Event
MSE Seminar Series: Robert Shull, NIST
Friday, April 7, 2017
1:00 p.m.-2:00 p.m.
2110 Chemical & Nuclear Engineering Building
JoAnne Kagle
301-405-5240
jkagle@umd.edu
The Magnetocaloric Effect
Abstract:
One of the largest uses of energy in the world is the heating and cooling of spaces. Unfortunately, the existing technology based on the expansion and compression of a gas is only partially efficient, and utilizes environmentally harmful materials. As a consequence, the scientific community has been looking for an alternative technology. One such option is magnetic refrigeration wherein a material is subjected to a magnetic field (H) which cycles between zero and H0. Because it employs a reversible cycle, it has potential Carnot efficiencies. The technology is based on the magnetocaloric effect of a material, the topic of this presentation. Here the basis for this effect will be described along with how it’s magnitude varies with the type of material being considered, including in nanocomposites. Also to be discussed will be how the effect is measured, how it varies with temperature, and the proper way of using it to compare different materials.
Bio:
Dr. Robert D. Shull is presently one of 35 Fellows at the National Institute of Standards and Technology (NIST). He received a B.S. degree in Metallurgy and Materials Science from MIT in 1968, and both M.S. and Ph.D. degrees in Metallurgical Engineering from the University of Illinois at UrbanaChampaign in 1973 and 1976 respectively. After serving a Postdoctoral Fellowship at CALTECH from 1976-1979, he joined the National Bureau of Standards (NBS), now known as NIST. Since joining NIST, he pioneered the area of nanocomposite magnetic refrigerants, rapidly solidified the AlMn alloy in which the first "quasicrystals" were discovered, prepared the first laser-ablated High Tc superconductor, and first proved exchange-biased bilayers reverse their magnetic state asymmetrically. Dr. Shull has coauthored over 200 publications, edited 12 books and special journal issues, holds 4 patents, and presented over 380 talks (310 invited) at professional meetings. One of these papers appeared on the cover of Science magazine[Jan. 8, 1988] and another [Phys. Rev. B36, No. 7 (1987) 4036] received an award for the "Best Paper of the Year" at JHU-APL. Dr. Shull is a Past Chairman of the International Committee on Nanostructured Materials, a charter member of the Nanoscale Science, Engineering and Technology (NSET) Subcommittee of the NSTC, and was the President of TMS (TheMinerals, Metals, and Materials Society) in 2007. He is a Fellow of IEEE, a Fellow of TMS, one of 50 Honorary Members of the Indian Institute of Metals, and the 2009 recipient of the SPIE Nanoengineering Pioneer Award.
