SPS Zone 5 Home Page: Student Abstracts II

Nanofabrication of Elastic Magnetic Structures
Daniel Glass (Elon University)

Magnetic microspheres are used in a wide variety of applications within the scientific community – they are useful, for example, in exerting localized forces and torques at the microscale, and for binding and transporting specific molecules in a controlled manner. There is therefore demand for a wide variety of magnetic microspheres of varying size and chemical functionality. Unfortunately, current manufacturing processes are not able to produce such microspheres within a key size range. We believe we might be able to fill this gap by producing microspheres of a novel material which is a complex of magnetic nanoparticles within a crosslinked polymer matrix, a ferroelastomer.

A Classical Force Exchange Simulation
Colin McGuire (High Point University)

A classical force exchange refers to two objects that exchange a massive particle at constant speed. When the particle is "thrown" or "caught" by each object, it exerts an impulse on the object. As a result of this exchange, the objects accelerate away from each other with an apparent repulsive force. A simulation of the system was developed using Easy Java Simulations (EJS) in order to determine the distance dependence of this force as well as its dependence on other system variables. In this poster, the repulsive force, potential energy, kinetic energy, and total energy of the system will be presented.

High-Speed Video Analysis of a Cantilever
Daniel Short (High Point University)

A cantilever is a beam that is fixed at one end and free to oscillate on the other end. It is used in an atomic force microscope and a computer hard drive, for example. In this experiment, a cantilever was set up using a long, flat metal beam, and its motion was captured at 1200 fps using high-speed video. The video was analyzed to determine how the frequency of oscillation depends on the length of the beam. In addition, the video was studied to determine the relative contribution of different modes of oscillation to the equation of motion of the beam. In this poster, the high-speed video, the differential equation and solution for the cantilever, and the results of the video analysis will be presented.

Electronic Response to Molecular and Structural Changes in Fluorinated Pentacene Transistors
Claire A. McLellan (Wake Forest), Daniel David (Wake Forest), Zachary Lamport (Wake Forest), Balaji Purushothaman (University of Kentucky), Eric Chapman (Wake Forest), John E. Anthony (University of Kentucky), and Oana D. Jurchescu (Wake Forest)

We report on the morphology and electrical properties of a variety of newly developed functionalized fluorinated pentacenes. The devices of interest are organic thin film transistors (OTFTs). We have fabricated the films by drop casting the organic semiconductor from a solution of chlorobenzene. We demonstrate that chemical structure, and differences in surface treatment and drying conditions greatly affect the formation of crystals, and device properties, allowing us to measure mobilities from 10-5 cm2/Vs up to 10-1 cm2/Vs. We will discuss the effect of trialkylsilyl substituents, as well as the number of Fluorine atoms on electronic properties of these materials.
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