chapter 10: CONCLUSIONS AND Future work
10.1 Considerations
Miniaturization of the electronic devices used in space, military and consumer applications requires cooling devices to be fabricated on a chip, for power efficient, noise-free operations. Refrigeration based on the adiabatic-demagnetization has been used for several decades for cooling to sub-kelvin temperatures. Superparamagnetic particles also hold tremendous potential for possible use in these applications. We have studied magnetocaloric effect (MCE) properties in chemically synthesized ferrite nanoparticles over a broad range in temperature and magnetic fields. Nanoparticles investigated include MnZnFe2O4 (average size = 15 nm, synthesized using reverse
micelle technique) and 2 samples of CoFe2O4 (average size 8 nm and 5 nm, synthesized
using pyrolectic technique). The magnetic entropy change was calculated by applying Maxwell’s relations to magnetization vs magnetic field curves at various temperatures. We have analyzed the ZFC-FC curves of these samples and have and are continuing to investigate the relationships between the blocking temperature, the irreversibility temperature, and the peak in the entropy change curves. Research in the area could help in tailoring nanoparticle systems for specific temperatures of operation.
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ABOUT THE AUTHOR
James Gass is a Florida native who moved to Tampa to attend the University of South Florida in 1997. James would go on to earn an undergraduate degree in Physics and a Master's degree under the guidance of Dr. Myung Kim,Ph.D., also in physics, and was awarded a patent (U.S. 6809845) during this time. James briefly taught high school physics and returned to the University of South Florida for further graduate study under the advisement and support of Dr. Hariharan Srikanth,Ph.D., in the Functional Materials Lab.
In the Functional Materials Lab James studied the magnetocaloric effect in novel nanoparticle systems. James completed his industry practicum at Material Modification, Inc. in Fairfax, Virginia. James has been a recipient of the Tharp Fellowship and Florida Academic Scholarship.
James has a strong interest in science education and outreach. James is a past participant in the USF Engineering Expo and regularly participates in school based events such as science fairs and the Great American Teach-In.