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A robust bendable IrO_x thin film via mild alkaline solution process for neuron stimulating electrodes

Surfaces and Interfaces 2024年 44卷

作者： Tso, Kuang-Chih Chan, Tzu-Ying Yu, Tsung-Chun Tao, Yu-Jen Chu, Chao-Yi Chen, San-Yuan Lee, Jyh-Fu Ohta, Jun Chen, Po-Chun Wu, Pu-Wei Graduate Program of Accelerator Light Source National Yang Ming Chiao Tung University Hsinchu 300 Taiwan Division of Materials Science Graduate School of Science and Technology Nara Institute of Science Technology Nara Ikoma Takayama 8916-5 Japan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu 300 Taiwan Institute of Materials Science and Engineering National Taipei University of Technology Taipei 106 Taiwan National Synchrotron Radiation Research Center Hsinchu 300 Taiwan

We demonstrate a unique chemical formula to deposit hydrous iridium oxide thin film on a platinum-coated polyimide substrate. In a mild alkaline solution, the iridium (III) precursor undergoes the ligand exchange and hydrolysis reaction to become the iridium (III) dimers that are physically adsorbed on the substrate for subsequent heterogeneous condensation and growth of amorphous hydrous iridium oxide thin film. Both UV–Vis and X-ray absorption spectroscopy (XAS) are employed to determine the reaction steps involved. The chemical nature and crystallinity of the hydrous iridium oxide thin film are investigated by XAS, X-ray photon spectroscopy, and X-ray diffraction. The hydrous iridium oxide thin film reveals an impressive normalized charge storage capacity (CSC) of 0.3 mC/cm²-nm and a low impedance (80.5 Ω) at 1k Hz. In addition, in bending test of 3,000 cycles, the hydrous iridium oxide thin film retains 91.2 % of its initial normalized CSC without any physical crack and delamination. The cell viability test suggests negligible bio-toxicity. Our results provide a solid evidence of fabricating a robust flexible electrode for neural interfaces for potential use in implantable electronic devices. © 2023 Elsevier B.V.

关键词： Bio-electrode Flexible substrate Implantable electronic devices Iridium dimers Iridium oxide Polyimide

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ZnO AS AN INDUCER OF SPINEL-LIKE PHASE FORMATION ON ALUMINA-BASED CASTABLES 17

ZnO AS AN INDUCER OF SPINEL-LIKE PHASE FORMATION ON ALUMINA-...

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17th Unified International Technical Conference on Refractories, UNITECR 2022

作者： Borges, O.H. Sardelli, J.A.P. Rocha, R.M. Neto, C. Pagliosa Pandolfelli, V.C. Federal University of Sao Carlos Graduate Program in Materials Science and Engineering SP Sao Carlos Brazil FIRE Associate Laboratory SP Sao Carlos Brazil RHI Magnesita Research and Development Center Praça Louis Ensch 240 MG Contagem32210-902 Brazil

Environmental and occupational issues regarding Cr6+ formation urge the replacement of chrome-containing refractories by greener alternatives. For the latest decades, magnesium-containing refractories have been investigated for this purpose, however, few studies evaluated the likelihood of using other chemical elements as inducers of spinel-like phase formation in refractory castables. In this work, the addition of zincite (ZnO) in alumina-based vibrated castables bonded with calcium aluminate cement (CAC) or hydratable alumina (HA) was evaluated and compared with its MgO counterpart. The formation of the Zn-based spinel (ZnAl2O4, gahnite) took place at a lower temperature (1100 ºC) than MgAl2O4 (1300 ºC), resulting in the anticipated strengthening of these compositions. Despite the challenges regarding using ZnO - as its volatilization under reduced atmosphere and fast reaction kinetics -, lower linear dimensional changes, comparable cold modulus of rupture and enhanced thermal shock damage resistance was detected. © 2022 Unified International Technical Conference on Refractories, UNITECR 2022 - Proceedings. All rights reserved.

关键词： Zinc oxide

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Hydrogen Storage Properties of the Ti18V24Nb23Cr33Al2Multicomponent Alloy Using Ti6V4Al Alloy Scraps as Feedstock Material

ACS Sustainable Resource Management

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ACS Sustainable Resource Management 2025年第5期2卷 807-814页

作者： Mariana de Brito Ferraz Claudia Zlotea Walter José Botta Guilherme Zepon Federal University of São Carlos Graduate Program in Materials Science and Engineering (PPGCEM/UFSCar) Rodovia Washington Luiz Km 235 São Carlos 13565-905 São Paulo Brazil Institut de Chimie et des Matériaux de Paris-Est CNRS UMR 7182 2-8 Rue Henri Dunant 94320 Thiais France Federal University of São Carlos Graduate Program in Materials Science and Engineering (PPGCEM/UFSCar) Rodovia Washington Luiz Km 235 São Carlos 13565-905 São Paulo Brazil；Federal University of São Carlos Department of Materials Engineering (DEMa/UFSCar) Rodovia Washington Luiz Km 235 São Carlos 13565-905 São Paulo Brazil

Hydrogen storage in metal hydrides has been extensively studied due to their capacity to reversibly absorb hydrogen under relatively low pressures. Multicomponent alloys, especially those of the Ti-V-Nb-Cr system, have garnered significant attention because of the possibility of fine-tuning the hydrogen storage properties by compositional control. However, most of the investigations on multicomponent alloys rely on high-purity elements as feedstock materials, which can have a substantial environmental impact due to the energy-intensive processes required to achieve such purity levels. In this work, we propose an alternative approach by utilizing Ti6Al4V alloy (ASTM F136) scraps from the biomedical industry as feedstock material to produce Ti18Nb23V24Cr33Al2. The alloy was synthesized by using an arc-melting process, combining Ti6Al4V scraps with other pure elements. Structural analysis using X-ray diffraction (XRD) and scanning electron microscopy (SEM) revealed the formation of a microstructure composed predominantly by a body-centered cubic (BCC) solid solution with a small micro segregation providing additional microstructural insights. The Ti18Nb23V24Cr33Al2alloy exhibited a hydrogen storage capacity of 2.75 wt % H2with room temperature reversibility, presenting hydrogen storage properties comparable to those of a (TiVNb)65Cr35alloy produced only from high-purity *** study presents a sustainable approach to producing Ti18Nb23V24Cr33Al2alloy from Ti6Al4V machine chips, achieving efficient hydrogen storage with reduced environmental impact.

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Intelligent Chemical Purification Technique Based on Machine Learning

arXiv

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arXiv 2024年

作者： Wu, Wenchao Xu, Hao Zhang, Dongxiao Mo, Fanyang School of Materials Science and Engineering Peking University Beijing100871 China College of Engineering Peking University Beijing100871 China Ningbo Institute of Digital Twin Eastern Institute of Technology Zhejiang Ningbo315200 China School of Advanced Materials Peking University Shenzhen Graduate School Shenzhen518055 China -Preferred Program Peking University Shenzhen Graduate School Shenzhen518055 China

We present an innovative of artificial intelligence with column chromatography, aiming to resolve inefficiencies and standardize data collection in chemical separation and purification domain. By developing an automated platform for precise data acquisition and employing advanced machine learning algorithms, we constructed predictive models to forecast key separation parameters, thereby enhancing the efficiency and quality of chromatographic processes. The application of transfer learning allows the model to adapt across various column specifications, broadening its utility. A novel metric, separation probability (Sp), quantifies the likelihood of effective compound separation, validated through experimental verification. This study signifies a significant step forward int the application of AI in chemical research, offering a scalable solution to traditional chromatography challenges and providing a foundation for future technological advancements in chemical analysis and purification. Copyright © 2024, The Authors. All rights reserved.

关键词： Column chromatography

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Review Integration of smartphone technology and artificial intelligence for advanced ophthalmic care:A systematic review

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Advances in Ophthalmology Practice and Research 2024年第3期4卷 120-127页

作者： Kai Jin Yingyu Li Hongkang Wu Yih Chung Tham Victor Koh Yitian Zhao Ryo Kawasaki Andrzej Grzybowski Juan Ye Eye Center The Second Affiliated Hospital of Zhejiang University School of MedicineZhejiang Provincial Key Laboratory of OphthalmologyZhejiang Provincial Clinical Research Center for Eye DiseasesZhejiang Provincial Engineering Institute on Eye DiseasesHangzhouChina Centre for Innovation and Precision Eye Health National University of SingaporeSingapore Department of Ophthalmology National University of SingaporeSingapore Singapore Eye Research Institute Singapore National Eye CentreSingapore Ophthalmology and Visual Science Academic Clinical Program Duke-NUS Medical SchoolSingapore Cixi Institute of Biomedical Engineering Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingboChina Ningbo Eye Hospital NingboChina Zhejiang International Scientific and Technological Cooperative Base of Biomedical Materials and Technology Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingboChina Zhejiang Engineering Research Center for Biomedical Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingboChina Division of Public Health Department of Social MedicineGraduate School of MedicineOsaka UniversityOsakaJapan Artificial Intelligence Center for Medical Research and Application Osaka University HospitalOsakaJapan Institute for Research in Ophthalmology Foundation for Ophthalmology DevelopmentPoznanPoland

Background:The convergence of smartphone technology and artificial intelligence(AI)has revolutionized the landscape of ophthalmic care,offering unprecedented opportunities for diagnosis,monitoring,and management of ocular ***,there is a lack of systematic studies on discussing the integration of smart-phone and AI in this *** text:This review includes 52 studies,and explores the integration of smartphones and AI in ophthalmology,delineating its collective impact on screening methodologies,disease detection,telemedicine initiatives,and patient *** collective findings from the curated studies indicate promising performance of the smartphone-based AI screening for various ocular diseases which encompass major retinal diseases,glaucoma,cataract,visual impairment in children and ocular surface ***,the utilization of smartphone-based imaging modalities,coupled with AI algorithms,is able to provide timely,efficient and cost-effective screening for ocular *** modality can also facilitate patient self-monitoring,remote patient monitoring and enhancing accessibility to eye care services,particularly in underserved *** involving data pri-vacy,algorithm validation,regulatory frameworks and issues of trust are still need to be ***,evaluation on real-world implementation is imperative as well,and real-world prospective studies are currently ***:Smartphone ocular imaging merged with AI enables earlier,precise diagnoses,personalized treat-ments,and enhanced service accessibility in eye *** is crucial to navigate ethical and data security challenges while responsibly leveraging these innovations,promising a potential revolution in care access and global eye health equity.

关键词： Artificial intelligence Smartphone imaging Ophthalmology Telemedicine Ocular disease management

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Investigation on Spark Plasma Sintering of Calcareous Waste Concrete Powder and Coal Fly Ash

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Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 2023年第11期70卷 451-460页

作者： Kanda, Yasuyuki Shinjo, Tomohide Mechanical Engineering Program School of Engineering Faculty of Engineering University of the Ryukyus 1 Senbaru Nishihara-cho Okinawa Nakagami-gun903-0213 Japan Solid Mechanics and Materials Engineering Graduate School of Engineering and Science University of the Ryukyus 1 Senbaru Nishihara-cho Okinawa Nakagami-gun903-0213 Japan

This paper aims to fabricate a composite material using calcareous waste concrete powder and coal fly ash (FA) by spark plasma sintering. The effect of FA addition on the mechanical properties of the composite material were investigated. The maximum FA content was 7.5 wt%. The relative density of the composite material was approximately 1.0, independent of FA content. In contrast, the Vickers hardness, flexural strength, and flexural modulus increased with increasing FA content. However, the dispersion state of FA in the composite material was not observed by scanning electron microscopy. Powder X-ray diffraction of the composite material revealed that spurrite and wollastonite were formed identically, independent of FA content. Therefore, FA serves as a reinforcement in the composite material. © 2023 Japan Society of Powder and Powder Metallurgy.

关键词： Spark plasma sintering

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Reusable Hydrogen Storage Tank with Flange Design

Reusable Hydrogen Storage Tank with Flange Design

引用

International Conference on Applied System Innovation (ICASI)

作者： Yun-Qi Li Hsuan-Jung Chen Hsi-Wen Yang Chih-Yuan Chen Shao-Fu Chang Ssu-Ying Chen Chien-Chon Chen College of Engineering and Science Ph.D. Program in Materials and Chemical Engineering National United University Miaoli Taiwan Department of Chemistry Michigan State University MI USA Department of Materials Engineering National United University Miaoli Taiwan Graduate Institute of Intellectual Property National Taipei University of Technology Taiwan Department of Energy Engineering National United University Miaoli Taiwan

ISBN: (数字)9798350394924

ISBN: (纸本)9798350394931

For how to store and transport hydrogen, the first thought is to store hydrogen directly in the cylinder. However, this method is not desirable, because generally at least 700 atm high pressure, the hydrogen contained in the cylinder to be useful. Therefore it is very unsafe at such high pressures. In This paper, we design and production of a new generation of solid-state hydrogen storage and discharge container. The goal of “development of solid-state hydrogen storage technology” is to break through the bottlenecks of hydrogen storage technology safety, hydrogen storage density, high-efficiency hydrogen absorption and release, transportation safety, and engineering practice.

关键词： Technological innovation Hydrogen storage Temperature Surface resistance Hydrogen Transportation Production

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Biodegradable Pbat/Pla Blend Films Incorporated with Turmeric and Cinnamomum Powder: A Potential Alternative for Active Food Packaging

SSRN

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SSRN 2023年

作者： de Castro, Layara L.R.L. Abreu, Iago R. Braz, Cristiano J.F. Rodrigues, Samara C.S. dos Araújo, Regilda S.R.M. Folkersma, Rudy de Carvalho, Laura H. Barbosa, Renata Alves, Tatianny S. Graduate Program in Materials Science and Engineering Federal University of Piauí Teresina64.049-550 Brazil Department of Physics Federal Institute of Education Science and Technology of Piauí Teresina Central Campus Teresina64.000-040 Brazil Department of Nutrition Federal University of Piauí Teresina64.049-550 Brazil NHL Stenden University of Applied Sciences Groningen9727 Netherlands Graduate Program in Materials Science and Engineering Federal University of Campina Grande PI TeresinaCEP: 58.100-000 Brazil

Active packaging made from biodegradable polymers and natural additives appears as an ecological alternative. In addition to having antioxidant activity and enhancing food preservation, it allows mitigating the negative impacts caused by improper disposal. This study pursued to produce biodegradable films based on a polymer blend PBAT/PLA (Ecovio®) using the flat extrusion method. The films were prepared with the incorporation of 5 wt% of powdered turmeric or cinnamon as natural additives. The films obtained, and those reprocessed twice, were characterized in terms of colorimetric, UV light transmittance, water contact angle, water vapor permeability, morphology, mechanical properties, and antioxidant activity. Cinnamon reduced the UV light transmittance and made a surface more hydrophobic. Reprocessing led to greater elongation and maximum load, associated with increased dispersion and distribution, as evidenced in the morphological analysis. The films developed have significant potential for applications in active food packaging, with emphasis on cinnamon-additivated films. © 2023, The Authors. All rights reserved.

关键词： Biodegradable polymers

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A Robust Bendable Irox Thin Film Via Mild Alkaline Solution Process for Neuron Stimulating Electrodes

SSRN

引用

SSRN 2023年

作者： Tso, Kuang-Chih Chan, Tzu-Ying Yu, Tsung-Chun Pan, Shih-Chin Chu, Chao-Yi Chen, San-Yuan Lee, Jyh-Fu Ohta, Jun Wu, Pu-Wei Chen, Po-Chun Graduate Program of Accelerator Light Source National Yang Ming Chiao Tung University Hsinchu300 Taiwan Division of Materials Science Graduate School of Science and Technology Nara Institute of Science Technology Takayama Ikoma Nara8916-5 Japan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu300 Taiwan Institute of Materials Science and Engineering National Taipei University of Technology Taipei106 Taiwan National Synchrotron Radiation Research Center Hsinchu300 Taiwan

We demonstrate a unique chemical formula to deposit hydrous iridium oxide thin film on a platinum-coated polyimide substrate. In a mild alkaline solution, the iridium (III) precursor undergoes the ligand exchange and hydrolysis reaction to become the iridium (III) dimers that are physically adsorbed on the substrate for subsequent heterogeneous condensation and growth of amorphous hydrous iridium oxide thin film. Both UV-Vis and X-ray absorption spectroscopy (XAS) are employed to determine the reaction steps involved. The chemical nature and crystallinity of the hydrous iridium oxide thin film are investigated by XAS, X-ray photon spectroscopy, and X-ray diffraction. The hydrous iridium oxide thin film reveals an impressive normalized charge storage capacity (CSC) of 0.3 mC/cm2-nm and a low impedance (80.5 Ω) at 1k Hz. In addition, in bending test of 3,000 cycles, the hydrous iridium oxide thin film retains 91.2% of its initial normalized CSC without any physical crack and delamination. The cell viability test suggests negligible bio-toxicity. Our results provide a solid evidence of fabricating a robust flexible electrode for neural interfaces for potential use in implantable electronic devices. © 2023, The Authors. All rights reserved.

关键词： Iridium compounds

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Topology of three-dimensional Dirac semimetals and quantum spin Hall systems without gapless edge modes

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Physical Review Research 2023年第1期5卷 L012019-L012019页

作者： Alexander C. Tyner Shouvik Sur Danilo Puggioni James M. Rondinelli Pallab Goswami Graduate Program in Applied Physics Northwestern University Evanston Illinois 60208USA Department of Physics and Astronomy Northwestern University Evanston Illinois 60208 USA Department of Materials Science and Engineering Northwestern University Illinois 60208 USA Northwestern Argonne Institute for Science and Engineering Evanston Illinois 60208 USA

The quantum spin Hall states are usually expected to possess gapless, helical edge modes. We show that the generic, n-fold-symmetric, momentum planes of three-dimensional, stable Dirac semimetals, which are orthogonal to the direction of nodal separation are examples of generalized quantum spin Hall systems, that possess quantized, spin or relative Chern numbers as bulk topological invariants, and gapped edge modes. We demonstrate these planes and the celebrated Bernevig-Zhang-Hughes model support identical quantized, non-Abelian Berry flux of magnitude 2π. Hence, they display identical quantized, topological response such as spin-charge separation and pumping of one Kramers-pair or SU(2) doublet, when probed with a magnetic flux tube. The Dirac points are identified as unit-strength, monopoles of SO(5) Berry connection, describing topological phase transitions between generalized quantum spin Hall and trivial insulators. Our work identifies precise bulk invariant and quantized response of Dirac semimetals, which are not diagnosed by nested Wilson loops and filling anomaly of corner-localized-states, and shows that many two-dimensional higher-order topological insulators can be understood as generalized quantum spin Hall systems.

关键词： Fractionalization Geometric & topological phases Spintronics Topological insulators Topological phase transition Topological phases of matter

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