Assessment of Biodegradable Magnesium Alloys for Enhanced Mechanical and Biocompatible Properties

Abstract

DEDICATIONThis dissertation is dedicated to ever loving memory of my father. He would have been extremely proud of this moment. I dedicate this dissertation to my parents, brother and wife -without their energetic support and love, it would have been impossible to complete this research.iv ACKNOWLEDGMENTS

Preparation and Formula Analysis of Anti-Biofouling Titania–Polyurea Spray Coating with Nano/Micro-Structure

“…The surface morphology and chemical composition of TiO 2 -SPUA coating were characterized by scanning electron microscopy (Hitachi S-4700, California, CA, USA) [17] that was attached with a Bruker AXS Quantax 4010 energy dispersive X-ray spectrometer (EDX, Karlsruhe, Germany) [19]. OCA15 plus (Dataphysics, Filderstadt, Germany) was employed to measure the contact angles while using distilled water.…”

Electrochemical characterization and in-vitro bio-assessment of AZ31B and AZ91E alloys as biodegradable implant materials

“…Further, studies implicate that the anodization of magnesium can yield more favorable surface modifications when utilized accordingly. Such is the case in an orthopedic application study where surface porosity, attributed to an anodized surface, mimicked the cancellous microstructure of natural bone [20]. This study will focus on surface and electrochemical characterizations of anodized bio-absorbable alloys AZ31B and AZ91E.…”

“…Moreover, this porous anodic film is found to be dependent on the alloy composition, substrate microstructure, and other processing parameters such as temperature, concentration of electrolyte, current density, and applied anodization voltage [19]. Figure 1 [20] depicts an anodization set up, where the magnesium metal is the anode, and the cathode can be a variety of materials such as platinum or graphite. Further, studies implicate that the anodization of magnesium can yield more favorable surface modifications when utilized accordingly.…”

Biocompatibility Assessment of Biosorbable Polymer Coated Nitinol Alloys

“…The presence of proteins such as albumin and fibrinogen in the simulated body fluid will increase the in-vitro corrosion rates of implant materials [127]. There are mainly two different ways to determine corrosion rates.…”

“…Figure 3.10 depicts the Nyquist plot which shows complex plane Z″ vs. Z′ and the capacitive arc provides an estimate of corrosion resistance of the material, in terms of its relative diameter, which is directly proportional to the charge transfer resistance or polarization resistance (R p ). Thus, an increase in semicircle diameter corresponds to an increase in corrosion resistance [127]. magnitude (log Z) vs. log frequency (log f) and the phase angle vs. log frequency [104].…”