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SAMPE 2023 Conference and Exhibition

作者： Arigbabowo, Oluwasola K. Tate, Jitendra Geerts, Wilhelmus J. Texas State University Materials Science Engineering and Commercialization Program 601 University Drive San MarcosTX78666 United States Ingram School of Engineering Texas State University 601 University Drive San MarcosTX78666 United States Department of Physics Texas State University 601 University Drive San MarcosTX78666 United States

ISBN: (纸本)9781934551431

Magnetic polymer-based composites combine the cost-effectiveness, low density, and manufacturing flexibility of conventional polymers with the unique characteristics of magnetic powders/fillers to form multifunctional magneto polymeric composites that offer superior properties to conventional materials. At higher temperatures, magnetic properties change significantly and the particles within the magnetic powders experience sporadic motion due to the heat which causes misalignment of the magnetic domains, leading to a decrease in magnetism. Due to these adverse temperature effects, high-performance polymers such as polyetheretherketone (PEEK), polyetherimide (PEI) or other high-temperature thermoplastics have been considered suitable matrix for the magnetic fillers, thereby creating a much wider usage for magneto polymeric composite in applications that requires higher temperature (typically above 175 oC). Thus, this review discusses the fabrication processes-injection molding, fused filament fabrication;magnetic performance, and applications of high-performance thermoplastic-based magnetic composites that can be viable for stringent engineering devices such as sensors, actuators, motors, and generators. © 2023 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Fabrication

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Enhancing Sp3 Content in Diamond-Like Carbon Thin Film Electrodes by Pulsed Laser Annealing for Durable Charge Storage Performance

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SSRN 2024年

作者： Karmakar, Subrata Halim, Md Abdul Sultana, Maria Sarkar, Pallab Kumar Emu, Injamamul Hoque Jaimes-Leal, Ana Haque, Ariful Electrical Engineering Ingram School of Engineering Texas State University TX78666 United States Civil Engineering Ingram School of Engineering Texas State University TX78666 United States Materials Science Engineering and Commercialization Program Texas State University TX78666 United States

In this work, diamond-like carbon (DLC) thin film electrodes were grown on Si substrate by pulsed laser deposition (PLD) technique, and the implication of pulsed laser annealing (PLA) treatment on their electrochemical supercapacitor performance was examined by two electrode systems in 1M Na2SO4 electrolyte solutions. The Raman spectra confirm signature of the D and G peaks of pristine DLC film at ~1352 cm-1 (1356 cm-1 after PLA) and 1591 cm-1 (1589 cm-1 after PLA), and appearance of minor T2g (diamond) (1332 cm-1) peaks with an increment of the sp3 content after PLA treatment. The X-ray photoelectron spectroscopy (XPS) spectra were deconvoluted into three different contributions C-C (sp2), C-C (sp3), and C-O, and their sp3 percentages were estimated ~48.6%, and 64.5% before and after annealing. The area under cyclic voltammetry (CV) curve and galvanostatic charging discharging (GCD) performance of PLA-treated DLC film were improved and the highest areal-specific capacitance was obtained to be ~48.25 mF/cm2 for scan rate of 5 mV/s and 36.01 mF/cm2 for current density of 2 mA/cm2, respectively. Excellent charging discharging cyclic stability of PLA treated electrode was observed over 5000 cycles, and Coulombic efficiency and capacitance retention were determined to be ~93.5% and ~97.3%, respectively. © 2024, The Authors. All rights reserved.

关键词： Diamonds

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Mid-IR Gain of Tensile Germanium Waveguide Lasers with SiNx Stress Liners

Mid-IR Gain of Tensile Germanium Waveguide Lasers with SiNx ...

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2021 IEEE Photonics Society Summer Topicals Meeting Series, SUM 2021

作者： Reza, Md Shamim Gulyas, Istvan Wistey, Mark A. Materials Science Engineering and Commercialization Program Texas State University San MarcosTX78666 United States Department of Physics Texas State University San MarcosTX78666 United States

ISBN: (纸本)9781665416009

We used ab-initio and finite element strain modeling to explain high threshold current densities in reported tensile Ge lasers. Anisotropic strains improve carrier confinement but reduces optical confinement, and intervalence band absorption still dominates. Strain anisotropy increases Jth compared with simple slab models. © 2021 IEEE.

关键词： Germanium

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Mechanical performance of needle-punched carbon fiber reinforced phenolic composites

Mechanical performance of needle-punched carbon fiber reinfo...

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SAMPE 2021 Conference and Exhibition

作者： Trevino, Esmerehildo Belduque, Camila Tate, Jitendra Ingram School of Engineering Texas State University 601 University Drive San MarcosTX78666 United States Materials Science Engineering and Commercialization Program Texas State University 601 University Drive San MarcosTX78666 United States

ISBN: (纸本)9781934551394

Traditional composite laminates that are highly used in the aerospace and automotive industry have reinforcing fibers that lie in the X and Y orientation of the laminate or ply stack. The resulting composite product is one with anisotropic properties, being weaker in the Z orientation of the laminate. Composite failure will occur between the reinforcing layers at the resin rich interlayer. To improve the composite's resistance to delamination, a needle-punching process is utilized to re-orient parent carbon fibers thru the thickness of the dry fiber ply stack. The needlepunching equipment consists of a needle-board carrying rows of barbed needles. The needleboard drives the needles through the preform, and the barbs re-orienting the fibers in the Z direction. Rayon based 8-harness satin carbon fiber is needle-punched and infused with a phenolic resin using Vacuum Assisted Resin Transfer Molding (VARTM). Varying degrees of needle-punch density are evaluated for their respective inter-laminar shear strengths. A correlation model of needle-density to mechanical behavior was developed and fiber reorientation was analyzed by microscopic imaging. © 2021 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Needles

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SUSTAINABLE HIGH-QUALITY BIO-COMPOSITE OF NOVICE NATURAL FIBER-REINFORCED POLYLACTIC ACID (PLA) 8

SUSTAINABLE HIGH-QUALITY BIO-COMPOSITE OF NOVICE NATURAL FIB...

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8th Annual Composites and Advanced materials Expo, CAMX 2021

作者： Panta, Subash Alvizo, Elizabeth Nichol Candelas, Matt Thramann, Harrison Tate, Jitendra S. Ingram School of Engineering Texas State University 601 University Drive San MarcosTX78666 United States Materials Science Engineering and Commercialization Program Texas State University 601 University Drive San MarcosTX78666 United States

ISBN: (纸本)9781934551400

Current biodegradable plastics have inferior properties to non-biodegradable plastics. To overcome these challenges, this research is proposing to fabricate a biocomposite using a biodegradable polymer polylactic acid (PLA) as a matrix and natural fiber obtained from Giant Ragweed (Ambrosia trifeda). The addition of natural fibers into PLA is a challenge because of opposing hydrophilic and hydrophobic interfacial bonding between fiber and matrix. Experiments were conducted to reduce hydrophilic tendencies of the natural fibers by surface treatment with 2% maleic anhydride (MA) in xylene. To find the optimum fiber/matrix ratio, fibers were studied at 10 wt.% and 15 wt.%. The scope of this paper focuses on 10 wt.% due to its consistent fiber diameter compared to 15 wt.%. Single screw extrusion was employed for the filament manufacturing process, and samples were fabricated using fused filament fabrication additive manufacturing. SEM imaging was conducted to check the dispersion of fibers in the PLA matrix before and after surface treatment. Tensile and flexural properties were evaluated using ASTM standards D638 for the tensile test to study ultimate tensile strength and tensile modulus. Similarly, ASTM D790 for flexure test to study flexural strength and flexural modulus. The research has established detailed process parameters and analysis of maleic anhydride treated Ragweed reinforced PLA Biocomposites at 10 wt.% loading level. Copyright 2021. Used by CAMX – The Composites and Advanced materials Expo

关键词： Surface treatment

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Processing and characterization of high temperature phenolic nanocomposites

Processing and characterization of high temperature phenolic...

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SAMPE 2021 Conference and Exhibition

作者： Nahar, Aziza G. Omer, Liam Diaz, Matthew T. Tate, Jitendra S. Ingram School of Engineering Texas State University 601 University Drive San MarcosTX78666 United States Materials Science Engineering and Commercialization Program Texas State University 601 University Drive San MarcosTX78666 United States

ISBN: (纸本)9781934551394

As the performance of electronics and aerospace technologies increases, the demand for lightweight composites capable of maintaining the performance at high temperatures follows in tandem. Besides ablative applications these composites are playing a vital role as friction materials, insulative materials, and shell moldings material. Phenolic resin, SC-1008 exhibits hightemperature (Glass transition temperature, 250°C) and mechanical performance with extraordinary char yields in high-temperature environments. Zirconia and Alumina nanoparticles often enhances thermally and electrical insulative properties and increases thermal stability in nano structured composites. In this study, a rayon-based carbon reinforced phenolic composites composed of 2wt% Alumina Nanofibers and 5wt% Zirconia nanoparticles was fabricated using combination of hand layup and compression molding. Nanocomposite performance is highly dependent upon dispersion quality. Nanoparticles were dispersed in the phenolic resin using combination of 3-roll mill and sonication. Scanning electron microscopy (SEM) was performed on resin samples to determine uniform dispersion. Char yield was evaluated using Thermal Gravimetric Analysis (TGA). Tensile and flexural properties were evaluated using appropriate ASTM standards. Oxyacetylene test bench (OTB) was used to determine the ablation rate, heat soak temperature, and mass-loss rate. The ablative performance of newly developed nanocomposites was compared with industry standard, MX-4926. © 2021 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Nanocomposites

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Why Room Temperature GeSn Lasers Need Carbon

Why Room Temperature GeSn Lasers Need Carbon

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IEEE International Conference on Group IV Photonics

作者： Tuhin Dey Augustus W. Arbogast Qian Meng Shamim Reza Aaron Muhowski Joshua Cooper Rachel S. Goldman Thales Borrely Seth R. Bank Mark A. Wistey Materials Science Engineering and Commercialization Program Texas State University San Marcos Texas USA Department of Physics Texas State University San Marcos Texas USA Department of Electrical and Computer Engineering University of Texas at Austin Austin Texas USA Department of Materials Science and Engineering University of Michigan Ann Arbor MI USA Departments of MSE Physics and EECS University of Michigan Ann Arbor MI USA Department of Physics and MSEC Program Texas State University San Marcos Texas USA

Device models show GeSn lasers are limited by weak electron and photon confinement. Adding carbon offers strong conduction band offsets, freeing SiGeSn layers for separate confinement heterostructures, reducing thresh...

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Shallow and Deep States of Beryllium Acceptor in GaN: Why Photoluminescence Experiments Do Not Reveal Small Polarons for Defects in Semiconductors

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Physical Review Letters 2021年第2期126卷 027401-027401页

作者： D. O. Demchenko M. Vorobiov O. Andrieiev T. H. Myers M. A. Reshchikov Department of Physics Virginia Commonwealth University Richmond Virginia 23220 USA Materials Science Engineering and Commercialization Program Texas State University San Marcos Texas 78666 USA

Currently, only one shallow acceptor (Mg) has been discovered in GaN. Here, using photoluminescence (PL) measurements combined with hybrid density functional theory, we demonstrate that a shallow effective-mass state also exists for the BeGa acceptor. A PL band with a maximum at 3.38 eV reveals a shallow BeGa acceptor level at 113±5 meV above the valence band, which is the lowest value among any dopants in GaN reported to date. Calculations suggest that the BeGa is a dual-nature acceptor with the “bright” shallow state responsible for the 3.38 eV PL band, and the “dark,” strongly localized small polaronic state with a significantly lower hole capture efficiency.

关键词： Defects Electronic structure Doped semiconductors Semiconductor compounds Density functional calculations Photoluminescence

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MECHANICAL, THERMAL, AND MORPHOLOGICAL PROPERTIES' COMPARISON OF 3D PRINTED SURFACE TREATED RAGWEED FIBER REINFORCED BIO-COMPOSITES WITH COMMERCIAL BAMBOO FIBER REINFORCED BIO-COMPOSITE

MECHANICAL, THERMAL, AND MORPHOLOGICAL PROPERTIES' COMPARISO...

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SAMPE 2022 Conference and Exhibition

作者： Panta, Subash Tate, Yash Omer, Liam Mix, Ken Ingram School of Engineering Texas State University 601 University Drive San MarcosTX78666 United States Department of Agricultural Sciences Texas State University 601 University Drive San MarcosTX78666 United States Materials Science Engineering and Commercialization Program Texas State University 601 University Drive San MarcosTX78666 United States James Bowie Highschool 4103 W Slaughter Ln AustinTX78749 United States

ISBN: (纸本)9781934551417

Applications of natural fiber-based composites continue to grow in many industries as sustainability and recyclability of products gain popularity. Kenaf, Jute, Coir, and Flax based bio-composites have steadily gained traction as an alternative to synthetic based fiber composites. Giant ragweed (Ambrosia trifida), a common weed, has shown promise as another biological source of fiber for composite reinforcement. Unfortunately, the hydrophilic nature of ragweed is incompatible with most nonpolar polymers leading to weak interfacial adhesion between the fiber and matrix. However, treatment of ragweed fibers post-harvest can alleviate incompatibility, yielding a fiber matrix composite with competitive strength and stiffness. The increasing availability of sustainable composites is crucial as the world continues to distance itself from oil-based products. Therefore, this study will determine the mechanical benefits of using a silane treated ragweed fiber within a polylactic acid (PLA) polymer matrix. The novel composite will be compared to commercially available bio-composites reinforced with bamboo fibers. Mechanical testing will be performed under tensile, and flexural loading. In addition, composites will be examined using scanning electron microscopy (SEM) to determine matrix fiber adhesion and surface effects of silane treatment. Energy Dispersive X-ray Spectroscopy (EDAX) is used to determine the treatments density on the sample surface. The composites coefficient of thermal expansion will be compared using thermomechanical analysis (TMA). Copyright 2022. Used by the Society of the Advancement of Material and Process engineering with permission.

关键词： Surface treatment

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MECHANICAL PROPERTIES OF RE-EXTRUDED SrFe12O19(OP-71)/PA12 FILAMENTS VIA TWIN-SCREW EXTRUSION FOR FUSED FILAMENT FABRICATION 8

MECHANICAL PROPERTIES OF RE-EXTRUDED SrFe12O19(OP-71)/PA12 F...

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8th Annual Composites and Advanced materials Expo, CAMX 2021

作者： Belduque, Camila Ahmed, Tanjina Geerts, Wilhelmus Panta, Subash Thramann, Harrison Omer, Liam Tate, Jitendra Ingram School of Engineering Texas State University 601 University Drive San MarcosTX78666 United States Materials Science Engineering and Commercialization Program Texas State University 601 University Drive San MarcosTX78666 United States Department of Physics Texas State University 601 University Drive San MarcosTX78666 United States

ISBN: (纸本)9781934551400

The most employed permanent and soft magnetic materials, such as Strontium Ferrite (SrFe12O19) is attractive to be dispersed in polymers such as polyamides or ABS to obtain new composites in the additive manufacturing industry. Specifically fused filament fabrication offers a low cost, accessible, and environmentally friendly process. Products such as MRI devices, robots for drug delivery and automotive parts are some of the potential applications that can be developed given a highly filled matrix with homogeneously dispersed magnetic fillers. Twin-screw extrusion is recognized as one of the efficient methods to obtain uniform dispersion of magnetic fillers. Uniform dispersion is key factor in enhancement in mechanical and magnetic properties. In this project, 50wt% SrFe12O19/Pa12 magnetic powder was dispersed in PA12 matrix using twin-screw extrusion. Mechanical properties are analyzed in both extruded and re-extruded composites using MTS 810 following ASTM standards. Double pass extruded SrFe12O19/Pa12 (OP-71/PA12D) samples exhibited unprecedented tensile and flexural strength increases compared to both neat PA12 and single pass extruded SrFe12O19/Pa12 (OP-71/PA12). Copyright 2021. Used by CAMX – The Composites and Advanced materials Expo

关键词： 3D printers

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