Colloid Deposition and Aggregation in the Presence of Charged Collectors

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deposition, ion release, polystyrene, aggregation, straining, Colloidal particles, glass beads, collector, column experiment, batch experiment, mixing

Supervisor and department: Rajendran, Arvind Chemical Engineering Fleck, Brian Mechanical Engineering

Examining committee member and department: Zeng, Hongbo Chemical Engineering

Department: Department of Mechanical Engineering

Specialization:

Date accepted: 2015-01-29T10:40:21Z

Degree: Master of Science

Degree level: Master's

Abstract: Colloidal-collector interactions are of fundamental importance in separation and filtration technologies. Here, the effect of collector grains on the behavior of colloidal particles was studied in two different experimental systems, i.e., column studies with stationary collectors and batch mixing to study hetero aggregation. Polystyrene latex beads, 100 nm diameter, and soda lime glass beads, with two different diameters of 212-300 $\mu$m and 710-1180 $\mu$m, were employed as colloidal particles and collector grains, respectively. Column experiments were performed to understand fate of colloidal particles in the porous medium. There are three major phenomena that control colloidal transport in porous media: Deposition, aggregation, and straining. These three distinct types of particle dynamics in porous media were studied by adjusting physicochemical properties of colloidal suspension. Furthermore, the effect of washing the collector beads was studied. Batch experiments, in which known amount of collector grains are added to colloidal suspension with known concentration, are designed to investigate more collector-colloids interaction role in transport dynamics of colloidal particles. UV-Vis spectroscopy and dynamic light scattering techniques are employed to understand both deposition and aggregation of colloidal particles in the vicinity of collector grains. Results obtained by dynamic light scattering revealed that aggregation is the predominant factor in this colloidal system. The possible sources for this type of behavior are also tackled by undertaking controlled experiments. In the batch experiments, ions leaching from the surface of glass beads, effect of mixing, and glass beads presence are confirmed as the three major reasons behind the aggregation of colloidal particles.

Language: English

DOI: doi:10.7939-R3HQ3S660

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Fuente: https://era.library.ualberta.ca/

Introducción

Colloid Deposition and Aggregation in the Presence of Charged Collectors by Behnam Sadri A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science Department of Mechanical Engineering University of Alberta © Behnam Sadri, 2015 Abstract Colloidal-collector interactions are of fundamental importance in separation and filtration technologies.
Here, the effect of collector grains on the behavior of colloidal particles was studied in two different experimental systems, i.e., column studies with stationary collectors and batch mixing to study hetero aggregation.
Polystyrene latex beads, 100 nm diameter, and soda lime glass beads, with two different diameters of 212-300 µm and 710-1180 µm, were employed as colloidal particles and collector grains, respectively.
Column experiments were performed to understand fate of colloidal particles in the porous medium.
There are three major phenomena that control colloidal transport in porous media: Deposition, aggregation, and straining.
These three distinct types of particle dynamics in porous media were studied by adjusting physicochemical properties of colloidal suspension.
Furthermore, the effect of washing the collector beads was studied.
Batch experiments, in which known amount of collector grains are added to colloidal suspension with known concentration, are designed to investigate more collector-colloids interaction role in transport dynamics of colloidal particles.
UV-Vis spectroscopy and dynamic light scattering techniques are employed to understand both deposition and aggregation of colloidal particles in the vicinity of collector grains.
Results obtained by dynamic light scattering revealed that aggregation is the predominant factor in this colloidal system.
The possible sources for this type of behavior are also tackled by undertaking controlled experiments.
In the batch experiments, ions leaching from the surface of glass beads, effect of mixing, and glass beads presence ...