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Electrokinetic Characterization of Polymer Functionalized Colloids
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Electrokinetic Characterization of Polymer Functionalized Colloids
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Dissertation
Electrokinetic Characterization of Polymer Functionalized Colloids
2024
Overview
Characterizing the polymer brush height on microscopic surfaces has always been challenging. In this experimental study, two types of aqueous polystyrene colloid were synthesized: one bearing strong acid surface groups (sulfate), the other presenting weak acid moieties (carboxyl). Both kinds are referred to as bare particles. An emulsifier-free polymerization method and seeded growth polymerization strategy were investigated in an attempt to make monodisperse particles ranging in size from 100 to 2,000 nm diameter. The resulting latex was cleaned systematically to remove reaction by-products and off-size particles. Some of the particle batches were further processed to produce surfaces with terminally-anchored polyethylene oxide (PEO) brushes of various thicknesses by adjusting the polymer molecular weight. These samples are referred to as fuzzy particles. Electrophoretic mobility measurements were then conducted as a function of the suspending media ionic strength. Another set of samples was prepared by covalently linking single-stranded DNA molecules to the functionalized ends of the PEO strands via click chemistry. This technique produced corona-charged particles, which were also studied with the electrophoretic mobility measuring instrument. Finally, all particle mobility measurements were analyzed using a state-of-the-art software package based on the standard electrokinetic model. This study ultimately characterized the neutral (PEO) and corona-charged PEO-DNA brush height and distribution on the surface of colloidal particles. Complementary dynamic light scattering results and conductometric titration measurements are also discussed and compared with the electrophoretic mobility results.
Publisher
ProQuest Dissertations & Theses
Subject
ISBN
9798382728872
