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SSRN 2022年

作者： Zhou, Dongyan Cai, Shaoyong Sun, Haoyang Zhong, Gansheng Zhang, He Sun, Dazhi Su, Fengyu Deng, Mengyu Tian, Yanqing Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen518055 China School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen518055 China Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Shenzhen518055 China

Dissolved oxygen (DO) sensors for the practical application usually require good resistance to complex and extreme environments , such as acidic or alkaline corrosion, seawater sediment erosion, protein or bacteria adhesion, etc. Diatom frustules (DFs) are protective shell structures extracted from diatoms, which have delicate hierarchical pores and a large specific surface area, showing their utilization potential as oxygen sensing materials. Herein, we developed a superhydrophobic DO sensor which use the DFs as supporting materials. The sensor was fabricated by spraying the mixture of 1H,1H,2H,2H-perfluorooctyltriethoxysilane (PFOTS) modified DFs and oxygen-sensitive probe platinum (II)-5,10,15,20-tetrakis-(2,3,4,5,6-pentafluorophenyl)-porphyrin (PtTFPP) on the bonding substrate. In the DO sensor, DFs provides a tough micro/nano surface structures and PFOTS offers low surface energy, both of which led to a robust superhydrophobic surface of the sensor. Because of the porous structure of DFs and the diffusion enhancement effect of fluorine on oxygen, the sensor has high DO sensitivity, I 0 /I 100 which represents for oxygen sensitivity reaches up to 129. Additionally, the sensor showed good tolerance on mechanical abrasion, acidic or alkaline corrosion and biofouling. Owing to these good performances, the use of DFs is expected to provide a new strategy for the rational design of high performance DO sensing devices. © 2022, The Authors. All rights reserved.

关键词： Dissolved oxygen

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Enhancement of effluent degradation by zinc oxide, carbon nitride, and carbon xerogel trifecta on brass monoliths

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Environmental science and Pollution Research 2024年第40期31卷 53472-53496页

作者： da Silva, Émerson Felipe Mendonça Garcia, Ramón Raudel Peña Rodrigues, Liana Alvares Napoleão, Daniella Carla Sanz, Oihane Almeida, Luciano Costa Department of Chemical Engineering Technology and Geoscience Center Federal University of Pernambuco PE Recife50740-521 Brazil Pós Graduate Program in Materials Science and Engineering Federal University of Piauí PI Teresina64049-550 Brazil Academic Unit of Cabo de Santo Agostinho Federal Rural University of Pernambuco PE Cabo de Santo Agostinho54518-430 Brazil Dept. of Applied Chemistry Chemistry Faculty University of the Basque Country UPV/EHU P. Lardizabala 3 San Sebastian20018 Spain Escola de Engenharia de Lorena EEL/USP Estrada Municipal Do Campinho S/N São Paulo LorenaCEP 12602-810 Brazil

In recent years, heterogeneous photocatalysis has emerged as a promising alternative for the treatment of organic pollutants. This technique offers several advantages, such as low cost and ease of operation. However, finding a semiconductor material that is both operationally viable and highly active under solar irradiation remains a challenge, often requiring materials of nanometric size. Furthermore, in many processes, photocatalysts are suspended in the solution, requiring additional steps to remove them. This can render the technique economically unviable, especially for nanosized catalysts. This work demonstrated the feasibility of using a structured photocatalyst (ZnO, g-C3N4, and carbon xerogel) optimized for this photodegradation process. The synthesized materials were characterized by nitrogen adsorption and desorption, X-ray diffraction (XRD), and diffuse reflectance spectroscopy (DRS). Adhesion testing demonstrated the efficiency of the deposition technique, with film adhesion exceeding 90%. The photocatalytic evaluation was performed using a mixture of three textile dyes in a recycle photoreactor, varying pH (4.7 and 10), recycle flow rate (2, 4, and 6 L h−1), immobilized mass (1, 2, and 3 mg cm−2), monolith height (1.5, 3.0, and 4.5 cm), and type of radiation (solar and visible artificials;and natural solar). The structured photocatalyst degraded over 99% of the dye mixture under artificial radiation. The solar energy results are highly promising, achieving a degradation efficiency of approximately 74%. Furthermore, it was possible to regenerate the structured photocatalyst up to seven consecutive times using exclusively natural solar light and maintain a degradation rate of around 70%. These results reinforce the feasibility and potential application of this system in photocatalytic reactions, highlighting its effectiveness and sustainability. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Heterojunctions

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Direct-Write NiO RRAM Cells

Direct-Write NiO RRAM Cells

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Electronic Components and Technology Conference (ECTC)

作者： Jordan Howard-Jennings Riadh Al-Haidari Emuobosan Enakerakpo Abdullah Obeidat Kevin Bell Tom Rovere Stephen Gonya Mohammed Alhendi Mark Poliks Materials Science & Engineering Program Binghamton University Binghamton NY United States Department of Systems Science & Industrial Engineering Binghamton University Binghamton NY United States Lockheed Martin Rotary and Mission Systems Lockheed Martin Corporation Owego NY United States The Center for Advanced Microelectronics Manufacturing Binghamton University Binghamton NY United States

ISBN: (数字)9798350375985

ISBN: (纸本)9798350375992

As electronic devices and their internal components have become more advanced, conventional computer memory technologies – which are a key component of all electronics – have struggled to fully keep up with this advancement. Meeting the demands of computer memory in modern electronics requires a zero-sum game approach of optimizing several, often competing performance benchmark criteria. Resistive random-access memory (RRAM) is an emerging nonvolatile memory (NVM) technology with great appeal due to its ease of fabrication, low programming voltage, fast read/write times, compatibility with existing CMOS platforms, and demonstrated scalability into tiny dimensions thus enabling a higher density and smaller footprint. We fabricated NiO-based RRAM cells using aerosol jet printing to investigate the performance of direct-writing as an alternative method for RRAM cell fabrication compared to conventional techniques (e.g. sputtering, layer deposition, etc.). A fabricated NiO-based RRAM cell, with a NiO layer thickness of 0.426 μm and a cell area of 0.154 mm 2 , demonstrated a clearly separated high and low resistance state when a dual voltage sweep was applied across the two cell electrode terminals. Preliminary results show that NiO-RRAM aerosol jet printed cells can exhibit resistive switching, indicating that direct write methods can be used to fabricate many cells per batch with material layer thicknesses that, while thicker than what can be achieved using conventional techniques, are just as functional.

关键词： Fabrication Electrodes Scanning electron microscopy Temperature distribution Nonvolatile memory Voltage Switches

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arXiv

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arXiv 2024年

作者： Zeng, Xianlong Gao, Yijing Liu, Ang Song, Fanghao Electrical Engineering and Computer Science Ohio University AthensOH45701 United States Data Science Institute Brown University ProvidenceRI02912 United States Global Urban Studies Program Rutgers University New BrunswickNJ08901 United States

This study introduces a simple yet effective method for identifying similar data points across non-free text domains, such as tabular and image data, using Large Language Models (LLMs). Our two-step approach involves data point summarization and hidden state extraction. Initially, data is condensed via summarization using an LLM, reducing complexity and highlighting essential information in sentences. Subsequently, the summarization sentences are fed through another LLM to extract hidden states, serving as compact, feature-rich representations. This approach leverages the advanced comprehension and generative capabilities of LLMs, offering a scalable and efficient strategy for similarity identification across diverse datasets. We demonstrate the effectiveness of our method in identifying similar data points on multiple datasets. Additionally, our approach enables non-technical domain experts, such as fraud investigators or marketing operators, to quickly identify similar data points tailored to specific scenarios, demonstrating its utility in practical applications. In general, our results open new avenues for leveraging LLMs in data analysis across various domains. © 2024, CC BY.

关键词： Adversarial machine learning

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Reducing anisotropy of rhombohedral Bi-rich phase for high-performance Ag-alloyed Sn–Bi low-temperature solders

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Journal of materials Research and Technology 2024年 30卷 16-24页

作者： Yang, Chih-han Liu, Yu-chen Nishikawa, Hiroshi Lin, Shih-kang Department of Materials Science and Engineering National Cheng Kung University Tainan70101 Taiwan Joining and Welding Research Institute Osaka University 11-1 Mihogaoka Ibaraki Osaka567-0047 Japan Research Center National Cheng Kung University Tainan70101 Taiwan Program on Smart and Sustainable Manufacturing Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan70101 Taiwan Core Facility Center National Cheng Kung University Tainan70101 Taiwan

The rhombohedral structure is with anisotropic properties, leading to brittle mechanical properties. However, it is one of the major constituent phases, the (Bi) phase, in the Sn–Bi-based low-temperature solders, which is demanding in the electronic industry for reducing the soldering temperature and alleviating the warpage in high-density fine-pitch electronic packaging. Herein, we proposed a high-performance Ag-alloyed Sn–Bi (SBA) low-temperature solder by reducing the fraction and, more importantly, the anisotropy of the (Bi) phase. We found that the (Bi) phase exhibited considerable solubility for Ag and Sn, even after thermal aging, without any nanoprecipitates as confirmed with both CALPHAD-type thermodynamic modeling and high-resolution TEM. The solution effects of Ag and Sn in the (Bi) phase is elaborated based on in situ nano-indentation, EPMA compositional analyses, EBSD characterizations, and ab initio calculations. The presence of Ag and Sn in the (Bi) phases resulted in both solid solution hardening and softening effects, depending on the Schmid factor of the grain. As a result, in (Bi) polycrystals, alloying could effectively mitigate the anisotropic mechanical properties of the (Bi) phase and facilitated a more uniform dispersion of forces exerted among (Bi) grains in all orientations. Consequently, the designed SBA solder exhibited superior mechanical properties, e.g., an ultimate tensile strength (UTS) of 55 MPa, elongation of 46%, and toughness of 20.6 × 106 J/m3 at a strain rate of 0.0005 s−1. This understanding opens the door for enhanced rhombohedral phase in alloy design for various applications. © 2024 The Authors

关键词： Anisotropy

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Grain Boundary Segregation Models for High-Entropy Alloys: Theoretical Formulation and Derived Analytical Expressions to Elucidate High-Entropy Grain Boundaries

arXiv

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arXiv 2024年

作者： Luo, Jian Department of NanoEngineering University of California La Jolla San DiegoCA92093 United States Program in Materials Science and Engineering University of California La Jolla San DiegoCA92093 United States

Grain boundary (GB) segregation models are derived for multi-principal element and high-entropy alloys (MPEAs and HEAs). Differing from classical models where one component is taken as solvent and others are considered solutes, these models are referenced to the bulk composition to enable improved treatments of MPEAs and HEAs with no principal components. An ideal solution model is first formulated and solved to obtain analytical expressions that predict GB segregation and GB energy in MPEAs and HEAs. A regular solution model is further derived. The GB composition calculated using the simple analytical expression derived in this study and data from the materials Project agree well with a prior sphosipcated atomistic simulation for NbMoTaW. The simplicity of the derived analytical expressions makes them useful for not only conveniently predicting GB segregation trends in HEAs, but also analyzing nascent interfacial phenomena in composionally complex GBs. As an application example, the derived models are used to further formulate a set of useful equations to elucidate an emergent concept of high-entropy grain boundaries (HEGBs). © 2024, CC BY.

关键词： Entropy

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Packing fraction related transport in disordered quantum dot arrays

arXiv

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arXiv 2024年

作者： Eshraghi, K. Natani, S. Bandaru, P. Program in Materials Science University of California La Jolla San DiegoCA92093 United States Department of Mechanical Engineering University of California La Jolla San DiegoCA92093 United States

Models to describe electrical conduction in quantum dot (QD) constituted films often overlook the effects of geometric disorder. We address related issues by examining the influence of the QD packing fraction (PF) on the charge transport and transmission in QD arrays. Using transfer matrix based algorithms and Monte Carlo simulations, we quantify the transmission across disordered QD assemblies. Our results indicate a critical packing fraction (PFc) of ∼ 0.64, marking a transition from a non-conducting to a conducting state, aligning well with experimental observations and analytical predictions. This study enhances the understanding of transport in QD arrays, with implications for designing efficient electronic devices based on disordered nanoscale systems. © 2024, CC BY-NC-SA.

关键词： Semiconductor quantum dots

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Enhanced efficiency and stability in Sn-based perovskite solar cells with secondary crystallization growth

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Journal of Energy Chemistry 2021年第3期30卷 414-421页

作者： Zhixin Jin Bin-Bin Yu Min Liao Di Liu Jingwei Xiu Zheng Zhang Efrat Lifshitz Jiang Tang Haisheng Song Zhubing He Department of Materials Science and Engineering Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation(FSSEG)Southern University of Science and TechnologyNo.1088Xueyuan Rd.Shenzhen 518055GuangdongChina Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyLuoyu Road 1037Wuhan 430074HubeiChina Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055GuangdongChina Schulich Faculty of Chemistry Russell Berrie Nanotechnology Institute Solid State InstituteTechnion Haifa32000Israel

The conversion efficiencies reported for Tin(Sn)halide-based perovskite solar cells(PSCs)fall a large gap behind those of lead halide-based PSCs,mainly because of poor film quality of the *** we report an efficient strategy based on a simple secondary crystallization growth(SCG)technique to improve film quality for tin halide-based PSCs by applying a series of functional amine chlorides on the perovskite *** were discovered to enhance the film crystallinity and suppress the oxidation of Sn^(2+)remarkably,hence reduce trap state density and non-irradiative recombination in the absorber ***,the SCG film holds the band levels matching better with carrier transport layers and herein favoring charge extraction at the device ***,a champion device efficiency of 8.07% was achieved alo ng with significant enhancements in VOC and JSC,in contrast to 5.35% of the control device ***,the SCG film-based devices also exhibit superior stability comparing with the control *** work explicitly paves a novel and general strategy for developing high performance lead-free PSCs.

关键词： Tin based perovskite solar cells Secondary crystallization growth Amine chloride Non-irradiative recombination Energy band levels matching

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Dispersion of cobalt ferrite functionalized graphene nanoplatelets in PLA for EMI shielding applications 36

Dispersion of cobalt ferrite functionalized graphene nanopla...

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36th Technical Conference of the American Society for Composites 2021: Composites Ingenuity Taking on Challenges in Environment-Energy-Economy, ASC 2021

作者： Anurakparadorn, Kanat Taub, Alan Michielssen, Eric Department of Materials Science and Engineering Macromolecular Science and Engineering Program University of Michigan 2300 Hayward St Ann ArborMI48109 United States Department of Mechanical Engineering University of Michigan 2350 Hayward St Ann ArborMI48109 United States Department of Electrical Engineering and Computer Science University of Michigan 1310 Beal Ave Ann ArborMI48109 United States

ISBN: (纸本)9781713837596

The proliferation of wireless technology calls for the development of cost-effective Electromagnetic Interference (EMI) shielding materials that reduce the susceptibility of high-speed electronic circuits to undesired incoming radiation. Ideally, such materials offer protection over wide frequency ranges and are insensitive to the polarization or angle of incidence of the impinging fields. Here, next-generation EMI shielding materials composed of polymer composites with conductive and magnetic fillers are introduced. It is shown that careful control of the concentration and dispersion of the polymers’ conductive and magnetic constituents permits tuning of the composites’ intrinsic electrical and magnetic properties. The resulting EMI shields are lightweight, cheap and offer greater protection than traditional metal gaskets and foams. In this work, cobalt ferrite magnetic nanoparticles (CoFe2O4) decorated on graphene-based material were dispersed in polylactic acid (PLA) matrix for high EM absorption level in X-band (8-12 GHz). The decoration of the magnetic particles was performed on the as-prepared conductive graphene nanoplatelets (GNP) and reduced graphene oxide (rGO). GNP composites exhibited higher DC conductivity, and permittivity than rGO composites. This is attributed to issues associated with the reduction process, including a lack of conductivity due to the insulated oxygen functional groups and the reduction in the lateral size. Compared with rGOs, the lack of out-plane functional groups causes the cobalt ferrite nanoparticles to agglomerate and not cover the entire surface of the GNPs. These morphological differences improve the magnetization and EM absorption of the composite system. The compatibilizer (pyrene-PLA-OH) was added to the composites to enhance dispersion of the GNPs in the polymer matrix which benefits in higher absorption of the shield. The influence of the compatibilizer on parameter, the reflection loss (RL) of the composite were determi

关键词： Cost effectiveness

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Assessing the Impact of Natural Ventilation on Indoor Environmental Quality in an Energy-Efficient Building 17

Assessing the Impact of Natural Ventilation on Indoor Enviro...

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17th International Conference on Indoor Air Quality and Climate, INDOOR AIR 2022

作者： Alhindawi, Ibrahim Byrne, Miriam A. Sood, Divyanshu O'Donnell, James McGrath, James A. Physics Unit School of Natural Science The Ryan Institute's Centre for Climate and Air Pollution Studies National University of Ireland Galway Galway Ireland School of Mechanical & Materials Engineering UCD Energy Institute University College Dublin Dublin Ireland

This research aims at assessing the capability of natural ventilation to maintain indoor environmental quality (IEQ) within Irish dwellings, as part of an ongoing longitudinal study that targets monitoring a spectrum of energy-efficient naturally-ventilated residential buildings in Galway and Dublin, during summer and winter periods, while monitoring energy consumption mutually. This study utilises a combination of remotely-operated 'low-cost' sensors and high-grade research instrumentation to collect measurements of key indoor pollutants and thermal parameters. © 2022 17th International Conference on Indoor Air Quality and Climate, INDOOR AIR 2022. All rights reserved.

关键词： Energy utilization

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