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SSRN 2022年

作者： Deng, Jia Chen, Weiguo Wu, Feng Dai, Yitao Dionysiou, Dionysios D. Huang, Li-Zhi School of Civil Engineering Wuhan University No. 8 East Lake South Road Wuhan430072 China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University 430072 China School of Resources and Environmental Science Wuhan University Wuhan China Department of Applied Chemistry University of Science and Technology of China Hefei230026 China Environmental Engineering and Science Program Department of Chemical and Environmental Engineering University of Cincinnati CincinnatiOH45221-0012 United States

Peroxymonosulfate (PMS)-based advanced oxidation processes have become promising water treatment technologies in recent years due to the generation ability of powerful oxidative radicals. The redox cycle between transitional metals in heterogeneous catalysis is essential for the continuous activation of PMS, which determines the removal efficiency of organic pollutants. In this work, we first prepared Fe3O4 using precipitation method under alkaline anoxic conditions and subsequently added Ni2+ aqueous solution to synthesize Ni-Fe (hydr)oxide catalysts. Ni-Fe (hydr)oxide catalysts show efficient PMS activation ability, causing the degradation of organic pollutants including trichloroethylene, perchloroethylene, bisphenol A, phenol, and tribromophenol. In Ni-Fe (hydr)oxides/PMS system, nonradical pathway is dominant at the initial stage of the reaction which generates SO5•− and indirectly produces 1O2. In this system, 1O2 and dissolved O2 together participate in the O2 cycling, •OH generation, and electron transfer involving the reduction of Ni(III). The formed Ni(II) reacted with PMS to generate strong oxidative •OH and SO4•− through radical pathway for pollutant degradation. The optimum Ni/Fe ratio of Ni-Fe (hydr)oxide catalysts under the studied conditions was 0.50. Ni-Fe (hydr)oxides show high reactivity and stability in real water matrices, demonstrating Ni-Fe (hydr)oxides are promising catalysts for PMS activation to degrade organic pollutants in contaminated water. © 2022, The Authors. All rights reserved.

关键词： Organic pollutants

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Impact of droplets onto surfactant-laden thin liquid films

arXiv

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arXiv 2022年

作者： Constante-Amores, C.R. Kahouadji, L. Shin, S. Chergui, J. Juric, D. Castrejón-Pita, J.R. Matar, O.K. Castrejón-Pita, A.A. Department of Engineering Science University of Oxford OxfordOX1 3PJ United Kingdom Department of Chemical Engineering Imperial College London LondonSW7 2AZ United Kingdom Department of Mechanical and System Design Engineering Hongik University Korea Republic of Orsay91400 France Department of Applied Mathematics and Theoretical Physics University of Cambridge CambridgeCB3 0WA United Kingdom Department of Mechanical Engineering University College London WC1E 7JE United Kingdom

We study the effect of insoluble surfactants on the impact of surfactant-free droplets on surfactant-laden thin liquid films via a fully three-dimensional direct numerical simulations approach that employs a hybrid interface-tracking/level-set method, and by taking into account surfactant-induced Marangoni stresses due to gradients in interfacial surfactant concentration. Our numerical predictions for the temporal evolution of the surfactant-free crown are validated against the experimental work by Che & Matar (2017). We focus on the 'crown-splash regime', and we observe that the crown dynamics evolves through various stages: from the the growth of linear modes (through a RayleighPlateau instability) to the development of nonlinearities leading to primary and secondary breakup events (through droplet shedding modulated by an end-pinching mechanism). We show that the addition of surfactants does not affect the wave selection via the Rayleigh-Plateau instability. However, the presence of surfactants plays a key role in the late stages of the dynamics as soon as the ligaments are driven out from the rim. Surfactant-induced Marangoni stresses delay the end-pinching mechanisms to result in longer ligaments prior to their capillary singularity. Our results indicate that Marangoni stresses bridge the gap between adjacent protrusions promoting its collision and the merging of ligaments. Finally, we demonstrate that the addition of surfactants leads to surface rigidification and consequently to the retardation of the flow dynamics. © 2022, CC BY.

关键词： Surface active agents

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Giant Deep-Ultraviolet Circular Dichroism in Synthetic Architectures of Ordered Carbon Nanotubes

Giant Deep-Ultraviolet Circular Dichroism in Synthetic Archi...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Jacques Doumani Minhan Lou Oliver Dewey Nina Hong Jichao Fan Andrey Baydin Matteo Pasquali Yohei Yomogida Kazuhiro Yanagi Riichiro Saito Junichiro Kono Weilu Gao Department of Electrical and Computer Engineering Rice University Houston TX USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX USA Department of Electrical and Computer Engineering The University of Utah Salt Lake City UT USA Carbon Hub Rice University Houston TX USA Department of Chemical and Biomolecular Engineering Rice University Houston TX USA J.A. Woollam Co. Lincoln NE USA The Smalley-Curl Institute Rice University Houston TX USA Department of Chemistry Rice University Houston TX USA Department of Materials Science and NanoEngineering Rice University Houston TX USA Department of Physics and Astronomy Tokyo Metropolitan University Tokyo Japan Department Physics Tohoku University Sendai Japan Department Physics and Astronomy Rice University Houston TX USA

We demonstrate tunable, giant, and structure-induced deep-ultraviolet circular dichroism in macroscopically chiral assemblies of racemic carbon nanotubes prepared using two approaches: mechanical-rotation-assisted vac... 详细信息

ISBN: (纸本)9781957171258

关键词： Carbon nanotubes Chiral media Dichroism Graphene Optical activity Quantum information

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A Recursively Recurrent Neural Network (R2N2) Architecture for Learning Iterative Algorithms

arXiv

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arXiv 2022年

作者： Doncevic, Danimir T. Mitsos, Alexander Guo, Yue Li, Qianxiao Dietrich, Felix Dahmen, Manuel Kevrekidis, Ioannis G. Forschungszentrum Jülich GmbH Jülich52425 Germany RWTH Aachen University Aachen52062 Germany JARA-ENERGY Jülich52425 Germany Aachen52074 Germany Department of Mathematics National University of Singapore Singapore Department of Informatics Technical University of Munich Boltzmannstr. 3 Garching b. Munich85748 Germany Departments of Applied Mathematics and Statistics & Chemical and Biomolecular Engineering Johns Hopkins University BaltimoreMD21218 United States

Meta-learning of numerical algorithms for a given task consists of the data-driven identification and adaptation of an algorithmic structure and the associated hyperparameters. To limit the complexity of the meta-learning problem, neural architectures with a certain inductive bias towards favorable algorithmic structures can, and should, be used. We generalize our previously introduced Runge–Kutta neural network to a recursively recurrent neural network (R2N2) superstructure for the design of customized iterative algorithms. In contrast to off-the-shelf deep learning approaches, it features a distinct division into modules for generation of information and for the subsequent assembly of this information towards a solution. Local information in the form of a subspace is generated by subordinate, inner, iterations of recurrent function evaluations starting at the current outer iterate. The update to the next outer iterate is computed as a linear combination of these evaluations, reducing the residual in this space, and constitutes the output of the network. We demonstrate that regular training of the weight parameters inside the proposed superstructure on input/output data of various computational problem classes yields iterations similar to Krylov solvers for linear equation systems, Newton-Krylov solvers for nonlinear equation systems, and Runge–Kutta integrators for ordinary differential equations. Due to its modularity, the superstructure can be readily extended with functionalities needed to represent more general classes of iterative algorithms traditionally based on Taylor series expansions. © 2022, CC BY.

关键词： Runge Kutta methods

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A Model of Fluid-Structure and Biochemical Interactions for Applications to Subclinical Leaflet Thrombosis

arXiv

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arXiv 2022年

作者： Barrett, Aaron Brown, Jordan A. Smith, Margaret Anne Woodward, Andrew Vavalle, John P. Kheradvar, Arash Griffith, Boyce E. Fogelson, Aaron L. Department of Mathematics University of Utah Salt Lake CityUT United States Department of Mathematics University of North Carolina Chapel HillNC United States Advanced Medical Imaging Lab University of North Carolina Medical Center Chapel HillNC United States University of North Carolina School of Medicine Chapel HillNC United States Division of Cardiology Department of Medicine University of North Carolina Chapel HillNC United States Department of Biomedical Engineering University of California Irvine IrvineCA United States Department of Mathematics Applied Physical Sciences and Biomedical Engineering University of North Carolina Chapel HillNC United States Carolina Center for Interdisciplinary Applied Mathematics University of North Carolina Chapel HillNC United States Computational Medicine Program University of North Carolina Chapel HillNC United States McAllister Heart Institute University of North Carolina Chapel HillNC United States Department of Mathematics and Biomedical Engineering University of Utah Salt Lake CityUT United States

Subclinical leaflet thrombosis (SLT) is a potentially serious complication of aortic valve replacement with a bioprosthetic valve in which blood clots form on the replacement valve. SLT is associated with increased risk of transient ischemic attacks and strokes and can progress to clinical leaflet thrombosis. SLT following aortic valve replacement also may be related to subsequent structural valve deterioration, which can impair the durability of the valve replacement. Because of the difficulty in clinical imaging of SLT, models are needed to determine the mechanisms of SLT and could eventually predict which patients will develop SLT. To this end, we develop methods to simulate leaflet thrombosis that combine fluid-structure interaction and a simplified thrombosis model that allows for deposition along the moving leaflets. Additionally, this model can be adapted to model deposition or absorption along other moving boundaries. We present convergence results and quantify the model's ability to realize changes in valve opening and pressures. These new approaches are an important advancement in our tools for modeling thrombosis in which they incorporate both adhesion to the surface of the moving leaflets and feedback to the fluid-structure interaction. © 2022, CC BY-SA.

关键词： Deposition

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Marangoni-driven patterns, ridges, and hills in surfactant-covered parametric surface waves

arXiv

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arXiv 2024年

作者： Panda, Debashis Kahouadji, Lyes Tuckerman, Laurette S. Shin, Seungwon Chergui, Jalel Juric, Damir Matar, Omar K. Department of Chemical Engineering Imperial College London LondonSW7 2AZ United Kingdom Physique et Mécanique des Milieux Hétérogènes CNRS ESPCI Paris Université PSL Sorbonne Université Université de Paris Paris75005 France Dept. of Mechanical and System Design Engineering Hongik Univ. Seoul04066 Korea Republic of Orsay91400 France Dept. of Applied Mathematics and Theoretical Physics Univ. of Cambridge CambridgeCB3 0WA United Kingdom

Parametric oscillations of an interface separating two fluid phases create nonlinear surface waves, called Faraday waves, which organise into simple patterns, like squares and hexagons, as well as complex structures, such as double hexagonal and superlattice patterns. In this work, we study the influence of surfactant-induced Marangoni stresses on the formation and transition of Faraday wave patterns. We use a quantity B, that assesses the relative importance of Marangoni stresses as compared to the the surface wave dynamics. Our results show that the threshold acceleration required to destabilise a surfactant-covered interface through vibration increases with increasing B. For a surfactant-free interface, a square wave pattern is observed. As B is incremented, we report transitions from squares to asymmetric squares, weakly wavy stripes, and ultimately to ridges and hills. These hills are a consequence of the bi-directional Marangoni stresses at the neck of the ridges. The mechanisms underlying the pattern transitions and the formation of exotic ridges and hills are discussed. © 2024, CC BY.

关键词： Surface waves

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A bibliometric review on applications of lignocellulosic fibers in polymeric and hybrid composites: Trends and perspectives

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Heliyon 2024年第19期10卷 e38264页

作者： Santos, Caroliny M. Santos, Thiago F. Rao, H Jeevan Silva, F. Higor V.A. Mavinkere Rangappa, Sanjay Boonyasopon, Pawinee Siengchin, Suchart Souza, D.F.S. Nascimento, J.H.O. Postgraduate Program in Chemical Engineering Technology Center Federal University of Rio Grande do Norte Av. Prof. Sen. Salgado Filho 3000 Natal 59072-970 Rio Grande do Norte Brazil Department of Mathematics School of Sciences and Humanities Nazarbayev University Astana 010000 Kazakhstan Natural Composites Research Group Lab Department of Materials and Production Engineering The Sirindhorn International Thai-German School of Engineering (TGGS) King Mongkut's University of Technology North Bangkok (KMUTNB) Bangkok Thailand Department of Design Management and Business Development Faculty of Architecture and Design King Mongkut's University of Technology North Bangkok (KMUTNB) Bangkok Thailand

Over the past 10 years, materials science and engineering have shown increasing interest in incorporating lignocellulosic fibers into polymer and hybrid composites (LCF-CPH). This bibliometric analysis, covering the period 2012 to 2022, examines the current state of research on the application of these fibers in composites, with the aim of identifying significant contributions, new trends, and possible future directions. The analysis included a comprehensive database search using specific criteria, which revealed a significant increase in research activity on a variety of lignocellulosic fibers, such as flax, jute, hemp and sisal. This growth is particularly evident in the packaging, automotive, aerospace and construction industries. Hybrid composites based on these fibers have gained prominence due to their enhanced properties, which include improvements in mechanical, thermal and environmental characteristics. The findings of this research have significant implications for governments, corporations, and academic institutions. Researchers gain a deeper understanding of emerging trends, industry gains valuable insights into the advantages of adopting lignocellulosic fibers, and policymakers gain essential information to support the development of sustainable composites. In the field of advanced composites and sustainable materials, this work lays a solid foundation for future research and industrial applications. © 2024

关键词： Applications Composites Natural fibers Polymers

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Controlling the dewetting morphologies of thin liquid films by switchable substrates

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Physical Review Fluids 2023年第12期8卷 L122001-L122001页

作者： S. Zitz A. Scagliarini J. Harting Helmholtz Institute Erlangen-Nürnberg for Renewable Energy Forschungszentrum Jülich Fürther Strasse 248 D-90429 Nürnberg Germany Department of Chemical and Biological Engineering Friedrich-Alexander-Universität Erlangen-Nürnberg Fürther Straße 248 D-90429 Nürnberg Germany IMFUFA Department of Science and Environment Roskilde University Postbox 260 DK-4000 Roskilde Denmark Institute for Applied Mathematics “M. Picone” (IAC) Consiglio Nazionale delle Ricerche (CNR) Via dei Taurini 19 I-00185 Rome Italy INFN Sezione Roma “Tor Vergata” via della Ricerca Scientifica 1 I-00133 Rome Italy Department of Chemical and Biological Engineering and Department of Physics Friedrich-Alexander-Universität Erlangen-Nürnberg Fürther Straße 248 D-90429 Nürnberg Germany

Switchable and adaptive substrates emerged as valuable tools for controlling wetting and actuation of droplet motion. Here, we report a computational study of the dynamics of an unstable thin liquid film deposited on a switchable substrate, modeled with a space- and time-varying contact angle. For a sufficiently large rate of wettability variation, a topological transition appears. Instead of breaking up into droplets, as expected for a substrate with multiple wetting minima, a metastable rivulet state emerges. A criterion discriminating whether or not rivulets occur is identified in terms of a single dimensionless parameter. Finally, we show and derive theoretically how the film rupture times, droplet shape, and rivulet lifetime depend on the pattern wavelength and speed.

关键词： Coatings Drop interactions Thin fluid films Wetting Microfluidic devices Lattice-Boltzmann methods

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Correction to: Environmental consequences of interacting effects of changes in stratospheric ozone, ultraviolet radiation, and climate: UNEP Environmental Effects Assessment Panel, Update 2024 (Photochemical & Photobiological Sciences, (2025), 24, 3, (357-392), 10.1007/s43630-025-00687-x)

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Photochemical and Photobiological Sciences 2025年第5期24卷 863-865页

作者： Neale, Patrick J. Hylander, Samuel Banaszak, Anastazia T. Häder, Donat-P. Rose, Kevin C. Vione, Davide Wängberg, Sten-Åke Jansen, Marcel A. K. Busquets, Rosa Andersen, Mads P. Sulbæk Madronich, Sasha Hanson, Mark L. Schikowski, Tamara Solomon, Keith R. Sulzberger, Barbara Wallington, Timothy J. Heikkilä, Anu M. Pandey, Krishna K. Andrady, Anthony L. Bruckman, Laura S. White, Christopher C. Zhu, Liping Bernhard, Germar H. Bais, Alkiviadis Aucamp, Pieter J. Chiodo, Gabriel Cordero, Raúl R. Petropavlovskikh, Irina Neale, Rachel E. Olsen, Catherine M. Hales, Simon Lal, Aparna Lingham, Gareth Rhodes, Lesley E. Young, Antony R. Robson, T. Matthew Robinson, Sharon A. Barnes, Paul W. Bornman, Janet F. Harper, Anna B. Lee, Hanna Calderón, Roy Mackenzie Ossola, Rachele Paul, Nigel D. Revell, Laura E. Wang, Qing-Wei Zepp, Richard G. Environmental Research Center Smithsonian Institution EdgewaterMD United States Centre for Ecology and Evolution in Microbial Model Systems Linnaeus University Kalmar Sweden Unidad Académica de Sistemas Arrecifales Universidad Nacional Autónoma de México Puerto Morelos Mexico Erlangen Germany Department of Biological Sciences and Department of Civil and Environmental Engineering Rensselaer Polytechnic Institute TroyNY United States Department of Chemistry University of Turin Turin Italy Department of Marine Sciences University of Gothenburg Gotheburg Sweden School of Biological Earth and Environmental Sciences Environmental Research Institute University College Cork Cork Ireland Chemical and Pharmaceutical Sciences Kingston University London Kingston Upon Thames United Kingdom Civil Environmental & Geomatic Engineering University College London London United Kingdom Department of Chemistry and Biochemistry California State University NorthridgeCA United States Atmospheric Chemistry Observations and Modeling National Center for Atmospheric Research BoulderCO United States USDA UV-B Monitoring and Research Program Colorado State University Fort. CollinsCO United States Department of Environment and Geography University of Manitoba WinnipegMB Canada Working Group Environmental Epidemiology IUF-Leibniz Research Institute for Environmental Medicine Düsseldorf Germany Department of Environment and Health School of Public Health University of Bielefeld Bielefeld Germany School of Environmental Sciences University of Guelph GuelphON Canada Retired From Eawag Swiss Federal Institute of Aquatic Science and Technology Dübendorf Switzerland Center for Sustainable Systems School for Environment and Sustainability University of Michigan Ann ArborMI United States Climate Research Finnish Meteorological Institute Helsinki Finland Indian Academy of Wood Science Bengaluru India Chemical and Biomolecular Engineering North Carolina State University RaleighN

This work is not a product of the U.S. Government or the U.S. Environmental Protection Agency, and the author is not doing this work in any governmental capacity. This research was not performed or funded by EPA and was not subject to EPA’s quality system requirements. The views expressed in this journal article are those of the author(s) and do not necessarily represent the views or the policies of the U.S. Environmental Protection Agency. The original article has been corrected. © The Author(s), under exclusive licence to the European Photochemistry Association, European Society for Photobiology 2025.

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Fabrication and characterization of hybrid eco-friendly high methoxyl pectin/gelatin/TiO2/curcumin (PGTC) nanocomposite biofilms for salmon fillet packaging

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International Journal of Biological Macromolecules 2023年 232卷

作者： Candra, Andy Tsai, Hsieh-Chih Saragi, Indah Revita Hu, Chien-Chieh Yu, Wan-Ting Krishnamoorthi, Rajakumari Hong, Zhen-Xiang Lai, Juin-Yih Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei106 Taiwan Advanced Membrane Materials Center National Taiwan University of Science and Technology Taipei106 Taiwan R&D Center for Membrane Technology Chung Yuan Christian University Chungli Taoyuan320 Taiwan Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Sumatera Utara Medan Indonesia Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan320 Taiwan

Hybrid eco-friendly nanocomposite films were fabricated by blending high-methoxyl pectin, gelatin, TiO2, and curcumin through the solution casting method. Various concentrations (0–5 wt%) of TiO2 nanoparticles (TNPs) and curcumin as an organic filler were added to the blend solutions. A high TNP concentration affected the surface morphology, roughness, and compactness of the films. Additionally, 3D mapping revealed the nanoparticle distribution in the film layers. Moisture content, water solubility, and light transmittance reduced dramatically with increasing TNP content, in accordance with the water vapor and oxygen permeabilities. X-ray diffraction revealed that the films were semicrystalline nanocomposites, and the thermal properties of the films increased when 5 wt% of TNPs was incorporated into the blend solution. Fourier-transform infrared and Raman analyses revealed interactions among biopolymers, nanoparticles, and organic fillers through hydrogen bonding. The shelf life of fresh salmon fillets was prolonged to six days for all groups, revealed by total viable counts and psychrotrophic bacteria counts, and the pH of the salmon fillets could be extended until the sixth day for all groups. Biodegradation assays demonstrated a significant weight loss in the nanocomposite films. Therefore, a nanocomposite film with 5 wt% TNPs could potentially be cytotoxic to NIH 3T3 cells. © 2023

关键词： TiO2 nanoparticles

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