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SAMPE 2024 Conference and Exhibition

作者： Sufian, Muhammad A. Sheley, Rahul R. Shadman, Wasi Tanim, Ibrahim K. Cooper, Benicia Tate, Jitendra Materials Science Engineering and Commercialization Program Texas State University 601 University Drive San MarcosTX78666 United States Ingram School of Engineering Texas State University San MarcosTX78666 United States

ISBN: (纸本)9781934551455

Masked Stereolithography (MSLA) is a 3D printing technique that uses an LCD screen and a UV LED light source operated digitally to selectively cure photosensitive resin, forming a three-dimensional object through successive layers cured upon one another. Using MSLA offers superior dimensional precision, efficient surface finish, and printing resolution limits of 30 µm to 140µm, allowing to obtain complex 3D geometries. Using this technique gives advantage of astonishing results in the resolution of 3d printer surface but many times lacks in obtaining desired material properties compared to other available techniques. To overcome this lacuna one of the methods is to create a thin layer coating of nickel plating over the resin which enhances the mechanical strengths, heat diffraction, and resistance to chemicals. In this scenario, the CTE of resin does not align with that of nickel metal. This results in internal stresses when exposed to the harsh environment of space causing the part failure. In this work, an attempt has been made by using epoxy as a base resin and introducing nanomaterial Multi-Walled Carbon Nanotubes (MWCNTs) to reduce the CTE. Out of all different loading levels of MWCNT 0.5 wt% loading showed maximum reduction in terms of CTE which is more than 25% compared to neat resin. Tensile strength and tensile modulus increased by more than 47% and 61%. While flexural modulus increased by 66% and percentage elongation showed a reduction by 38% compared to neat resin. © 2024 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Nickel plating

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DEVELOPMENT OF A LOW THERMAL EXPANSION SLA RESIN FOR NICKEL PLATING APPLICATIONS

DEVELOPMENT OF A LOW THERMAL EXPANSION SLA RESIN FOR NICKEL ...

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SAMPE 2022 Conference and Exhibition

作者： Hammond, Connor Tate, Jitendra Texas State University Ingram School of Engineering 601 University Drive San MarcosTX78666 United States Materials Science Engineering and Commercialization Program

ISBN: (纸本)9781934551417

Applications in the aerospace and defense industries are demanding stronger and lighter parts for use in aircraft and spacecraft. Additive manufacturing (AM) has allowed engineers to create complex parts that would be difficult or even impossible to create through standard manufacturing methods. Stereolithography (SLA) additive manufacturing offers an easy and affordable way to create extremely complex and detailed geometries by selectively curing thin layers of a photopolymer resin. To increase part performance, a nickel coating can then be applied to increase strength, chemical resistance, and heat deflection. This works well in lab environments, but in harsh conditions such as those presented in aerospace applications, large thermal gradients cause the nickel and resin to expand at different rates. This causes high internal stresses and can even result in part failure. The development of a strong, reliable resin that could match the coefficient of thermal expansion of nickel could fill a gap in additive manufacturing between fully plastic or metal parts, allowing for production of high-performance parts. In this paper we will cover the development of an SLA resin with good mechanical properties and a thermal expansion rate similar nickel for aerospace applications. Copyright 2022. Used by the Society of the Advancement of Material and Process engineering with permission.

关键词： 3D printers

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FATIGUE AND FATIGUE DAMAGE MECHANISMS OF HIGH-TEMPERATURE THERMOPLASTICS COMPOSITES: A REVIEW 10

FATIGUE AND FATIGUE DAMAGE MECHANISMS OF HIGH-TEMPERATURE TH...

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10th Composites and Advanced materials Expo, CAMX 2024

作者： Sheley, Rahul Tate, Jitendra Tehrani, Mehran Materials Science Engineering and Commercialization Program United States Ingram School of Engineering Texas State University 601 University Drive San MarcosTX78666 United States Jacobs School of Engineering University of California 9500 Gilman DriveLa Jolla San DiegoCA92093 United States

ISBN: (纸本)9781934551462

The growing demand for materials that can withstand extreme conditions in the aerospace and automotive industries has led to significant research on high-temperature polymeric composites. These composites are designed to maintain their structural integrity and mechanical properties at temperatures above 300 degrees Celsius. The development of these advanced materials is crucial for improving the performance and safety of aerospace and automotive components operating in extreme environments. Traditionally, thermosets were the most favorable for working in extreme environmental conditions due to their superior heat resistance and durability. Researchers have recently focused more on the development of reinforced thermoplastic composites. The specific challenges faced by researchers and engineers when developing high-temperature composites include maintaining structural integrity and mechanical properties under extreme conditions. The specific techniques used by researchers to modify and reinforce high-temperature thermoplastics for enhanced performance include the use of advanced nanofillers and their dispersion methods, fiber reinforcement strategies, flame retardant formulations, and toughening agent incorporation. The research has shown promising results in improving the mechanical, thermal, and physical performance of thermoplastics composites. However, challenges remain in predicting the long-term performance and durability of high-temperature thermoplastics in aerospace and automotive environments. These materials are essential for applications requiring thermal and chemical resistance, but their deployment in critical environments exposes them to conditions that can lead to fatigue failure through different mechanisms. These mechanisms include oxidation, thermal degradation, matrix crystallinity changes, fiber-matrix interface degradation, residual stresses, creep, and microcracking. This article aims to review the approaches various authors have adopted to ana

关键词： Durability

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Phase coherence and electron-electron interactions in epitaxial strained SrTiO3 films on Si(001)

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Physical Review B 2025年第15期111卷 155307-155307页

作者： Ryan J. Cottier Barry D. Koehne John T. Miracle Daniel A. Currie Craig H. Swartz Nikoleta Theodoropoulou Department of Physics Texas State University San Marcos Texas 78666 USA Materials Science Engineering and Commercialization Program Texas State University San Marcos Texas 78666 USA

Oxide heterostructures based on SrTiO3 have emerged as a rich platform for exploring physical phenomena, most notably conductivity at interfaces between insulators. In this study, we investigate the electronic properties of an oxide-semiconductor heterostructure—SrTiO3 films grown epitaxially on Si(001). The lattice mismatch induces epitaxial strain, breaking the cubic symmetry of SrTiO3 and resulting in tetragonal distortion. Magnetotransport measurements reveal that the temperature and magnetic field dependence of the conductivity are dominated by two-dimensional quantum effects, weak localization, and electron-electron interactions. The low-temperature electronic properties indicate quantum confinement, strong electron correlations, exchange interactions, and Zeeman spin splitting. These findings underscore the potential of the SrTiO3/Si heterostructure for designing oxide-based quantum devices.

关键词： Lattice mismatch

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EFFECT OF BALL MILLING ON THE MAGNETIC PERFORMANCE OF STRONTIUM FERRITE (SrFe12O19) POWDERS

EFFECT OF BALL MILLING ON THE MAGNETIC PERFORMANCE OF STRONT...

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SAMPE 2024 Conference and Exhibition

作者： Arigbabowo, Oluwasola K. Hassan, Mehadi Asadollahnejad, Azin Islam, Md Shafikul Price, Holt Geerts, Wilhelmus J. Tate, Jitendra Materials Science Engineering and Commercialization Program Texas State University 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)9781934551455

The primary advantage of the high energy ball milling (HEBM) process is its ability to synthesize a homogeneous mixture with submicron (up to nanoscale) particle size. This approach is a viable process for particle size reduction and grain refinement of magnetic powders, which affects their domain structure and by extension the resulting magnetic properties. In this research, we designed a 9-ball milling experiment by keeping the rotational speed constant at 300rpm and varying the ball-to-powder ratio of 5:1, 8:1, and 10:1 for 6hrs, 10hrs, and 14hrs milling times. The strontium ferrite magnetic powders subjected to HEBM were analyzed for crystallite size and behavior via XRD, particle size reduction via SEM/ImageJ software/originLabPro, and magnetic performance via powder-based VSM measurement. The magnetic performance of the ball-milled strontium ferrite powders shows a good combination of appreciable increment in the S-values (a ratio of the remanence to saturation magnetization) and a considerable decline in coercivity ( © 2024 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Grain refinement

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MAGNETIC PROPERTIES EVALUATION OF POLYAMIDE 4.6 BONDED MAGNETIC COMPOSITE

MAGNETIC PROPERTIES EVALUATION OF POLYAMIDE 4.6 BONDED MAGNE...

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SAMPE 2024 Conference and Exhibition

作者： Karkhanis, Pratik Arigbabowo, Oluwasola K. Gonzalez, Aaron J. Inamdar, Shreyas Ahmed, Tanvir Herrera, Andres Geerts, Wilhelmus J. 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 Department of Physics Texas State University 601 University Drive San MarcosTX78666 United States

ISBN: (纸本)9781934551455

Bonded magnetic composites combine the cost-effectiveness, low density, and manufacturing flexibility of conventional polymer binders with the unique magnetic characteristics of magnetic powders/fillers to form multifunctional magneto polymeric composites that offer superior properties to conventional sintered magnets. In this study, a co-rotating twin screw extruder was used to fabricate 20 and 40 wt.% strontium ferrite/polyamide 4.6 bonded magnetic composites viable for fused filament fabrication 3D printing. The characterization conducted on the bonded magnetic composites was scanning electron microscopy, simultaneous differential thermogravimetry, and vibrating sample magnetometry. The microstructure of the bonded composite exhibited a uniform platelet morphology of the strontium ferrite magnetic particles. There was no observable depreciation in the melting transitions, which suggests a thermally resistant magnetic composite. An appreciable increment in % crystallinity of 13 and 20% for 20wt.% and 40wt.% strontium ferrites bonded magnets were observed. This is attributable to the heterogeneous nucleation phenomenon, where the metal powders act as nucleation sites for increased crystalline domains. The bonded composite exhibited significant magnetic anisotropy, with the remanence (Mr), which is the most important property for magnetic application significantly increasing to 49.8% along the easy direction in comparison to the hard axis. This suggests the viability of the fabricated bonded composites in viable in producing anisotropic bonded magnetic devices, which are considered to exhibit stronger magnetic properties. © 2024 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Magnetic anisotropy

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Growth, optimization and high-temperature performance of GeO2/Ga2O3 MOSCAPs

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SSRN 2024年

作者： Manikanthababu, N. Karmakar, Subrata Shiam, Ishtiaq Firoz Emu, Injamamul Hoque Haque, Ariful Droopad, Ravi Electrical Engineering Ingram School of Engineering Texas State University San MarcosTX78666 United States Materials Science Engineering & Commercialization Program Texas State University San MarcosTX78666 United States

In this study, GeO2 thinfilms were grown by pulsed laser deposition (PLD) technique on β-Ga2O3, (―201) single crystal substrates to fabricate metal-oxide-semiconductor capacitors (MOSCAPs), and test these devices at high temperatures. The GeO2 thinfilms with bandgap of 5.11 eV are amorphous in nature, confirmed by X-ray diffraction, and the X-ray photoelectron spectroscopy (XPS) confirms the formation of GeO2. The Ge 3d deconvoluted peak at 32.4 eV confirms the GeO2 bonding, with an additional peak found at 30.9 eV resembling a small portion of GeO2-x. The Au/GeO2/Ga2O3 MOSCAPs were fabricated to test the high-temperature performance up to 300 oC. The I–V graphs showed an increase in the reverse leakage current by 3.9×104 A (nearly four orders of magnitude) as the temperature raised from room temperature (RT) to 300 oC. Since the GeO2-x presence, the current conduction mechanism of Poole-Frenkel emission was utilized to get the trap level of 0.8 V (below the conduction band of GeO2) with an activation energy of 0.55 eV. C–V measurements also show a significant contribution of defects in the flat-band voltage shift and the change of the slopes. This indicates an increase in the oxide and interface-trapped charges. The density of oxide-trapped charges (DO) increased from 3.9×1012 cm-2 to 1.3×1013 cm-2, as the temperature reached 300 oC. Similarly, the density of interface-trapped charges (DI) increased from 3.4×1012 cm-2 at RT to 1.1×1013 cm-2 at 300 oC. © 2024, The Authors. All rights reserved.

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N- and P-Type Doping of Diamonds: A Review

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SSRN 2024年

作者： Sultana, Maria Karmakar, Subrata Haque, Ariful Ingram School of Engineering Texas State University San MarcosTX78666 United States Materials Science Engineering & Commercialization Program Texas State University San MarcosTX78666 United States

Diamond has been one of the most investigated ultrawide bandgap (UWBG) semiconductors for optoelectronics, superconductors, energy, and quantum applications for almost half of a century owing to its unique properties. Diamonds' intrinsic features- a large bandgap (5.47 eV), an extremely high breakdown voltage (10 MV/cm), the highest thermal conductivity (2200 W/m-K), and very high radiation-tolerance, make them promising for high-power, high-frequency devices suitable for high-temperature and extreme radiation environments. Since the demand for high-speed consumer electronics with large power and faster data handling capacity is rising at an unprecedented rate in the post-COVID era, diamonds' excellent mobility of electrons and holes (4500 and 3800 cm2/V-s) make them ideal for servers and systems. To materialize these multipurpose devices with higher efficiency and endurance than Si and SiC-based technologies, diamonds with good p- and n-type conductivity are needed. Therefore, nearly several decades-long efforts have been devoted to understanding and controlling the carrier conductivities in diamonds. Furthermore, diamonds' color centers' remarkable application as the qubit for next-generation quantum computers has also sparked interest in investigating diamond point defects at the quantum level. Hence, it is necessary to comprehensively study the fabrication, doping, and applications in semiconducting and quantum devices to stay relevant to the diamond revolution and thus advance this flourishing field. Therefore, this review article summarizes the current status and breakthroughs in diamond doping and devices fabricated using doped diamonds to provide an overview of the challenges and successes in using this highly promising UWBG material in electronic, superconducting, and quantum applications. © 2024, The Authors. All rights reserved.

关键词： Diamonds

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MECHANICAL AND ELECTRICAL CHARACTERIZATION OF 3D PRINTED POLYAMIDE 6 NANOGRAPHENE COMPOSITE FOR ELECTROSTATIC DISCHARGE APPLICATIONS

MECHANICAL AND ELECTRICAL CHARACTERIZATION OF 3D PRINTED POL...

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SAMPE 2022 Conference and Exhibition

作者： Arigbabowo, Oluwasola K. Omer, Liam Tate, Jitendra Materials Science Engineering and Commercialization Program Texas State University 601 University Drive San MarcosTX78666 United States Ingram School of Engineering Texas State University 601 University Drive San MarcosTX78666 United States

ISBN: (纸本)9781934551417

Polyamide 6 (PA 6) is an engineering thermoplastic that can be used to develop polymer nanocomposite with high potential in electrostatic discharge applications. By the incorporation of nanofillers in PA 6 to enhance multifunctional properties, PA 6 nanocomposites can serve as technological alternatives to commercial thermoplastics for 3D printing via fused deposition modelling (FDM). Hence, this study evaluated the mechanical and electrical properties of 3D printed PA6 nanographene composites for electrostatic discharge applications. 2, 4 and 6 wt.% of Graphene Nanoplatelets (GNP) was compounded with PA6 using co-rotating twin screw extruder to produce 1.75mm diameter monofilaments for FDM 3D printing. The test samples were printed using commercial-off-the-shelf (COTS) 3D printer, Lulzbot TAZ 6 FDM printer. Morphology, mechanical and electrical characterization was carried out according to their respective ASTM standard. An improvement in tensile and flexural properties were observed with an increase in nanographene addition, and a maximum improvement of 61.4 and 55.9% in tensile and flexural modulus respectively was recorded at 6wt% loading level. Electrical conduction of the insulative polyamide 6 matrix was enhanced by an appreciable reduction of its volume resistivity to 1011 Ω.cm by 2wt% nanographene loading, which seems promising for manufacturing static discharge products. Copyright 2022. Used by the Society of the Advancement of Material and Process engineering with permission.

关键词： Graphene

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Epitaxial Growth and Characterization of Copper Gallate (CuGa2O4) Thin Films by Pulsed Laser Deposition

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SSRN 2024年

作者： Emu, Injamamul Hoque Samuels, Brian C. Karmakar, Subrata Hamid, Md. Abdul Shiam, Istiaq Firoz Sarkar, Pallab Kumar Tasnim, Ayesha Haque, Ariful Droopad, Ravi Ingram School of Engineering Texas State University San MarcosTX78666 United States Materials Science Engineering & Commercialization Program Texas State University San MarcosTX78666 United States

High-quality crystalline copper gallate (CuGa2O4) thin films were grown on c-plane sapphire substrates using the pulsed laser deposition (PLD) technique by optimizing the growth parameters (i.e., temperature, oxygen chamber pressure, and laser energy density). The obtained XRD patterns validated that the preferred orientation of the crystalline CuGa2O4 thin film is along the [111] direction, and the crystallinity of the films improved with increasing substrate temperature while maintaining a constant O2 pressure, as assessed by measuring the full width at half maximum (FWHM) of the prominent (222) plane. Reducing the oxygen pressure leads to the emergence of β-Ga2O3 peaks rather than the CuGa2O4 peaks due to the incomplete oxidation of copper (Cu). Subsequent XRD phi (φ) scans revealed a sixfold rotational symmetry of CuGa2O4 and a 30º epitaxial relationship between the film and the sapphire substrate. X-ray photoelectron spectroscopy (XPS) spectra confirmed the presence of Cu1+, Cu2+, and Ga3+ oxidation states in the films. Increasing laser energy density resulted in the complete oxidation of Cu and an increase in the film thickness from 51.8 nm to 183.4 nm. The direct bandgap of CuGa2O4 films was determined to be approximately 4.51±0.01 eV by analyzing the UV-Vis absorbance spectra using the Tauc equation. The refractive index was found to be approximately 2.05±0.01 based on the spectroscopic ellipsometry data. While the impact of increasing laser energy density was negligible on the parameters such as crystal structure, rotational symmetry, oxidation states of gallium (Ga), oxygen (O), bandgap, and refractive index of CuGa2O4 thin film, notable alterations in the oxidation state of Cu and film thickness were observed. © 2024, The Authors. All rights reserved.

关键词： Thin films

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