2023 Technical Division Student Poster Contest: FMD 2023 Technical Division Graduate Student Poster Contest
Program Organizers: TMS Administration
Monday 5:30 PM
March 20, 2023
Room: Exhibit Hall G
Location: SDCC
SPG-6: Electronic Transport Properties of Mn2Sb: Salil Paranjape1; Daniel Shoemaker1; 1University of Illinois Urbana Champaign
Magnetic materials with the tetragonal P4/nmm Cu2Sb structure have the potential to control in-plane antiferromagnetic ordering through electrical currents or optical pulses, making them interesting for spintronic applications. However, their high resistance can cause significant joule heating during electrical read/write operations. Mn2Sb has been studied as a potential alternative due to its low defect density, which may lead to low resistivity. Single crystals of Mn2Sb were synthesized and their structure was characterized, showing a low amount of defects. Four-point resistivity measurements revealed a resistivity of 12.8 μOhm.cm at low temperatures and a high RRR of 75. This is lower than the prototypical Cu2Sb-type antiferromagnetic spintronic candidate CuMnAs (1000 μOhm.cm and RRR=2) (Volný et al. Phys. Rev. Materials 4, 064403, 2020). Mn2Sb may therefore be a promising material for spintronic devices due to its low resistivity and lack of defects.
SPG-7: First-Principles Study of Vacancy Formation Energy in High-Entropy Alloys: Christopher Lafferty1; Chelsey Hargather1; 1New Mexico Institute of Mining and Technology
Diffusion is the main process of mass transfer within a material. Diffusion directly effects phase transformations, mechanical properties, and failure mechanisms. Experimentally, calculating diffusion coefficients in a high entropy alloy (HEA) is costly and time consuming, making the use of computational techniques based on first-principles a viable alternative. The goal of this work is to calculate vacancy formation energy (VFE), which refers to the amount of energy required to remove an atom from its location within the lattice structure of a material. In the present work, a method for finding the VFE in a high-entropy alloy is presented which considers effects from the varying local environment. Magneticeffects on the VFE are also studied in detail. To justify the methods of this work, VFE is calculated for a commonly studied ternary system, CoCrNi, then the same methods are applied to a quinary system, CoCrFeMnNi, and related back to diffusion properties.
SPG-8: Investigation of Functional Coatings for Improving Performance of Carbon Nanotube-based Supercapacitors: Julia Allen1; 1Georgia Institute of Technology
Recent research on supercapacitors has focused on the development of complex architectures, such as hybrid or asymmetrical electrodes, intended to increase the energy density of the resulting supercapacitors. In this work, functional coatings are grown on a vertically-aligned carbon nanotube forest (VACNT). The morphology and composition of the coatings are studied in detail using SEM, TEM, EDS, and XPS. Pseudo capacitive titania coatings are grown on the VACNTs forming a discontinuous, particle-like morphology. However, the addition of an alumina layer grown on the VACNTs prior to titania growth results in the formation of a continuous, shell-like coating on the VACNTs. The presence of this alumina and titania coating is observed to decrease the series resistance of the supercapacitor, measured with electrochemical impedance spectroscopy, and improve the performance of the device over 1000 cycles when compared to titania-coated VACNT electrodes. In situ TEM experiments provide additional insights into charge storage mechanisms.
SPG-9: Material-based Characterization of Carbon Nanotube Field Emission Cathodes: Arega Margousian1; 1Georgia Institute of Technology
Carbon Nanotube (CNT) cathodes offer an alternative option for the electron source in space electric propulsion devices. A material-based study of carbon nanotube field emission could greatly benefit the small satellite propulsion research field. The first goal is to study the performance of CNT field emission cathodes in a high vacuum environment by using common methods of CNT property characterization such as SEM imaging and Raman spectroscopy. These methods would provide quality and structure measurements of the CNTs at the nanoscale which would be mapped to the I-V curves obtained from the cathode in high vacuum tests. The main purpose is to understand how the field emission yield changes as a function of CNT defects. This is important in understanding the main factors affecting the field emission current density. The second goal is to obtain the near field and far field electron beam distribution profiles. This result would be useful in determining optimal system parameters for future propulsion system designs, such as spacing between cathode and the thruster. This study would significantly increase our understanding of the carbon nanotube field emission cathode material characteristics and their performance.
SPG-11: Optimized Design of Interlocking Metasurfaces: Nathan Brown1; Ben Young2; Ophelia Bolmin2; Brad Boyce2; Philip Noell2; 1Sandia National Laboratories; Clemson University; 2Sandia National Laboratories
Interlocking metasurfaces (ILMs) are a new class of mechanical metamaterials offering a robust, nonpermanent joining technology. ILMs are built as architected arrays of interlocking unit cells that deliver adhesive-like properties to otherwise non-adhesive surfaces. Strategic designing of these unit cells offers explicit control over the engagement and disengagement forces of the ILM. This work attempts to produce optimally robust ILMs through parametric- and evolutionary-based optimization of the unit cell designs. When computationally and experimentally tested, the resulting designs prove to be considerably stronger in tension and shear compared to intuitively derived designs. These results offer insight into how ILMs can be more strategically designed for improved performance. The presented design and optimization framework ensures ILMs can offer a robust joining technology in a host of applications ranging from lattice connection to dissimilar material joining. ---Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions...
SPG-12: Synthesis and Characterization of Fullerene-Antibody Conjugate Energetic Nanoparticles (FACE-NP) for Bladder Cancer Treatment: Carolina Colon1; 1Georgia Institute of Technology
Bladder cancer is the 6th most common cancer in the USA and the 4th most common amongst Veterans with over 80,000 new cases diagnosed annually. The most effective way to treat Bladder Cancer nowadays is via tumor ablation. However, this method misses many tumors in the microscopic scale. Fullerene-Antibody Conjugate Energetic Nanoparticles (FACE-NP) would be the first of its kind to allow for cancer-specific ablative therapy at the microscopic level without affecting neighboring healthy cells. FACE-NP works by targeting and binding only to the over expressed proteins in the tumor site. Once locked on, they are activated with a low-powered laser that triggers a localized tumor ablation at the microscopic level without affecting normal cells. In this study, the chemical structure and composition of FACE-NP were characterized via Fourier Transform Infrared (FTIR) and Thermogravimetric Analysis (TGA). Additionally, FACE-NP were also synthesized via reflux reaction to illustrate its reproducibility and manufacturing.