Archive for July, 2010

Taheri and colleagues publish in Applied Physics Letters

Posted in News on July 19th, 2010 by admin – Comments Off on Taheri and colleagues publish in Applied Physics Letters

Dr. Taheri’s latest paper, titled “In situ laser crystallization of amorphous silicon: Controlled nanosecond studies in the dynamic transmission electron microscope,” has been published in Applied Physics Letters.

Abstract: We describe an in situ method for studying the influence of deposited laser energy on microstructural evolution during nanosecond laser driven crystallization of amorphous Si. By monitoring microstructural evolution as a function of deposited energy in a dynamic transmission electron microscope (DTEM), information on grain size and defect concentration can be correlated directly with processing conditions. This work demonstrates that DTEM studies are a promising approach for obtaining fundamental information on nucleation and growth processes that have technological importance for the development of thin film transistors.

To access the paper, please visit: Applied Physics Letters

Taheri and Colleagues Awarded NSF Grant for Oxide Research

Posted in News on July 12th, 2010 by admin – Comments Off on Taheri and Colleagues Awarded NSF Grant for Oxide Research

Dr. Taheri (PI) and Assistant Professor Steven May (Co-PI) of the Department of Materials Science and Engineering (MSE) are the recipients of a new $290,268 three-year National Science Foundation (NSF) grant, “Multiscale Correlation of Magnetism and Microstructure at Iron/Oxide Interfaces.”

In this project, candidate oxide coatings for iron powder-based electromagnetic devices, prepared by molecular beam epitaxy, will be identified by investigating the magnetic and structural properties of oxide-Fe interfaces in the form of thin film heterostructures. The work funded by this grant is strategically targeted towards next generation materials and processing necessary for the future direction of electromagnetic devices, in particular applications for the automotive, wind, and aerospace sectors.

Taheri and Colleagues Awarded $349,486 DoE Instrumentation Grant

Posted in News on July 8th, 2010 by admin – Comments Off on Taheri and Colleagues Awarded $349,486 DoE Instrumentation Grant

Dr. Taheri and Co-PIs Michel Barsoum (MSE) and Chris Peters (ECE) have been awarded a $299,486 instrumentation grant from the Department of Energy as part of a new initiative to strengthen nuclear education at American universities. Drexel University will contribute $50,000 in matching funds to bring the total grant to $349,486. The Taheri group will receive $200,000 to facilitate the design of new in situ testing equipment for radiation damage studies.

As described in the grant proposal, “The unique capability of in situ high temperature straining in TEM allows for the understanding of reactor materials in many different conditions, ranging from those relevant to LWRs to candidates for future Gen IV reactors. The proposed additions to our research and education infrastructure will have a large impact not only on the understanding how current reactors behave, but also it will provide the foundation for developing new reactor materials, and training our future nuclear workforce. The PI is proud to have partnered with Westinghouse on sending students, through our world-renowned co-op program, to relevant industrial internships. The requested equipment provide a boost to this encouraging program.”

For more information, please visit the Department of Energy’s Nuclear Energy University Program website at: http://www.ne.doe.gov/newsroom/2010PRs/nePR070810.html

Taheri’s Paper on Ultrafast In Situ TEM Characterization to Appear in Applied Physics Letters

Posted in News on July 7th, 2010 by admin – Comments Off on Taheri’s Paper on Ultrafast In Situ TEM Characterization to Appear in Applied Physics Letters

Dr. Taheri’s paper, titled “In situ laser crystallization of amorphous silicon: Controlled nanosecond studies in the dynamic transmission electron microscope,” is scheduled for publication in an upcoming issue of Applied Physics Letters.

Abstract: We describe an in situ method for studying the influence of deposited laser energy on microstructural evolution during nanosecond laser driven crystallization of amorphous Si. By monitoring microstructural evolution as a function of deposited energy in a dynamic transmission electron microscope (DTEM), information on grain size and defect concentration can be correlated directly with processing conditions. This work demonstrates that DTEM studies are a promising approach for obtaining fundamental information on nucleation and growth processes that have technological importance for the development of thin film transistors.

Taheri and Colleagues Awarded $996,000 DoE Grant

Posted in News on July 7th, 2010 by admin – Comments Off on Taheri and Colleagues Awarded $996,000 DoE Grant

As part of a team lead by University of Michigan researchers, Dr. Taheri’s group has received an Nuclear Engineering University Program award from the Department of Energy, titled, “Fission Product Transport in TRISO Particle Layers under Operating and Off-Normal Conditions”.

The goal of this project is to determine the diffusivity and other behaviors of key fission products (Ag, Cs, I, Te, Eu and Sr) through PyC and SiC both thermally, under irradiation and under stress using fission products introduction techniques that avoid the pitfalls of past experiments. The total amount for the award is $996K with $200K being allocated to Drexel.

Brian Sparber Joins Group as Undergraduate Research Assistant

Posted in News on July 7th, 2010 by admin – Comments Off on Brian Sparber Joins Group as Undergraduate Research Assistant

Brian Sparber recently joined the group as an undergraduate research assistant. He will be studying diffusion in powder metal compacts.