Browsing by Subject "Chemical Engineering and Materials Science"

Now showing 1 - 4 of 4
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    Correlation of Granular Impact with Asteroid Impact
    (2014-04-16) Zhao, Runchen
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    Ethanol dehydration to ethylene in a stratified autothermal millisecond reactor.
    (2011-04) Skinner, Michael James
    Abstract summary not available
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    Microwave Spectroscopy of Pyridine-CS2
    (2012-04-18) Iyer, Shyam
    Having previously found the structure of pyridine-CO2 in our lab, determining the structure of pyridine-CS2 was a problem of immediate interest. CO2 and CS2 have opposite quadrupole moments, making the structures of the two complexes different. While scanning for rotation transitions using Fourier-transform microwave spectroscopy, several unassigned J 3->4 transitions were found around the 4 GHz region, which indicated a significantly different preliminary structure than the predicted linear geometry. The appearance of the spectrum suggests that the complex may have a dipole moment along the b-inertial axis.
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    Multi-junction Solar Cells of Lead (II) Selenide Quantum Dots and Zinc Oxide Nanowires
    (2012-04-18) Deng, Donna
    Solar energy is a greener alternative to coal or natural gas derived energy, but the inherently low efficiencies of current commercial silicon solar cells prevent it from being a viable competitor in the energy industry. Using semiconductor nanocrystals, also known as quantum dots, can increase the efficiency of solar cells; the band gaps of these particles can be adjusted by changing the sizes of these particles, allowing them to be tuned to optimally absorb sunlight. Incorporating nanowires have also shown to increase efficiency in thin film solar cells, as the comb-like structure allows for more efficient collection of charge carriers. This project involves the fabrication and study of the efficiency of solar cells with a heterojunction zinc oxide (ZnO) nanowires and lead (II) selenide (PbSe) quantum dots. The goal of this project is to use layers of differently sized PbSe quantum dots to make multijunction solar cells, which could further increase efficiencies.