Ph.D Nanoscale Science
Doctoral Presentation

Nathan Behm

Doctoral Advisor: Dr. Qiuming Wei

“The Influence of Reinforcement Size on the
Microstructure and Mechanical Behavior of a
Nanostructured Aluminum-Based Metal Matrix Composite”


With increased availability and growing commercial applications, aluminum-based metal matrix composites show promise as high specific strength structural materials. Before they can be implemented however, they require thorough characterization and testing. A novel nanostructured aluminum-based metal matrix composite (MMC) was characterized through a combination of microstructural analysis and mechanical testing. Two composites were studied, an aluminum MMC reinforced with 50 nm boron carbide, (B4C) and an aluminum MMC reinforced with 500 nm boron carbide. Transmission electron microscopy (TEM) analysis revealed an ultra-fine grained matrix with grains on the order of 100 – 300 nm. The quasi-static and dynamic response of the composites was compared with the behavior of...

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SPIE fellow


EVENT DATE: Tuesday, October 1, 2013
LUNCH WITH THE SPEAKER : 11:30am – 12:30pm * 238 Grigg
SEMINAR - 12:45 - 1:45pm * 132 Grigg


ci ling panTime-domain terahertz spectroscopy (THz-TDS) provides a non-contact method for characterizing the electrical and dielectric properties of technologically important materials, e.g., transparent and conducting Indium Tin Oxide (ITO) thin films, which are widely used in optoelectronic devices. Recently, ITO nanomaterials have attracted a lot of attention, because of its omidirectional and wideband anti-reflection characteristics. Indium-tin-oxide (ITO) nanorods (NRs) and nanowhiskers (NWhs) were fabricated by an electron-beam glancing-angle deposition (GLAD) system. Two terahertz (THz) time-domain spectrometers (TDS) with combined spectral coverage from 0.15 to 9.00 THz were used. These allow accurate determination of the optical and electrical properties of such ITO nanomaterials in the frequency range from 0.20 to 4.00 THz...

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Juan Vivero-Escoto Receives Ralph E. Powe Junior Faculty Award from ORAU

vivero1Chemistry Assistant Professor Juan Vivero-Escoto has received the 2013 Ralph E. Powe Junior Faculty Enhancement Award from Oak Ridge Associate Universities (ORAU), a 109-member university consortium affiliated with Oak Ridge National Laboratory (ORNL). Dr. Vivero-Escoto was among 30 winners in a pool of 147 applicants from the university consortium. Only two faculty members per institution were permitted to apply. Applicants underwent a highly competitive peer-review process organized by ORAU among its members. Dr. Vivero-Escoto’s research interests include the design and synthesis of novel hybrid inorganic-organic materials for biomedical applications. This...

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Nanoscale Science - Faculty in Focus

Welcome to the Walter Research Group in the Chemistry Department at UNC Charlotte. We are interested in the synthesis and development of new materials for Solar Energy Conversion. Photoactive materials such as porphyrins are developed in our lab can be used to harvest solar photons and convert that energy into either electricity or into a fuel such as hydrogen. Our work involves testing these materials in organic solar cell, dye-sensitized TiO2 solar cell, or photoelectrochemical cell configurations. Our work spans materials research, organic syntheses, and nanoscience.