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SSRN 2024年

作者： Alves, Cleidson Rosa Muller, Anderson Augusto Dal-Bó, Alexandre Gonçalves Bernandin, Adriano Michael Civil Engineering Department Federal Institute of Santa Catarina Santa Catarina Criciúma Brazil Graduate Program in Materials Science and Engineering University of the Extreme South of Santa Catarina Santa Catarina Criciúma Brazil Ceramic Materials Group United States

Lightweight geopolymers have the potential for innovative applications, such as low thermal conductivity material, pH regulator, adsorbent material, and lightweight concrete. However, these materials are often fragile due to their high porosity. In this study, the combined effect of sodium dodecyl sulfate (SDS) with hydrogen peroxide (H2O2) in the pore formation of a geopolymeric mortar reinforced with glass fiber and polypropylene fibers was investigated. The aim was to improve the distribution and morphology of pores, resulting in lower thermal conductivity. Lightweight mortars were produced using metakaolin, alkaline activators, and standardized sand. The innovation in this study lies in the incorporation of fibers as reinforcement in lightweight geopolymers and the microstructural changes resulting from the combination of the pore-forming agent (H2O2) with surfactant (SDS). The microstructural evolution in the fresh state, and density, porosity, and thermal conductivity in the hardened state were evaluated. As a result, the combined use of reinforcement fibers and control of pore volume is effective in the control of the microstructure of the mortar and, as a consequence, its thermal conductivity. SDS significantly contributes to foam stabilization, leading to improvements in thermal conductivity (0.15 W/m.K), Bulk density (1000 kg/m3), and a reduction in the average pore size. This suggests that these materials can be used for both thermal insulation and the construction of lightweight structural walls. © 2024, The Authors. All rights reserved.

关键词： Thermal insulation

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Thermal-Protective and Oxygen-Resistant Nanocoating Using Silica-Nanocomposites for Laser Thinning of Polymorphic Molybdenum Ditellurides

SSRN

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SSRN 2023年

作者： Heo, Soyoung Kim, Seulbi Lee, Seung Yeon Yang, Heejun Park, Ji Hun Cho, Suyeon Division of Chemical Engineering and Materials Science Graduate Program in System Health Science and Engineering Ewha Womans University Seoul03760 Korea Republic of Department of Science Education Ewha Womans University Seoul03760 Korea Republic of Daejeon34141 Korea Republic of

Laser irradiation has been investigated as a method of fabricating atomically-thin crystals from layered two-dimensional (2D) materials with precise thickness control. However, during laser irradiation, inevitable structural changes can occur in the 2D materials due to the high thermal energy, altering their physical and chemical properties and introducing disorder, which has hindered the study and use of the intrinsic properties of atomically-thin materials. In this study, we report a laser thinning method using a new coating material, a layered silica-based nanocomposite (SNC), that preserves the pristine crystal structure of a polymorphic 2D material, MoTe2, down to an atomically thin geometry. The nano-porous coating of layered silica-based nanocomposite (SNC) was robust against thermal heating and behaved as a good thermal-protective and oxygen-resistant material in the laser thinning process. Therefore, the SNC-coated MoTe2 flakes were successfully thinned down to atomically-thin geometry, while preserving their 2H structure. Accordingly, our SNC coating of 2D materials is a promising way to engineer the phase and geometry of polymorphic 2D materials, enabling versatile applications in various optoelectronic, spintronic, and electronic devices. © 2023, The Authors. All rights reserved.

关键词： Coatings

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Increasing risk of oppressive heatwaves over India in the future warming

arXiv

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arXiv 2025年

作者： Sudharsan, Naveen Singh, Jitendra Ghosh, Subimal Karmakar, Subhankar Environmental Science and Engineering Department Indian Institute of Technology Maharashtra Bombay India Department of Environmental Systems Science ETH Zürich Zürich Switzerland Department of Civil Engineering Indian Institute of Technology Maharashtra Bombay India Interdisciplinary Program in Climate Studies Indian Institute of Technology Maharashtra Bombay India Centre for Urban Science & Engineering Indian Institute of Technology Maharashtra Bombay India

The frequency of heatwave events has been increasing with climate change across the globe, causing devastating impacts on human and natural systems. Particularly, the co-occurrence of high temperature with high humidity has the potential of worse impacts on human health than extreme temperature alone. We use observations to examine the characteristics of extreme (high temperature and low humidity) and oppressive (high temperature and high humidity) heatwaves and their impacts on human mortality. We also use climate model simulations to understand the likelihood of heatwaves under varied warming conditions in future climates. We find an increasing trend in the number of days of extreme and oppressive heatwaves, with surprisingly a higher rate of increase in oppressive heatwaves. We also observe a higher correlation between oppressive heatwaves and historical heat-stress-related human deaths than extreme heatwaves, indicating more substantial impacts of oppressive heatwaves on the human population than extreme heatwaves. Further, our results show a five-fold increase in the number of days of oppressive heatwaves under 1.5°warming in both mid (2035-2065) and end (2070- 2100) of the 21st century, relative to the historical period (1975 to 2005) whereas the number of extreme heatwave days remains relatively constant in mid and end of this century. Remarkably, 2°warming results in an eight-fold and almost two-fold increase in the number of days of oppressive heatwaves by the end of the century relative to the historical period and 1.5°warming conditions. These results suggest that limiting the mean global warming to 1.5°can reduce the likelihood of oppressive and extreme heatwaves by 44% and 25% by the end of the century relative to the 2°warming world. Moreover, the remarkable increase in oppressive heatwave days highlights the elevated risk of heatwaves over densely populated countries and indicates an imminent need for adaptation measures. © 2025, CC BY.

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Co Metal ALD on Cu with Cyclic Clean by Peroxide and Hydrazine for Inverse Hybrid Metal Bonding

Co Metal ALD on Cu with Cyclic Clean by Peroxide and Hydrazi...

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Technology, Systems and Applications (VLSI-TSA/VLSI-DAT), International VLSI Symposium on

作者： Cheng-Hsuan Kuo Dipayan Pal Victor Wang Madison Manley Rohan Sahay Ravindra Kanjolia Mansour Moinpour Jacob Woodruff Bakir Muhannad Jeff Spiegelman Andrew C. Kummel Materials Science and Engineering Program University of California San Diego Department of Chemistry and Biochemistry University of California San Diego Georgia Institute of Technology EMD Electronics Rasirc

ISBN: (数字)9798350360349

ISBN: (纸本)9798350360356

To meet the demands of data-intensive applications such as artificial intelligence (AI) and high-performance computing (HPC), there is a need for tighter integration to minimize electrical interconnect delays and energy [1] . Typical I/O pitches for μ-bumps range from hundreds of microns to $\sim 50\mu \mathrm{m}$ for conventional flip chip bonding therefore limiting the number of I/O's. When scaling down solder-based μ-bumps, adjacent interconnects could be shorted during the bonding process. As a result, the investigation of new bonding techniques has become more and more popular. The feasibility of a 3D bonding technology for ultra-dense input/output (I/O) interconnects using cobalt selective atomic layer deposition (Co ALD) was explored with a preliminary testbed [2] .

关键词： Micrometers Three-dimensional displays Limiting High performance computing Very large scale integration Delays Flip-chip devices

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A Data-driven Framework to Accelerate the Discovery of Hybrid Cathode materials for Metal-based Batteries

arXiv

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arXiv 2024年

作者： Biby, Ahmed H. Rich, Benjamin S. Musgrave, Charles B. Materials Science and Engineering Program University of Colorado Boulder BoulderCO80309 United States Department of Chemistry University of Colorado Boulder BoulderCO80309 United States Department of Chemical Engineering University of Utah Salt Lake CityUT84112 United States Department of Materials Science and Engineering University of Utah Salt Lake CityUT84112 United States

Selecting materials for hybrid cathodes for batteries, which involve a combination of intercalation and conversion materials, has gained interest due to their combined synergistic and compromised properties that are not attainable by their homogeneous counterparts. Herein, we present a data-driven, chemistry-agnostic, and inverse material design framework for discovering hybrid cathode materials (HCMs) for metal-based batteries. This framework systematically explores the potential materials space for any given working ion, evaluates the candidate’s stability, and identifies the growth modes/adsorption of the components for a stable hybrid cathode. To demonstrate the application of the framework and its various possible outcomes, we performed a case study, for which the main design objective was to discover HCMs with an average gravimetric energy density surpassing that of the widely used high energy density NMC333 cathode material. The framework identified LiCr4GaS8-Li2S as a promising HCM that achieves an average energy density of 1,424 Wh/kg (on a lithiated cathode basis) that exceeds NMC333’s maximum theoretical energy density of 1,028 Wh/kg. The identified material has several additional desirable features: 1) possession of thermodynamically stable lithiated and delithiated intercalation and conversion phases;2) minimal volume change, upon (de)lithiation, that mitigates the high-volume change of the conversion material;3) high energy density that ameliorates the low energy density of the intercalation material;4) ability of the intercalation component to act as both a conductive additive and immobilizer of S, while simultaneously contributing to the total cathode energy density;5) the intercalation material serves as an ideal support for the soft sulfur species and finally, 6) we anticipate that the life span, self-discharge, mechanical integrity, and capacity fading are better than those of conventional Li-S batteries. The developed framework was instrumental f

关键词： Lithium compounds

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Privacy Preserving Electronic Health Record with Consortium Blockchain 6

Privacy Preserving Electronic Health Record with Consortium ...

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6th International Conference on Information Technology, Information Systems and Electrical engineering, ICITISEE 2022

作者： Gautama, Adri Rochim, Adian Fatchur Bayuaji, Luhur Doctoral Program of Information System School of Postgraduate Studies Diponegoro University Semarang Indonesia Diponegoro University Department of Computer Engineering Semarang Indonesia Computer Science Budi Luhur University Jakarta Indonesia

ISBN: (纸本)9798350399615

Every patient has health record, it was written as statement of patient's conditions, treatments, and medications, and nowadays it is become digitalized, it can be copied and shared easily, but the nature of EHR is private, not for public, private between patients and healthcare provider. Privacy preserving can be done by implementing Blockchain network for storing EHR, only authorized users or nodes can access and write data to the network. New block in blockchain created as per consensus among nodes, every node can join a blockchain network if it is public, to meet a consensus required resources intensive cryptographic challenge, in private blockchain, only selected can join and involved in the network or specific transaction. In healthcare, data privacy is the main concerned, need a secure, scalable, and efficient blockchain hence implementing consortium blockchain is perfect match for EHR where multiple healthcare provider can operate in a single platform to conduct transaction or sharing EHR among members. This study analyzes 15 articles derived from IEEE Explore, science Direct and Scopus by implementing screening with keyword Consortium Blockchain and EHR and proposing new blockchain model accommodating solution for challenges on access, storage, sharing, privacy, and performance. © 2022 IEEE.

关键词： Consortium Blockchain e-health EHR Privacy

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CsPbBr3 perovskite quantum-dot paper exhibiting a highest 3 dB bandwidth and realizing a flexible white-light system for visible-light communication

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Photonics Research 2021年第12期9卷 2341-2350页

作者： KONTHOUJAM JAMES SINGH XIAOTONG FAN ANNADA SANKAR SADHU CHUN-HO LIN FANG-JYUN LIOU TINGZHU WU YU-JUNG LU JR-HAU HE ZHONG CHEN TOM WU HAO-CHUNG KUO Department of Photonics&Institute of Electro-Optical Engineering College of Electrical and Computer EngineeringNational Yang Ming Chiao Tung UniversityHsinchu 30010Taiwan International Ph.D.Program in Photonics(UST) College of Electrical and Computer EngineeringNational Yang Ming Chiao Tung UniversityHsinchu 30010Taiwan Department of Electronic Science Fujian Engineering Research Center for Solid-State LightingXiamen UniversityXiamen 361005China School of Materials Science and Engineering University of New South WalesSydneyNSW 2052Australia Research Center for Applied Sciences Academia SinicaTaipei 11529Taiwan Department of Materials Science and Engineering City University of Hong KongKowloon TongHong KongChina

We propose a flexible white-light system for high-speed visible-light communication(VLC)applications,which consists of a semipolar blue InGaN/GaN single-quantum-well micro-light-emitting diode(LED)on a flexible substrate pumping green CsPbBr3 perovskite quantum-dot(PQD)paper in nanostructure form and red CdSe QD *** highest bandwidth for CsPbBr3 PQD paper,229 MHz,is achieved with a blue micro-LED pumping source and a high data transmission rate of 400 Mbps;this is very promising for VLC *** 817 MHz maximum bandwidth and a 1.5 Gbps transmission speed are attained by the proposed semipolar blue *** proposed flexible white light system and the high-bandwidth PQD paper could pave the way for VLC wearable devices.

关键词： pumping communication quantum

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The Feather Structure and Bioinspired Rachis Design

SSRN

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SSRN 2024年

作者： Velasco-Hogan, Audrey Tavares, Sheron S. Lazarus, Benjamin Mahrous, Mahmoud A. Jasiuk, Iwona Meyers, Marc Andre Materials Science and Engineering Program University of California San Diego United States Department of Civil and Environmental Engineering University of Illinois at Urbana-Champaign UrbanaIL United States Mechanical Science and Engineering Department University of Illinois at Urbana-Champaign United States Depts. Of Nanoengineering and Mechanical and Aerospace Engineering University of California San Diego United States

The feather structure is comprised of a central shaft, lateral barbs and a network of barbules connecting them. These three components act synergistically to provide lift and damage recovery. The feather shaft is the predominant load-bearing component of the feather and is composed of the calamus and the rachis. Both the shaft and barbs consist of an external hollow shell filled with cellular keratin. Quantitative measurements of core (medulla) density and viscoelastic parameters are made across several avian species. There is a notable decrease in both storage and loss moduli with the mass of the birds. The mechanics of the feather shaft are explored through 3D-printed bioinspired designs to investigate structure-property relationships with respect to flight. Sandwich structures inspired by the feather shaft are printed with and without a foam core to establish flexural properties. The flexural strength of the sandwich structure increases with the addition of a foam core, due to the increase in the resistance to buckling and a modest moment of inertia. However, the stiffness is not significantly altered with the addition of the core. It is primarily determined by the cortex since the foam provides negligible moment of inertia. Both experiments and analysis on synthetic systems demonstrate that the feather rachis uses a highly optimized design. © 2024, The Authors. All rights reserved.

关键词： Viscoelasticity

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Exploring van der Waals materials with high anisotropy:geometrical and optical approaches

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Light(science & Applications) 2024年第4期13卷 645-653页

作者： Aleksandr S.Slavich Georgy A.Ermolaev Mikhail K.Tatmyshevskiy Adilet N.Toksumakov Olga G.Matveeva Dmitriy V.Grudinin Kirill V.Voronin Arslan Mazitov Konstantin V.Kravtsov Alexander V.Syuy Dmitry M.Tsymbarenko Mikhail S.Mironov Sergey M.Novikov Ivan Kruglov Davit A.Ghazaryan Andrey A.Vyshnevyy Aleksey V.Arsenin Valentyn S.Volkov Kostya S.Novoselov Moscow Center for Advanced Studies Kulakova str.20Moscow 123592Russia. Emerging Technologies Research Center XPANCEOInternet CityEmmay TowerDubaiUnited Arab Emirates. Donostia International Physics Center(DIPC) Donostia/San-Sebastián 20018Spain. Institute of Materials Ecole Polytechnique Federale de Lausanne1015 LausanneSwitzerland. Department of Chemistry Lomonosov Moscow State UniversityMoscow 119991Russia. Laboratory of Advanced Functional Materials Yerevan State UniversityYerevan 0025Armenia. National Graphene Institute(NGI) University of ManchesterManchester M139PLUK. Department of Materials Science and Engineering National University of SingaporeSingapore 03-09 EASingapore. Institute for Functional Intelligent Materials National University of Singapore117544 SingaporeSingapore

The emergence of van der Waals(vdW)materials resulted in the discovery of their high optical,mechanical,and electronic anisotropic properties,immediately enabling countless novel phenomena and *** success inspired an intensive search for the highest possible anisotropic properties among vdW ***,the identification of the most promising among the huge family of vdW materials is a challenging quest requiring innovative ***,we suggest an easy-to-use method for such a survey based on the crystallographic geometrical perspective of vdW materials followed by their optical *** our approach,we found As2S3 as a highly anisotropic vdW *** demonstrates high in-plane optical anisotropy that is~20%larger than for rutile and over two times as large as calcite,high refractive index,and transparency in the visible range,overcoming the century-long record set by *** these benefits,As2S3 opens a pathway towards nextgeneration nanophotonics as demonstrated by an ultrathin true zero-order quarter-wave plate that combines classical and the Fabry–Pérot optical phase ***,our approach provides an effective and easy-to-use method to find vdW materials with the utmost anisotropic properties.

关键词： anisotropy anisotropic high

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Designing N-doped graphene/ReSe_(2)/Ti_(3)C_(2) MXene heterostructure frameworks as promising anodes for high-rate potassium-ion batteries

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Journal of Energy Chemistry 2021年第2期30卷 155-162,I0006页

作者： Zhou Xia Xiwen Chen Haina Cia Zhaodi Fan Yuyang Yi Wanjian Yin Nan Wei Jingsheng Cai Yanfeng Zhang Jingyu Sun College of Energy Soochow Institute for Energy and Materials Innovations(SIEMIS)Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006JiangsuChina Beijing Graphene Institute(BG1) Beijing 100095China Center for Nanochemistry(CNC) Academy for Advanced Interdisciplinary Studies.Department of Materials Science and EngineeringCollege of EngineeringPeking UniversityBeijing 100871China

Developing high-performance anodes for potassium ion batteries(KIBs) is of paramount significance but remains *** the normal sense,electrode materials are prepared by ubiquitous wet chemical routes,which otherwise might not be versatile enough to create desired heterostructures and/or form clean interfacial areas for fast transport of K-ions and *** this line,rate capability/cycling stability of resulting KIBs are greatly *** we present an all-chemical vapor deposition approach to harness the direct synthesis of nitrogen-doped graphene(NG)/rhenium diselenide(ReSe_2)hybrids over three-dimensional MXene supports as superior heterostructure anode material for *** such an innovative design,1 T'-ReSe2 nanoparticles are sandwiched in between the NG coatings and MXene frameworks via strong interfacial interactions,thereby affording facile K~+ diffusion,enhancing overall conductivity,boosting high-power performance and reinforcing structural stability of ***-constructed anode delivers an excellent rate performance of 138 mAh g^(-1) at 10.0 A g^(-1) and a high reversible capacity of 90 mAh g^(-1) at 5 A g^(-1) after 300 ***,the potassium storage mechanism has been systematically probed by advanced in situlex situ characterization techniques in combination with first principles computations.

关键词： K-ion batteries High-rate ReSe_(2) N-doped graphene Heterostructure

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