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SSRN 2022年

作者： Eaves-Rathert, Janna Moyer-Vanderburgh, Kathleen Wolfe, Kody Zohair, Murtaza Pint, Cary L. Department of Mechanical Engineering Vanderbilt University NashvilleTN37235 United States Interdisciplinary Materials Science Program Vanderbilt University NashvilleTN37235 United States Department of Mechanical Engineering Iowa State University AmesIA50011 United States

In recent years, the supply chain shock due to the rapid rise of the lithium-ion battery has made alternative chemistries, such as sodium-ion batteries, appealing for low-cost and large-scale energy storage. Meanwhile, the falling popularity of lead acid batteries has potential consequences for the price of scrap lead and its penetration into waste streams. In this work, we upcycle lead alloys from a used lead acid battery into a next-generation sodium-ion system for ultra-low-cost rechargeable batteries. Through evaluation of sodium storage capacity and rate capability, we study the rich interplay of Pb-Sb-Sn microstructure and properties which can be controlled through simple heat treatment of unrefined powders to reach a maximum specific capacity of 522 mAh.g-1. When cycled in the presence of glyme-based electrolytes, the ternary alloys nanostructure to facilitate an optimal balance of power and cycle life. These findings that demonstrate how defects can be leveraged to improve performance bring exciting implications for reducing cost and mitigating volume expansion in other high-value commodities, like tin or silicon. © 2022, The Authors. All rights reserved.

关键词： Lead acid batteries

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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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Influence of Grain Size on Strain-Induced Phase Transformation in a Crconi Multi-Principal Element Alloy

SSRN

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SSRN 2024年

作者： Bertoli, Gustavo Clarke, Amy J. Kaufman, Michael J. Kiminami, Claudio Shyint Gil Coury, Francisco Colorado School of Mines George S. Ansell Department of Metallurgical and Materials Engineering 1500 Illinois St. GoldenCO80401 United States Federal University of São Carlos Graduate Program in Materials Science and Engineering Rod. Washington Luis km 235 SP-310 SP São Carlos13565-905 Brazil Sigma Manufacturing Sciences Division Los Alamos National Laboratory Los AlamosNM87545 United States Federal University of São Carlos Department of Materials Engineering Rod. Washington Luis km 235 SP-310 SP São Carlos13565-905 Brazil

A Cr40Co40Ni20 (at.%) alloy with different grain sizes was analyzed through in-situ synchrotron X-ray diffraction during tensile testing. The FCC starting structure underwent a partial strain-induced transformation to HCP (TRIP effect) and the percent transformed was measured throughout the deformation. The critical stress required to form a certain HCP fraction was shown to follow a Hall-Petch relation (σ = σ0,HCP + KHCPd-0.5), with the Hall-Petch slope being approximately the same for yield stress and TRIP effect (Ky ~ KHCP ~ 650 MPa/μm-0.5). The HCP fraction and HCP formation rate are controlled by the strain level, being insensitive to grain size in terms of strain. Furthermore, this work developed a Hall-Petch-based model that correlates the applied stress, the transformed phase fraction, and the initial FCC grain size. It predicts the stress required to form a certain HCP fraction, or the fraction formed when a certain stress is applied. We also proposed a mechanism to explain the grain size dependence of the TRIP effect and discuss how the TRIP effect and its early activation in the Cr40Co40Ni20 alloy provide high work-hardening capacity, which improves ductility and toughness. Here, a refined FCC grain size (1.3 μm) was shown to increase the yield stress by at least 100% (417 → 834 MPa), compared to a coarser grain material (22.4 μm), while maintaining a high ductility of 41%. This work contributes to a better understanding of the deformation mechanisms, mainly the strain-induced phase transformation (TRIP), highlighting their impact and importance on mechanical properties. © 2024, The Authors. All rights reserved.

关键词： Ductility

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Changes in fluoride removal ability of chicken bone char with changes in calcination time

International Journal of Ceramic Engineering and Science

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International Journal of ceramic engineering and science 2020年第2期2卷 83-91页

作者： Kikuchi, Masanori Arioka, Yuki Tafu, Masamoto Irie, Mitsuteru Bioceramics Group National Institute for Materials Science Tsukuba Japan Master's Program in Life Science Innovation University of Tsukuba Tsukuba Japan Department of Applied Chemistry and Chemical Engineering Toyama College National Institute of Technology Toyama Japan Faculty of Engineering University of Miyazaki Miyazaki Japan

Changes in fluoride removal ability of chicken bone char (CBC) were investigated by both remained amounts of carbon including organic substances and crystallite size of hydroxyapatite in the CBC. Carbon contents in CBC were controlled by heating time at 600°C. Although temperature for crystal-grain growth for HAp, 650°C, was higher than 600°C, crystallite size of HAp in CBC increased with heating time. Fluoride ion removal ability positively related to the amount of remaining carbon and negatively related to the square of crystallite size, as an index of surface area, of HAp. These results suggested that fluoride ion removal from water by CBC is not only by ion exchange and/or dissolution-precipitation process, but also by adsorption by carbon and/or temporal capture of fluoride ion by microstructure of carbonate in CBC before immobilize it in apatite structure. © 2019 The Authors. International Journal of ceramic engineering & science published by Wiley Periodicals, Inc. on behalf of American ceramic Society.

关键词： Crystallite size

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Micromechanical Origin of Heat Transfer to Granular Flow

arXiv

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arXiv 2023年

作者： Zhang, Xintong Adapa, Sarath Feng, Tianshi Zeng, Jian Chung, Ka Man Ho, Clifford Albrecht, Kevin Chen, Renkun Department of Mechanical and Aerospace Engineering University of California San Diego La Jolla CA92093 United States Program in Materials Science and Engineering University of California San Diego La Jolla CA92093 United States Concentrating Solar Technologies Department Sandia National Laboratories 1515 Eubank Blvd. SE AlbuquerqueNM87123 United States

Heat transfer across a granular flow is comprised of two resistances in series: near the wall and within the bulk particle bed, neither of which is well understood due to the lack of experimental probes to separate their respective contribution. Here, we use a frequency modulated photothermal technique to separately quantify the thermal resistances in the near-wall and the bulk bed regions of particles in flowing states. Compared to the stationary state, the flowing leads to a higher near-wall resistance and a lower thermal conductivity of bulk beds. Coupled with discrete element method simulation, we show that the near-wall resistance can be explained by particle diffusion in granular flows. Copyright © 2023, The Authors. All rights reserved.

关键词： Heat resistance

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Machine learning moment tensor potential for modeling dislocation and fracture in L10−TiAl and D019−Ti3Al alloys

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Physical Review materials 2023年第10期7卷 103602-103602页

作者： Ji Qi Z. H. Aitken Qingxiang Pei Anne Marie Z. Tan Yunxing Zuo M. H. Jhon S. S. Quek T. Wen Zhaoxuan Wu Shyue Ping Ong Materials Science and Engineering Program University of California San Diego 9500 Gilman Dr Mail Code 0448 La Jolla California 92093-0448 USA Institute of High Performance Computing (IHPC) Agency for Science Technology and Research (A*STAR) 1 Fusionopolis Way Connexis #16-16 Singapore 138632 Republic of Singapore Department of NanoEngineering University of California San Diego 9500 Gilman Dr Mail Code 0448 La Jolla California 92093-0448 USA Department of Mechanical Engineering The University of Hong Kong Hong Kong SAR China Department of Materials Science and Engineering City University of Hong Kong Hong Kong SAR China Hong Kong Institute for Advanced Study City University of Hong Kong Hong Kong SAR China

Dual-phase γ-TiAl and α2−Ti3Al alloys exhibit high strength and creep resistance at high temperatures. However, they suffer from low tensile ductility and fracture toughness at room temperature. Experimental studies show unusual plastic behavior associated with ordinary and superdislocations, making it necessary to gain a detailed understanding on their core properties in individual phases and at the two-phase interfaces. Unfortunately, extended superdislocation cores are widely dissociated beyond the length scales practical for routine first-principles density-functional theory (DFT) calculations, while extant interatomic potentials are not quantitatively accurate to reveal mechanistic origins of the unusual core-related behavior in either phases. Here, we develop a highly accurate moment tensor potential (MTP) for the binary Ti-Al alloy system using a DFT dataset covering a broad range of intermetallic and solid solution structures. The optimized MTP is rigorously benchmarked against both previous and new DFT calculations, and unlike existing potentials, is shown to possess outstanding accuracy in nearly all tested mechanical properties, including lattice parameters, elastic constants, surface energies, and generalized stacking fault energies (GSFE) in both phases. The utility of the MTP is further demonstrated by producing dislocation core structures largely consistent with expectations from DFT-GSFE and experimental observations. The new MTP opens the path to realistic modeling and simulations of bulk lattice and defect properties relevant to the plastic deformation and fracture processes in γ-TiAl and α2−Ti3Al dual-phase alloys.

关键词： Interatomic & molecular potentials Alloys Machine learning

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Novel Pluronic Polymer-Coated Carbon Black Nanoparticles as Highly Stable and Safe Biocompatible Black Tattoo Pigments

SSRN

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SSRN 2024年

作者： Oh, Hyeryeon Lee, Jin Sil Son, Panmo Ryu, Hyeonyeol Kim, On Beol Choi, Won Il Center for Bio-Healthcare Materials Bio-Convergence Materials R&D Division Korea Institute of Ceramic Engineering and Technology 202 Osongsaengmyeong 1-ro Osong-eup Heungdeok-gu Chungbuk Cheongju28160 Korea Republic of School of Materials Science and Engineering Gwangju Institute of Science and Technology 123 Cheomdan-gwagiro Buk-gu Gwangju61005 Korea Republic of Department of Applied Bioengineering Graduate School of Convergence Science and Technology Seoul National University Seoul08826 Korea Republic of Korea Conformity Laboratories 8 Gaetbeol-ro 145 beon-gil Yeonsu-gu Incheon21999 Korea Republic of Gbionic Corp. 101-1204 Harmony-ro Yeonsu-gu Incheon144 Korea Republic of

The tattoo industry has evolved in recent decades with the increasing prevalence of tattooing. However, developing ink components, specifically pigments with adequate stability and biocompatibility under physiological conditions, remains challenging. In this study, to develop safe pigments for tattoo inks, carbon black (CB) has been stabilized with different types of Pluronic polymers and characterized in vitro and in vivo. The effects of the polymer templates on the preparation, morphology, and properties of Pluronic-coated carbon black nanoparticles (CB/Plu NPs) have been investigated and optimized using various analytical techniques. In particular, CB/Plu NPs with PF127 at a weight ratio of 1:5 exhibit a high coating yield and dispersion stability. CB/Plu NPs with PF127 have a spherical morphology with uniform sizes of 158 nm and do not cause any cytotoxic effect, cellular morphological changes, or oxidative stress in vitro. Intradermally injected CB/Plu NPs maintain an intense black color for 16 weeks without causing histological changes in the isolated dorsal skin of rats. Our results suggest that aqueous dispersions of CB/Plu NPs can be used as black tattoo inks exhibiting enhanced stability and safety. © 2024, The Authors. All rights reserved.

关键词： Nanoparticles

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Coherent Acoustic Phonons in Bi2Se3 Ultrathin Films Probed by Femtosecond, Optical Pump-Probe Spectroscopy

Coherent Acoustic Phonons in Bi2Se3 Ultrathin Films Probed b...

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CLEO: Fundamental science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Cheng, Jing Niherysh, Kiryl A. Francis, Peter Chakraborty, Debamitra Lombardi, Floriana Erts, Donats Prischepa, Serghej L. Laszcz, Adam Komissarov, Ivan V. Sobolewski, Roman Materials Science Graduate Program University of Rochester RochesterNY14627 United States Laboratory for Laser Energetics University of Rochester RochesterNY14623-1299 United States Department of Microtechnology and Nanoscience Chalmers University of Technology Gothenburg Sweden Institute of Chemical Physics University of Latvia Riga Latvia Department of Electrical and Computer Engineering University of Rochester RochesterNY14627 United States Dipartimento di Fisica "E.R. Caianiello" Università degli Studi di Salerno Sa FiscianoI-84084 Italy Lukasiewicz Research Network Institute of Microelectronics and Photonics WarszawaPL-02668 Poland

ISBN: (纸本)9781957171395

The dynamics of coherent acoustic phonons in the Bi2Se3 layered crystal system are investigated. The findings reveal that the frequency evolution of breathing modes with the number of the material quintuple layers and the dispersion relation both can be explained by a modified chain model with a nonuniform coupling force. © Optica Publishing Group 2024, © 2024 The Author(s)

关键词： Ultrathin films

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Interfacial Modification to Anomalously Facilitate Thermal Transport Through Cathode-Separator Composite in Lithium-Ion Batteries

SSRN

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SSRN 2022年

作者： He, Jinlong Xian, Weikang Tao, Lei Corrigan, Patrick Li, Ying Department of Mechanical Engineering University of Connecticut StorrsCT06269 United States Department of Mechanical Engineering Polymer Program Institute of Materials Science University of Connecticut StorrsCT06269 United States Department of Chemistry University of Connecticut StorrsCT06269 United States

Adopting the self-assembled monolayers (SAMs) approach, various organic molecules were selected as the heat controllers to modulate the interfacial thermal conductance (ITC) between the cathode, lithium cobalt oxide (LCO), and the separator, polyethylene (PE). Silane-based SAMs molecules with different groups, including -NH 2 , -SH, and -CH 3 , were assembled into the LCO-PE composite’s interphase. Through molecular dynamics (MD) simulations, our results demonstrate SAMs molecules-decorated LCO-PE nanocomposites give a notably improved interfacial heat transfer but are of different magnitude. Such difference mainly results from the different non-bonded interactions and compatibility between SAMs molecules and PE. Of the three SAMs molecules, the assembled 3-aminopropyl trimethoxysilane (APTMS) featuring –NH 2 groups improves the ITC the most, about 303.29% in comparison with the pristine interface. Furthermore, these findings help elucidate the underlying mechanisms of how SAMs molecules improve heat transfer across the LCO-PE interphase. Specifically, such enhancement is greatly attributed to the unique SAMs molecules, which build the new heat transfer pathways between LCO and PE, straighten SAMs molecules’ morphology, remove the discontinuities in the temperature field, develop the strong non-bonded interactions between SAMs molecules and PE, and strengthen the coupling vibration of two materials. © 2022, The Authors. All rights reserved.

关键词： Molecular dynamics

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Enhanced Antimicrobial and Biofilm-Disrupting Properties of Gallium-Doped Carbon Dots

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ACS Omega 2025年第25期10卷 27559-27574页

作者： Remya Radha Ahmad Fawad Sreeshna Ravindran Ganjaboy Boltaev Sachin Philip Mohammad H. Al-Sayah Department of Biology Chemistry and Environmental Sciences American University of Sharjah P.O. Box 26666 Sharjah United Arab Emirates Materials Science and Engineering Program College of Arts and Sciences American University of Sharjah P.O. Box 26666 Sharjah United Arab Emirates Materials Research Centre College of Arts and Sciences American University of Sharjah P.O. Box 26666 Sharjah United Arab Emirates Department of Applied Chemistry Cochin University of Science and Technology Kochi Kerala 682022 India Department of Biology Chemistry and Environmental Sciences American University of Sharjah P.O. Box 26666 Sharjah United Arab Emirates；Materials Science and Engineering Program College of Arts and Sciences American University of Sharjah P.O. Box 26666 Sharjah United Arab Emirates；Materials Research Centre College of Arts and Sciences American University of Sharjah P.O. Box 26666 Sharjah United Arab Emirates；Advanced Biosciences and Bioengineering Research Center American University of Sharjah P.O. Box 26666 Sharjah United Arab Emirates

Antibiotic resistance continues to be a global health threat caused by microbial biofilms, yet carbon dots (CDs) offer a promising countermeasure. Doping CDs with metals or nonmetals further enhances their properties while maintaining biocompatibility. This work reports the sonochemical synthesis of gallium–boronic acid carbon dots (Ga-BACDs) under conditions (20 kHz, 2000 W, 60% amplitude, 60 °C, and 60 min), achieving significant gallium incorporation. Ultraviolet–visible and fluorescence analyses reveal characteristic CD absorbance peaks at 286 and 355 nm and strong emission at 397–400 nm. Fourier transform infrared spectral changes on Ga-BACDs suggest successful incorporation of gallium and confirm Ga–H/Ga–O–C (2000–2600 cm–1) and Ga–O/Ga–O–Ga (400–700 cm–1) vibrations. X-ray diffraction and Raman spectroscopy data indicate the retention of the amorphous carbon framework with enhanced local ordering. High-resolution scanning electron microscopy (HR-SEM) and high-resolution transmission electron microscopy images demonstrate morphological alterations compared to BACDs with a particle mean diameter of 8.6 ± 4.1 nm. The gallium doping in Ga-BACDs was quantified as 3.66 ppm by using inductively coupled plasma–atomic emission spectroscopy. X-ray photoelectron spectroscopy results indicated that Ga is chemically integrated inside the carbon dot framework. The zeta potential shifts from −32.5 mV (BACDs) to −23.3 mV (Ga-BACDs), evidencing surface charge modulation. The antimicrobial activity of Ga-BACDs was tested against Gram-positive (Staphylococcus epidermidis) and Gram-negative (Escherichia coli) bacterial strains; the presence of gallium contributed to improved bioactivity at 37 °C. HR-SEM images of Ga-BACD-treated bacteria presented significant structural damage, membrane rupture, and surface irregularities. Ga-BACDs inhibited biofilm formation at concentrations as low as 2.5 mg/mL and efficiently eradicated preformed biofilms, highlighting their promise for preve

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