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Enhancement of effluent degradation by zinc oxide, carbon nitride, and carbon xerogel trifecta on brass monoliths

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Environmental science and Pollution Research 2024年第40期31卷 53472-53496页

作者： da Silva, Émerson Felipe Mendonça Garcia, Ramón Raudel Peña Rodrigues, Liana Alvares Napoleão, Daniella Carla Sanz, Oihane Almeida, Luciano Costa Department of Chemical Engineering Technology and Geoscience Center Federal University of Pernambuco PE Recife50740-521 Brazil Pós Graduate Program in Materials Science and Engineering Federal University of Piauí PI Teresina64049-550 Brazil Academic Unit of Cabo de Santo Agostinho Federal Rural University of Pernambuco PE Cabo de Santo Agostinho54518-430 Brazil Dept. of Applied Chemistry Chemistry Faculty University of the Basque Country UPV/EHU P. Lardizabala 3 San Sebastian20018 Spain Escola de Engenharia de Lorena EEL/USP Estrada Municipal Do Campinho S/N São Paulo LorenaCEP 12602-810 Brazil

In recent years, heterogeneous photocatalysis has emerged as a promising alternative for the treatment of organic pollutants. This technique offers several advantages, such as low cost and ease of operation. However, finding a semiconductor material that is both operationally viable and highly active under solar irradiation remains a challenge, often requiring materials of nanometric size. Furthermore, in many processes, photocatalysts are suspended in the solution, requiring additional steps to remove them. This can render the technique economically unviable, especially for nanosized catalysts. This work demonstrated the feasibility of using a structured photocatalyst (ZnO, g-C3N4, and carbon xerogel) optimized for this photodegradation process. The synthesized materials were characterized by nitrogen adsorption and desorption, X-ray diffraction (XRD), and diffuse reflectance spectroscopy (DRS). Adhesion testing demonstrated the efficiency of the deposition technique, with film adhesion exceeding 90%. The photocatalytic evaluation was performed using a mixture of three textile dyes in a recycle photoreactor, varying pH (4.7 and 10), recycle flow rate (2, 4, and 6 L h−1), immobilized mass (1, 2, and 3 mg cm−2), monolith height (1.5, 3.0, and 4.5 cm), and type of radiation (solar and visible artificials;and natural solar). The structured photocatalyst degraded over 99% of the dye mixture under artificial radiation. The solar energy results are highly promising, achieving a degradation efficiency of approximately 74%. Furthermore, it was possible to regenerate the structured photocatalyst up to seven consecutive times using exclusively natural solar light and maintain a degradation rate of around 70%. These results reinforce the feasibility and potential application of this system in photocatalytic reactions, highlighting its effectiveness and sustainability. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Heterojunctions

Machine-learned design principles for enhanced red emission from nitride quantum wells

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arXiv 2024年

作者： Pant, Nick Armitage, Rob Kioupakis, Emmanouil Applied Physics Program University of Michigan Ann ArborMI48109 United States Department of Materials Science & Engineering University of Michigan Ann ArborMI48109 United States Lumileds LLC San JoseCA95131 United States

Significant effort has been devoted toward mitigating polarization fields in nitride LEDs, as they are viewed as detrimental to light emission, albeit with limited success for red emission. Here, we show that such fields can unusually enhance the optical oscillator strength of red-emitting nitride quantum wells. This insight is enabled by machine-learned models trained on multi-scale quantum-mechanical simulations, which allow for a global exploration of the quantum-well design space at greatly reduced computational cost. Larger polarization fields correlate with higher wave-function overlaps for red emission, a consequence of the quantum-confined Stark effect enabling thinner quantum wells. This finding has implications for designing efficient red nitride LEDs, which are crucial for miniaturizing polychromatic LED pixels to the micron scale for extended-reality and biomedical applications. More broadly, this work highlights the power of machine learning in accelerating the discovery of unconventional paradigms for semiconductor design. Copyright © 2024, The Authors. All rights reserved.

关键词： Semiconductor quantum wells

Biodegradable Pbat/Pla Blend Films Incorporated with Turmeric and Cinnamomum Powder: A Potential Alternative for Active Food Packaging

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SSRN

SSRN 2023年

作者： de Castro, Layara L.R.L. Abreu, Iago R. Braz, Cristiano J.F. Rodrigues, Samara C.S. dos Araújo, Regilda S.R.M. Folkersma, Rudy de Carvalho, Laura H. Barbosa, Renata Alves, Tatianny S. Graduate Program in Materials Science and Engineering Federal University of Piauí Teresina64.049-550 Brazil Department of Physics Federal Institute of Education Science and Technology of Piauí Teresina Central Campus Teresina64.000-040 Brazil Department of Nutrition Federal University of Piauí Teresina64.049-550 Brazil NHL Stenden University of Applied Sciences Groningen9727 Netherlands Graduate Program in Materials Science and Engineering Federal University of Campina Grande PI TeresinaCEP: 58.100-000 Brazil

Active packaging made from biodegradable polymers and natural additives appears as an ecological alternative. In addition to having antioxidant activity and enhancing food preservation, it allows mitigating the negative impacts caused by improper disposal. This study pursued to produce biodegradable films based on a polymer blend PBAT/PLA (Ecovio®) using the flat extrusion method. The films were prepared with the incorporation of 5 wt% of powdered turmeric or cinnamon as natural additives. The films obtained, and those reprocessed twice, were characterized in terms of colorimetric, UV light transmittance, water contact angle, water vapor permeability, morphology, mechanical properties, and antioxidant activity. Cinnamon reduced the UV light transmittance and made a surface more hydrophobic. Reprocessing led to greater elongation and maximum load, associated with increased dispersion and distribution, as evidenced in the morphological analysis. The films developed have significant potential for applications in active food packaging, with emphasis on cinnamon-additivated films. © 2023, The Authors. All rights reserved.

关键词： Biodegradable polymers

A mixed-order quasicontinuum approach for beam-based architected materials with application to fracture

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arXiv 2024年

作者： Kraschewski, Kevin Phlipot, Gregory P. Kochmann, Dennis M. Mechanics & Materials Lab Department of Mechanical and Process Engineering ETH Zürich Leonhardstr. 21 Zurich8092 Switzerland Divison of Engineering and Applied Science California Institute of Technology 1200 E. California Blvd. MC 155-44 PasadenaCA91125-2100 United States

Predicting the mechanics of large structural networks, such as beam-based architected materials, requires a multiscale computational strategy that preserves information about the discrete structure while being applicable to large assemblies of struts. Especially the fracture properties of such beam lattices necessitate a two-scale modeling strategy, since the fracture toughness depends on discrete beam failure events, while the application of remote loads requires large simulation domains. As classical homogenization techniques fail in the absence of a separation of scales at the crack tip, we present a concurrent multiscale technique: a fully-nonlocal quasicontinuum (QC) multi-lattice formulation for beam networks, based on a conforming mesh. Like the original atomistic QC formulation, we maintain discrete resolution where needed (such as around a crack tip) while efficiently coarse-graining in the remaining simulation domain. A key challenge is a suitable model in the coarse-grained domain, where classical QC uses affine interpolations. This formulation fails in bending-dominated lattices, as it overconstrains the lattice by preventing bending without stretching of beams. Therefore, we here present a beam QC formulation based on mixed-order interpolation in the coarse-grained region – combining the efficiency of linear interpolation where possible with the accuracy advantages of quadratic interpolation where needed. This results in a powerful computational framework, which, as we demonstrate through our validation and benchmark examples, overcomes the deficiencies of previous QC formulations and enables, e.g., the prediction of the fracture toughness and the diverse nature of stress distributions of stretching- and bending-dominated beam lattices in two and three dimensions. Copyright © 2024, The Authors. All rights reserved.

关键词： Crack tips

Nanoslot-Induced Ultrastrong Phonon-Photon and Phonon-Phonon Coupling in Hybrid Organic-Inorganic Perovskites 16

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Nanoslot-Induced Ultrastrong Phonon-Photon and Phonon-Phonon...

16th Pacific Rim Conference on Lasers and Electro-Optics, CLEO-PR 2024

作者： Kim, Dasom Hou, Jin Lee, Geon Agrawal, Ayush Kim, Sunghwan Zhang, Hao Bao, Di Baydin, Andrey Wu, Wenjing Tay, Fuyang Huang, Shengxi Hagenmüller, Daivd Chia, Elbert E. M. Kim, Dai-Sik Seo, Minah Mohite, Aditya D. Kono, Junichiro Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Sensor System Research Center Korea Institute of Science and Technology Seoul02792 Korea Republic of Department of Physics and Astronomy Seoul National University Seoul08826 Korea Republic of Department of Chemical and Biomolecular Engineering Rice University HoustonTX77005 United States Ulsan44919 Korea Republic of Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 637371 Singapore Smalley-Curl Institute Rice University HoustonTX77005 United States Université de Strasbourg Cnrs Strasbourg67000 France KU-KIST Graduate School of Converging Science and Technology Korea University Seoul02841 Korea Republic of Department of Physics and Astronomy Rice University HoustonTX77005 United States

Methods for harnessing vibrational states are desired for phonon-based technologies. We realized ultrastrong coupling of two phonon modes in perovskite materials induced by ultrastrong coupling with a common photonic ... 详细信息

ISBN: (纸本)9798350372076

关键词： Organic-inorganic materials

PVA-based bioinks for 3D bioprinting: A comprehensive review of their applications in tissue engineering

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Bioprinting 2025年 49卷

作者： Johari, Narges Adabavazeh, Zary Baino, Francesco Materials Engineering Group Golpayegan College of Engineering Isfahan University of Technology Golpayegan Iran Ph.D. Program Graduate Institute of Precision Manufacturing National Chin-Yi University of Technology Taichung Taiwan Institute of Materials Physics and Engineering Department of Applied Science and Technology Politecnico di Torino Torino Italy

3D bioprinting is an innovative approach that overcomes the limitations of traditional methods for creating cell-laden biomaterials and constructs. It allows for the fabrication of complex and biologically active tissue structures. This review aims to provide a comprehensive evaluation of polyvinyl alcohol (PVA)-based bioinks within a 3D bioprinting framework. PVA-based bioinks exhibit remarkable properties, such as biocompatibility, biodegradability, and the ability to enhance cell growth and differentiation. These properties make them appropriate for many tissue engineering applications. The study evaluates the physicochemical and biological properties of PVA bioinks, including how they combine with other materials such as gelatin, chitin, chitosan, alginate, agarose, cellulose, κ-carrageenan, methacrylate, nanoparticles, mineral additives, carbon nanotubes, graphene oxide, and extracellular matrix components. Furthermore, this review evaluates the benefits of market availability and enhanced printing resolution, in addition to the challenges posed by complexity, dependency on support baths, and the risk of contamination. The objective of this review is to draw attention to the capabilities of PVA-based bioinks and provide guidelines for future research to improve the effectiveness of these materials in tissue engineering and regenerative medicine. © 2025 The Authors

关键词： Bioink Bioprinting Polyvinyl alcohol PVA-based bioinks

Elastic wave dispersion in layered media with suture joints: influence of structural hierarchy and viscoelasticity

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arXiv 2023年

作者： Ongaro, Federica Bosia, Federico Pugno, Nicola M. Department of Civil Environmental and Mechanical Engineering Laboratory for Bio-inspired Bionic Nano Meta Materials and Mechanics University of Trento Italy Department of Weapon Systems and Ballistics Royal Military Academy 30 Avenue de la Renaissance Brussels1000 Belgium Department of Applied Science and Technology Politecnico di Torino TO Torino Italy School of Engineering and Materials Science Queen Mary University of London United Kingdom

Suture joints contribute to the exceptional combination of stiffness, strength, toughness and efficient load bearing and transmission of many biological structures like the cranium or ammonite fossil shells. However, their role in the attenuation of vibrations and effect on dynamic loads is less clear. Moreover, the self-similar hierarchical geometry often associated with suture joints renders its treatment with standard numerical approaches computationally prohibitive. To address this problem, this paper investigates the dynamic response of periodic layered media with suture joints using an analytical approach based on material homogenization. A general trapezoidal suture geometry is considered together with the fundamental ingredients of hierarchy and viscoelasticity. The Spectral Element Method and Bloch theorem are used to derive the dispersion relation and band diagram of the system, including propagating and evanescent dispersion modes. A strong influence of the suture morphology and material properties emerges, and the analysis reveals an important advantage of adding hierarchy, i.e. the possibility of simultaneously obtaining wider bandgaps and their shift to higher frequencies. A synergy between hierarchy and structure is also observed, providing superior levels of wave attenuation. These findings suggest a possible design concept for bioinspired devices with efficient and tailorable wave attenuation properties. © 2023, CC BY-NC-ND.

关键词： Energy gap

Bridging scales with Machine Learning: From first principles statistical mechanics to continuum phase field computations to study order-disorder transitions in LixCoO2

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arXiv 2023年

作者： Teichert, G.H. Das, S. Shojaei, M. Faghih Holber, J. Mueller, T. Hung, L. Gavini, V. Garikipati, K. Department of Mechanical Engineering University of Michigan United States Toyota Research Institute Los AltosCA United States Department of Materials Science & Engineering University of Michigan United States Department of Mathematics University of Michigan United States Michigan Institute for Computational Discovery & Engineering University of Michigan United States Applied Physics Program University of Michigan United States Materials Science & Engineering Johns Hopkins University United States

LixTMO2 (TM=Ni, Co, Mn) forms an important family of cathode materials for Li-ion batteries, whose performance is strongly governed by Li composition-dependent crystal structure and phase stability. Here, we use LixCoO2 (LCO) as a model system to benchmark a machine learning-enabled framework for bridging scales in materials physics. We focus on two scales: (a) assemblies of thousands of atoms described by density functional theory-informed statistical mechanics, and (b) continuum phase field models to study the dynamics of order-disorder transitions in LCO. Central to the scale bridging is the rigorous, quantitatively accurate, representation of the free energy density and chemical potentials of this material system by coarsegraining formation energies for specific atomic configurations. We develop active learning workflows to train recently developed integrable deep neural networks for such high-dimensional free energy density and chemical potential functions. The resulting, first principles-informed, machine learning-enabled, phase-field computations allow us to study LCO cathodes’ phase evolution in terms of temperature, morphology, charge cycling and particle size. © 2023, CC BY-NC-SA.

关键词： Cathodes

The Mid-Infrared Region Absorption of Graphene-based Photodetector with Au-grating Structure 16

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The Mid-Infrared Region Absorption of Graphene-based Photode...

16th IEEE International Conference on Nano/Molecular Medicine and engineering, NANOMED 2023

作者： Long, Wei-Yu Lin, Kuan-Chou Lu, Yu-Xuan Lin, Chih-Ting National Taiwan University B.S. Degree from the Department of Electrical Engineering National Taiwan University Graduate School of Advanced Technology Taiwan National Taiwan University B.S. Degree in Civil Engineering National Taiwan University and M.S. Degree Institute of Electronics Engineering Taiwan China B.S. Degree Department of Materials Science and Engineering Central South University China National Taiwan University M.S. Degree in Institute of Applied Mechanics from National Taiwan University Taiwan University of Michigan Ann ArborMI United States

ISBN: (纸本)9798350343700

Graphene, a single layer of carbon atoms arranged in a two-dimensional honeycomb lattice, has garnered immense attention for its exceptional electrical conductivity, transparency, and mechanical strength. These properties make graphene an ideal candidate for photodetectors, as it can efficiently convert incident photons into electrical signals. The integration of graphene into surface plasmonic devices has opened up new avenues for photodetection technology. In our research, we combine graphene and surface plasmonic devices to realize a high responsivity mid-infrared graphene photodetector with a grating metal/graphene/SiO2 structure. The Bruker Vertex70 Fourier-transform infrared spectroscopy (FTIR) was used for the mid-infrared spectrum measurement. With different linewidth of Au grating structure, the peak of absorption redshifts as the grating linewidth increases and the intensity is also different. Further, by adding graphene, the total absorption increases. Due to these advantages, the Au-grating graphene device can be used as infrared photodetectors. © 2023 IEEE.

关键词： Graphene