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oai:www.ideals.illinois.edu:2142/20752 2023-07-10 col_2142_5131 col_2142_11615 com_2142_5130 com_2142_9130 com_2142_8903

Zukoski, Charles F. Voegtli, Leo Paul 2011-05-07T12:48:15Z 2011-05-07T12:48:15Z 10000-01-01 1989 The electrokinetic properties of polystyrene latexes are investigated and data reduction indicates that surface charge regulation occurs through the adsorption of ions from the suspending medium. An independent non-electrokinetic method of determining ionic adsorption is developed confirming these results. Changes in particle surface properties and interaction potentials with volume fraction are examined with a model that indicates surface properties change little with volume fraction at moderate surface potentials and when the average particle separation is not too small. Further tests of how surface properties change with suspension volume fraction and fluid phase ionic strength are carried out by developing a model of suspension thermodynamic properties based on pair interactions. The statistical mechanical technique correctly predicts suspension osmotic pressures and the order/disorder phase transition. The study of the thermodynamic properties of concentrated suspensions of polystyrene latex indicates that these properties can be accurately predicted using hard sphere perturbation theory if the particle surface chemistry is understood. As a large portion of the particle surface charge is determined by ion adsorption, charge regulation as volume fraction or fluid phase ionic strength are altered is expected to play a large role in determining suspension properties at elevated volume fractions. The success of the models developed in this thesis indicates that the most important variable is the change of particle charge with ionic strength. As a consequence of the weak dependence of charge upon volume fraction, the low volume fraction characterization of surface charge can be used in predicting the thermodynamic properties of concentrated suspensions. Made available in DSpace on 2011-05-07T12:48:15Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9011063.pdf: 11212698 bytes, checksum: cf63a1f8d983978d197855f42793de91 (MD5) Previous issue date: 1989 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:46:01Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:20:31-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9011063 (UMI)AAI9011063 http://hdl.handle.net/2142/20752 eng Copyright 1989 Voegtli, Leo Paul Engineering, Chemical Electrostatic, electrokinetic, and ordering properties of concentrated suspensions of polystyrene latex text Chemical and Biomolecular Engineering Chemical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.