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Title: Colloidal and surface properties of quartz
Author: Michael, H. L.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1978
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The electrical double layer around colloidal crystalline silica (Min-U-Sil) particles has been studied in NaCl and MgCl2 electrolyte solutions using the techniques of micro-electrophoresis and potentiometric titration. Two theoretical models (A and B) have been developed to predict the variation of the zeta potential of Min-U-Sil with electrolyte concentration and pH. Model A is based upon the assumption of an impenetrable particle surface while model B considers the surface to be permeable to ions from solution. Correlation of both models with zeta potential derived from experimental data suggests that a disturbed layer on the surface of the Min-U-Sil particles has a significant effect on the electrical double layer. Suspensions of Min-U-Sil in NaCl and MgCl2 electrolytes have been studied in sedimentation and in tangential shear flow as a function of pH, particle concentration, and electrolyte concentration. The suspensions were found to exhibit pseudoplastic flow behaviour in 10 1M electrolyte at low shear rate under certain pH conditions. The results have been interpreted in terms of the interaction energy for a two-particle interaction.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available