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Reuse of sodium–doped iridium oxide nanoparticles as a bio–stimulating electrode by a chemical and electrochemical recovery process

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Ceramics International 2024年第4期50卷 6220-6228页

作者： Tso, Kuang-Chih Chen, Chieh-Hsuan Chen, Po-Chun Li, Shao-Sian Chen, Jeng-Lung Ohta, Jun Wu, Pu-Wei Division of Materials Science Graduate School of Science and Technology Nara Institute of Science and Technology Nara630-0192 Japan Graduate Degree Program of Science and Technology of Accelerator Light Source National Yang Ming Chiao Tung University Hsinchu300 Taiwan 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

A sequential chlorination and electrochemical reduction process is demonstrated to convert Na–doped iridium oxide nanoparticles into useful IrIIICl63−(aq) serving as the precursor for the fabrication of bio–stimulating electrode. The Na–doped iridium oxide nanoparticles are treated in 35 wt% hydrochloric acid at 70 °C for 18 h to form IrIVCl62−(aq) with pH of 0.3, so the latter could be readily reduced to IrIIICl63−(aq) at a potentiostatic mode of 0.6 V (vs. SCE). The oxidation state and the nature of complexing ligands for the regenerated IrIIICl63− and IrIVCl62−, as well as commercially available IrIIICl63− are validated by X–ray Absorption Spectroscopy. UV–Vis profiles of regenerated IrIVCl62−(aq) are recorded and the absorbance at 487 nm signal is benchmarked against that of standard IrIVCl62−(aq) to obtain the effective regeneration ratio of 68.6%. X–ray diffraction patterns of Na–doped iridium oxide nanoparticles before and after the annealing treatment indicate the amorphous structure facilitates the chlorination step. The regenerated IrIIICl63− is reused to synthesize Na–doped iridium oxide thin film serving as a bio–stimulating electrode for implantable bio–electronics. The regenerated Na–doped iridium oxide thin film reveals a charge-storage capacity of 0.32 mC/cm2-nm and impressive stability that are comparable to those of fresh Na–doped iridium oxide thin film derived from commercially available IrIIICl63−. © 2023 Elsevier Ltd and Techna Group S.r.l.

关键词： Transition metal oxides

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Artificial optoelectronic synapse based on spatiotemporal irradiation to source-sharing circuitry of synaptic phototransistors

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InfoMat 2024年第2期6卷 131-141页

作者： Seungho Song Changsoon Choi Jongtae Ahn Je-Jun Lee Jisu Jang Byoung-Soo Yu Jung Pyo Hong Yong-Sang Ryu Yong-Hoon Kim Do Kyung Hwang Center for Opto-Electronic Materials and Devices Post-Silicon Semiconductor InstituteKorea Institute of Science and Technology(KIST)SeoulRepublic of Korea School of Advanced Materials Science and Engineering Sungkyunkwan UniversitySuwonRepublic of Korea Center for Spintronics Post-Silicon Semiconductor InstituteKorea Institute of Science and Technology(KIST)SeoulRepublic of Korea Division of Nanoscience&Technology KIST SchoolUniversity of Science and Technology(UST)SeoulRepublic of Korea School of Biomedical Engineering Korea UniversitySeoulRepublic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoulRepublic of Korea

To overcome the intrinsic inefficiency of the von Neumann architecture,neuromorphic devices that perform analog vector–matrix multiplication have been highlighted for achieving power-and time-efficient data *** particular,artificial synapses,of which conductance should be programmed to represent the synaptic weights of the artificial neural network,have been intensively researched to realize neuromorphic ***,inspired by excitatory and inhibitory synapses,we develop an artificial optoelectronic synapse that shows both potentiation and depression characteristics triggered only by optical *** design of the artificial optoelectronic synapse,in which excitatory and inhibitory synaptic phototransistors are serially connected,enables these characteristics by spatiotemporally irradiating the phototransistor channels with optical ***,a negative synaptic weight can be realized without the need for electronic components such as *** such attributes,the artificial optoelectronic synapse is demonstrated to classify three digits with a high recognition rate(98.3%)and perform image preprocessing via analog vector-matrix multiplication.

关键词： amorphous oxide semiconductor analog processing artificial synapse neuromorphic optoelectronics

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Low-Temperature Methanolysis of Polycarbonate over Solid Base Sodium Aluminate

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Langmuir 2024年第10期40卷 5338-5347页

作者： Krisbiantoro, Philip Anggo Sato, Miyu Lin, Tzu-Ming Chang, Yu-Chia Peng, Tzu-Yun Wu, Yun-Chih Liao, Weisheng Kamiya, Yuichi Otomo, Ryoichi Wu, Kevin C.-W. Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei11529 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering College of Engineering National Taiwan University Taipei10617 Taiwan Graduate School of Environmental Science Hokkaido University Nishi 5 Kita 10 Sapporo060-0810 Japan Faculty of Environmental Earth Science Hokkaido University Nishi 5 Kita 10 Sapporo060-0810 Japan Center of Atomic Initiative for New Materials National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan320 Taiwan

Herein, a low-cost and readily available sodium aluminate (NaAlO2) was used as a solid base catalyst for the depolymerization of polycarbonate (PC) via methanolysis in the presence of tetrahydrofuran (THF) as a solvent. NaAlO2 was highly active for the reaction, and the performance was comparable to that of soluble strong base SrO and much higher than those of MgO and CaO. By the reaction over the catalyst, a highly pure and crystalline bisphenol A (BPA) was obtained. Among tested organic solvents, THF was the best in aiding PC methanolysis over NaAlO2 due to the polarity similar to PC according to Hansen solubility parameters (HSPs). At 60 °C, 98.1% PC conversion and 96.8% BPA yield were achieved within just 2 h. NaAlO2 was reusable without any severe catalyst deactivation in at least four runs. The mechanistic study revealed that the reaction proceeded via the methoxide pathway, with THF aiding the dissolution of PC. The reaction over NaAlO2 possessed a low apparent activation energy (Ea) of 75.1 kJ mol-1, which is the lowest ever reported so far for the reaction over solid catalysts. © 2024 The Authors. Published by American Chemical Society.

关键词： Sodium Aluminate

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Bioplastics from orange processing waste and poly(lactic acid)

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Future Foods 2025年 11卷

作者： Laís T. Possari Marina S. de Paula George F. Nunes Iago A. Reis Marcos V. Basaglia Caio G. Otoni Sílvia H.P. Bettini Federal University of São Carlos (UFSCar) Graduate Program in Materials Science and Engineering (PPGCEM) São Carlos SP 13565-905 Brazil Federal University of São Carlos (UFSCar) Department of Materials Engineering (DEMa) São Carlos SP 13565-905 Brazil University of Campinas (UNICAMP) Institute of Chemistry Campinas SP 13083-862 Brazil

Bioplastics have the potential to mitigate the aggravating crisis of plastic pollution. Valorizing agri-food side streams for such a purpose is particularly beneficial as it valorizes massively produced waste, thus contributing to the shift towards circular and regenerative productive chains. In this work, citrus pulp (CP) obtained as a by-product from orange juice production was upcycled into thermoplastic compounds via extrusion-assisted plasticization with glycerol. Compounds with poly(lactic acid) (PLA) were then produced by extrusion melt blending. An experimental 2² factorial design with a central point was performed to evaluate their mechanical, thermal, and biodegradation behavior. The levels for the variables plasticized CP (PCP) and glycerol contents were 30 and 70 % for PCP, and 40 and 60 % for glycerol. Calorimetry showed that PCP increased PLA free volume and chain mobility. Still, the different fractions of PCP and glycerol did not alter the melting behavior of the compounds significantly. PCP led to a progressive toughening effect on PLA. Mass loss after 90 d of soil burial reached 53–64 % for the formulations containing 70 % PCP, and PLA chain scission was accelerated at 30 % PCP with 60 % glycerol, and 70 % PCP with 40 % glycerol. This work opens new pathways to citrus biomass valorization by exploring CP, a scarcely investigated residue, and a novel processing strategy. The produced compounds can be applied as bio-based semi-rigid packaging and utensils.

关键词： Biodegradable plastic PLA Biomass Food waste Upcycling Citrus sinensis

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Thermomechanical Characterization of Hot Surface Ignition Device Using Phenomenological Heat Flux Model

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JOURNAL OF PROPULSION AND POWER 2022年第4期38卷 656-670页

作者： Kang, Sang-Guk Ryu, Je Ir Motily, Austen H. Numkiatsakul, Prapassorn Lee, Tonghun Kriven, Waltraud M. Kim, Kenneth S. Kweon, Chol-Bum M. U.S. Army Research Laboratory Aberdeen Proving Ground MD 21005 Aerospace Engineer Weapons and Materials Research Directorate Postdoctoral Fellow Computational and Information Sciences Directorate University of Illinois at Urbana-Champaign Urbana IL 61801 Graduate Student Department of Mechanical Science and Engineering. Student Member AIAA Graduate Student Department of Materials Science and Engineering Professor Department of Mechanical Science and Engineering. Associate Fellow AIAA Professor Department of Materials Science and Engineering Mechanical Engineer Computational and Information Sciences Directorate. Member AIAA Program Manager Computational and Information Sciences Directorate. Member AIAA.

Modern aircraft compression ignition engines that seek to achieve fuel-flexible operation require ignition-assisting devices to perform reliably. Many military propulsion systems, and unmanned aircraft in particular, can use hot surface energy addition to improve engine performance. An analysis of the thermomechanical stress behavior of hot surface ignition devices is therefore critical to ensure that they can satisfy new operational requirements. In this paper, a phenomenological heat-flux model is proposed to simulate heat generation inside a heating element. Two finite element analysis models are established using the proposed heat-flux model in order to characterize the transient thermomechanical behavior of an ignition assistant: a two-dimensional (2-D) axisymmetric model with an equivalent cylindrical heating element and a three-dimensional (3-D) solid model with realistic heating element geometry. The transient behavior of the ignition assistant is investigated at standard conditions by characterizing the temperature and thermal stress inside the device for various input voltages. The effect of the nonaxisymmetric heating element geometry on the temperature and thermal stress distribution is assessed. Furthermore, the 3-D ignition assistant model is used to analyze the thermomechanical behavior of an ignition device subjected to a combustion event inside a rapid compression machine. Multiple circumferential orientations of the heating element plane relative to the spray axis are investigated. Results demonstrate that the observed maximum principal stress depends significantly on heating element orientation.

关键词： Heat Flux Stress Distribution Heat Generation Unmanned Aerial Vehicle Propulsion System Surface Energy Adaptive Mesh Refinement Fuel Injection CFD Simulation Fracture Toughness

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Bending the Rule: Naphthobisthiadiazole-Based Terpolymers with Both High Solubility and Crystallinity for Organic Photovoltaics

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ACS Applied Polymer materials 2024年第5期6卷 2586-2593页

作者： Chou, Li-Hui Chen, Fengkun Nakano, Kyohei Yamanaka, Kodai Mikie, Tsubasa Saito, Masahiko Liu, Cheng-Liang Tajima, Keisuke Osaka, Itaru Department of Applied Chemistry Graduate School of Engineering Hiroshima University Hiroshima Higashi-Hiroshima739-8527 Japan Department of Chemical and Materials Engineering National Central University Taoyuan32001 Taiwan Saitama Wako351-0198 Japan Applied Chemistry Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima Higashi-Hiroshima739-8527 Japan Department of Materials Science and Engineering National Taiwan University Taipei10617 Taiwan

Achieving a good balance between the crystallinity and solubility is of great importance in the design of π-conjugated polymers. Here, we synthesized a series of terpolymers in which small fractions of a planar V-shaped fused ring, triphenyleno[1,2-c:7,8-c′]bis([1,2,5]thiadiazole) (TPTz), are incorporated into the linear-shaped backbone of a highly crystalline polymer based on naphtho[1,2-c:5,6-c′]bis([1,2,5]thiadiazole) (NTz), PNTz4T. Due to the "bending" structure induced by the TPTz unit, the terpolymers had greatly improved solubility by about 5-9 times compared to the linear-shaped PNTz4T. In particular, the terpolymers preserved the crystallinity of PNTz4T to a considerable extent with a higher fraction of face-on oriented domains in films. As a result, the highly solution-processable terpolymers exhibited high photovoltaic performances and slightly outperformed PNTz4T. Our results indicate that the incorporation of a V-shaped unit into a linearly shaped polymer is a good strategy to develop π-conjugated polymers with high solubility and crystallinity. © 2024 American Chemical Society.

关键词： Solubility

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New muonic He atom HFS measurements at J-PARC MUSE

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Interactions 2024年第1期245卷 1-6页

作者： Goto, Yu Fukumura, Seiso Strasser, Patrick Ino, Takashi Iwai, Ryoto Kanda, Sohtaro Kawamura, Shiori Kitaguchi, Masaaki Nishimura, Shoichiro Oku, Takayuki Okudaira, Takuya Shimizu, Hirohiko M. Shimomura, Koichiro Tada, Hiroki Torii, Hiroyuki A. Department of Physics Nagoya University Nagoya Japan Tsukuba Japan Materials and Life Science Division J-PARC Center Tokai Japan Materials Structure Science Program Graduate Institute for Advanced Studies SOKENDAI Tsukuba Japan Kobayashi-Maskawa Institute Nagoya University Nagoya Japan Tokai Japan Graduate School of Science and Engineering Ibaraki University Mito Japan School of Science The University of Tokyo Tokyo Japan

Muonic He (μHe) is a hydrogen-like atom composed of a helium atom with one of its electrons replaced by a negative muon. Measurements of the ground-state hyperfine structure (HFS) interval of the μHe atom is a sensitive tool to test the three-body atomic system, bound-state quantum electrodynamics (QED) theory, and determine fundamental constants of the negative muon magnetic moment and mass. It allows a test of the CPT theorem in muons by comparing these constants with positive muons. Precise measurements of the ground-state HFS interval using a microwave magnetic resonance technique are now in progress at J-PARC by the MuSEUM collaboration. Furthermore, a new experimental approach to recover the muon polarization lost during the muon cascade process is being investigated by repolarizing μHe atoms using a spin-exchange optical pumping (SEOP) technique. The first laser repolarization experiment was recently performed. An overview of the different features of these new μHe atom HFS measurements and the latest results are presented. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Atoms

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Bioactivity, Efficacy, and Safety of a Wound Healing Ointment With Medicinal Plant Bioactives: In Vitro and In Vivo Preclinical Evaluations

Scientific World Journal

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Scientific World Journal 2025年第1期2025卷 9466270页

作者： Floriano, Juliana Ferreira Rodrigues, Daniel Ohara, Rie Almeida, Nara Lígia Martins Lara, Vanessa Soares Sartorelli, Patricia Graeff, Carlos Frederico de Oliveira Grecco, Simone dos Santos González, Alejandra Hortencia Miranda D’Alpino, Paulo Henrique Perlatti Imperial College London National Heart and Lung Institute imperial.ac.uk GBR London United Kingdom Botucatu Medical School São Paulo State University (UNESP) São Paulo unesp.br BRA Botucatu Brazil Bioengineering and Biomaterials Group School of Pharmaceutical Sciences São Paulo State University (UNESP) unesp.br BRA Araraquara São Paulo Brazil Biotechnology and Innovation in Health Program Universidade Anhanguera de São Paulo (UNIAN) São Paulo BRA Brazil Brazil Department of Health Management Fundação Nacional de Gestão de Saúde São Paulo Brazil Undergraduate Program Medical School Universidade Nove de Julho Bauru São Paulo Brazil Department of Surgery Stomatology Pathology and Radiology Bauru School of Dentistry University of São Paulo (USP) São Paulo usp.br BRA Bauru Brazil Department of Chemistry Institute of Environmental Chemical and Pharmaceutical Sciences Federal University of São Paulo São Paulo unifesp.br BRA Diadema Brazil Department of Physics School of Sciences POSMAT-Post-Graduate Program in Materials Science and Technology São Paulo State University (UNESP) São Paulo Bauru Brazil Department of Research and Development (RD) and Innovation Center Triplet Biotechnology Solutions Inc Bauru São Paulo Brazil Post-Graduate Program in Dentistry Uniderp Anhanguera University Mato Grosso do Sul Campo Grande Brazil Post-Graduate Program in Integrated Dental Sciences University of Cuiabá (UNIC) Mato Grosso do Sul Cuiabá Brazil Department of Physics School of Sciences São Paulo State University (UNESP) São Paulo unesp.br BRA Bauru Brazil

Chronic wounds have a significant impact on patients’ quality of life, necessitating the management of pain, infection, bleeding, and emotional challenges. Debridement, which involves the removal of nonviable tissue, is crucial for promoting wound healing. In addition to surgical methods, cost-effective alternatives such as local solutions and ointments with biological properties have been explored. The use of natural compounds with anti-inflammatory, antibacterial, and collagen-synthesizing abilities holds promise for wound healing. This in vitro and in vivo preclinical study aimed to assess the safety and effectiveness of a wound healing ointment containing bioactive ingredients derived from medicinal plants (extracts, essential oils, and vegetable oils). The chemical composition of the ointment was characterized using Fourier transform infrared (FTIR) spectroscopy to gain insights into its synergistic action. Preclinical tests were conducted following standardized protocols. FTIR analysis revealed similarities between the product’s spectrum and that of bioactive compounds. The in vitro tests demonstrated that all formulations of the ointment induced no cell death, DNA damage, or acute toxicity in cell cultures (p < 0.05). No lethal dose was observed, indicating the safety of the ointment at all concentrations. The ointment also stimulated a notably more organized, significantly higher collagen production compared to control groups (p < 0.05). In vivo preclinical analyses also demonstrated no adverse responses being effective in the healing process compared to the control group (silver sulfadiazine) in terms of wound contraction and ulcer re-epithelization (p < 0.05). Significantly higher means of wound contraction were observed in the groups treated with the bioactive-containing ointment when compared to both the positive control group (sulfadiazine) and the control untreated groups (p < 0.05). The regenerative ointment exhibited excellent biocompatibility and bi

关键词： biocompatibility chronic wounds natural compounds preclinical tests wound care

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Analysis of synthetic natural gas injection into charcoal blast furnace

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Journal of materials Research and Technology 2013年第3期2卷 255-262页

作者： Rocha, Elisa Pinto Da Guilherme, Vagner Silva De Castro, José Adilson Sazaki, Yasushi Yagi, Jun-Ichiro Post-Graduation Program in Metallurgical Engineering Universidade Federal Fluminense Volta Redonda RJ Brazil Environmental Metallurgy Laboratory Graduate Institute of Ferrous Technology Pohang University of Science and Technology Pohang Korea Republic of Tohoku University Sendai Japan

Recently, the synthetic natural gas (SNG) has been available for large consumers in the Brazilian domestic market. The SNG is a suitable fuel with potential use to several processes and facilities of the steel industry. This paper investigates the injection of SNG into charcoal blast furnaces as a substitute for granular charcoal charged from the top and pulverized charcoal injections with potential increase of productivity and decrease of specific CO2 emissions. In order to study the effect of replacement of granular charcoal and injection of pulverized charcoal the well known Blast Furnace Five Fluid Model (BF-FFM) is applied to describe detailed phenomena within the process. This model treats the blast furnace as a five-phase reactor, accounting for gas, lump solids (raw iron ore, sinter, pellets and granular charcoal), hot metal, pulverized charcoal, and molten slag. The model is based on conservation equations for mass, momentum, energy and chemical species numerically solved based on the finite volume method (FVM). The SNG has high amount of H2 and strongly affects the inner conditions of the reactor and only a comprehensive model with detailed chemical reaction rates can properly predict the inner parameters of the process and hence furnish useful information to design smooth operational conditions. The simulation results obtained in this study indicated that smooth operations using SNG up to 25 N m3/t of pig iron could be achieved simultaneously by increasing the productivity up to 58% and with a decrease of 40 kg/thm on the granular charcoal charged. © 2013 Brazilian Metallurgical, materials and Mining Association.

关键词： Steelmaking

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Precision measurements of muonium and muonic helium hyperfine structure at J-PARC

arXiv

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arXiv 2025年

作者： Strasser, Patrick Abe, Mitsushi Asai, Kanta Fukumura, Seiso Fushihara, Mahiro Goto, Yu Ino, Takashi Iwai, Ryoto Kanda, Sohtaro Kawamura, Shiori Kitaguchi, Masaaki Nishimura, Shoichiro Oku, Takayuki Okudaira, Takuya Powell, Adam Sasaki, Ken-Ichi Shimizu, Hirohiko M. Shimomura, Koichiro Tada, Hiroki Torii, Hiroyuki A. Yamanaka, Takashi Yamazaki, Takayuki 1-1 Oho Ibaraki Tsukuba305-0801 Japan Materials and Life Science Division J-PARC Center 2-4 Shirakata Tokai-mura Naka-gun Ibaraki319-1195 Japan Materials Structure Science Program Graduate Institute for Advanced Studies SOKENDAI 1-1 Oho Ibaraki Tsukuba305-0801 Japan 1-1 Oho Ibaraki Tsukuba305-0801 Japan Graduate School of Science Nagoya University Furo-cho Chikusa-ku Aichi Nagoya464-8601 Japan Department of Physics Niigata University 8050 Ikarashi 2-no-cho Nishi-ku Niigata-shi Niigata950-2181 Japan Facility for Rare Isotope Beams Michigan State University 640 South Shaw Lane East LansingMI48824 United States Kobayashi-Maskawa Institute Nagoya University Furo-cho Chikusa-ku Aichi Nagoya464-8601 Japan 2-4 Shirakata Tokai-mura Naka-gun Ibaraki319-1195 Japan Graduate School of Science and Engineering Ibaraki University 2-1-1 Bunkyo Ibaraki Mito310-8512 Japan Department of Physics and Astronomy University of Calgary 2500 University Drive NW CalgaryABT2N 1N4 Canada School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Faculty of Arts and Science Kyushu University 744 Motooka Nishi Fukuoka819-0395 Japan

At the J-PARC Muon science Facility (MUSE), the MuSEUM collaboration is now performing new precision measurements of the ground state hyperfine structure (HFS) of both muonium and muonic helium atoms. High-precision measurements of the muonium ground-state HFS are recognized as one of the most sensitive tools for testing bound-state quantum electrodynamics theory to precisely probe the standard model and determine fundamental constants of the positive muon magnetic moment and mass. The same technique can also be employed to measure muonic helium HFS, obtain the negative muon magnetic moment and mass, and test and improve the theory of the three-body atomic system. Measurements at zero magnetic field have already yielded more accurate results than previous experiments for both muonium and muonic helium atoms. High-field measurements are now ready to start collecting data using the world’s most intense pulsed muon beam at the MUSE H-line. We aim to improve the precision of previous measurements ten times for muonium and a hundred times or more for muonic helium. We review all the key developments for these new measurements, focusing on the high-field experiment, and report the latest results and prospects. Copyright © 2025, The Authors. All rights reserved.

关键词： Microwave spectroscopy

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