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Chemosphere 2024年 363卷 142926页

作者： Kim, Ki Jung Gwon, Yeongseo An, Eun Ji Lee, Jieun Jo, Jin Hui Park, Sungmin Chi, Won Seok Department of Polymer Engineering Graduate School Chonnam National University 77 Yongbong-ro Buk-gu Gwangju61186 Korea Republic of Advanced Materials Division Korea Research Institute of Chemical Technology 141 Gajeong-ro Yuseong-gu Daejeon34114 Korea Republic of School of Polymer Science and Engineering Chonnam National University 77 Yongbong-ro Buk-gu Gwangju61186 Korea Republic of

We report hydroxyl-functionalized microporous polymers with tunable benzaldehyde groups for gas separation membranes. These polymers were synthesized via acid-catalyzed Friedel-Crafts polycondensation. The tunability in d-spacing and fractional free volume of these polymers depends on the para position substituents (-H, –F, -Cl, and -Br) of the benzaldehyde. Specifically, the size and polarity of the para position substituent influence the polymer chain-packing structure. Consequently, the hydroxyl-functionalized microporous polymer membrane with a larger para position substituent in the benzaldehyde group exhibited improved gas permeability. This improvement is due to enhanced gas diffusivity resulting from the inefficient polymer chain-packing structure. Furthermore, these membranes demonstrated enhanced CO2 plasticization resistance, attributable to the rigid, contorted polymer structure and the hydrogen bonding interactions between hydroxyl groups. This study provides insights into the relationship between the polymer chain-packing structure, tunable para position substituents, and molecular transport. © 2024 Elsevier Ltd

关键词： Polycondensation

Soliton Vortex Comb Generation in an AlGaAs Microresonator for Self-Torque Pulse Synthesis

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Soliton Vortex Comb Generation in an AlGaAs Microresonator f...

Conference on Lasers and Electro-Optics (CLEO)

作者： Y. Liu B. Chen Y. Zhou C. Ye Q. Cao P. Huang C. Kim Y. Zheng L. K. Oxenløwe K. Yvind J. Li Y. Zhang C. Dong S. Fu Q. Zhan X. Wang J. Liu M. Pu Department of Electrical and Photonics Engineering DTU Electro Technical University of Denmark Denmark State Key Laboratory of Optoelectronic Materials and Technologies School of Physics School of Electronics and Information Technology Sun Yat-sen University Guangzhou China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai China Zhangjiang Laboratory Shanghai China Institute of Advanced Photonics Technology School of Information Engineering Guangdong University of Technology Guangzhou China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area Shenzhen China

We demonstrate bright soliton generation at room temperature within a grating-dressed AlGaAs-on-insulator microresonator and the simultaneous emission of phase-locked vortices, enabling the synthesis of self-torque pu... 详细信息

ISBN: (纸本)9798350369311

关键词： Solitons Lasers and electrooptics Microcavities Gratings Electro-optical waveguides

Impact of Preprocessing of Graphene Additive Via Ultrasonication on the Electrochemical Performance of Activated Carbon/Graphene Composite Lithium-Ion Battery Anodes

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SSRN 2024年

作者： Shahroudi, Hamideh Shaker, Majid Ghazvini, Aliasghar Sadeghi Molababaei, Mahsa Samandari, Hadis Saznaghi, Maryam Hemmati Javanmardi, Shayan Farhadi, Saeed Chameh, Behnam Hajizadeh, Amirhossein Riahifar, Reza Raissi, Babak Yaghmaee, Maziar Sahba Shahalizade, Taieb Department of Nanotechnology and Advanced Materials Materials and Energy Research Center Karaj Iran Lehrstuhl für Physikalische Chemie II Friedrich-Alexander-Universität Erlangen-Nürnberg Egerlandstr. 3 Erlangen91058 Germany Chongqing 2D Materials Institute Liangjiang New Area Chongqing400714 China Department of Materials Science and Engineering Tarbiat Modares University Tehran Iran R&D Center Parthian Battery Novin Co. Ltd Tehran Iran Hafez Ave. P.O. Box 15875-4413 Tehran Iran School of Chemical Engineering College of Engineering University of Tehran Tehran*** Iran Department of Chemistry Iran University of Science and Technology Narmak Tehran*** Iran Department of Technical Physics University of Eastern Finland Kuopio70210 Finland School of Chemistry College of Science University of Tehran P.O. Box 14155- Tehran6455 Iran

In this research, composites of graphene and activated carbon (AC) were used as anode active materials for lithium-ion batteries (LIBs). 5 wt.% graphene was used as additive in powder (GP) and suspension in an organic solvent (GL) forms. The initial discharge capacities and coulombic efficiencies at 0.05 A g-1 were: AC (1578 mAh g-1, 38%), AC-5% GP (2593 mAh g-1, 41%), and AC-5% GL (3969 mAh g-1, 41%). At 5 A g-1, the initial discharge capacities were: AC (81 mAh g-1), AC-5% GP (129 mAh g-1), and AC-5% GL (187 mAh g-1). After 500 cycles, the capacity retention was ~50% for AC, 87% for AC-5% GP, and 100% for AC-5% GL. The AC-5% GL anode exhibited 1528 Wh kg-1 energy density at 19.3 W kg-1 power density and 120 Wh kg-1 at 2386 W kg-1. The superior performance of AC-5% GL was attributed to better dispersion of thinner graphene sheets by efficient exfoliation in the organic solvent, increasing the average pore diameter from 3.00 to 3.87 nm and enhancing electrolyte uptake, as confirmed by nitrogen adsorption-desorption isotherms, contact angle, and wicking tests. The study highlights employing graphene with AC for optimized LIB anode performance. © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

Enhanced Mechanical Properties and High Electrical Conductivity of Copper Alloy Via Dual-Nanoprecipitation

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SSRN 2022年

作者： Geng, Yongfeng Zhou, Meng Zhang, Yi Ban, Yijie Li, Xu Jia, Yanlin Liang, Shengli Tian, Baohong Liu, Yong Volinsky, Alex A. School of Materials Science and Engineering Henan University of Science and Technology Luoyang471023 China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai200240 China Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal new Materials and Advanced Processing Technology Henan Province Luoyang471023 China Henan Province Key Laboratory of Nonferrous Materials Science and Processing Technology Luoyang471023 China Center for Advanced Measurement Science National Institute of Metrology Beijing100029 China College of Materials Science and Engineering Central South University Changsha410083 China Department of Mechanical Engineering University of South Florida Tampa33620 United States

Copper alloys are widely used as lead frames, electric contact wires and pantographs due to their high electrical conductivity and excellent mechanical properties. At present work, a medium electrical conductivity and excellent mechanical properties of Cu-Co-Si-Ti-Ce alloy was obtained by the vacuum melting process with the optimum performance of 225 HV, 702.5 MPa and 40.8% IACS aging at 500 °C for 60 min via the combinations of multiple strengthening. It can be inferred that the high-volume fraction of Goss, Brass, copper and S texture was one of the main reasons for the increase of micro-hardness by comparing the texture content at different conditions. Moreover, it was observed that Co2Si and Co16Ti6Si7 phases exhibited coherent and semi-coherent interface relationships with the copper matrix, respectively, which can relieve the interfacial stress and reduce the interface energy by GPA analysis. Finally, the contributions of solid solution strengthening, work-hardening, grain boundary strengthening and precipitation strengthening were calculated, contributing most to the precipitation strengthening. © 2022, The Authors. All rights reserved.

关键词： Precipitation (chemical)

Effect of Temperature on Sic Whiskers Growth of Sicw/Sic Composites Based on Selective Laser Sintering and Their Mechanical Properties

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SSRN 2022年

作者： Lu, Decai Cheng, Su Jin, Laizhen Zhang, Liwei Shi, Dequan Yue, Hongyan Zeng, Tao School of Architectural Engineering Harbin University of Science & Technology Harbin150080 China School of Materials Science & Chemical Engineering Harbin University of Science & Technology Harbin150080 China Shandong Institute of Advanced Technology Chinese Academy of Sciences Jinan250000 China Department of Civil and Environmental Engineering College of Engineering Shantou University Shantou515063 China

The SiCW/SiC composites was prepared based on selective laser sintering (SLS) technology, and the effect of sintering temperature on the growing number of SiCW/SiC whiskers was studied. According to the classical diffusion theory, the growth process of SiC whiskers at each stage was analyzed, and the relationship model between the number of whiskers and temperature was built. The growth rate of in-situ SiC whiskers was decided by V-L (Vapor-Liquid) and L-S (Liquid-Solid) stages. It is decided by L-S at 1322℃-1438℃, V-L at 1438℃-1458℃, and L-S at 1458℃-1600℃. This is mainly due to different rates of SiO and CO gases generated by PCS at different temperatures. By coupling with the model of porosity and the number of whiskers, a model between the number of SiC whiskers growth in the SiCW/SiC composite materials and temperature-porosity was obtained, and this model has a high accuracy of more than 93%. The mechanical properties of the samples with similar volume density treated by the PIP process showed that the fracture toughness of the unit volume density was increased by 4.64%, 112.01%, and 121.37% for samples A-1, A-2, and A-3, respectively, which indicates that the SiC whiskers grow the fracture toughness and has excellent toughening effect. The model is applicable for in-situ SiC whisker microstructure based on SLS, and also for other 3D printing in-situ whisker toughening systems. © 2022, The Authors. All rights reserved.

关键词： Porosity

Imidazole-Based Dual Functional Chemosensor for the Recognition of Cu2+ and Cn-: Applications in Real Water Samples and Colorimetric Test Strips

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SSRN 2023年

作者： Iyer, Sathiyanarayanan Kulathu Kumar, Selin Manoj Munusamy, Sathishkumar Jothi, Dhanapal Enbanathan, Saravanan Haribabu, Jebiti Department of Chemistry School of Advanced Sciences Vellore Institute of Technology Vellore632014 India Department of Chemistry University of Missouri-Columbia ColumbiaMO United States Department of Advanced Organic Materials Science and Engineering Chungnam National University Deajeon34141 Korea Republic of Facultad de Medicina Universidad de Atacama Los Carreras 1579 Copiapo1532502 Chile

The simple imidazole-based chemosensor 1,4-phenylene bis(3-(3-(4,5-diphenyl-1H-imidazol-2-yl)-2-hydroxyphenyl)acrylonitrile (PDIA) has been constructed for the selective discrimination of CN- and Cu2+ ions. The chemosensor PDIA can be easily prepared from 3-(4,5-diphenyl-1H-imidazol-2-yl)-2-hydroxybenzaldehyde and 1,4-Phenylenediacetonitrile. When exposed to Cu2+ and CN- ions in solution, this chemosensor exhibited a dramatic color shift and fluorescence switch off. The detection limits for Cu2+ and CN- were 6.36 and 3.75 nM, respectively, which were far lower than the recommendations of the World Health Organization. The proposed mechanism of sensor PDIA was supported by mass and DFT analysis. Additionally, the sensor PDIA has been successfully used to analyze environmental sample and as a paper strip sensor. © 2023, The Authors. All rights reserved.

关键词： Chemosensor

Endogenous Antibiotics as Extracellular Electron Shuttles forMicrobacteriumspp.

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ACS Electrochemistry

ACS Electrochemistry 2024年第2期1卷 138-142页

作者： Qi-Zhong Wu Li-Wen Cao Zhong-Hua Liu Wen-Zheng Du Chen-Chen Wang Wen-Wei Li School of Life Sciences University of Science and Technology of China Hefei 230026 China；CAS Key Laboratory of Urban Pollutant Conversion Department of Environmental Science and Engineering University of Science and Technology of China Hefei 230026 China School of Life Sciences University of Science and Technology of China Hefei 230026 China MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics Hefei National Research Center for Physical Sciences at the Microscale Division of Life Sciences and Medicine University of Science and Technology of China Hefei 230027 China University Laboratory of Metabolism and Health of Guangdong Southern University of Science and Technology Shenzhen 518055 China CAS Key Laboratory of Urban Pollutant Conversion Department of Environmental Science and Engineering University of Science and Technology of China Hefei 230026 China；Sustainable Energy and Environmental Materials Innovation Center Suzhou Institute for Advanced Research of USTC Suzhou 215123 China

Electro-active microorganisms (EAMs) profoundly affect elemental geochemical cycling and environmental remediation processes. While the roles of microbial-secreted antibiotics in suppressing other coexisting microbial species have been widely recognized, here we discover that such antibiotics can also serve as redox electron mediators to augment microbial extracellular respiration. Specifically, the mitomycin C secreted byMicrobacterium proteolyticumustc, a member ofActinobacteria, not only inhibited the activity and growth ofEscherichia coliandBacillus subtilisbut also strengthened the extracellular electron transfer rate by 2.5-times. This dual role of antibiotics renders theActinobacteriaunique ecological advantages for gaining energy in an anoxic environment. Overall, our work unveils an overlooked role of antibiotics for strengthening microbial electroactivity, which may have important implications for environmental remediation and bioelectrochemical applications.

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NanoIEA: A Nanopatterned Interdigitated Electrode Array-Based Impedance Assay for Real-Time Measurement of Aligned Endothelial Cell Barrier Functions (Adv. Healthcare Mater. 2/2024)

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advanced HEALTHCARE materials 2024年第2期13卷 2301124-2301124页

作者： Choi, Jong Seob Doo, Hyun Myung Kim, Byunggik Lee, Su Han Sung, Sang-keun Go, Gwangjun Suarez, Allister Kim, Yeseul Weon, Byung Mook Choi, Byung-Ok Kim, Hyung Jin Kim, Deok-Ho Department of Biomedical Engineering Center for Microphysiological Systems Johns Hopkins University Baltimore MD 21205 USA Division of Advanced Materials Engineering Kongju National University Cheonan Chungnam 31080 South Korea Department of Health Sciences and Technology SAIHST Sungkyunkwan University Seoul 06351 South Korea Department of Biomedical Research Center Korea University Guro Hospital Seoul 08308 South Korea Division of Medical Oncology Department of Internal Medicine Korea University Guro Hospital Korea University College of Medicine Seoul 08308 South Korea Department of Mechanical Engineering Johns Hopkins University Baltimore MD 21218 USA Digital Health Care Research Center Gumi Electronics and Information Technology Research Institute (GERI) Gumi Gyeongbuk 39253 South Korea Department of Mechanical Engineering Chosun University Gwangju 61452 South Korea SKKU Advanced Institute of Nanotechnology (SAINT) School of Advanced Materials Science and Engineering Sungkyunkwan University Suwon 16419 South Korea Department of Neurology Samsung Medical Center Sungkyunkwan University School of Medicine Seoul 06351 South Korea School of Electrical and Electronic Engineering Ulsan College Ulsan 44610 South Korea Department of Medicine Johns Hopkins University School of Medicine Baltimore MD 21205 USA Institute for Nanobiotechnology Johns Hopkins University Baltimore MD 21218 USA

A nanopatterned interdigitated electrode array (nanoIEA)-based impedance assay is developed for quantitative real-time measurement of aligned endothelial cell (EC) barrier functions in vitro. A bioinspired poly(3,4-dihydroxy-L-phenylalanine) (poly (l-DOPA)) coating is applied to improve the human brain EC adhesion onto the Nafion nanopatterned surfaces. It is found that a poly (l-DOPA)-coated Nafion grooved nanopattern makes the human brain ECs orient along the nanopattern direction. Aligned human brain ECs on Nafion nanopatterns exhibit increased expression of genes encoding tight and adherens junction proteins. Aligned human brain ECs also have enhanced impedance and resistance versus unaligned ones. Treatment with a glycogen synthase kinase-3 inhibitor (GSK3i) further increases impedance and resistance, suggesting synergistic effects occur on the cell–cell tightness of in vitro human brain ECs via a combination of anisotropic matrix nanotopography and GSK3i treatment. It is found that this enhanced cell–cell tightness of the combined approach is accompanied by increased expression of claudin protein. These data demonstrate that the proposed nanoIEA assay integrated with poly (l-DOPA)-coated Nafion nanopatterns and interdigitated electrode arrays can make not only biomimetic aligned ECs, but also enable real-time measurement of the enhanced barrier functions of aligned ECs via tighter cell–cell junctions.

关键词： endothelial barrier function impedance assays interdigitated electrodes nanopatterned Nafion poly (L-DOPA)

Enhancing Bioactivity and Corrosion Resistance of Laser Powder Bed-Fused Ti6al4v Using Titania-Reinforced Hydroxyapatite Nanocomposite Coatings Through Electrophoretic Deposition

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SSRN 2024年

作者： Sohrabpoor, Hamed Salarvand, V. Torabpour, M. Yazdi, M. Saghafi Asadi, P. Brabazon, Dermot Stein, B.D. Raghavendra, R. Department of Intelligent Systems Engineering Luddy School of Informatics Computing and Engineering Indiana University Bloomington BloomingtonIN United States Department of Materials Science and Engineering Imam Khomeini International University Qazvin Iran Department of Mechanical Engineering Engineering Faculty Gebze Technical University Kocaeli Gebze41400 Turkey I-Form Advanced Manufacturing Research Centre & Advanced Processing Technology Research Centre School of Mechanical & Manufacturing Engineering Dublin City University Dublin Ireland Electron Microscopy Center Department of Biology Indiana University BloomingtonIN United States SEAM Research Center South East Technological University Ireland

Hydroxyapatite (HA) coatings are commonly used on titanium alloy substrates for orthopedic and dental implants because of their excellent osteoconductivity and biocompatibility. The disparity in the coefficient of thermal expansion (CTE) between the coating and substrate can result in the formation of cracks in the HA coatings during the coating process. This study examined the effect of titania (TiO2) nanoparticle additions in HA coatings to enhance their properties and prevent cracking. Using electrophoretic deposition (EPD), HA and HA-TiO2 composite coatings were applied to laser powder bed fused Ti6Al4V substrates. Optimal EPD conditions of 45 volts and 120 s were identified to produce consistent, crack-free coatings. Increasing the TiO2 nanoparticle concentration (≥50 wt.%) decreased the coatings' CTE, mitigating cooling-induced cracking. The microstructural analysis confirmed the uniform distribution of HA and TiO2 in the coatings. X-ray diffraction and Fourier-transform infrared spectroscopy data revealed that the HA structure remained intact even with the addition of TiO2. Higher TiO2 reduced the average surface roughness, with the HA-40%TiO2 coating exhibiting the lowest roughness (approximately 50 nm). Electrochemical tests corroborated the surface roughness findings. Incorporating TiO2 into the HA coatings decreased the thermal expansion coefficient, reducing tensile stresses. © 2024, The Authors. All rights reserved.

关键词： Titanium dioxide

Detection of Liposomes Encapsulating Neurotransmitters by Optical Trapping Raman Spectroscopy

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Detection of Liposomes Encapsulating Neurotransmitters by Op...

2022 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2022

作者： Masui, Kyoko Nawa, Yasunori Tokumitsu, Shunsuke Kawarai, Makoto Minoshima, Wataru Tani, Tomomi Fujita, Satoshi Ishitobi, Hidekazu Hosokawa, Chie Inouye, Yasushi Advanced Photonics and Biosensing Open Innovation Laboratory National Institute of Advanced Industrial Science and Technology 2-1 Yamadaoka Osaka Suita565-0871 Japan Graduate School of Frontier Biosciences Osaka University 1-3 Yamadaoka Osaka Suita5650871 Japan Department of Applied Physics Graduate School of Engineering Osaka University 2-1 Yamadaoka Osaka Suita565-0871 Japan Department of Chemistry Division of Molecular Materials Science Graduate School of Science Osaka City University 3-3-138 Sugimoto Sumiyoshi Osaka558-8585 Japan Biomedical Research Institute National Institute of Advanced Industrial Science and Technology 1-8-31 Midorigaoka Ikeda Osaka563-8577 Japan

Optical trapping Raman spectroscopy was used for detection of glutamate molecules encapsulated in liposomes as a mimic of synaptic vesicles. The trapping behavior of glutamate molecules was analyzed by the number of R...

ISBN: (纸本)9798350350012

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