A recently developed method was employed to study the deposition of colloidal particles under well-controlled hydrodynamic conditions. With this technique we studied the effects of polymers on the impingement of colloidal particles onto flat surfaces. In the deposition-detachment studies of bare latex particles, anomalous deposition rates and surface motions were observed. These types of behavior can be qualitatively explained by surface protrusions on the latex surface. Bare particles were dislodged from the surface by hydrodynamic forces exerted on them and by surface collisions between freely suspended and deposited particles. By coating the particles with neutral polymer, we found a decrease in the deposition rate but an increase in adhesion. The presence of free polymer in the jet increases the probability of escape. The detachment rate can be explained by an exchange between polymer segments bridging the particles to the surface and those freely dissolved in the jet. The presence of cationic polyelectrolyte promotes deposition and prevents the release of the particles.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.75675 |
| Date | January 1987 |
| Creators | Varennes, Suzanne |
| 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: 000665212, proquestno: AAINL45945, Theses scanned by UMI/ProQuest. |
Page generated in 0.0021 seconds