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SSRN 2024年

作者： Misiak, Michal Latko-Duralek, Paulina Fernandez, Maria Mercedes Martínez, Jorge Luis Olmedo Górecka, Żaneta Malmir, Amir Kozera, Paulina Müller, Alejandro J. Hatzikiriakos, Savas G. Boczkowska, Anna Faculty of Materials Science and Engineering Warsaw University of Technology Woloska 141 Street Warsaw02-507 Poland POLYMAT Department of Polymers and Advanced Materials: Physics Chemistry and Technology Faculty of Chemistry University of the Basque Country Donostia-San Sebastián20018 Spain Department of Chemical and Biological Engineering University of British Columbia 2360 East Mall VancouverBCV6T 1Z3 Canada Technology Partners Foundation Bitwy Warszawskiej 1920r. 7A Warsaw02-366 Poland Ikerbasque Basque Foundation for Science Plaza Euskadi 5 Bilbao48009 Spain

This paper studies the interrelationships between the molecular weight, rheology, and tackiness of three types of thermoplastic hot melt adhesives. The hot melt adhesives employed here differ in their compositions and molecular weights, even when they are based on a similar type of copolyester. Differences in the composition were found to influence the adhesives' crystallization and melting behavior. Furthermore, adhesives with higher molecular weight were observed to possess greater elasticity, leading to significantly enhanced tackiness properties, as evidenced by the higher values of tensile modulus, peak stress, and work of debonding. This elevated tackiness was linked to the increased fibrillation process observed in polymers with higher molecular weights. The outcomes presented in this study underscore the diversity among hot melt adhesives and the critical properties that should be taken into consideration when selecting adhesives for specific applications. © 2024, The Authors. All rights reserved.

关键词： Elasticity

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Green synthesis of metal nanoparticles, characterization, and biosensing applications

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Sensors International 2024年第1期5卷 100287-100287页

作者： Pechyen, Chiravoot Tangnorawich, Benchamaporn Toommee, Surachet Marks, Robert Parcharoen, Yardnapar Department of Materials and Textile Technology Faculty of Science and Technology Thammasat University Pathum Thani 12120 Thailand Thammasat University Center of Excellence in Modern Technology and Advanced Manufacturing for Medical Innovation Thammasat University Pathum Thani 12120 Thailand Department of Physics Faculty of Science and Technology Thammasat University Pathum Thani 12120 Thailand Faculty of Industrial Technology Kamphaeng Phet Rajabhat University Kamphaeng Phet 62000 Thailand The Avram and Stella Goldstein-Goren Department of Biotechnology Engineering Ben-Gurion University of the Negev Beer-Sheva Israel Chulabhorn International College of Medicine Thammasat University Pathum Thani 12120 Thailand

This comprehensive review provides an in-depth overview of the green (biological) synthesis, characterization, and biosensor applications of metal nanoparticles (NPs). Because of their unique physical and chemical properties, high surface area, and nanoscale size, NPs have become crucial in various fields. The review emphasizes the synthesis, properties, and applications of several metal NPs, particularly silver (AgNPs), gold (AuNPs), platinum (PtNPs), copper (CuNPs), zinc oxide (ZnONPs), iron oxide (FeONPs), and palladium (PdNPs). Green synthesis methods, a truly innovative approach, utilize biological substances such as plant extracts, bacteria, fungi, and yeast. These methods offer environmentally friendly and biologically compatible alternatives to conventional chemical synthesis techniques. This review details these sustainable approaches and their advantages over traditional methods. These natural sources provide an abundant, cost-effective, and environmentally sustainable alternative for NP production. The importance of thorough characterization of nanoparticles is also discussed, highlighting techniques such as transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and UV–Vis spectroscopy to analyze the size, shape, surface properties, structural integrity, and optical behavior of the NPs. The review highlights the vast potential of metal NPs in biosensors, which play a critical role in medical diagnostics, environmental monitoring, and food safety. Incorporating metal NPs in electrochemical, optical, thermometric, and piezoelectric biosensors significantly enhances sensitivity and specificity, enabling rapid and real-time detection of various analytes. © 2024 The Authors

关键词： Metal nanoparticles

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On the Physical Layer Security of Visible Light Communications Empowered by Gold Nanoparticles

arXiv

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arXiv 2022年

作者： Han, Geonho Choi, Hyuckjin Kim, Ryeong Myeong Nam, Ki Tae Choi, Junil Tsiftsis, Theodoros A. School of Electrical Engineering Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Department of Materials Science and Engineering Seoul National University Seoul08826 Korea Republic of Department of Informatics and Telecommunications University of Thessaly Lamia35100 Greece

Visible light is a proper spectrum for secure wireless communications because of its high directivity and impermeability in indoor scenarios. However, if an eavesdropper is located very close to a legitimate receiver, secure communications become highly risky. In this paper, to further increase the level of security of visible light communication (VLC) and increase its resilience against to malicious attacks, we propose to capitalize on the recently synthesized gold nanoparticles (GNPs) with chiroptical properties for circularly polarized light resulting the phase retardation that interacts with the linear polarizer angle. GNP plates made by judiciously stacking many GNPs perform as physical secret keys. Transmitters send both the intended symbol and artificial noise to exploit the channel variation effect by the GNP plates, which is highly effective when an eavesdropper is closely located to the legitimate receiver. A new VLC channel model is first developed by representing the effect of GNP plates and linear polarizers in the circular polarization domain. Based on the new channel model, the angles of linear polarizers at the transmitters and legitimate receiver are optimized considering the effect of GNP plates to increase the secrecy rate in wiretapping scenarios. Simulations verify that when the transmitters are equipped with GNP plates, even if the eavesdropper is located right next to the legitimate receiver, insightful results on the physical layer security metrics are gained as follows: 1) the secrecy rate is significantly improved and 2) the symbol error rate gap between the legitimate receiver and eavesdropper becomes much larger due to the chiroptical properties of GNP plates. Copyright © 2022, The Authors. All rights reserved.

关键词： Gold nanoparticles

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Carbon Dots as a Sustainable Electrolyte Enhancer in Aqueous Alkaline Electrochemical Capacitors

SSRN

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SSRN 2024年

作者： Jose, Rajan Ganesh, Gayathry Sunil, Vaishak Ling, JinKiong Qamar, Ummiya Misnon, Izan Izwan Kuila, Biplab Kumar Das, Santanu Yang, Chun-Chen Center for Advanced Intelligent Materials Universiti Malaysia Pahang Al-Sultan Abdullah Pahang Kuantan26300 Malaysia Faculty of Industrial Sciences and Technology Universiti Malaysia Pahang Al-Sultan Abdullah Pahang Kuantan26300 Malaysia Department of Ceramic Engineering Indian Institute of Technology Banaras Hindu University Uttar Pradesh Varanasi221005 India Department of Chemistry Institute of Science Banaras Hindu University Uttar Pradesh Varanasi221005 India Ming Chi University of Technology New Taipei City24301 Taiwan Department of Chemical Engineering Ming Chi University of Technology New Taipei City24301 Taiwan Department of Chemical and Materials Engineering Chang Gung University Kwei-shan Taoyuan333 Taiwan

In the endeavour to increase the energy density and to widen the potential window of aqueous alkaline electrochemical capacitors (EC), this study explores the role of carbon dots (CDs) as an additive in potassium hydroxide electrolyte. The CDs with an average size of ~2.2 nm and negative surface potential are synthesized from a dispersion of palm kernel shell powder in water using a low-temperature hydrothermal process. Electrochemical measurements show that the CD–electrolyte ion (K+) interaction has improved counter ion adsorption in porous carbon electrodes via lowering the characteristic resistances and time constants, which significantly improved the fraction of adsorbed charges than diffusively stored. The improved ionic conductivity is attributed to the improved wettability introduced by the hydrophilic functional groups in the CDs. These parametric changes widened the potential window and marked an 80% increase in the specific energy and over 10% increase in specific power in a practical EC with similar mass-loading as commercial devices. The device with CDs demonstrated superior cycling stability and coulombic efficiency than the control device without them. These findings underscore the potential of CDs as a promising avenue for advancing the performance parameters of aqueous electrolyte EC, aligning with the overarching goal of realising economical, environmentally friendly, and sustainable energy storage solutions. © 2024, The Authors. All rights reserved.

关键词： Electrolytes

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Tuneable large nonlinear charge transport driven by the quantum metric at room temperatures in TbMn6Sn6

arXiv

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arXiv 2024年

作者： Zhao, Weiyao Xing, Kaijian Zhao, Yufei Chen, Lei Hong, Min Yin, Yuefeng Liu, Yang Le, Khoa Dang Gayles, Jacob Tang, Fang Fang, Yong Yan, Binghai Karel, Julie Department of Materials Science & Engineering ARC Centre of Excellence in Future Low-Energy Electronics Technologies Monash University ClaytonVIC3800 Australia School of Physics & Astronomy Monash University ClaytonVIC3800 Australia Department of Condensed Matter Physics Weizmann Institute of Science Rehovot7610001 Israel Centre for Future Materials University of Southern Queensland SpringfieldQLD4300 Australia Monash Centre for Electron Microscopy Monash University ClaytonVIC3800 Australia Department of Physics University of South Florida TampaFL33620 United States Jiangsu Laboratory of Advanced Functional Materials Changshu Institute of Technology Changshu215500 China

Nonlinear electrodynamics in materials manifests as an electronic response that depends on second- or higher-order powers of the applied electromagnetic field. This response is highly dependent on the underlying crystal symmetries in the material and is typically smaller than the linear responses. Nonlinear responses are therefore usually employed to expose the symmetry breaking, geometric properties of the electronic band structure in materials. Naturally, a material system with a strong nonlinear response is also the key component in nonlinear devices. Here we report the strong room-temperature second-harmonic transport response in a quantum magnet, TbMn6Sn6, which is governed by the quantum metric and can be tuned with applied magnetic fields and temperature. We show that around room temperature, which is close to the spontaneous spin-reorientation transition, the magnetic configurations, and therefore the related symmetry breaking phases, are easily controlled. Our results pave the way from quantum materials to high performance tuneable nonlinear device applications at room temperature. © 2024, CC BY-NC-SA.

关键词： Nanocrystals

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Fully integrated and broadband Si-rich silicon nitride wavelength converter based on Bragg scattering intermodal four-wave mixing

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Photonics Research 2024年第S1期12卷 I0001-I0010页

作者： VALERIO VITALI THALÍA DOMÍNGUEZ BUCIO HAO LIU JOSÉMANUEL LUQUE GONZÁLEZ FRANCISCO JURADO-ROMERO ALEJANDRO ORTEGA-MOÑUX GLENN CHURCHILL JAMES C.GATES JAMES HILLIER NIKOLAOS KALFAGIANNIS DANIELE MELATI JENS H.SCHMID ILARIA CRISTIANI PAVEL CHEBEN J.GONZALO WANGÜEMERT-PÉREZ ÑIGO MOLINA-FERNÁNDEZ FREDERIC GARDES COSIMO LACAVA PERIKLIS PETROPOULOS Optoelectronics Research Centre University of SouthamptonSouthampton SO171BJUK Electrical Computer and Biomedical Engineering DepartmentUniversity of PaviaPavia 27100Italy Telecommunication Research Institute(TELMA) Universidad de MálagaCEI Andalucı´a TECHE.T.S.I.Telecomunicación29010 MálagaSpain School of Science and Technology Nottingham Trent UniversityNottingham NG118NSUK Department of Electrical Engineering Eindhoven University of TechnologyEindhoven 5600 MBThe Netherlands Department of Materials Science and Engineering University of IoanninaIoannina 45110Greece Centre de Nanosciences et de Nanotechnologies UniversitéParis-SaclayCNRS91120 PalaiseauFrance Advanced Electronics and Photonics Research Center National Research Council CanadaOttawaOntario K1A 0R6Canada

Intermodal four-wave mixing(FWM)processes have recently attracted significant interest for all-optical signal processing applications thanks to the possibility to control the propagation properties of waves exciting distinct spatial modes of the same *** allows,in principle,to place signals in different spectral regions and satisfy the phase matching condition over considerably larger bandwidths compared to intramodal ***,the demonstrations reported so far have shown a limited bandwidth and suffered from the lack of on-chip components designed for broadband manipulation of different *** demonstrate here a silicon-rich silicon nitride wavelength converter based on Bragg scattering intermodal FWM,which integrates mode conversion,multiplexing and de-multiplexing functionalities *** system enables wavelength conversion between pump waves and a signal located in different telecommunication bands(separated by 60 nm)with a 3 dB bandwidth exceeding 70 nm,which represents,to our knowledge,the widest bandwidth ever achieved in an intermodal FWM-based system.

关键词： scattering pump modal

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The Coupled Effffects of Grain Boundary Strengthening and Orowan Strengthening Examined by Dislocation Dynamics Simulations

SSRN

引用

SSRN 2022年

作者： Jiang, Maoyuan Zhang, Xuzhi Mei, Hai Xu, Shuang Liu, Lisheng Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of Technology Wuhan430070 China Department of Engineering Structure and Mechanics School of Science Wuhan University of Technology Wuhan430070 China

DD simulations are performed to unravel the coupled effects between grain boundary strengthening and Orowan strengthening. With the simulations of a plastically-deformed grain embedded in elastic matrix, the internal stresses associated with inter- and intragranular obstacles are quantified. First, plastic yielding is controlled by the length of dislocation sources. Then, in plastic deformation, the stress contribution of bypassing mechanism increases significantly with the size and number of precipitates, while the stress contribution of geometrically necessary dislocations at grain boundaries slightly decreases. Compared with regular spatial distribution of precipitates, random distribution induces a higher strengthening effect by reducing the dislocation mobility. Simulations of four-grain aggregates involving grain refinement and precipitation are systematically investigated. The volume fraction of precipitates is the key factor controlling the Orowan strengthening in addition to the grain size effect. A generalized Hall-Petch equation based on the mean free path of dislocations is proposed. At low strain, a relatively uniform internal stress field is found inside the aggregates with weak stress concentrations around grain boundaries and precipitates. The underlying mechanisms identified in this work are essential for understanding the plastic behavior of precipitate-strengthened polycrystals. © 2022, The Authors. All rights reserved.

关键词： Grain boundaries

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Comparative analysis of various oxygen production techniques using multi-criteria decision-making methods

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International Journal of Thermofluids 2023年 17卷

作者： Aljaghoub, Haya Alasad, Shamma Alashkar, Adnan AlMallahi, Maryam Hasan, Ranem Obaideen, Khaled Alami, Abdul Hai Department of Industrial Engineering and Engineering Management University of Sharjah Sharjah United Arab Emirates Mechanical Engineering Department American University of Sharjah Sharjah United Arab Emirates Materials Science and Engineering PhD Program American University of Sharjah Sharjah United Arab Emirates Department of Mechanical and Aerospace Engineering United Arab Emirates University Al Ain City United Arab Emirates Department of Sustainable and Renewable Energy Engineering University of Sharjah Sharjah United Arab Emirates Sustainable Energy and Power Systems Research Center RISE University of Sharjah Sharjah United Arab Emirates Center for Advanced Materials Research University of Sharjah Sharjah United Arab Emirates

The current pandemic has adversely affected oxygen production and supply chain, where oxygen treatment is essential for the emergency treatment protocol of patients infected by the virus. This work reports on various techniques of oxygen generation methods, as well as the challenges facing its production, storage, and transportation. Moreover, this study offers a comparative analysis of various oxygen production techniques using Multi-Criteria Decision-Making Methods (MCDM). Technique for Order Preference by Similarity to Ideal Solution (TOPSIS), in addition to the weighting methodologies, Multiplicative Exponential Weighting (MEW) and Simple Additive Weighting (SAW) are chosen as tools to carry out the statistical analysis and rank the oxygen production methods. The ranking criteria includes cost, performance, environmental impact and safety. Moreover, this paper utilizes the Entropy Weight Method (EWM), Criteria Importance Through Inter-criteria Correlation (CRITIC) method, and the Stochastic Dominance (SD) method to distribute the criteria weights. The results show thar oxygen production using membrane technologies is the optimal technique based on all the provided tools and criteria. as it attained the maximum Entropy and Sd values of 0.548 through the TOPSIS method, and the highest CRITIC value through SAW and MEW methods which were 0.260 and 0.236, respectively. © 2022 The Author(s)

关键词： Stochastic systems

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Chipless and Batteryless Microwave Sensor Cell for Remote Detection of Humidity

Chipless and Batteryless Microwave Sensor Cell for Remote De...

引用

Antennas and Propagation & USNC/URSI National Radio science Meeting

作者： Giada Marchi Viviana Mulloni Massimo Donelli Andrea Gaiardo Matteo Valt Antonio Orlando Sreedevi K. Menon Leandro Lorenzelli Center for Sensors and Devices (SD) Fondazione Bruno Kessler Trento Italy Department of Civil Environmental and Mechanical Engineering (DICAM) University of Trento Trento Italy Faculty of Science and Technology Free University of Bolzano-Bozen Bolzano Italy Center for Flexible Electronics and Advanced Materials Amrita Vishwa Vidyapeetham Amritapuri India

ISBN: (数字)9798350369908

ISBN: (纸本)9798350369915

Chipless Radio-Frequency IDentification (RFID) sensors belong to the class of microwave sensors and are a quite innovative sensing solution which provide an added value to sensors operating in an Internet of Things/Everything (IoT/E) era. Research is currently focused in two main directions: studying of the material properties as a function of the transduction mechanism and improving the robustness in the transmission mechanism. Here, the aim is to prove the properties of a sensor prototype based on the Nafion NRE-212 50μm-thick sensitive material, in terms of sensitivity, accuracy, reversibility and real-time response/recovery when the sensor is interrogated wirelessy by a suitable reader. Compared to other sensitive materials for humidity detection, Nafion is comparable in terms of sensitivity to polyvinyl-alcohol (PVA) and paper, but with a real-time response/recovery trends.

关键词： Sensitivity Prototypes Humidity Microwave sensors Market research Real-time systems Robustness

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Ferroelectric Polycrystals: Structural and microstructural levers for property-engineering via domain-wall dynamics

arXiv

引用

arXiv 2022年

作者： Schultheiß, Jan Picht, G. Wang, J. Genenko, Y.A. Chen, L.Q. Daniels, J.E. Koruza, J. Trondheim7034 Norway Experimental Physics V University of Augsburg Augsburg86159 Germany Corporate Sector Advanced Technology Advanced Technologies for Chemical and Biological Systems Robert Bosch GmbH Renningen71272 Germany Department of Materials Science and Engineering The Pennsylvania State University University ParkPA16802 United States Institute of Materials Science Technische Universität Darmstadt Otto-Berndt-Straße 3 Darmstadt64287 Germany School of Materials Science and Engineering University of New South Wales Sydney2052 Australia Institute for Chemistry and Technology of Materials Graz University of Technology Graz8010 Austria

Ferroelectrics have a spontaneous electrical polarization that is arranged into domains and can be reversed by an externally applied field. This high versatility makes them useful in enabling components such as capacitors, sensors, and actuators. The key to tuning their dielectric, piezoelectric, and electromechanical performance is to control the domain structure and the dynamics of the domain walls. In fixed compositions, this is often realized by chemical doping. In addition, structural and microstructural parameters, such as grain size, degree of crystallographic texture or porosity play a key role. A major breakthrough in the field came with the fundamental understanding of the link between the local electric and mechanical driving forces and domain wall motion. Here, the impact of structure and microstructure on these driving forces is reviewed and an engineering toolbox is introduced. An overview of advances in the understanding of domain wall motion on the micro- and nanoscale is provided and discussed in terms of the macroscopic functional performance of polycrystalline ferroelectrics/ferroelastics. In addition, a link to theoretical and computational models is established. The review concludes with a discussion about beyond state-of-the-art characterization techniques, new approaches, and future directions toward non-conventionally ordered ferroelectrics for next-generation nanoelectronics and energy-storage applications. © 2022, CC BY.

关键词： Domain walls

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