Formation of uniform particles: Morphology and colloidal stability, and stable particle growth during precipitation from titanium alkoxides

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Chemical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Look, Jee-Loon

Contributors dc:contributor

• Zukoski, Charles F.

• Chemistry, Physical
• Engineering, Chemical
• Engineering, Materials Science

Statement dc:rights

• Copyright 1991 Look, Jee-Loon

Language dc:language

eng

Identifier

AAI9136667
(UMI)AAI9136667

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/21510