The behaviour of neutral, linear polymers in colloidal systems was studied. / The rate and reversibility of polymer adsorption were determined from changes in the hydrodynamic radius of the substrate latex by photon correlation spectroscopy (PCS). / Flocculation of latex was studied with respect to polymer and electrolyte concentration using stopped-flow turbidimetry and PCS. The observed optimal surface concentration and capture efficiency were compared with theoretical estimates. Self-reversing flocculation was seen in some cases involving non-equilibrium adsorption. / The forces between pairs of sterically stabilized spheres colliding in shear flow were determined from analysis of the particle trajectories. Impingement of the polymer layers was not extensive. A simple model demonstrated that drag due to fluid drainage through the adsorbed layers may contribute significantly to steric interactions in flow. / Particle deposition measurements indicated that adsorption of polymer onto glass from stagnation point flow is lower than diffusion controlled adsorption at the plateau value.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.70224 |
| Date | January 1991 |
| Creators | De Witt, James A. |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Doctor of Philosophy (Department of Chemistry.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001254841, proquestno: AAINN72132, Theses scanned by UMI/ProQuest. |
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