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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Kritzell, T. Elijah Bao, Junzhe Doumani, Jacques Lee, Jae Joon Xu, Hongjing Tay, Fuyang Nojiri, Hiroyuki Bamba, Motoaki Baydin, Andrey Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Institute for Materials Research Tohoku University Sendai980-8577 Japan The Hakubi Center for Advanced Research Kyoto University Kyoto606-8502 Japan Department of Physics I Kyoto University Kyoto606-8502 Japan Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States

We examine ultrastrong coupling of an ensemble of paramagnetic spins in Gd3Ga5O12 with terahertz photons in the presence of a high external magnetic field both in the bulk and thin-film limits. © 2023 The Author(s)

ISBN: (纸本)9781957171258

关键词： Photons

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Constructing conjugated microporous polymers containing triphenylamine moieties for high-performance capacitive energy storage

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Polymer 2023年 264卷

作者： Samy, Maha Mohamed Gamal Mohamed, Mohamed Sharma, Santosh U. Chaganti, Swetha V. Hassan Mansoure, Tharwat Lee, Jyh-Tsung Chen, Tao Kuo, Shiao-Wei Department of Materials and Optoelectronic Science College of Semiconductor and Advanced Technology Research Center for Functional Polymers and Supramolecular Materials National Sun Yat-Sen University Kaohsiung804 Taiwan Chemistry Department Faculty of Science Assiut University Assiut71515 Egypt International PhD Program for Science National Sun Yat-sen University Kaohsiung80424 Taiwan Department of Chemistry National Sun Yat-Sen University Kaohsiung80424 Taiwan Ningbo Institute of Material Technology and Engineering Chinese Academy of Science Ningbo315201 China Department of Medicinal and Applied Chemistry Kaohsiung Medical University Kaohsiung807 Taiwan

In this research we developed two triphenylamine (TPA)-linked conjugated microporous polymers (CMPs), TPA-TAB and TPA-TBN, through Suzuki couplings of tris(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)amine (TPA-BO) with the aryl bromides tetrakis(4-bromophenyl)benzidine (TAB-Br4) and 2,7,10,15-tetrabromotetrabenzonaphthalene (TBN-Br4), respectively. These CMPs, which have substantial surface surfaces and outstanding thermal stability, could be employed as electrode materials in supercapacitor (SC) devices. In a three-electrode SC, the TPA-TAB CMP exhibited ultrahigh specific capacitance (684 F g−1 at 0.5 A g−1) and long-term stability, with a capacitance retention of 99.5% after 5000 cycles (at 10 A g−1). Moreover, a two-electrode symmetric SC incorporating TPA-TAB CMP presented a capacitance of 117 F g−1 and a high retention of 98% when subjected to 5000 cycles at 10 A g−1. This exceptional performance resulted from was achieved through the use of redox-active TPA units and a large BET surface area (490 m2 g−1). Accordingly, such TPA-CMPs appear to have promise for use in charge and energy storage applications. © 2022 Elsevier Ltd

关键词： Supercapacitor

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Enhancing forensic investigations: Identifying bloodstains on various substrates through ATR-FTIR spectroscopy combined with machine learning algorithms

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Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy 2024年 308卷 123755页

作者： Wei, Chun-Ta You, Jhu-Lin Weng, Shiuh-Ku Jian, Shun-Yi Lee, Jeff Cheng-Lung Chiang, Tang-Lun School of Defense Science Chung Cheng Institute of Technology National Defense University Taoyuan 335009 Taiwan Department of Chemical and Materials Engineering Chung Cheng Institute of Technology National Defense University Taoyuan 335009 Taiwan System Engineering and Technology Program National Yang Ming Chiao Tung University Hsinchu 300093 Taiwan Department of Electronic Engineering Chien Hsin University of Science and Technology Taoyuan 320678 Taiwan Department of Material Engineering Ming Chi University of Technology New Taipei 243303 Taiwan Center for Plasma and Thin Film Technologies Ming Chi University of Technology New Taipei 243303 Taiwan Department of Criminal Investigation Taiwan Police College Taipei 116078 Taiwan

The forensic analysis of bloodstains on various substrates plays a crucial role in criminal investigations. This study presents a novel approach for analyzing bloodstains using Attenuated Total Reflectance Fourier Transform Infrared spectroscopy (ATR-FTIR) in combination with machine learning. ATR-FTIR offers non-destructive and non-invasive advantages, requiring minimal sample preparation. By detecting specific chemical bonds in blood components, it enables the differentiation of various body fluids. However, the subjective interpretation of the spectra poses challenges in distinguishing different fluids. To address this, we employ machine learning techniques. Machine learning is extensively used in chemometrics to analyze chemical data, build models, and extract useful information. This includes both unsupervised learning and supervised learning methods, which provide objective characterization and differentiation. The focus of this study was to identify human and porcine blood on substrates using ATR-FTIR spectroscopy. The substrates included paper, plastic, cloth, and wood. Data preprocessing was performed using Principal Component Analysis (PCA) to reduce dimensionality and analyze latent variables. Subsequently, six machine learning algorithms were used to build classification models and compare their performance. These algorithms comprise Partial Least Squares Discriminant Analysis (PLS-DA), Decision Trees (DT), Logistic Regression (LR), Naive Bayes Classifier (NBC), Support Vector Machine (SVM), and Neural Network (NN). The results indicate that the PCA-NN model provides the optimal solution on most substrates. Although ATR-FTIR spectroscopy combined with machine learning effectively identifies bloodstains on substrates, the performance of different identification models still varies based on the type of substrate. The integration of these disciplines enables researchers to harness the power of data-driven approaches for solving complex forensic problems. Th

关键词： ATR-FTIR Bloodstains Forensic investigations Machine learning Substrates

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Simulation-trained machine learning models for Lorentz transmission electron microscopy

APL Machine Learning

引用

APL Machine Learning 2024年第2期2卷

作者： Arthur R. C. McCray Alec Bender Amanda Petford-Long Charudatta Phatak Material Science Division Argonne National Laboratory Lemont Illinois 60439 USA Applied Physics Program Northwestern University Evanston Illinois 60208 USA Department of Materials Science and Engineering Northwestern University Evanston Illinois 60208 USA

Understanding the collective behavior of complex spin textures, such as lattices of magnetic skyrmions, is of fundamental importance for exploring and controlling the emergent ordering of these spin textures and inducing phase transitions. It is also critical to understand the skyrmion–skyrmion interactions for applications such as magnetic skyrmion-enabled reservoir or neuromorphic computing. Magnetic skyrmion lattices can be studied using in situ Lorentz transmission electron microscopy (LTEM), but quantitative and statistically robust analysis of the skyrmion lattices from LTEM images can be difficult. In this work, we show that a convolutional neural network, trained on simulated data, can be applied to perform segmentation of spin textures and to extract quantitative data, such as spin texture size and location, from experimental LTEM images, which cannot be obtained manually. This includes quantitative information about skyrmion size, position, and shape, which can, in turn, be used to calculate skyrmion–skyrmion interactions and lattice ordering. We apply this approach to segmenting images of Néel skyrmion lattices so that we can accurately identify skyrmion size and deformation in both dense and sparse lattices. The model is trained using a large set of micromagnetic simulations as well as simulated LTEM images. This entirely open-source training pipeline can be applied to a wide variety of magnetic features and materials, enabling large-scale statistical studies of spin textures using LTEM.

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Comparative analysis of the efficiency of gas grafting reaction of different types of Hanji with palmitoyl chloride

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2019年第3期51卷 90-97页

作者： Choi, Kyoung-Hwa Lee, Kwang Seob Lee, Jae-Hoon Lee, Myoung-Ku Ryu, Jeong-Yong Changgarig Institute of Paper Science and Technology Kangwon National University Chunchon24341 Korea Republic of Program of Paper Science and Engineering Division of Forest Material Science and Engineering College of Forest and Environmental Sciences Kangwon National University Chuncheon24341 Korea Republic of

This study was conducted to investigate the changes in the grafting efficiency of different types of Hanji, such as a raw materials and manufacturing methods varying different palmitoyl chloride concentrations and reaction temperatures. The results showed that the raw material of Hanji affected the grafting efficiency. The grafting efficiency of Hanji produced using the bast fiber of Edgeworthia chrysantha Lindl. was particularly excellent. Meanwhile, the amidation between anionic polyacrylamide (A-PAM) and palmitoyl chloride was speculated to occur in the case of Hanji at which A-PAM was added. However, the manufacturing process of Hanji had little influence on the graft reaction efficiency. The strength and brightness of all Hanji samples decreased via the gas grafting treatment, regardless of the kind of Hanji. The changes in the hydrophobicity, physical and optical properties of Hanji samples via gas grafting increased with the increasing palmitoyl chloride concentration and reaction temperature. © 2019 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Grafting (chemical)

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Artificial aging characteristics of hydrophobic hanjis grafted by gaseous palmitoyl chloride

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2019年第3期51卷 98-107页

作者： Choi, Kyoung-Hwa Lee, Kwang Seob Lee, Jae-Hoon Lee, Myoung-Ku Ryu, Jeong-Yong Changgang Institute of Paper Science and Technology Kangwon National University Chunchon24341 Korea Republic of Program of Paper Science and Engineering Division of Forest Material Science and Engineering College of Forest and Environmental Sciences Kangwon National University Chuncheon24341 Korea Republic of

This study was conducted to investigate the effects of gas grafting treatment on the durability of Korean traditional paper i.e., Hanji. Dry heating- and humid heating-accelerated aging tests were performed. Further, the properties of each Hanji sample, including strength, optical property, Cobb size degree, and static contact angle, were analyzed. The decrease in the strength and optical characteristics of the Hanji hydrophobized via gas grafting with palmitoyl chloride during artificial aging was found to be more significant than that of untreated paper. The decrease in durability was speculated to be caused by the residual free fatty acids in the Hanji. In contrast, no changes in the Cobb size and static contact angle of the hydrophobic Hanji occurred during accelerated aging. In summary, the hydrophobicity of Hanji grafted with palmitoyl chloride remained unchanged during 30 days of dry-heating aging and 60 days of humid-heating aging, however, the durability of paper material, including strength and optical properties, deteriorated. Therefore, the attenuation and elimination of residual free fatty acids must be investigated to prevent the decrease of durability. © 2019 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Grafting (chemical)

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Application of dry strength agents for the manufacture of low basis weight corrugating medium based on recycled aseptic carton fibers

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Palpu Chongi Gisul/Journal of Korea Technical Association of the Pulp and Paper Industry 2019年第3期51卷 13-22页

作者： Choi, Ji Seon Kim, Seon Yong Sim, Byul Lee, Kwang Seob Lee, Myoung Ku Ryu, Jeong Yong Program of Paper Science and Engineering Division of Forest Material Science and Engineering College of Forest and Environmental Sciences Kangwon National University Chuncheon24341 Korea Republic of Changgang Institute of Paper Science and Technology Kangwon National University Chunchon24341 Korea Republic of

Korean old corrugated containers (KOCC) have insufficient compressive strength because the bonding potential of the unsorted recovered fibers is poor. Compared to the nature of KOCC, the recovered aseptic carton is a high-quality resource produced from virgin pulp, which is expected to improve the strength of a testliner. In this study, the usage of recycled aseptic carton fibers was attempted to improve the strength properties of corrugating medium paper. In addition to recycled aseptic carton fibers, the application of a dry-strength agent was attempted to improve the bonding potential of fibers. Consequently, the compressive strength increased when the retention of fines in the mixed stock of KOCC and aseptic fibers increased. Meanwhile, aseptic carton comprised fibers with high stiffness and low flexibility;hence, the aseptic carton fibers exhibited a higher compressive strength than KOCC but did not fully manifest the efficiency of dry-strength agents. These results suggest that recycled aseptic carton fibers with or without beating should be used to obtain a sufficient compressive strength of the corrugating medium. The selective application of the dry-strength agent to the KOCC instead of the aseptic carton fibers may also be beneficial. © 2019 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

关键词： Compressive strength

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Unravelling Exothermic Reaction Dynamics in Polyurethane Polymerization: A Thermo-Kinetic Simulation Approach

SSRN

引用

SSRN 2023年

作者： Mendija, Leanne Christie C. Dingcong, Roger G. Alfeche, Fortia Louise Adeliene M. Al-Moameri, Harith H. Dumancas, Gerard G. Malaluan, Roberto M. Alguno, Arnold C. Lubguban, Arnold A. Center for Sustainable Polymers Mindanao State University Iligan Institute of Technology Iligan City9200 Philippines Material Science and Engineering Program Graduate School of Engineering Mindanao State University Iligan Institute of Technology Iligan City9200 Philippines Department of Materials Engineering Mustansiriyah University Baghdad10052 Iraq Department of Chemistry The University of Scranton ScrantonPA18510 United States Department of Chemical Engineering and Technology Mindanao State University Iligan Institute of Technology Iligan City9200 Philippines Department of Physics Mindanao State University Iligan Institute of Technology Iligan City9200 Philippines

The pursuit of sustainable polyurethane product development necessitates a profound understanding of precursor materials, particularly polyol since polyurethane properties are heavily influenced by the type of polyol employed during polyurethane production. While traditional polyurethanes are solely derived from hydroxyl functionalized polyols, the emergence of amine-hydroxyl hybrid polyols has garnered significant attention due to their potential for enhancing polyurethane product properties. These hybrid polyols are characterized by the presence of both amine and hydroxyl functional groups. However, characterizing these polyols remains a daunting challenge due to the lack of established experimental testing standards for properties, such as fractional hydroxyl and amine moieties, and thermo-kinetic parameters for amine reactions with isocyanates. To bridge these gaps, this study employed a computational simulation approach to determine the fractions of moieties in both traditional and hybrid polyols. Additionally, this study determined the thermo-kinetic parameters for exothermic isocyanate reactions with amine moieties in hybrid polyols. The computational method integrated energy balance and reaction kinetics analysis for various polyols to elucidate the influence of functional moieties on the thermo-kinetic behavior of polyurethane formations. Validation of the simulated results was conducted by comparing their experimental and simulated gel and foam temperature profiles, highlighting the direct influence of fractional moieties on polyurethane formations. The comparisons revealed an average relative error of less than 5%, indicating the accuracy and credibility of the simulation. Thus, this study represents a pivotal opportunity for advancing knowledge and driving sustainable developments in biobased polyol characterization for polyurethane production streamlining and formulation optimization. © 2023, The Authors. All rights reserved.

关键词： Polymerization

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Modeling of V graded In(x)Ga(1-x)N solar cells: comparison of strained and relaxed features

arXiv

引用

arXiv 2022年

作者： Sarollahi, Mirsaeid Alavijeh, Mohammad Zamani Aldawsari, Manal A. Allaparthi, Rohith Alhelais, Reem Refaei, Malak A. Maruf, Md. Helal Uddin Ware, Morgan E. University of Arkansas Electrical Engineering Department 3217 Bell Engineering Center FayettevilleAR72701 United States University of Arkansas Microelectronics-Photonics Program 731 West Dickson Street FayettevilleAR72701 United States University of Arkansas Material Science and Engineering 731 West Dickson Street FayettevilleAR72701 United States Institute for Nanoscience and Engineering FayettevilleAR72701 United States University of Arkansas Physics Department FayettevilleAR72701 United States

The optical properties of Λ graded InGaN solar cells are studied. Graded InGaN well structures with the indium composition increasing then decreasing in a Λ shaped pattern have been designed. Through polarization doping, this naturally creates alternating p-type and n-type regions. Separate structures are designed by varying the indium alloy profile from GaN to maximum indium concentrations ranging from 20% to 80%, while maintaining a constant overall structure thicknesses of 100 nm. The solar cell parameters under fully strained and relaxed conditions are considered. The results show that a maximum efficiency of ≅ 5.5%, under fully strained condition occurs at x=60%. Solar cell efficiency under relaxed conditions increases to a maximum of 8.3% at 90%. While Vegard’s law predicts the bandgap under relaxed conditions, a Vegard-like law is empirically determined from the output of Nextnano for varying In compositions in order to calculate solar cell parameters under strain. © 2022, CC BY.

关键词： Solar cells

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Study on Ag(I) Loaded ZIF-8 and Ag(I) Ion Release in Artificial Seawater

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materials 2023年第5期16卷 2040页

作者： Tsai, Shang-Tien Tang, Wei-Cheng Wei, Yeu-Kuen Wu, Kevin C.-W. Program of Green Materials and Precision Devices National Taiwan University Taipei10617 Taiwan Material and Chemical Research Laboratories Industrial Technology Research Institute Hsinchu30011 Taiwan Department of Chemical Engineering National Taiwan University Taipei10617 Taiwan Institute of Biomedical Engineering & Nanomedicine National Health Research Institutes 35 Keyan Road Miaoli35053 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan32003 Taiwan Yonsei Frontier Lab Yonsei University 50 Yonsei-ro Seoul03722 Korea Republic of

From a porous structure perspective, the one-stage de novo synthesis method and impregnation method were applied to synthesize Ag(I) ion-containing ZIF-8 samples. With the de novo synthesis method, Ag(I) ions could be located inside micropores or adsorbed on the external surface of the ZIF-8 by selecting AgNO3 in water or Ag2CO3 in ammonia solution as precursors, respectively. The ZIF-8 confining Ag(I) ion exhibited a much lower constant releasing rate than the Ag(I) ion adsorbed on the ZIF-8 surface in artificial seawater. As such, strong diffusion resistance in association with the confinement effect is contributed by ZIF-8’s micropore. On the other hand, the release of Ag(I) ions adsorbed on the external surface was diffusion limited. Therefore, the releasing rate would reach a maximum not increasing with Ag(I) loading in the ZIF-8 sample. © 2023 by the authors.

关键词： Ions

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