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AIAA science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Guibert, Alexandre T. R. Bookwala, Murtaza Alicia Kim, H. Structural Engineering Department University of California San Diego San DiegoCA United States Structural Engineering Department and Material Science and Engineering Department University of California San Diego San DiegoCA United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

Developing electric aircraft presents significant technical challenges, including the need for thermal management to control battery temperature and prevent catastrophic failures caused by thermal runaway. During battery discharge, heat is generated, which can lead to high temperatures and potential safety hazards. Phase-change materials (PCM) offer a potential solution by providing a high latent heat capacity, allowing them to store significant thermal energy during phase transitions. This characteristic helps slow down temperature rise and mitigate sudden temperature spikes. However, PCM’s low thermal conductivity poses a challenge, necessitating the integration of materials with higher thermal conductivity to enhance heat transfer. In this study, we use the level-set method to optimize the distribution of PCM and high thermal conductivity materials within an electric aircraft battery pack. We model the heat transfer process as an unsteady diffusion problem, incorporating PCM through the apparent heat capacity method. Using the finite element method, implemented with FEniCS, we solve for the temperature distribution at each time-step. Given the power requirements of an electric aircraft, heat generation from the batteries is predicted using the Doyle-Fuller-Newman model, a physics-based electrochemical model implemented using Py-BaMM. The optimization problem is solved with ParaLeSTO, an in-house topology optimization software written in C++ with a Python interface. Power requirements for the batteries are determined for different potential electric aircraft flights and high-energy density lithium-ion batteries, which are promising for electric aircraft, are used for the analysis. The study compares optimized designs incorporating PCM with reference designs with only PCM or only high thermal conductivity materials. This research aims to advance battery pack design using PCM for electric aircraft, contributing to improved thermal management in aerospace components

关键词： C++ (programming language)

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Chevrel phase: A review of its crystal structure and electrochemical properties

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Progress in Natural science:materials International 2023年第1期33卷 8-15页

作者： Meng Liu Guocheng Lv Tianming Liu Hao Liu Lingchang Kong Lintao Tian Wenxiu Rao Yuxin Li Libing Liao Juchen Guo Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences(Beijing) School of Science China University of Geosciences Materials Science and Engineering Program University of California-Riverside Department of Chemical and Environmental Engineering University of California – Riverside

Chevrel phase compounds have attracted increasing attention as electrochemical energy storage materials and electro-catalysts. Benefiting from their unique crystal structure, Chevrel phase compounds can not only function as the host structures for reversible intercalation of a broad range of cations, but also exhibit high catalytic activity in electrochemical reduction reactions. Here we provide an overview of recent progress in the development of Chevrel phase materials including new understanding of structural features, synthetic methods, and electrochemical properties. A brief conclusion and perspectives on the future development of Chevrel phase materials are also provided.

关键词： Chevrel phase Electrochemical properties Energy storage Electro-catalysis

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High resolution and high sensitivity imaging magnetometer with magnetic nanoparticle and optical heterodyne detection

High resolution and high sensitivity imaging magnetometer wi...

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2024 Frontiers in Optics, FiO 2024

作者： Bartos, Jan Tis, Taleb Ba Park, Wounjhang Huang, Shu-Wei Department of Electrical Computer and Energy Engineering University of Colorado Boulder80309 United States Material Science and Engineering Program University of Colorado Boulder80309 United States

We present progress towards an imaging magnetometer using a magneto-optical polymer nanocomposite thin film, experimentally demonstrating 29nT/√Hz sensitivity with © Optica Publishing Group 2024, © 2024 The... 详细信息

关键词： Heterodyne detection

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High resolution and high sensitivity imaging magnetometer with magnetic nanoparticle and optical heterodyne detection

High resolution and high sensitivity imaging magnetometer wi...

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2024 Laser science, LS 2024

作者： Bartos, Jan Ba Tis, Taleb Park, Wounjhang Huang, Shu-Wei Department of Electrical Computer and Energy Engineering University of Colorado Boulder80309 United States Material Science and Engineering Program University of Colorado Boulder80309 United States

We present progress towards an imaging magnetometer using a magneto-optical polymer nanocomposite thin film, experimentally demonstrating 29nT/√Hz sensitivity with © 2024 The Author(s). © Optica Publishing ... 详细信息

关键词： Heterodyne detection

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High-throughput design of perpendicular magnetic anisotropy at quaternary Heusler and MgO interfaces

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npj Computational materials 2023年第1期9卷 1084-1091页

作者： Sicong Jiang Kesong Yang Department of Nano and Chemical Engineering University of California San DiegoLa JollaCA 92093-0448USA Program of Materials Science and Engineering University of California San DiegoLa JollaCA 92093-0418USA Center for Memory and Recording Research University of California San DiegoLa JollaCA 92093-0401USA

Heusler alloys combined with MgO interfaces exhibit interfacial perpendicular magnetic anisotropy, making them attractive forenergy-efficient spintronic technologies. However, finding suitable Heusler/MgO heterostructures with desired properties ischallenging due to the vast range of compositions available and the complexity of interfacial structures, particularly for theemerging quaternary Heusler compounds. In this study, we report a high-throughput screening of quaternary-Heusler/MgOheterostructures for spintronic applications. By analyzing various materials descriptors, including formation energy, convex hulldistance, magnetic ordering, lattice misfit, magnetic anisotropy constant, tunnel magnetoresistance, Curie temperature, and atomicsite disordering, we identified 5 promising compounds out of 27,000 quaternary Heusler compounds. These compounds, namelyIrCrAlTi, IrCrGaTi, IrMnZnTi, OsCrAlTa, and TaGaOsCr, show potential for designing energy-efficient perpendicular magnetic tunneljunctions. This work demonstrates an efficient approach using open quantum materials repositories, effective materials descriptors,and high-throughput computational techniques to accelerate the discovery of quaternary-Heusler-based functional materials.

关键词： quaternary anisotropy magnetic

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Direct Multi-group Cross-sections via NJOY+OJOYU for PWR and FLiBe-MSR Reactor Systems

Direct Multi-group Cross-sections via NJOY+OJOYU for PWR and...

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2023 Transactions of the American Nuclear Society Annual Meeting and Technology Expo, ANS 2023

作者： Wang, Meng-Jen Simpson, Michael Sjoden, Glenn E. Nuclear Engineering Program Department of Civil and Environmental Engineering University of Utah United States Department of Material Science and Engineering University of Utah United States

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Goldilocks Energy Minimum: Peptide-Based Reversible Aggregation and Biosensing (Vol 15, Pg 42293, 2023)

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ACS APPLIED materialS & INTERFACES 2023年第41期15卷 48838-48838页

作者： Yim, Wonjun Retout, Maurice Chen, Amanda A. Ling, Chuxuan Amer, Lubna Jin, Zhicheng Chang, Yu-Ci Chavez, Saul Barrios, Karen Lam, Benjamin Li, Zhi Zhou, Jiajing Shi, Lingyan Pascal, Tod A. Jokerst, Jesse V. Materials Science and Engineering Program University of California San Diego La Jolla California 92093 United States Department of Nano and Chemical Engineering University of California San Diego La Jolla California 92093 United States Shu Chien-Gene Lay Department of Bioengineering University of California San Diego La Jolla California 92093 United States Department of Radiology University of California San Diego La Jolla California 92093 United States

Colorimetric biosensors based on gold nanoparticle (AuNP) aggregation are often challenged by matrix interference in biofluids, poor specificity, and limited utility with clinical samples. Here, we propose a peptide-driven nanoscale disassembly approach, where AuNP aggregates induced by electrostatic attractions are dissociated in response to proteolytic cleavage. Initially, citrate-coated AuNPs were assembled via a short cationic peptide (RRK) and characterized by experiments and simulations. The dissociation peptides were then used to reversibly dissociate the AuNP aggregates as a function of target protease detection, i.e., main protease (Mpro), a biomarker for severe acute respiratory syndrome coronavirus 2. The dissociation propensity depends on peptide length, hydrophilicity, charge, and ligand architecture. Finally, our dissociation strategy provides a rapid and distinct optical signal through Mpro cleavage with a detection limit of 12.3 nM in saliva. Our dissociation peptide effectively dissociates plasmonic assemblies in diverse matrices including 100% human saliva, urine, plasma, and seawater, as well as other types of plasmonic nanoparticles such as silver. Our peptide-enabled dissociation platform provides a simple, matrix-insensitive, and versatile method for protease sensing.

关键词： colorimetric biosensor DLVO theory reversible aggregation dissociation peptide matrix-insensitive SARS-CoV-19

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Rechargeable Multivalent-Ion Batteries

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Energy material Advances 2024年第1期5卷 283-284页

作者： Juchen Guo Jennifer LSchaefer Yuyan Shao Department of Chemical and Environmental Engineering Materials Science and Engineering ProgramUniversity of CaliforniaRiversideRiversideCA 92521USA Department of Chemical and Biomolecular Engineering University of Notre DameNotre DameIN 46556USA Pacific Northwest National Laboratory RichlandWA 99352USA

Rechargeable batteries based on multivalent metal anodes including earth-abundant magnesium(Mg),calcium(Ca),zinc(Zn),and aluminum(Al)are potential new“beyond lithium(Li)”electrochemical energy storage technologies for large-scale energy storage *** multivalent elements are more earth abundant,and therefore promising candidates for reducing global dependence on Li for our growing energy storage *** the seminal work by Aurbach and coworkers[1]demonstrating the first prototype rechargeable Mg batteries,tremendous efforts have been made to the research and development of rechargeable multivalent-ion batteries.

关键词： energy storage calcium batteries rechargeable batteries multivalent elements multivalent metal anodes energy storage technologies magnesium batteries

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Single plasmonic exceptional point nanoantenna coupled to a photonic integrated circuit sensor

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Photonics Research 2025年第3期13卷 632-641页

作者： KAMYAR BEHROUZI ZHANNI WU LIWEI LIN BOUBACAR KANTE Department of Mechanical Engineering University of California BerkeleyBerkeleyCalifornia 94720USA Berkeley Sensor and Actuator Center(BSAC) BerkeleyCalifornia 94720USA Department of Electrical Engineering and Computer Science University of California BerkeleyBerkeleyCalifornia 94720USA Material Science Division Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA

Point-of-care sensors are pivotal for early disease diagnosis,significantly advancing global *** plasmons,the collective oscillations of free electrons under electromagnetic excitation,have been widely studied for biosensing due to their electromagnetic field enhancements at sub-wavelength *** introduce a plasmonic biosensor on a compact photonic integrated circuit(PIC)enhanced by exceptional points(EPs).EPs,singularities in non-Hermitian optical systems,provide extreme sensitivity to external *** emerge when two or more complex resonating modes merge into a single degenerate *** demonstrate an EP in a single coupled nanoantenna particle positioned in a uniquely designed silicon nitride slot-waveguide,which we call a *** laterally shifting two optically coupled gold nanobars of different lengths,we achieve a single particle *** junction-waveguide enables efficient coupling of the plasmonic nanoantenna to the waveguide *** system integrates a four-port Mach-Zehnder interferometer(MZI),allowing for simultaneous measurements of the amplitude and phase of EP,facilitating highly accurate real-time eigenvalue *** biosensing,we encapsulated the detection zone with a microchannel,enabling low-volume and simple sample *** single particle integrated EP sensor demonstrates superior sensitivity compared to the corresponding linear diabolic point(DP)system under both local and bulk sensing schemes,even at large *** studies revealed that the integrated EP sensor can detect a single molecule captured by the nanobars with the average size ranging from 10 to 100 *** proposed EP biosensor,with its extreme sensitivity,compact form,and real-time phase sensing capabilities,provides an approach for detecting and quantifying various biomarkers such as proteins and nucleic acids,offering a unique platform for early disease diagnosis.

关键词： electromagnetic field enhancements photonic integrated circuit plasmonic biosensor collective oscillations free electrons biosensor surface plasmons plasmonic exceptional point compact photonic integrated circuit pic enhanced

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Cationization of Cellulose Dissolved in TEAOH/urea Solvent and its Preparation of Cellulose Beads: Effect of Added Amount of GTAC

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2022年第6期54卷 85-93页

作者： Kim, Younglae Jang, Minseok Cho, Byoung-Uk Department of Paper Science & Engineering College of Forest and Environmental Science Kangwon National University Korea Republic of Program of Paper Material Science & Engineering College of Forest and Environmental Science Kangwon National University Korea Republic of

To widen the applications, cationic cellulose beads were synthesized by adding glycidyltrimethylammonium chloride (GTAC) to cellulose fibers dissolved in a mixture of tetraethylammonium hydroxide and urea at room temperature for cationic modification, and dropping the cationic cellulose solution into an acetic acid solution. Herein, the effects of the added GTAC amount on the properties of cationic cellulose soultion and cellulose beads were investigated. It was observed that increasing the amount of GTAC increased the viscosity and surface tension of the cationically modified cellulose solution and increased the particle size of the cellulose beads. Furthermore, the zeta potential of the cellulose beads can be controlled by modifying the GTAC amount. © 2022 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Chemical modification

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