Bulletin of the American Physical Society
Joint Spring 2013 Meeting of the Texas Sections of the APS and AAPT and Zone 13 of the SPS
Volume 58, Number 3
Thursday–Saturday, April 4–6, 2013; Stephenville, Texas
Session G3: Nanoscience and Solid State Physics |
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Chair: Mirley Balasubramanya, Texas A&M University-San Antonio Room: Science Building 112 |
Friday, April 5, 2013 3:24PM - 3:36PM |
G3.00001: Electron transmission through a graphite crystal Cristian Bahrim, Robert Nick Lanning The analysis of the diffraction pattern produced by electrons transmitted through crystals provides information about the length of the chemical bonds, the distance between the atomic layers, and the lattice constant of the crystal. Here we report experimental results for electron diffracted by a graphite crystal. From the Lorentzian profile of the central maximum of diffraction we calculate the characteristic time of interaction between the electron projectile and the Carbon atoms of graphite. The Carbon atom acts as a pinhole and Fourier transforms the incident electron beam into a broad diffraction pattern. This characteristic time is shorter than one femtosecond because of the Pauli Exclusion Principle which forbids the projectile electrons to inhabit the ground state atoms of graphite. Our apparatus can produce relativistic projectile electrons. Using a relativistic approach and the Heisenberg uncertainty principle, from the width of the central maximum of diffraction we extract the spreading, $\Delta \lambda $, of the de Broglie wavelength of the projectile electron inside the crystal. We also calculate the relativistic values of the spreading in the linear momentum and kinetic energy while the electron is passing through the crystal. [Preview Abstract] |
Friday, April 5, 2013 3:36PM - 3:48PM |
G3.00002: Extraordinary Properties of Carbon Nanotubes and their Use in Technology and Medicine Michael Duran, Michael Jacobs, Daniel Bullmore, Samina Masood Single and multi-walled carbon nanotubes (CNTs) have remarkable thermal and electromagnetic properties that suggest a wide range of application. Here, we discuss some of the various properties of the tubes and how they are related to the method used to synthesize them. We focus on the electromagnetic and chemical properties, and use them to show the viability of discrete CNT based components. After considering various advantages that CNTs have over microstructures, we make a proposition for the advancement and development of electronics using nanotechnology. As for current applications, we discuss the use and functionality of CNTs in the development of cancer treatment. Whether these nanostructures of carbon are being used for chemotherapeutic drug delivery or photodynamic therapy, we show that their extraordinary properties of can be used in advantageous ways by many different industries. We discuss some new applications of existing results. [Preview Abstract] |
Friday, April 5, 2013 3:48PM - 4:00PM |
G3.00003: A Study of Dielectric Relaxation Using Microwave Technology James Roberts, Jai Dahiya, Santeel Ghosh An insulating material placed in an electric field is polarized. A material such as this when placed between two parallel plates of a capacitor changes the capacitance of the capacitor in accordance with the polarization behavior of the material. Because of this material behavior, the insulating material is known as a dielectric and this process of interaction is referred to as dielectric relaxation. The dielectric relaxation of a number of materials has been investigated using microwave technology at a fixed frequency and varying the temperature. The data show some interesting results for select materials which are presented in this paper. [Preview Abstract] |
Friday, April 5, 2013 4:00PM - 4:12PM |
G3.00004: Improving Light-Emitting Electrochemical Cells with Ionic Additives Jason Slinker, Yulong Shen, Brad Holliday Light Emitting Electrochemical Cells (LEECs) from ionic transition metal complexes (iTMCs) may serve as a new lighting technology candidate. These simple, cost effective devices are solution processable and compatible with low-temperature assembly and reel-to-reel fabrication under ambient conditions. However, these devices have yet to achieve the stringent operational benchmarks required for lighting. We used the archetypal iridium iTMC as the emissive material in LEECs and blended in alkaline additives to control ionic space charge effects and substantially improve performance. For lithium additives, turn-on time improved drastically and the maximum luminance was increased to practical lighting levels without substantially affecting device lifetime. We have also studied other alkaline salts and justified their relative impact on device performance in view of double layer charging. These observations suggest that iTMCs from LEECs have the potential to serve as bright, long-lasting light sources. [Preview Abstract] |
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