{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/21510"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/21510","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Formation of uniform particles: Morphology and colloidal stability, and stable particle growth during precipitation from titanium alkoxides","abstract":"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.","abstract_html":"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.","abstract_has_math":false,"creators":["Look, Jee-Loon"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Chemical Engineering","degree_department":null,"school":null,"contributors":["Zukoski, Charles F."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:10:41Z","date_published":"2011-05-07T13:10:41Z","updated_at":"2026-07-22T22:25:18Z","subjects":["Chemistry, Physical","Engineering, Chemical","Engineering, Materials Science"],"languages":["eng"],"rights":["Copyright 1991 Look, Jee-Loon"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9136667","(UMI)AAI9136667"],"render_values":[{"text":"AAI9136667","href":null,"code":true},{"text":"(UMI)AAI9136667","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/21510","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Zukoski, Charles F."]},{"key":"dc:creator","label":"Author","values":["Look, Jee-Loon"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:10:41Z","10000-01-01","1991"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Chemistry, Physical","Engineering, Chemical","Engineering, Materials Science"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1991 Look, Jee-Loon"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9136667","(UMI)AAI9136667","http://hdl.handle.net/2142/21510"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["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"]},{"key":"dc:title","label":"Title","values":["Formation of uniform particles: Morphology and colloidal stability, and stable particle growth during precipitation from titanium alkoxides"]}]}],"canonical_facts":{"dc:contributor":["Zukoski, Charles F."],"dc:creator":["Look, Jee-Loon"],"dc:date":["2011-05-07T13:10:41Z","10000-01-01","1991"],"dc:description":["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). 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