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oai:www.ideals.illinois.edu:2142/21510 2023-07-10 col_2142_5131 col_2142_11615 com_2142_5130 com_2142_9130 com_2142_8903

Zukoski, Charles F. Look, Jee-Loon 2011-05-07T13:10:41Z 2011-05-07T13:10:41Z 10000-01-01 1991 The mechanisms of formation of uniform particles from hydrolysis and condensation of titanium alkoxides are investigated. Evidence is presented suggesting two separate processes are determining the success of precipitating uniform particles: generating and maintaining a stable suspension throughout the reaction and a self sharpening growth mechanism to provide narrow size distribution. Factors that control particle morphology in the absence and presence of shear and the mechanisms of growth of colloidally stable suspensions are discussed. Two factors are identified which control colloidal stability and precipitate morphology during precipitation: interaction potentials of the precipitates and the nature of depositing species. A short range repulsive force is found to be required to explain the particles colloidal behavior. Under certain conditions, a solvation minimum develops in the pair potential which acts to localize particles at small separations. Under these conditions agglomeration occurs during the reaction. HCl and NaCl are added to the precipitating system to alter precipitate surface charges and solution ionic strengths, and the resulting morphologies are discussed. Comparison of experimental results and model predictions is made for the effect of HCl and NaCl on the particle morphology with thermal motion in the absence of shear and with shear in the absence of thermal motion. Made available in DSpace on 2011-05-07T13:10:41Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9136667.pdf: 9050568 bytes, checksum: ced0515c452b82e47ffc89b3fdd58146 (MD5) Previous issue date: 1991 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:51:17Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:23:31-05:00 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 AAI9136667 (UMI)AAI9136667 http://hdl.handle.net/2142/21510 eng Copyright 1991 Look, Jee-Loon Chemistry, Physical Engineering, Chemical Engineering, Materials Science Formation of uniform particles: Morphology and colloidal stability, and stable particle growth during precipitation from titanium alkoxides text Chemical and Biomolecular Engineering Engineering, Chemical Engineering, Materials Science Chemical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.