Type of Document Dissertation Author Jomaa, Houssam W Author's Email Address email@example.com URN etd-08032005-194021 Title A Molecular Walk Across Polyelectrolyte Multilayers Degree Doctor of Philosophy Department Chemistry and Biochemistry, Department of Advisory Committee
Advisor Name Title Joseph B. Schlenoff Committee Chair Debra A. Fadool Committee Co-Chair Alan G. Marshall Committee Member Igor Alabugin Committee Member John G. Dorsey Committee Member Keywords
- Limited Source Diffusion Model
- Diffusion Through A Plate Model
- Kiessig Fringes
- Attenuated Total Reflectance
- Ion Exchange Resin
- Polymer Exchange
- Uvvis Spectroscopy
- Thin Films
- Neutron Reflectometry
- Ion Exchange
Date of Defense 2005-06-16 Availability unrestricted AbstractPolyelectrolyte multilayers are formed by alternate deposition of polyelectrolyte solutions of opposite charges onto a charged surface. The film produced can be very well controlled in terms of thickness and composition. The conditions of buildup, polyelectrolytes used, and post assembly treatment all contribute into giving these systems distinctive qualities and characteristics. Interfacial science, between the disciplines of biology and chemistry requires the use of materials that can be easily fabricated, controlled, and maintained. Multilayer thin films are currently under investigation for such applications that allow a perfect blend between chemistry and biology.
In this dissertation, the main focus is to illustrate the structural characteristics that affect or induce distinctive properties. Polymer chain rearrangements and movement are an essential factor in determining the dynamicity of these systems and how well they can be manipulated and adapted to various conditions. Factors affecting the dynamics of macromolecular exchange and rearrangement are an important aspect that allows understanding these systems and providing critical information regarding their applicability as biological agents for gene transfection, and potential drug delivery.
Another focus of this dissertation is to show how multilayer thin films can act as regenerative replacements to catalytically active surfaces. The process of polymer synthesis, multilayer buildup, and conditions of preparation are all factors that affect catalytic behavior of polyelectrolyte multilayers and modulate the response of the system to external stimuli, such as pH. The fact that multilayers can be easily put in reactors makes these systems of significant interest for industrial catalysis.
The process of ion exchange and self exchange is another industrially significant application that can be accomplished with polyelectrolyte multilayers. The ability to build multilayers on almost any support is an important aspect to many applications such as ion exchange chromatography and chemical purification. For instance, a process of multilayer buildup on ion exchangers has the effect of modulating the response of the resin particles due to the “reluctant” exchange properties of polyelectrolyte multilayers.
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