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Research Square 2021年

作者： Jessie, Jackin Boaz Masaki, Shirai Honoka, Haginaka Kinashi, Kenji Tsutsumi, Naoto Sakai, Wataru Materials Innovation Laboratory Kyoto Institute of Technology Kyoto Japan Master’s Programs of Materials Chemistry Kyoto Institute of Technology Kyoto Japan Bachelor’s Program of Materials Chemistry Kyoto Institute of Technology Kyoto Japan Faculty of Materials Science and Engineering Kyoto Institute of Technology Kyoto Japan

An integrated device capable of generating large number of multiplexed optical vortex beams with arbitrary topological charges is considered as one of the crucial requirement for driving information photonics forward. Here we report a simple method for simultaneous generation of 100 multiplexed optical vortex beams from a polymer film of size 1mm2 and thickness of 30µm. This is achieved through a combination of computer generated holography, digital hologram printing and photoisomeric polymers. When the fabricated sample is illuminated with a collimated laser beam, a pre-determined vortex array with arbitrary topological charge is emitted. The polymer film easy to synthesise and exhibits good diffraction efficiency and long retention time. © 2021, CC BY.

关键词： Holograms

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Application of nanocatalyst iron oxide (Fe2O3) to reduce exhaust emissions (CO and HC) 1

Application of nanocatalyst iron oxide (Fe2O3) to reduce exh...

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1st materials Research Society-Indonesia Conference and Congress 2017, MRS-INA C and C 2017

作者： Puspitasari, P. Yazirin, C. Bachtiar, L.A. Dika, J.W. Zaharis, S.M.S.N.S. Mechanical Engineering Department Engineering Faculty Malang State University Semarang street 5 East-Java-Malang Indonesia Center of Nano Research and Advanced Materials Malang State University Semarang street 5 East-Java-Malang Indonesia Master Program of Mechanical Engineering Engineering Faculty Malang State University Semarang street 5 East-Java-Malang Indonesia Bachelor Program Mechanical Engineering Department Malang State University Semarang street 5 East-Java-Malang Indonesia Industrial Chemical Technology Programme Faculty of Science and Technology Universiti Sains Islam Malaysia Bandar Baru Nilai Negeri Sembilan Nilai71800 Malaysia

Fe2O3 has been the interest of many studies due to its applications in various scientific and industrial fields including in environment, corrosion, soil science, and exhaust emissions. Fe2O3 is a chemical mixture that can be applied as a catalyst to reduce exhaust emissions because it is capable of binding CO and HC contained in motorcycle exhaust gases The growth of motor vehicles results in air pollution and an increase in exhaust emissions consisting of 70.50% CO and 18.34% HC. One effort to reduce exhaust emission levels is by applying a catalytic converter to the exhaust system. This research was an experimental research aiming to investigate the difference in emission level of CO and HC between a motorcycle with and without a catalytic converter. The types of fuel used were RON 88, RON 90, RON 92, and RON 98. The results showed that the application of Fe2O3 as a catalyst could reduce the level of CO significantly in RON 88, i.e. 91.43% CO, and the level of HC in RON 88 and RON 92, i.e. 53.27% and 91.07% HC respectively. © Published under licence by IOP Publishing Ltd.

关键词： Catalytic converters

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Carbon nitride- and graphene-based materials for the photocatalytic degradation of emerging water pollutants

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materials Advances 2024年第7期5卷 2668-2688页

作者： Indra Jaya Budiarso Valentinus Alphano Dabur Riska Rachmantyo Hermawan Judawisastra Chechia Hu Arie Wibowo Master Program in Materials Science and Engineering Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 West Java Indonesia Doctoral Program in Materials Science and Engineering Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 West Java Indonesia Materials Science and Engineering Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 West Java Indonesia ariewibowo@itb.ac.id Department of Chemical Engineering National Taiwan University of Science and Technology Taipei 106 Taiwan R&D Center for Membrane Technology Chung Yuan Christian University Taoyuan 320 Taiwan Research Center for Nanoscience and Nanotechnology Institut Teknolgi Bandung Ganesha 10 Bandung 40132 West Java Indonesia

Photocatalytic degradation is a promising way to treat emerging pollutants in wastewater. Recently, metal-free photocatalysts such as carbon nitride- and graphene-based materials have attracted much interest in the photocatalytic degradation of emerging water pollutants owing to their visible light activity and unique electrical properties, respectively. Graphitic carbon nitride (GCN) is considered a superior visible light–active photocatalyst because of its suitable bandgap (2.7 eV). Moreover, the facile synthesis process and the high chemical and thermal stability of GCN make it one of the research hotspots in photocatalytic wastewater treatment. Besides GCN, graphene and its derivatives are utilized to support main photocatalysts by enhancing their light absorption, pollutant adsorption, and photogenerated charge separation. Furthermore, the vast modification of these materials has promoted various outstanding performances in carbon nitride- and graphene-based photocatalysts in the application of pollutant degradation. In this review, we highlight recent developments in carbon nitride- and graphene-based photocatalysts (2018–2023), focusing on the strategies to improve the activity of GCN as a visible light–active photocatalyst and the role of graphene and its derivatives as supporting materials in wastewater pollutant remediation applications.

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New insight into pyrrolic-N site effect towards the first NIR window absorption of pyrrolic-N-rich carbon dots

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Nano Research 2023年第4期16卷 6001-6009页

作者： Fitri Aulia Permatasari Reza Umami Citra Deliana Dewi Sundari Tirta Rona Mayangsari Atthar Luqman Ivansyah Fahdzi Muttaqien Takashi Ogi Ferry Iskandar Department of Physics Faculty Mathematics and Natural SciencesInstitut Teknologi BandungJalan Ganesha 10BandungWest Java 40132Indonesia Collaboration Research Center for Advanced Energy Materials National Research and Innovation Agency-Institut Teknologi BandungJalan Ganesha 10BandungWest Java 40132Indonesia Department of Chemistry Faculty of Mathematics and Natural SciencesInstitut Teknologi BandungJl.Ganesha 10BandungWest Java 40132Indonesia Department of Chemistry Education UIN Sunan Gunung Djati BandungJl.CimincrangBandungWest Java 40292Indonesia Department of Chemistry Universitas PertaminaJakarta 12220Indonesia Master Program in Computational Science Faculty of Mathematics and Natural SciencesInstitut Teknologi BandungJl.Ganesha 10BandungWest Java 40132Indonesia Instrumentation and Computational Physics Research Group Faculty of Mathematics and Natural SciencesInstitut Teknologi BandungJl.Ganesha 10Bandung 40132Indonesia Research Center for Nanoscience and Nanotechnology Institut Teknologi BandungJalan Ganesha 10BandungWest Java 40132Indonesia Chemical Engineering Program Department of Advanced Science and EngineeringGraduate School of Advanced Science and EngineeringHiroshima UniversityHigashi-Hiroshima 739-8527Japan

Controlled C-N configurations,i.e.,pyrrolic-N,pyridinic-N,and graphitic-N,are promising strategies to tailor the carbon dots’(CDs)optical properties into the first near infrared(NIR)window(650-900 nm),a responsive range for biomedical ***,a deep understanding of the role of the C-N configuration in the CDs’properties is still challenging and thoughtprovoking owing to their complex ***,an underlying pyrrolic-N concentration and position effect on the pyrrolic-N-rich CDs’absorption was comprehensively elucidated based on the integrated experimental and computational *** assynthesized pyrrolic-N-rich CDs exhibit a first NIR window absorption centered at 650 nm with high photothermal ***-N concentrations from 1.4%to 11.3%and positions(edge and mid-site)were systematically investigated.A mid-site pyrrolic-N was subsequently generated after the pyrrolic-N concentration more than 10%.Edge-site pyrrolic-N induces a frontier orbital hybridization,reducing bandgap energy,while mid-site pyrrolic-N plays a critical role in inducing a first NIR window absorption owing to their high charge ***,pyrrolic-N-rich CDs inherit a bowl-like topological feature,elevating the CDs’layer thickness as much as 0.71 *** study shed light on the design and optimization of pyrrolic-N on CDs for the first NIR window responsive materials in any biomedical application.

关键词： absorption carbon dots charge transfer first near infrared(NIR)window frontier orbital hybridization mid-site pyrrolic-N

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GAS PRODUCTION AND TURBIDITY DURING UNDERWATER SHIELDED METAL-ARC WELDING WITH IRON POWDER ELECTRODES

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NAVAL ENGINEERS JOURNAL 1971年第6期83卷 59-&页

作者： SILVA, EA The authorwas recently awarded a Ph.D. Degree in the Ocean Engineering Program at the University of California Berkeley. He graduated from Stanford University with a Bachelor of Science Degree in Metallurgical Engineering in 1960 followed by a Master of Science Degree in Materials Science tn 1961. Dr. Silva has experience as a Materials Engineer in the aerospace industry and is an Engineering Duty Officer in the U.S. Naval Reserve. He is a member of the ASNE A1ME ASM AWS MTS SNAME and USNI.

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WELDING PROCESSES IN DEEP OCEAN

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NAVAL ENGINEERS JOURNAL 1968年第4期80卷 561-&页

作者： SILVA, EA THE AUTHOR:is studying for a Ph.D. Degree in the Ocean Engineering program of the University of California at Berkeley. He graduated from Stanford University in 1961 with a Bachelor of Science Degree in Metallurgical Engineering and a Master of Science Degree in Materials Science. Silva is an Engineering Duty Officer in the Naval Reserve and has civilian experience as a Materials Engineer in the aerospace industry. He is a member of the ASNE ASM SNAME AIME and the U. S. Naval Institute.

T his paper anticipates a future need for welding processes in depths to 5000 meters. Arc cutting and joining processes are found to be the most suitable for depths in excess of 1500 meters because they avoid the problem of gas liquification. The underwater arcs are enhanced by constricting effects produced by the deep ocean environment, and no problem with heat generation is expected. Argon or nitrogen shielded arcs are advised for deep sea work. Their use can lead to reduced power requirements, control of penetration and metal transfer rate, and a reduction in porosity and slag inclusions. The cumbersome diving dress required to offset the cold and the problem of visibility in bottom waters is expected to produce the most serious operating difficulties for the welders. Cryogenic gas transport and experimentation in the laboratory and at sea are recommended.

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Centrifugal Spinning of Porous Polylactic Acid Fibers by Centrifugal Spinning with Phase Separation for Oil Removal Application

SSRN

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SSRN 2024年

作者： Negoro, Masaki Doan, Hoan Ngoc Vo, Phu Phong Khuat, Khanh Van Thi Kinashi, Kenji Sakai, Wataru Tsutsumi, Naoto Master’s Program of Innovative Materials Kyoto Institute of Technology Matsugasaki Sakyo Kyoto606-8585 Japan Tissue Engineering and Regenerative Medicine Laboratory School of Biomedical Engineering International University Vietnam National University Ho Chi Minh City Viet Nam Faculty of Chemistry University of Science Ho Chi Minh City Viet Nam Doctor’s Program of Materials Chemistry Graduate School of Science and Technology Kyoto Institute of Technology Matsugasaki Sakyo Kyoto606-8585 Japan Faculty of Materials Science and Engineering Kyoto Institute of Technology Matsugasaki Sakyo Kyoto606-8585 Japan

Developing biodegradable oil absorption fibrous materials is essential because discarding conventional separation materials could cause secondary pollution due to their nondegradable properties. In this study, highly hydrophobic and superoleophilic porous polylactic acid (PLA) fibers were prepared using centrifugal spinning combined with nonsolvent-induced phase separation. The porous structure of PLA fibers was controlled by the ratio between good solvent and nonsolvent in the spinning solutions. The morphology and physical properties of the obtained PLA fibers were investigated using various measurement techniques. The PLA fibrous membrane prepared from a PLA solution containing chloroform/dimethylformamide (80/20 w/w) indicated not only a high water contact angle but also a high oil sorption value. The porous PLA fibers are a potential candidate for use as green materials for environmental applications. © 2024, The Authors. All rights reserved.

关键词： Spinning (fibers)

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Structural and optical properties of buried InAs/GaAs quantum dots on GaAsSb buffer layer

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Journal of Physics D: Applied Physics 2009年第18期42卷

作者： Wu, Y.H. Chang, Li Lin, P.Y. Chiang, C.H. Chen, J.F. Chi, T.W. Department of Materials Science and Engineering National Chiao-Tung University Hsinchu 30050 Taiwan Industrial Technology Research and Development Master Program on Semiconductor Materials and Processing National Chiao-Tung University Hsinchu 30050 Taiwan Department of Eletrophysics National Chiao-Tung University Hsinchu 30050 Taiwan Electronics and Optoelectronics Research Laboratories Industrial Technology Research Institute Hsinchu 30050 Taiwan

In this work, we investigated the effect of a 1 nm thick GaAs 94.3Sb0.57 buffer layer on structural and optical properties of buried InAs quantum dots (QDs) and wetting layers (WLs) in GaAs using photoluminescence (PL) and transmission electron microscopy (TEM). The density and emission wavelength of the QDs on the buffer were increased due to the size and the shape modification in comparison with those without a buffer. PL analysis of the ground-state (GS) peak of the QDs on the buffer showed a red-shift of 18 meV with an enhanced intensity. In addition, PL and TEM show that the buffer has a weak effect on the WLs and no apparent changes occur for the buffer during QD deposition and the capping process. © 2009 IOP Publishing Ltd.

关键词： Buffer layers

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Machine Learning for Analyzing Atomic Force Microscopy (AFM) Images Generated from Polymer Blends

arXiv

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arXiv 2024年

作者： Paruchuri, Aanish Wang, Yunfei Gu, Xiaodan Jayaraman, Arthi Master of Science in Data Science Program University of Delaware NewarkDE19713 United States School of Polymer Science and Engineering University of Southern Mississippi 118 College Drive #5050 HattiesburgMS39406 United States Department of Chemical and Biomolecular Engineering University of Delaware 150 Academy St NewarkDE19713 United States Department of Materials Science and Engineering University of Delaware NewarkDE19713 United States Data Science Institute University of Delaware NewarkDE19713 United States

In this paper we present a new machine learning (ML) workflow with unsupervised learning techniques to identify domains within atomic force microscopy (AFM) images obtained from polymer films. The goal of the workflow is to identify the spatial location of the two types of polymer domains with little to no manual intervention (Task 1) and calculate the domain size distributions which in turn can help qualify the phase separated state of the material as macrophase or microphase ordered/disordered domains (Task 2). We briefly review existing approaches used in other fields - computer vision and signal processing - that can be applicable for the above tasks that happen frequently in the field of polymer science and engineering. We then test these approaches from computer vision and signal processing on the AFM image dataset to identify the strengths and limitations of each of these approaches for our first task. For our first domain segmentation task, we found that the workflow using discrete Fourier transform (DFT) or discrete cosine transform (DCT) with variance statistics as the feature works the best. The popular ResNet50 deep learning approach from computer vision field exhibited relatively poorer performance in the domain segmentation task for our AFM images as compared to the DFT and DCT based workflows. For the second task, for each of 144 input AFM images, we then used an existing porespy python package to calculate the domain size distribution from the output of that image from DFT-based workflow. The information and open-source codes we share in this paper can serve as a guide for researchers in the polymer and soft materials fields who need ML modeling and workflows for automated analyses of AFM images from polymer samples that may have crystalline/amorphous domains, sharp/rough interfaces between domains, or micro or macro- phase separated domains. © 2024, CC BY.

关键词： Unsupervised learning

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Fabrication and Electroluminescent Property of OLED with Boron-Complex

Fabrication and Electroluminescent Property of OLED with Bor...

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Electron Device and Mechanical engineering (ICEDME), International Conference on

作者： Yu-Feng Lin Anchi Yeh Sheng-Lee Chen M-F Fanny Lin Department of Chemical and Materials Engineering ChungYuan Christiant University Taoyuan TW Department of Cosmetic and Fashion Styling Chengshiu University Kaohsiung TW Center of General Education Hsing Wu University of Science and Technology Taoyuan TW The Master program of Education Long Island University at CW Post New York USA

ISBN: (数字)9781728181455

ISBN: (纸本)9781728181462

A novel luminescence boron compound, [2-(4,5- diphenyl-1-imidazole-2-yl) pyridine] (DPIP-BPh2), has been synthesized by the reaction of pyridine-imidazole- based ligand. The decomposed temperature of DPIP-BPh2 is high than 200°C by thermogravimetric analyzer (TGA). For the three-layer organic light-emitting diodes (OLED) with the structure ITO/NPB/DPIP-BPh2/Alq3/Mg-Ag, an emission band centering at 490 nm with the maximum brightness of 1300 cd/m2 was observed, indicating a perfect blue OLED (CIE= 0.22, 0.36). DPIP-BPh2 forms a new family of organometallic emitting materials which which may bring benefits to people in practical applications.

关键词： Boron-Complex Imidazole Electroluminescence Electroluminescence Organic light emitting diodes Imidazoles Electrochemiluminescence fabrication New families Boron Compounds Blue OLED

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