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Title: Multiparticle colloidal interactions : a fundamental investigation
Author: Wilson, J.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2003
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The main objective of this work was to investigate the behaviour of both confined and unconfined multi-particle colloidal systems at low electrolytes concentrations for evidence of non-DVLO behaviour and to systematically quantify this behaviour. Photon correlation spectroscopy (PCS) was used to evaluate whether it was possible to detect and quantify the possible formation of small amounts of aggregates at low electrolyte concentrations in unconfined systems. PCS does not offer the resolution to accurately characterise such systems. Extra non-DVLO interaction forces for silica were incorporated into a previously developed dynamic ultrafiltration model by way of a power law description to more accurately predict filtration rates at low electrolyte concentrations (<0.03 M NaC1) where deviations from experimental filtration rates were observed. As the electrolyte concentration was decreased a long-range attraction was observed. The effect that membrane charge has on the inter-particle interactions and hence, rate of ultrafiltration, was also investigated. Identical ultrafiltration experiments with two membranes, one highly charged and one lowly charged, showed that the magnitude of membrane charge has no significant effect on inter-particle interactions near the membrane surface and hence, rate of ultrafiltration. Overall, the work in this study has shown non-DVLO type behaviour occurring in confined multi-particle systems at low electrolyte concentration, but not in unconfined systems.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available