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arXiv 2024年

作者： Lin, Linhan Lepeshov, Sergey Krasnok, Alex Huang, Yu Jiang, Taizhi Peng, Xiaolei Korgel, Brian A. Alu, Andrea Zheng, Yuebing State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua University Beijing100084 China Department of Electrical and Photonics Engineering DTU Electro Technical University of Denmark Building 343 Kgs. LyngbyDK-2800 Denmark Department of Electrical and Computer Engineering Florida International University MiamiFL33174 United States School of Physics and Electronics Hunan University Changsha410082 China Mc Ketta Department of Chemical Engineering The University of Texas at Austin AustinTX78712 United States Materials Science & Engineering Program Texas Materials Institute The University of Texas at Austin AustinTX78712 United States Department of Electrical and Computer Engineering The University of Texas at Austin AustinTX78712 United States Advanced Science Research Center City University of New York New YorkNY10031 United States Physics Program Graduate Center City University of New York NY10016 United States Walker Department of Mechanical Engineering The University of Texas at Austin AustinTX78712 United States

Fano resonances in photonics arise from the coupling and interference between two resonant modes in structures with broken symmetry. They feature an uneven and narrow and tunable lineshape, and are ideally suited for optical spectroscopy. Many Fano resonance structures have been suggested in nanophotonics over the last ten years, but reconfigurability and tailored design remain challenging. Herein, we propose an all-optical "pick-and-place" approach aimed at assemble Fano metamolecules of various geometries and compositions in a reconfigurable manner. We study their coupling behavior by in-situ dark-field scattering spectroscopy. Driven by a light-directed opto-thermoelectric field, silicon nanoparticles with high quality-factor Mie resonances (discrete states) and low-loss BaTiO3 nanoparticles (continuum states) are assembled into all-dielectric heterodimers, where distinct Fano resonances are observed. The Fano parameter can be adjusted by changing the resonant frequency of the discrete states or the light polarization. We also show tunable coupling strength and multiple Fano resonances by altering the number of continuum states and discrete states in dielectric heterooligomers. Our work offers a general design rule for Fano resonance and an all-optical platform for controlling Fano coupling on demand. Copyright © 2024, The Authors. All rights reserved.

关键词： Light polarization

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Comparative Study of Photocatalytic H2 Production by Nickel Chalcogenides1+x Based Zn3In2S6 Photocatalytic System

SSRN

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SSRN 2024年

作者： Mansoor, Seemal Hu, Zixu Zheng, Yifan Tayyab, Muhammad Khan, Mazhar Akmal, Zeeshan Zhou, Liang Lei, Juying Zhang, Jinlong Key Laboratory for Advanced Materials Shanghai Engineering Research Center for Multi-media Environmental Catalysis and Resource Utilization Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Center School of Chemistry and Molecular Engineering East China University of Science & Technology Shanghai200237 China National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process East China University of Science and Technology 130 Meilong Road Shanghai200237 China Department of Molecular Engineering Graduate School of Engineering Kyoto University Kyoto-Daigaku Katsura Nishikyo-ku Kyoto615-8510 Japan State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Harbin150090 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China Institute of Materials Research Tsinghua Shenzhen International Graduate School Tsinghua University Guangdong Shenzhen518055 China

Exploiting metal chalcogenide-based photocatalysts has fascinated researchers as a source of green hydrogen (H2) energy. Herein, we have designed a novel selenium-enriched NiSe1+x/ZIS (NiSexZ) photocatalytic system via a two-step hydrothermal and facile photo-deposition method. It was fascinating to conclude here that the NiSexZ photocatalytic system showed boosted H2 evolution results in comparison with other sulphur-enriched NiS1+x/ZIS (NiSxZ) and tellurium-enriched NiTe1+x/ZIS (NiTexZ). The optimized NiSe0.5Z composite exhibited a photocatalytic H2 evolution of 3.24 mmol g -1 h -1, a 9.8-fold increase over pure ZIS and it demonstrated an apparent quantum efficiency (AQE) of 2.06% via 420nm filter. Moreover, sulphur (S), selenium (Se), and tellurium (Te) synergistic active sites were exposed to promote H2 evolution reaction in this work. Given the significant advancements and commendable performance exhibited by the Se-Hads across the week bond, it is extremely probable that the NiSe1+x cocatalyst holds immense potential for the development of sophisticated photocatalytic materials. © 2024, The Authors. All rights reserved.

关键词： Nickel compounds

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Outcoupling Hyperbolic Modes from Aligned Carbon Nanotube Films

Outcoupling Hyperbolic Modes from Aligned Carbon Nanotube Fi...

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CLEO: QELS_Fundamental science, QELS 2022

作者： Jerome, Bryant Prasad, Ciril S. Doumani, Jacques Dewey, Oliver S. Baydin, Andrey Pasquali, Matteo Kono, Junichiro Gao, Weilu Alabastri, Alessandro Naik, Gururaj V. 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 Chemical and Biomolecular Engineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Chemistry Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Electrical and Computer Engineering University of Utah Salt Lake CityUT84112 United States

Aligned carbon nanotube films make an excellent hyperbolic material platform in the infrared. Here, we experimentally demonstrate the presence of high-k modes in aligned carbon nanotube films and outcouple them to fre... 详细信息

ISBN: (纸本)9781557528209

关键词： Carbon films

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Catharanthus roseus-mediated CuAl2O4 nanocomposites for evaluation of killing kinetics

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Chemosphere 2024年 359卷 142369页

作者： Potbhare, Ajay K. Yerpude, Sachin Daddemal-Chaudhary, Ankita R. Lambat, Ashish Mondal, Aniruddha Dadure, Kanhaiya M. Rai, Alok R. Abdala, Ahmed Chaudhary, Ratiram G. Department of Chemistry S. K. Porwal College of Arts and Science and Commerce Kamptee441001 India Department of Microbiology S. K. Porwal College of Arts and Science and Commerce Kamptee441001 India Lady Amritabai Daga College for Women of Arts Commerce and Science Nagpur440010 India Post Graduate Teaching Department of Botany RTM Nagpur University Nagpur440033 India Department of Biology Sevadal Mahila Mahavidyalaya Nagpur India Division of Materials Science Lulea University of Technology Lulea97187 Sweden Department of Chemistry Bajaj College of Science Wardha India Chemical Engineering Program Texas A&M University at Qatar Doha Qatar

The present article portrayed on the killing kinetic of human pathogenic bacteria using bioinspired mesoporous CuAl2O4 nanocomposites (NCs). The NCs was fabricated using leaf extract of medicinal plant Catharanthus roseus (CR) as a green reducer and stabilizer. As bio-fabricated material was calcined at 800 °C and characterized by several analytical techniques like X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Ultraviolet–Visible Diffuse Reflectance Spectroscopy (UV-DRS), Energy Dispersive X-Ray Spectroscopy (EDS), X-Ray Photoelectron Spectroscopy (XPS), Raman, Brunauer-Emmett-Teller (BET), Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM) to authenticate its structure, phase, chemical bonding, chemical state, size and morphology behaviors. XRD and TEM revealed a reduced crystallite and nanoscale sizes of biosynthesized NCs. Moreover, XRD study exposed a cubic-structure of material, while transmission electron microscopy rendered an average particles size in range 10–15 nm. However, BET profile advocates a mesoporous nature of the particles. An effective biological molecular docking modulation assessed by substituting natural inhibitor by bioinspired NCs, while the protein PDB ID 4Z8D FabH as a receptor site for the present investigation. After assessment of molecular docking examination, the antibacterial activity of bioinspired NCs were performed against Staphylococcus aureus, Bacillus subtillis, Klebsiella pneumoniae and Escherichia coli using agar-well method. The broth culture method was employed on different pathogenic strains by kinetic growth assays and colony forming unit. © 2024 Elsevier Ltd

关键词： Nanocomposites

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Magnetically Reusable Ce-Mof/Go/Fe3o4 Composite for Effectively Photocatalytic Degradation of Chlortetracycline

SSRN

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SSRN 2022年

作者： Bai, Yuting Hao, Derek Feng, Sisi Lu, Liping Wang, Qi Institute of Molecular Science Key Laboratory of Chemical Biology and Molecular Engineering of the Education Ministry Shanxi University Shanxi Taiyuan030006 China Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province Shanxi University Shanxi Taiyuan030006 China Department of Energy Chemistry and Materials Engineering Shanxi Institute of Energy Shanxi Jinzhong030600 China School of Environmental Science and Engineering Zhejiang Gongshang University Hangzhou310018 China SydneyNSW2007 Australia

Chlortetracycline (CTC) is a widely used tetracycline antibiotic. However, the released CTC has become a manifest water pollutant. Herein, we report a ternary composite based on Ce(BTB)(H2O) (1, H3BTB = 1,3,5-benzenetrisbenzoic acid), graphene oxide (GO), and iron oxide (Fe3O4), denoted as 1/GO/Fe3O4. In the composite, GO is used as the carrier to carry Fe3O4, and 1 as the active component is grafted onto magnetic GO. The addition of GO can accelerate electron migration and inhibit photoelectron-hole recombination. More importantly, the light absorption is also extended from the ultraviolet to the visible region. The ternary composite with H2O2 shows remarkable photocatalytic degradation activity of CTC. Compared with pure 1, the photocatalytic activity of the optimized composite improved by 5.4 times. Furthermore, 1/GO/Fe3O4 can be quickly recycled under an applied magnetic field and displayed outstanding stability and reusability. According to the radical trapping experiments and electron paramagnetic resonance results, hydroxyl radicals, superoxide radicals, and holes all contribute to the excellent photocatalytic activity. The possible catalytic mechanism of 1/GO/Fe3O4 is tentatively proposed. This work aims to explore the synergistic effect between metal-organic frameworks (MOFs) and GO, and provide a theoretical basis for MOFs-based composites to remove antibiotic contaminants in the environment. © 2022, The Authors. All rights reserved.

关键词： Magnetite

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Addressing challenges for operating electrochemical solar fuels technologies under variable and diurnal conditions

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Frontiers in Energy Research 2024年 12卷

作者： Yap, Kyra M. K. Lee, Sol A. Kistler, Tobias A. Collins, Darci K. Warren, Emily L. Atwater, Harry A. Jaramillo, Thomas F. Xiang, Chengxiang Nielander, Adam C. Department of Chemical Engineering Stanford University StanfordCA United States SUNCAT Center for Interface Science and Catalysis SLAC National Accelerator Laboratory Menlo ParkCA United States Department of Applied Physics and Materials Science California Institute of Technology PasadenaCA United States Chemical Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA United States Chemistry and Nanoscience Center National Renewable Energy Laboratory GoldenCO United States Advanced Energy Systems Graduate Program Colorado School of Mines GoldenCO United States

The outdoor operation of electrochemical solar fuels devices must contend with challenges presented by the cycles of solar irradiance, temperature, and other meteorological factors. Herein, we discuss challenges associated with these fluctuations presented over three timescales, including the effects of diurnal cycling over the course of many days, a single diurnal cycle over the course of hours, and meteorological phenomena that cause fluctuations on the order of seconds to minutes. We also highlight both reaction-independent and reaction-specific effects of variable conditions for the hydrogen evolution reaction and CO2 reduction reaction. We identify key areas of research for advancing the outdoor operation of solar fuels technology and highlight the need for metrics and benchmarks to enable the comparison of diurnal studies across systems and geographical locations. Copyright © 2024 Yap, Lee, Kistler, Collins, Warren, Atwater, Jaramillo, Xiang and Nielander.

关键词： Hydrogen fuels

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Design of light- and chemically responsive protein assemblies through host-guest interactions

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Chem 2025年第6期11卷

作者： Zhang, Zhiyin Chiang, Huat T. Xia, Ying Avakyan, Nicole Sonani, Ravi R. Wang, Fengbin Egelman, Edward H. De Yoreo, James J. Pozzo, Lilo D. Tezcan, F. Akif Department of Chemistry and Biochemistry University of California San Diego La Jolla San Diego 92093 CA United States Department of Chemical Engineering University of Washington Seattle 98195 WA United States Department of Materials Science and Engineering University of Washington Seattle 98195 WA United States Department of Biochemistry and Molecular Genetics University of Virginia Charlottesville 22903 VA United States Department of Biochemistry and Molecular Genetics University of Alabama Birmingham 35294 AL United States Computational Sciences Directorate Pacific Northwest National Laboratory Richland 99354 WA United States

Host-guest (HG) interactions have been widely used to build responsive materials and molecular machines owing to their inherently dynamic nature, interaction specificity, and responsiveness to diverse stimuli. Here, we have set out to exploit these advantages of HG chemistry in the design of dynamic protein assemblies, using a C₄ symmetric protein, ^C98RhuA, as a building block. We show that a ^C98RhuA variant individually modified with β-cyclodextrin (βCD) (host) or azobenzene (guest) functionalities can specifically pair with each other to form highly ordered 1D and 2D assemblies. Association and dissociation of ^βCDRhuA-^azoRhuA assemblies can be controlled by UV and visible light as well as by small-molecule modulators of βCD-azobenzene interactions. Kinetics analyses reveal that ^βCDRhuA-^azoRhuA nanotubes assemble without a nucleation barrier, a highly unusual occurrence for helical supramolecular systems. Taken together, our findings provide a compelling example for achieving complex structural and dynamic outcomes in protein assembly through simple chemical design. © 2024 Elsevier Inc.

关键词： barrierless growth chemical response host-guest interactions light response nanotubular assemblies protein self-assembly SDG9: Industry, innovation, and infrastructure supramolecular chemistry

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Temperature Dependent Spin-Phonon Coupling of Boron-Vacancy Centers in Hexagonal Boron Nitride

arXiv

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arXiv 2024年

作者： Liu, Zhongyuan Gong, Ruotian Huang, Benchen Jin, Yu Du, Xinyi He, Guanghui Janzen, Eli Yang, Li Henriksen, Erik Edgar, James Galli, Giulia Zu, Chong Department of Physics Washington University St. LouisMO63130 United States Department of Chemistry University of Chicago IL60637 United States Tim Taylor Department of Chemical Engineering Kansas State University ManhattanKS66506 United States Pritzker School of Molecular Engineering University of Chicago IL60637 United States Material Science Division Argonne National Lab IL60439 United States Center for Quantum Leaps Washington University St. LouisMO63130 United States Institute of Materials Science and Engineering Washington University St. LouisMO63130 United States

The negatively charged boron-vacancy center (VB−) in hexagonal boron nitride (hBN) has recently emerged as a highly promising quantum sensor. Compared to the nitrogen-vacancy (NV) center in diamond, the change with temperature of the spin transition energy of VB− is more than an order of magnitude larger, making it a potential nanoscale thermometer with superior sensitivity. However, the underlying mechanism of the observed large temperature dependence remains an open question. In this work, using isotopically purified h10B15N, we systematically characterize the zero-field splitting, hyperfine interaction, and spin relaxation time of VB− from 10 to 350 K. We carry out first-principle calculations of the VB− spin-phonon interaction and show that a second-order effect from finite-temperature phonon excitations is responsible for the observed changes in experiments. By fitting our experimental results to a physically motivated model, we extract the dominant phonon mode which agrees well with our simulations. Finally, we investigate the dynamic nuclear spin polarization process at cryogenic temperatures. Our results provide key insights in VB− centers and their utilization as nanoscale thermometers and phonon sensors. Copyright © 2024, The Authors. All rights reserved.

关键词： Spin polarization

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Rh-doped PdAg nanoparticles as efficient methanol tolerance electrocatalytic materials for oxygen reduction

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science Bulletin 2019年第1期64卷 54-62页

作者： Yingjun Sun Bolong Huang Nuoyan Xu Yingjie Li Mingchuan Luo Chunji Li Yingnan Qin Lei Wang Shaojun Guo Department of Materials Science & Engineering College of Engineering Peking University College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University BIC-ESAT College of Engineering Peking University Department of Energy and Resources Engineering College of Engineering Peking University

Direct methanol fuel cells(DMFCs)have received extensive attention on their high efficiency,high reliability,and no carbon ***,the poor methanol tolerance and sluggish oxygen reduction reaction(ORR)at cathode have seriously hindered their further *** we report the synthesis of a new class of Rh-doped PdAg alloy nanoparticles(NPs)for boosting ORR activity with high methanol tolerance capacity *** ORR mass activity of typical Rh_4Pd_(40)Ag_(56)NPs is 4.2 times higher than that of commercial Pt ***,it shows a great methanol tolerance capability by maintaining 92.4%in ORR mass activity in alkaline solution with 0.1 mol L^(à1)methanol,against a big decrease of almost 100%for commercial *** after 30,000 potential cycles with 1.0 mol L^(à1)methanol,Rh_4Pd_(40)Ag_(56)NPs still retain ORR mass activity of up to 68.3%.DFT calculations reveal that excellent ORR performance with excellent methanol tolerance originates the active d-band-pinning engineering for an efficient site-independent electron-transfer.A generalized d-band mediated fine electron-transfer tuning path has blueprinted for effectively minimizing intrinsic ORR barriers with high current *** present work highlights the key role of Rh doping in enhancing the ORR activity and methanol tolerance ability of PdAg NPs for future high-performance DMFCs.

关键词： Rh-doped Multimetallic Oxygen reduction Methanol tolerance Fuel cells

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Biomass waste as an alternative source of carbon and silicon-based absorbents for CO2 capturing application

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Chemosphere 2023年 343卷

作者： Suresh, R. Gnanasekaran, Lalitha Rajendran, Saravanan Jalil, A.A. Soto-Moscoso, Matias Khoo, Kuan Shiong Ma, Zengling Halimatul Munawaroh, Heli Siti Show, Pau Loke Departamento de Ingeniería Mecánica Facultad de Ingeniería Universidad de Tarapacá Avda. General Velásquez 1775 Arica Chile University Centre for Research & Development Department of Mechanical Engineering Chandigarh University Punjab Mohali140413 India Department of Chemical Engineering Lebanese American University Byblos Lebanon Centre of Hydrogen Energy Institute of Future Energy Johor UTM Johor Bahru81310 Malaysia Faculty of Chemical and Energy Engineering Universiti Teknologi Malaysia Johor UTM Johor Bahru81310 Malaysia Universidad Autónoma de Chile Chile Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan Taiwan Centre for Herbal Pharmacology and Environmental Sustainability Chettinad Hospital and Research Institute Chettinad Academy of Research and Education Tamil Nadu Kelambakkam603103 India Zhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection Wenzhou University Wenzhou325035 China Study Program of Chemistry Faculty of Mathematics and Science Education Universitas Pendidikan Indonesia Jalan Dr. Setiabudhi 229 Bandung40154 Indonesia Department of Chemical Engineering Khalifa University P.O. Box 127788 Abu Dhabi United Arab Emirates Department of Chemical and Environmental Engineering Faculty of Science and Engineering University of Nottingham Malaysia Jalan Broga Selangor Darul Ehsan Semenyih Malaysia

The production of low-cost solid adsorbents for carbon dioxide (CO2) capture has gained massive consideration. Biomass wastes are preferred as precursors for synthesis of CO2 solid adsorbents, due to their high CO2 adsorption efficiency, and ease of scalable low-cost production. This review particularly focuses on waste biomass-derived adsorbents with their CO2 adsorption performances. Specifically, studies related to carbon (biochar and activated carbon) and silicon (silicates and geopolymers)-based adsorbents were summarized. The impact of experimental parameters including nature of biomass, synthesis route, carbonization temperature and type of activation methods on the CO2 adsorption capacities of biomass-derived pure carbon and silicon-based adsorbents were evaluated. The development of various enhancement strategies on biomass-derived adsorbents for CO2 capture and their responsible factors that impact adsorbent's CO2 capture proficiency were also reviewed. The possible CO2 adsorption mechanisms on the adsorbent's surface were highlighted. The challenges and research gaps identified in this research area have also been emphasized, which will help as further research prospects. © 2023 Elsevier Ltd

关键词： Carbon dioxide

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