Miller's project "CAREER: Magnetocaloric effect in metallic nanostructures" received $586,060 effective April 1, 2010.
TAMPA, Fla. -- Physicists from USF have discovered a potential new way to advance solid state refrigeration technology, making the evolving field of environmentally-friendly and energy-efficient alternative to conventional refrigeration more efficient.
Solid state refrigeration eschews conventional refrigerants and mechanics to produce cooler temperatures through thermoelectric technology, without the moving parts and chemical refrigerants now commonly used. But despite its anticipated advantages such technology is not competitive nowadays because of the low efficiency of the solid state refrigerants. Their findings were published in Physical Review Letters.
Assistant Professors Inna Ponomareva and Sergey Lisenkov in USF’s Department of Physics developed state-of-the-art computational experiments to simulate performance of ferroelectric materials as solid-state refrigerants. Such materials can convert electrical energy into thermal energy and vice verse – known as the electrocaloric effect.
The process works when an electric field is applied to material under certain conditions, causing the temperature to rise. The removal of the electric field will cause the temperature to drop. Thanks to the reversibility of such temperature changes they can be utilized in a refrigeration cycle, the faculty members said.
While the ability of ferroelectric materials to exhibit the electrocaloric effect was known for many decades their practical applications for solid state refrigeration was impossible due to minuscule value of the temperature change. In the recent years the interest to the electrocaloric properties of the ferroelectrics has increased enormously, thanks to the predictions of giant electrocaloric effect in ferroelectric nanostructures.
Using the novel computational tool and USF supercomputing resource, the researchers demonstrated a new way to enhance the electrocaloric efficiency. Their method is based on the discovery of coexistence of positive (temperature raise) and negative (temperature drop) electrocaloric effect in the same ferroelectric material. By designing a “special recipe" for a refrigeration cycle that can be created when the positive and negative effects alternate, the efficiency of refrigeration can be greatly enhanced, they reported.
Brian Demaske (Major Professor: Ivan I. Oleynik) has been awarded a prestigious National Defense Science and Engineering Graduate (NDSEG) Fellowship.
Ivan I. Oleynik has been selected for the honor of receiving a 2012 Faculty Outstanding Research Achievement Award.
Physics doctoral students invited to prestigious Nobel meeting
TAMPA, Fla. -- Three University of South Florida physics students have been invited to attend the 62nd Nobel Laureates Meeting in Lindau, Germany.
Physics graduate students Joseph Fogarty, Evan Lafalce and Aaron Landerville were selected for this prestigious and extremely competitive international honor. More than 20,000 young researchers apply to attend this meeting each year.
The meeting, which will be held in July, will be dedicated to physics this year and include more than 25 Nobel Laureates and 550 young researchers from around the world. The six-day meeting will provide an opportunity to exchange ideas, discuss projects and build international networks.
“It is a testament to the outstanding quality of Joe, Evan and Aaron, and their faculty mentors--Drs. Sagar Pandit, Xiaomei Jiang and Ivan Oleynik--that they have received this highly selective honor,” said Pritish Mukherjee, chairman of the Department of Physics at USF. “We are thrilled at their well-deserved success and the international recognition that they will bring to our university, the College of Arts and Sciences, the School of Natural Sciences and Mathematics, and to USF Physics.”
Fore more information about the Nobel Laureate meeting, visit its website.
Physics student receives 2010-2011 Outstanding Dissertation Award
Jason Lewis (Major Professor: Xiaomei Jiang) has been awarded 2010-2011 Outstanding Dissertation Award from the Graduate School.
Dr. Michael Conroy (Major Professor Ivan Oleynik) has been appointed as Research Physicist at US Naval Research Laboratory (NRL), in Washington, DC. This is a permanent staff position that Dr. Conroy received in less than TWO years of his stay at NRL and his graduation from USF. He graduated from the USF Physics department in 2009 and is an alumnus of the Materials Simulation Laboratory. He also received a prestigious Karles fellowship in conjunction with this appointment, which is named in honor of Nobel Laureate Jerome Karle, long time Chair of Science at NRL. This fellowship is awarded to new hires to full-time permanent research positions only, in recognition of his or her exceptional scientific abilities and research potential.
USF Physicists Discover Super-Elastic Shock Wave
Two USF Physicists awarded FY 2011 Defense University Research Instrumentation Program (DURIP) awards.
Matthias Batzill was awarded $206,650 for a photoelectron emission microscope. This instrument allows direct imaging of photo-emitted electrons from a surface with ~ 20nm resolution. Examples of applications include monitoring the growth of graphene and other two-dimensional nanomaterials.
Hariharan Srikanth was awarded $156,380 for a cryogenic probe station. This instrument will be custom-designed for a variety of transport measurements.
Stevce Stefanoski (Major Professor: George S. Nolas) has been awarded the prestigious German Academic Exchange award (DAAD, Deutscher Akademischer Austausch Dienst) for the fall 2011 in partial support of his practicum at the Max Planck Institute for the Chemical Physics of Solids in Dresden, Germany.
Adrian Popescu (Major Professor: Lilia M. Woods) has been awarded the Bright House Networks Endowed Fellowship for the fall 2011.
Shannon Hill (Major Professor: Martin Muschol) has been awarded the Bright House Networks Endowed Fellowship for the summer 2011.
FCASST Launched at USF
The Florida Cluster for Advanced Smart Sensor Technologies (FCASST) was initiated on December 9, 2010 at USF with a joint meeting of scientists and engineers from USF Physics and UF MSE. Proceedings of the Inaugural FCASST Meeting
M. Beekman, W. Schnelle, H. Borrmann, M. Baitinger, Yu. Grin and G.S. Nolas, ‘Intrinsic electrical and thermal properties from single
crystals of Na24Si136’, Phys. Rev. Lett. 104, 018301 (2010).
Michael W. Conroy (Major Professor: I. Oleynik) has been awarded 2009-2010 Outstanding Dissertation Award from the Graduate School.
Dr. Xiaomei Jiang, New Energy to Unveil World's First-of-Its-Kind See-Thru Glass SolarWindow Capable of Generating Electricity
University of South Florida Research Foundation Grants New Energy Exclusive, Worldwide License for Technologies to Enable Commercial Development of SolarWindow(TM)
Dr. Joshua Martin (Major Professor: G. Nolas) is featured as a postdoctoral scholar at the National Institute of Standards and Technology (NIST) Material Sciences and Engineering Laboratory.
Congratulations to Dr. Batzill and Dr. Oleynik for the publication in Nature Nanotechnology based on work done through a collaboration effort research groups in USF Physics. Also, congratulations to co-authors Jayeeta Lahiri (Ph. D. student), Pinar Bozkurt (undergraduate student) and You Lin (postdoc)!
Prof. George S. Nolas will be an invited speaker at the upcoming Wilhelm and Else Heraeus conference in Bad Honnef, Germany, on the topic Nanostructured Thermoelectric Materials.
Professors Hari Srikanth and Lilia Woods will be invited speakers in focus sessions on magnetic oxides and thermoelectrics, respectively, at the upcoming 2010 APS March Meeting in Portland, Oregon
M. Beekman, W. Schnelle, H. Borrmann, M. Baitinger, Yu. Grin and G.S. Nolas,‘Intrinsic electrical and thermal properties from single crystals of Na24Si136’, Phys. Rev. Lett. 104, 018301 (2010). 8/19/2010
Michael W. Conroy (Major Professor: I. Oleynik) has been awarded 2009-2010 Outstanding Dissertation Award from the Graduate School. 7/20/2010
Dr. Xiaomei Jiang
New Energy to Unveil World's First-of-Its-Kind See-Thru Glass SolarWindow Capable of Generating Electricity
University of South Florida Research Foundation Grants New Energy Exclusive, Worldwide License for Technologies to Enable Commercial Development of SolarWindow(TM) 7/20/2010
Dr. Joshua Martin (Major Professor: G. Nolas) is featured as a postdoctoral scholar at the National Institute of Standards and Technology (NIST) Material Sciences and Engineering Laboratory. 1/7/2010
Congratulations to Matthias and Ivan for the publication in Nature Nanotechnology based on work done through a collaboration effort research groups in USF Physics. Also, congratulations to co-authors Jayeeta Lahiri (Ph. D. student), Pinar Bozkurt (undergraduate student) and You Lin (postdoc)! 3/30/2010
Prof. George S. Nolas
will be an invited speaker at the upcoming Wilhelm and Else Heraeus conference in Bad Honnef, Germany, on the topic Nanostructured Thermoelectric Materials. 11/23/09
Professors Hari Srikanth and Lilia Woods
will be invited speakers in focus sessions on magnetic oxides and thermoelectrics, respectively, at the upcoming 2010 APS March Meeting in Portland, Oregon 11/16/09
Matthew Beekman (Major Professor: G. Nolas)
has been awarded 2008-2009 Outstanding Dissertation Award from the Graduate School. (11/9/2009)
Prof. Hari Srikanth
Co-organizing a symposium on functional oxide nanostructures and heterostructures at the 2010 Materials Research Society Spring Meeting to be held in San Francisco from April 5 – 9, 2010. Abstract deadline is November 2, 2009.
Applied Physics graduate student Nicholas Bingham from Prof. Srikanth’s Functional Materials Laboratory has been selected with full financial support by the IEEE Magnetics Society to attend the 2009 Summer School in Magnetics to be held from Sept. 20 – 25, 2009 at Nanjing University in Nanjing, China.(8/18/09)
M. Beekman, M. Baitinger, H. Borrmann, W. Schnelle, K. Meier, G.S. Nolas, and Y. Grin, “Preparation and Crystal Growth of Na24Si136”, J. Am. Chem. Soc. 131, 9642 (2009).
The synthesis and single crystal growth of clathrate-II Na24Si136 is performed in one step applying the spark plasma treatment to the precursor Na4Si4. The reported results demonstrate a new route to intermetallic compounds facilitated by the electric field and current. This technique is revealed to offer significant opportunities as a novel preparatory method for synthesis and crystal growth of new and novel materials.
Profs. Lilia Woods and George Nolas awarded three-year grant from National Science Foundation
Granular Nanocomposites for Improved Thermoelectric Performance: Theory and Experiment
Waste heat can be directly converted to electrical energy through use of various thermoelectric materials. A need persists to develop predictive models that can be utilized as design tools for development of nanostructured bulk thermoelectric materials, which can be formed quickly and, potentially, inexpensively.
Intellectual Merit: Two-component granular nanocomposites will be investigated from analytical as well as experimental perspectives. A microscopic model will take into account the electronic structure properties of the materials, as well as granular characteristics such as the interface barrier and size. Of particular importance will be the interplay between electronic structure changes due to doping of the individual components, and the scattering from the grain interfaces. The experimental research will involve synthesis and characterization of these materials. Measurements will serve as benchmarks for the proposed theory, and will also guide the research. The systems to be investigated are two-phase granular nanocomposites such as lead telluride/europium telluride, lead telluride/bismuth telluride, lead telluride/metal, and bismuth telluride/metal.
Broader Impact: Development of inexpensive, highly efficient thermoelectric materials is a key to realize large scale conversion of waste heat to high grade electrical energy. Other potential benefits include, for example, displacement of compression air conditioners in automobiles, possibly leading to substantial reductions in leakage and emissions of harmful refrigerants into the atmosphere.
Prof. Oleynik receives a new three-year grant form the Office of Naval Research
Atomic-scale mechanisms of hypervelocity chemistry and detonation
The main goal of the proposed research is to study atomic-scale mechanisms of detonation in energetic materials (EMs). The focus is to understand and predict complex processes arising from the interaction of a strong shock wave with an EM leading to the formation of a detonation front. Such processes include the initiation of the chemical reactions, mechanisms of chemical energy release, and the dynamics of a self-sustained detonation. In contrast to previous studies, the non-equilibrium stages of chemical initiation by the shock wave will be studied by developing and applying a novel “moving window” simulation technique. The unique feature of this method is in explicit inclusion of the shock wave front into the simulation cell, and the ability to investigate the non-equilibrium processes with fine time and space resolutions. Other methods to simulate the properties of detonating EMs such as equilibrium molecular dynamics (MD) with Hugoniot energy and stress constraints will also be used to investigate the properties of the energetic materials during their transformation from their unreacted initial state towards the fully reacted Chapman-Jouguet (CJ) state at the end of the reaction zone.
Michael W. Conroy, Doctoral Candidate in Applied Physics Program was awarded the NRC Post Doctoral Fellowship at the Naval Research Laboratory. (8/7/09)