Studies on the Adsorption of Surfactants and Polymers to Surfaces and Their Effects on Colloidal Forces
| Autor: | Tulpar, Aysen |
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| Rok vydání: | 2004 |
| Předmět: | |
| Druh dokumentu: | Dissertation |
| Popis: | Surfactants, polymers, and their mixtures are widely used in commercial formulations of paints, water-based adhesives, detergents, food, and other products. This thesis describes measurements of the forces acting on colloidal particles in surfactant and polymer solutions. The change in force on addition of surfactants and polymers is usually caused by adsorption to an interface. In this thesis, I also describe the effect of surface charge density, surface crystallinity, surface heterogeneity, and preadsorbed polymer on surfactant adsorption. A new method for the stabilization of colloidal particles is introduced via the synthesis and adsorption of unnatural proteins. Unnatural proteins can be synthesized using the natural "machinery" of a bacterial cell with almost any primary sequence, and provide an environmentally friendly route to colloidal stabilization. As a model system, we study the stabilization of alumina, because alumina has a high Hamaker constant and is therefore difficult to stabilize. An unnatural protein with the sequence, thioredoxin-Pro39Glu10 is used. The Glu10 is anionic (pH > 3) and is designed to adsorb to positively charged alumina (pH Ph. D. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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