoon, Roe-Hoanen
dc.contributor.committeememberKarmis, Michaelen
dc.contributor.committeememberAdel, Gregory T.en
dc.contributor.committeememberLuttrell, Geralden
dc.contributor.committeememberCelik, M.S.en
dc.contributor.departmentMining and Minerals Engineeringen
dc.date.accessioned2015-07-10T20:00:23Zen
dc.date.available2015-07-10T20:00:23Zen
dc.date.issued1989en
dc.description.abstractThe critical rupture thicknesses (H<sub>C</sub>) of thin liquid films between air bubbles and solid surfaces have been measured using an optical interferometry technique. The results of the measurements show that H<sub>C</sub> increases with the increasing hydrophobicity of a solid and varies inversely with the work of adhesion (W<sub>A</sub>) of water on the solid. The relationship between H<sub>C</sub> and W<sub>A</sub> has, therefore, been used to estimate the values of H<sub>C</sub> for the systems in which direct measurement is not possible. Thermodynamic calculations have been carried out for the bubble-particle adhesion process using the DLVO theory modified to include interaction energies due to structural forces. The calculations required knowledge of the values of various parameters such as, H<sub>C</sub>, zeta potentials, and Hamaker constants for both bubbles and particles. The results of the calculations conducted on methylated silica and coal show that the thin film ruptures mainly due to the attractive structural force (i.e., hydrophobic interaction). For silica and mica immersed in dodecylamine hydrochloride solutions, the major driving force for film rupture is either the attractive electrostatic force or the hydrophobic interaction force, depending on the pH and the amine concentration.en
dc.description.degreePh. D.en
dc.format.extentxiv, 193 leavesen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/10919/54536en
dc.language.isoen_USen
dc.publisherVirginia Polytechnic Institute and State Universityen
dc.relation.isformatofOCLC# 20139630en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1989.H476en
dc.subject.lcshFlotationen
dc.subject.lcshSurface chemistryen
dc.subject.lcshBubblesen
dc.titleStudies on the stability of thin films in bubble-particle adhesionen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineMining and Minerals Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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