Bulletin of the American Physical Society
2006 Ohio Section of the APS Fall Meeting
Friday–Saturday, October 13–14, 2006; Orrville, Ohio
Session D2: Nanostructures |
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Chair: Adil Wadia, The University of Akron Wayne College Room: Wayne College C109 |
Saturday, October 14, 2006 9:30AM - 9:42AM |
D2.00001: Glancing Angle Deposition of Cu on Si Dustin Kern, Lenu Zaman, Sean Gephart, Anura Goonewardene, Dongdong Jia Glancing angle deposition technique is a technique that putting the incident flux of source materials at a glancing angle to the substrate during deposition. The so-called shadowing effect can create various kinds of nano or micro structures on the substrate. For glancing angle deposition, the deposition can be thermal vapor deposition, pulsed laser deposition and magnetron deposition. In this work, copper was deposited on silicon substrate by using a magnetron sputtering technique at a glancing angle. The growth mechanism and morphology of the Cu film were analyzed by using a scanning electron microscope. [Preview Abstract] |
Saturday, October 14, 2006 9:42AM - 9:54AM |
D2.00002: Polyethylene films doped with nanophosphors for green house Justin Wilhelm, David Hunter, Tyler Laudenslager, Dongdong Jia CaAl$_{2}$O$_{4}$:Eu$^{2+}$ and CaSCl:Eu$^{2+}$ nanophosphors are prepared by using a salted sol-gel method and a stabilized precipitation method respectively. The absorption of the CaAl$_{2}$O$_{4}$:Eu$^{2+}$ nanophosphor is in the UV to deep blue (200-400nm) range. Its emission is at 450 nm. The absorption of the CaSCl:Eu$^{2+}$ nanophosphor is broad from deep UV to orange. Its emission is at 670 nm which is exactly where photosynthesis absorption peak at. We are going to embed these nanophosphors in transparent polymer materials for a greenhouse. Using the colloidal suspension properties of Xanthan Gum, isolated from \textit{Xanthomonas campestris }the desiccation resistance of the polymer will be utilized. Xanthan Gum observes low shear and high viscosity in aqueous solutions that will allow a thermal stabilization of a heavy metal phosphor-polymer colloid. The influence of pH on the system will be independent of the nucleation of the phosphor. By dispersing nanophosphors with Xanthan, transparent red and blue light enhance greenhouse film can be prepared. [Preview Abstract] |
Saturday, October 14, 2006 9:54AM - 10:06AM |
D2.00003: Nano Motor Construction Craig Shaffer, Shawn Pickering, Dongdong Jia, Anura U. Goonewardene Ten micron-sized polystyrene spheres were applied to a quartz substrate with a dodycal solution to make a monolayer of microspheres. The microspheres are found to self-assemble as a monolayer on the surface. A platinum thin layer was deposited onto the surface with a Hummer IV sputter coater and then placed into a diluted chloroform solution. The chloroform removed the microspheres from the surface, which gave a honeycomb structure on the surface of the quartz substrate. Using a liftoff process the honeycomb structure was lifted from the substrate. The honeycomb structure was then broken to get a single ring. The single ring was placed in a liquid solution with a low viscosity so that the ring will not encounter much resistance while moving. An alternating magnetic field generated by applying an AC current to two Helmholtz coils was applied to the ring to create an induced current inside the ring. A permanent magnetic field was applied in the perpendicular direction to the formal field to make the ring to rotate by generating a magnetic torque. To ensure the ring was spinning a laser beam was focusing on the ring, and a change in the reflected pattern. [Preview Abstract] |
Saturday, October 14, 2006 10:06AM - 10:18AM |
D2.00004: Observation of Electromagnetically Induced Transparency (EIT) in an Atomic Vapor using the Hanle Effect Yuhong Zhang, Sam Bish, Benjamin Agyare, Samir Bali This is a progress report on our ongoing investigation of Electromagnetically Induced Transparency using the Hanle effect in Rubidium (Rb) atomic vapor. The Hanle effect results in a sharp coherent feature in the absorption of the incident beam at zero magnetic field. We have observed this Hanle peak with good signal-to-noise ratio in the Rb$^{87} \quad F=1\;\to \;{F}'$ transitions. Hanle features in these particular transitions of Rb have never been previously observed. We describe further improvements made to our apparatus in order to further enhance the quality of the Hanle peak. Our goal is to use the Hanle effect as a sensitive measure of radiation trapping. We gratefully acknowledge funding from Research Corporation and the Petroleum Research Fund. We also thank Dr. Michael Crescimanno at Youngstown State University for loaning us an atomic clock magnetic shield. [Preview Abstract] |
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