Faculty of Engineering and Natural Sciences
Exponent, Inc. Menlo Park, CA 94025, USA
The use of microorganisms to develop environmentally friendly and renewable ways of
energy production has been explored by researchers from a variety of disciplines. In this talk, an electrochemical study on utilization of bacteria to increase the current production of a galvanic cell is presented. The concept of the bacterial battery was established during author’s former research at University of Southern California. A galvanic cell was constructed by using Aluminum and Copper electrodes and a growth medium containing Shwanella oneidensis MR-1 bacterium. An initial evaluation of the system showed that power generated by the bacterial battery increased continuously for up to 100 days, whereas power values for the sterile control cell dropped after the first day. Electrochemical impedance spectroscopy (EIS) was utilized to monitor changes on the electrode surfaces due to bacterial attachment. The effect of MR-1 on the corrosion behavior of different metal electrodes (Al 2024, copper, brass, mild steel and zinc) was evaluated in a separate study. The results showed that MR-1 provided excellent corrosion protection for all materials, however differences in biofilm formation and bacteria-metal interactions were observed.
Biocompatibility and corrosion of implant materials is discussed in the second part of this
talk. Corrosion performance is a major design criterion when selecting implant materials because corrosion can adversely affect biocompatibility by causing toxic ion release into the body and/or by affecting the functionality of the device. Regulatory agencies (ISO, FDA, etc.) typically require manufacturers to demonstrate that their devices will not deteriorate during their expected in vivo service. Use of in vitro electrochemical test methods to predict the long-term behavior of implant materials in the body is discussed.
28th of July, Tuesday in L055 of FENS