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Real-Time In Situ Spectroscopic and Electrochemical Analysis of Ion-Water-Polymer Interactions at Functionalized PEDOT Interfaces

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Analytical chemistry 2025年第22期97卷 2025 May 25页

作者： Chia-Hsin Lin Ya-Chen Gong Hsuan-Yu Chen Heng-Liang Wu Shyh-Chyang Luo Department of Materials Science and Engineering National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan. Center for Condensed Matter Sciences and Center of Atomic Initiative for New Materials National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan. International Graduate Program of Molecular Science and Technology National Taiwan University Taipei 10617 Taiwan.

Understanding water dynamics at material interfaces is crucial for applications in biotechnology, electrochemistry, and energy systems. In this study, we employed Fourier transform infrared spectroscopy and electrochemical quartz crystal microbalance with dissipation monitoring to investigate the hydration states and ion interactions of functionalized poly(3,4-ethylenedioxythiophene) (PEDOT) films. By applying controlled potentials, we monitored ion absorption and desorption while using Gaussian fitting to analyze the O-H stretching bands. Our results revealed that sulfate ions (SO) compete with water molecules at PEDOT interfaces with hydroxyl groups, whereas perchlorate ions (ClO) exhibit minimal interference due to their weak water interactions. For PEDOT functionalized with zwitterionic phosphorylcholine groups, higher levels of intermediate water and nonfreezing water mitigated dehydration in saline environments. This work highlights the synergy between electrochemical and spectroscopic methods for real-time analysis of ion-water-polymer interactions, providing critical insights into interfacial phenomena regulated by applied potential.

关键词： Electrolytic analysis

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Incorporating Sulfur Atoms into Palladium Catalysts by Reactive Metal–Support Interaction for Selective Hydrogenation

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CCS Chemistry 2022年第9期4卷 3051-3063页

作者： Zhen-Yu Wu Hang Nan Shan-Cheng Shen Ming-Xi Chen Hai-Wei Liang Chuan-Qi Huang Tao Yao Sheng-Qi Chu Wei-Xue Li Shu-Hong Yu Division of Nanomaterials and Chemistry Hefei National Laboratory for Physical Sciences at the MicroscaleCAS Center for Excellence in NanoscienceInstitute of EnergyHefei Comprehensive National Science CenterDepartment of ChemistryInstitute of Biomimetic Materials and ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsUniversity of Science and Technology of ChinaHefei 230026 Hangzhou Institute of Advanced Studies Zhejiang Normal UniversityHangzhouZhejiang 311231 National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230026 Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049 Department of Chemical Physics School of Chemistry and Materials ScienceiCHeMCAS Center for Excellence in NanoscienceHefei National Laboratory for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026

Developing highly active and selective catalysts for the hydrogenation of nitroarenes,an environmentally benign process to produce industrially important aniline intermediates,is highly desirable but very *** catalysts are generally recognized as active but nonselective catalysts for this important ***,we report an effective strategy to greatly improve the selectivity of Pd catalysts based on the reactive metal–support interaction.

关键词： incorporating sulfur atoms palladium catalysts reactive metal–support interaction hydrogenation density functional theory calculations

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Development of Flexible Sendust Composite Sheets with Enhanced Magnetic Permeability for Microwave Absorbers and Antennas

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IEEE Transactions on Magnetics 2025年

作者： Whalen, Matthew P. Plouff, David T. Shevchenko, Nicholas B. Mirotznik, Mark Xiao, John Q. University of Delaware Quantum Science and Engineering Program NewarkDE19716 United States University of Delaware Department of Physics and Astronomy NewarkDE19716 United States University of Delaware Center for Composite Materials NewarkDE19716 United States University of Delaware Department of Electrical and Computer Engineering NewarkDE19716 United States

The demand for high-frequency soft magnetic composites with elevated permeability and flexibility is growing for applications in microwave absorbers and magnetodielectric antennas. However, balancing high permeability with mechanical flexibility remains challenging. This study presents flexible Sendust (FeSiAl) composite sheets, fabricated with a hot-pressing technique that aligns flakes within an acrylic rubber and epoxy resin matrix. The alignment significantly enhances relative permeability at high frequencies, achieving single-layer film properties of μr' = 14.8 and μr"= 20.4 at 1 GHz, alongside high saturation magnetization (118 eμg) and high hesitivity (44.7 kΩ m-1), outperforming commonly used materials such as NiZn ferrite. Our method supports customizable thickness without sacrificing permeability, establishing a versatile platform for advanced conformal microwave absorber and antenna applications. © 2025 IEEE.

关键词： Saturation magnetization

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Achieving Near-Intrinsic Exciton Linewidth at Room Temperature in Monolayer WS2 Coupled with a Mie Resonator

Achieving Near-Intrinsic Exciton Linewidth at Room Temperatu...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Jie Fang Kan Yao Yuebing Zheng Materials Science & Engineering Program and Texas Materials Institute The University of Texas at Austin Austin TX USA Walker Department of Mechanical Engineering The University of Texas at Austin Austin TX USA

Strong multiparticle interactions at room temperature (RT) lead to broadened homogeneous exciton linewidths in 2D semiconductors, degrading the quality of excitonic mode and emission. By coupling a Mie resonator with ... 详细信息

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Couplings Laser theory Excitons Semiconductor lasers Kelvin Lasers and electrooptics Laser modes

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Direct observation of oxygen polarization in Sr2IrO4 by O K-edge x-ray magnetic circular dichroism

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Physical Review B 2023年第20期107卷 L201122-L201122页

作者： R. Kadono M. Miyazaki M. Hiraishi H. Okabe A. Koda K. Amemiya H. Nakao Muon Science Laboratory Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) Tsukuba Ibaraki 305-0801 Japan Muroran Institute of Technology Muroran Hokkaido 050-8585 Japan Graduate School of Science and Engineering Ibaraki University Bunkyo Mito Ibaraki 310-8512 Japan Institute for Materials Research (IMR) Tohoku University Katahira Aoba-ku Sendai 980-8577 Japan Department of Materials Structure Science Graduate University for Advanced Studies Tsukuba Ibaraki 305-0801 Japan Photon Factory Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) Tsukuba Ibaraki 305-0801 Japan

X-ray absorption spectroscopy (XAS) and magnetic circular dichroism (XMCD) measurements at the oxygen (O) K edge were performed to investigate the magnetic polarization of ligand O atoms in the weak ferromagnetic (WFM) phase of the Ir perovskite compound Sr2IrO4. With the onset of the WFM phase below TN≃240 K, XMCD signals corresponding to XAS peaks respectively identified as originating from the magnetic moments of apical and planar oxygen (OA and OP) in the IrO6 octahedra were observed. The observation of magnetic moments at OA sites is consistent (except for the relative orientation) with that suggested by prior muon spin rotation (µSR) experiment in the noncollinear antiferromagnetic (NC-AFM) phase below TM≈100 K. Assuming that the OA magnetic moment observed by µSR is also responsible for the corresponding XMCD signal, the magnetic moment of OP is estimated to be consistent with the previous µSR result. Since the OA XMCD signal is mainly contributed by Ir 5dzx and yz orbitals which also hybridize with OP, it is inferred that the relatively large OP magnetic moment is induced by Ir 5dxy orbitals. Moreover, the inversion of OA moments relative to Ir moments between the two magnetic phases revealed by XMCD suggests the presence of competing magnetic interactions for OA, with which the ordering of OA moments in the NC-AFM phase may be suppressed to TM.

关键词： Magnetic order Magneto-dielectric effect Strongly correlated systems X-ray absorption spectroscopy X-ray magnetic circular dichroism

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Long-range order of polygonal grain boundaries

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Physical Review B 2025年第4期111卷 045103-045103页

作者： N. Sarkar P. R. Bandaru R. C. Dynes Department of Mechanical Engineering University of California San Diego La Jolla California 92093-0411 USA Program in Materials Science University of California San Diego La Jolla California 92093-0411 USA Department of Physics University of California San Diego La Jolla California 92093-0411 USA

Atomic-scale spatial resolution was achieved in the mapping and spectroscopy of polygonal grain boundaries (GBs) on atomically flat highly oriented pyrolytic graphite using scanning tunneling microscopy (STM). These GBs are long-range ordered one-dimensional periodic structures comprising pentagon-heptagon pairs. A comprehensive study combining local electronic, valleytronic, mechanical, and topological properties is conducted on this GB which reveals the interplay between these properties. On the atoms and bonds of individual GB polygons, spatially localized conductance states were probed, in addition to edge states. The spatial extent of these states was observed on GB by bias-dependent imaging. The electron scattering angle at the GB edges was also modulated with a sample bias which exhibited valley flipping and unique quantum interference effects such as backscattering and intervalley scattering. In situ strain-induced mechanical and electronic modifications were observed through surface deformation caused by the STM tip, revealing flattened electronic energy band dispersion and shifts in carrier doping.

关键词： Grain boundaries

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Constructing Passivation Film on Plain Carbon Steel Similar to that on 316l Stainless Steel

SSRN

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SSRN 2023年

作者： An, Hongze Yuan, Hengyi Fan, Meiqing Lei, Bing Feng, Zhiyuan Guo, Honglei Zhang, Ping Wang, Jun Yang, Xiaodong Meng, Guozhe Zhang, Bin Institute of Petrochemistry Heilongjiang Academy of Sciences Harbin150040 China Institute for Interdisciplinary Biomass Functional Materials Studies Jilin Provincial Key Laboratory of Straw-Based Functional Materials Jilin Engineering Normal University Changchun130052 China Marine Corrosion and Surface Engineering Team School of Chemical Engineering and Technology Sun Yat-sen University Zhuhai519082 China Department of Civil and Environmental Engineering Faculty of Science and Technology University of Macau Taipa China Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin150001 China

A high corrosion-resistant passivation film with cerium-molybdenum-chromium-nickel ions has been synthesized on plain carbon steel rebar through a chemical transformation method which significantly lowered the pitting susceptibility of the rebar in the chloride-containing concrete environment. The results indicated that the prepared film has a re-passivation self-healing property in a concrete environment with a concentration of 0.1 M NaCl, which is similar to the behavior of 316L stainless steel. The charge transfer resistance increased markedly with the extension of immersion time, reaching 3.70 × 106 Ω·cm2 in about 1500 h of immersion (about 10 times of the initial Rt value). The high corrosion resistance mechanism of the film was discussed here in depth. © 2023, The Authors. All rights reserved.

关键词： Corrosion resistance

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New Insights into the Effects of Solidification Process on The Thermodynamic Parameters and Mechanical Properties of Cualbenbni Shape Memory Alloy

SSRN

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SSRN 2023年

作者： Silva, David D.S. Vieira, Rafael T. Falcão, Gabriely M.S. Brito, Ieverton C.A. Caluête, Rafael E. Gomes, Rodinei M. Oliveira, Danniel F. Federal University of São Carlos Graduate Program in Materials Science and Engineering SP São Carlos13565-905 Brazil Colorado School of Mines George S. Ansell Department of Metallurgical and Materials Engineering GoldenCO80401 United States Federal University of Paraíba Graduate Program in Materials Science and Engineering PB João Pessoa58051-900 Brazil Federal University of Paraíba Department of Materials Engineering PB João Pessoa58051-900 Brazil Federal University of Paraíba Department of Mechanical Engineering PB João Pessoa58051-900 Brazil

In this work, the influence of the solidification process on the microstructure, thermodynamic parameters and mechanical properties of CuAlBeNbNi shape memory alloy (SMA) was investigated. While directional solidification has been used to improve functional properties in Cu-based SMAs, the squeeze casting process has not yet been explored. The results indicate that the processes of unidirectional solidification and squeeze casting offer an alternative method to modify the thermodynamic parameters, mechanical properties, and microstructural properties of the CuAlBeNbNi SMA while keeping the composition constant. This study aims to fill the knowledge gap regarding the impact of solidification processes on the properties of Cu-based SMAs, specifically investigating CuAlBeNbNi SMAs. © 2023, The Authors. All rights reserved.

关键词： Microstructural evolution

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The technology of rob water treatment becomes clean water by using the combination of electrolysis, filtration, and ozonation methods 10

The technology of rob water treatment becomes clean water by...

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10th International Seminar on New Paradigm and Innovation of Natural sciences and itsApplication, ISNPINSA 2020

作者： Wahyono, Y. Nofanda, T.T. Budiyanto, I. Nugroho, H. Rosyad, M.S. Halim, M.A.R. Riski, I. Amilia, A. Rahmawati, D.F. Nurauliyaa, A.H. Baihaqi, R.A. Syafira, F. Lestari, P. Doctoral Program of Environmental Science School of Postgraduate Studies Diponegoro University Indonesia Department of Physics Faculty of Science and Mathematics Diponegoro University Indonesia Department of Mathematics Faculty of Science and Mathematics Diponegoro University Indonesia Department of Chemistry Faculty of Science and Mathematics Diponegoro University Indonesia Department of Chemical Engineering Faculty of Engineering Diponegoro University Indonesia

Coastal residents have difficulty in fulfilling the needs of clean water due to tidal water and tidal water intrusion. Meanwhile, clean water is a crucial component in carrying out activities of daily life. This initiative aims to provide an alternative solution in the form of technology to treat water polluted by saline water into clean water. This initiative used the method of electrolysis, filtration, and ozonation. Electrolysis has functions to remove salt contained and reduce levels of heavy metals while filtration functions to filter out the impurities in the form of solid particles, and ozonation takes a role to kill bacteria. Moreover, the target output of this work is the creation of a prototype by using this technology as a technology that can treat water polluted by saline water into clean water. The parameters assessed from this initiative are physical, chemical, and biological parameters of clean water. The results of the total test of dissolved solids of water before processing were 7130 ppm while it was 2490 ppm after getting treatment. The decreasing total value of dissolved solids is 65.077%, which indicates that the test was successful. The result of an electrical conductivity test of water before processing is 310 mA while after processing is 88.6 mA. The decrease in the current value of 71.419% indicates that the test was successful. The results of the turbidity test of water before processing are 0 FAU while after getting treatment is 0 FAU. The turbidity value remains 0, which indicates the test was successful. The results of the pH test of water before processing were 5.7 while the result after treatment got 6.1. The increase in pH value towards pH 7 (neutral) indicates that the test was successful. The test results of salt and heavy metals (Fe, Cu, Cl, Na, and Pb) of water before processing were 0.073 ppm, 0.07 ppm, 0.17 ppm, 0.04 ppm, and 4.24 ppm while after processing was 0 ppm, 0 ppm, 0.07 ppm, 0.03 ppm, and 1.36 ppm. There was a decrease

关键词： Ozonization

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Efficient synthesis method of CsPbBr3/Al2O3 composite powders for scalable production: Augmented green emission and thermal stability

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Journal of Industrial and engineering Chemistry 2025年

作者： Kim, Seok-Hun Shin, Weon Ho Oh, Jong-Min Kim, Sang-Wook Kim, Sunghoon Center for Brain Busan 21 Plus Program Dong-Eui University Busan47340 Korea Republic of Department of Electronic Materials Engineering Kwangwoon University Seoul01897 Korea Republic of Department of Molecular Science and Technology Ajou University Suwon16499 Korea Republic of

Metal halide perovskites (MHPs) have gained significant attention for their exceptional optoelectronic properties, particularly in displays. However, their practical utility is severely limited by their intrinsic instability, including poor thermal stability, photostability, and susceptibility to moisture-induced degradation. This study introduces scalable synthesis of CsPbBr3/Al2O3 green-emitting phosphors, using submicron Al2O3 as a support, comparing mechanochemical reaction (MRM) and dissolution-evaporation (DEM) methods. DEM is the optimal route, enabling the formation of monoclinic CsPbBr3/Al2O3 with high photoluminescence quantum yield (PLQY) and enhanced stability. The influence of the CsPbBr3 to Al2O3 mass ratio on PLQY was quantitatively analyzed using the Halder-Wagner method, which indirectly calculated crystallite size and its correlation with PLQY. The composite demonstrated exceptional thermal stability, maintaining over 90 % of its initial PL intensity after 200 °C exposure for 15 days and showed excellent photostability, maintaining nearly its initial luminous efficiency under the currents of 20 mA and 70 mA for 10000-seconds. When integrated as a green phosphor in a white LED package with K2SiF6:Mn+4 as a red phosphor, it achieved a luminous efficiency of 25 lm W−1 and a color gamut of 112.4 % NTSC. These results highlight the potential of CsPbBr3/Al2O3 composites for cost-effective, stable, and high-performance optoelectronic applications. © 2025 The Korean Society of Industrial and engineering Chemistry

关键词： Perovskite

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