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Preparation of graphitic carbon nitride (g-C3N4) for novel dielectric and photocatalytic dye removal applications

Physica Scripta 2023年第9期98卷 095904-095904页

作者： Gupta, Aayush Jaidka, Sachin Rajagopalan, Pandey Mehtani, Hitesh Kumar Singhal, Varun Pandey, O.P. Department of Mechanical Engineering GLA University Uttar Pradesh Mathura281406 India School of Physics and Materials Science Thapar Institute of Engineering and Technology Punjab Patiala147004 India Cross College of Elite Program National Cheng Kung University Tainan70101 Taiwan Mechanical Engineering Department Thapar Institute of Engineering and Technology Punjab Patiala147004 India

Recent developments in 2D nanomaterials have greatly expanded their use in engineering applications. Graphitic carbon nitride (g-C3N4) shows a combination of electrical conductivity, sensing and luminescence abilities, biocompatibility, and chemical stability. The present study showcases the effectiveness of g-C3N4 as a photocatalyst for removing various organic molecules from water (such as methylene blue, 4-nitrophenol, and pharmaceutical drugs) and its potential use in dielectric applications when combined with an organic polymer (polyvinylidene fluoride;PVDF). XRD patterns confirmed the formation of g-C3N4 (which is complimented by the UV-Visible and FTIR results) and PVDF-g-C3N4 composite film. SEM-EDS verified the chemical homogeneity of the as-prepared g-C3N4 powder. Maximum photocatalytic degradation was observed for methylene blue dye (96.48%) with a half-life of 24.18 min, whereas the least degradation was detected for hydroxychloroquine (53.10%) with a half-life of 90.12 min after 120 min of UV-visible exposure. 10 wt% C3N4 reinforced PVDF thick films exhibited stable dielectric properties at low temperature (below 60°C) as compared to PVDF alone. At 1 kHz, the dielectric permittivity and tangent loss of the PVDF-g-C3N4 composites come out to be ∼6 and ∼0.05, respectively (at room temperature). The AC conductivity and activation energy of the synthesized composite was also studied. © 2023 IOP Publishing Ltd

关键词： Organic pollutants

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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

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Enhancing Pharmaceutical Wastewater Treatment: Ozone-Assisted Electrooxidation and Precision Optimization Via Response Surface Methodology

SSRN

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SSRN 2023年

作者： Phan, Huy N.Q. Leu, Jyh Hoang Nguyen, Vi N.D. Department of Materials Science and Engineering Feng Chia University Taichung40744 Taiwan Master’s Program of Green Energy Science and Technology Feng Chia University Taichung40744 Taiwan Department of Chemical Engineering Feng Chia University Taichung40744 Taiwan

In this study, the treatment of pharmaceutical wastewater was conducted using electrooxidation (EO) and ozone-assisted electrooxidation (EO/O3) with Pt-coated Ti electrodes (Pt/Ti). The removal of chemical oxygen demand (COD), color, and the UV absorption peak at 300 nm (UV300) was investigated in a batch mode reactor. Highly significant quadratic regression models for both processes were revealed through experimental design and optimization using the Box-Behnken Design (BBD) methodology. Current density, initial pH, and electrolysis time were assigned as independent variables for the statistical models. Under optimal conditions of 110.63 A m−2 current density and an initial pH of 4.5 for 477 minutes, stand-alone electrooxidation achieved the removal of 70.5% of COD, 81.25% color reduction, and a 40.01% decrease in UV300. In contrast, ozone-assisted electrooxidation performed even more effectively, with the removal of 84% for COD, 99.43% for color, and 49.63% for UV300. These results were obtained under optimal conditions of 150 A m−2 current density and an initial pH of 8.79 for 480 minutes. In addition, positive results in the kinetic study also gave this study an appeal. It was seen that ozone-assisted electrooxidation is an effective method for the pharmaceutical wastewater treatment. © 2023, The Authors. All rights reserved.

关键词： Ozone

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Tunable Multimodal Guided Surface Lattice Resonances in Index-Discontinuous Environments

arXiv

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arXiv 2024年

作者： Huang, Suichu Yao, Kan Huang, Wentao Zhao, Xuezheng Zheng, Yuebing Pan, Yunlu Key Laboratory of Micro-Systems and Micro-Structures Manufacturing Ministry of Education School of Mechatronics Engineering Harbin Institute of Technology Harbin150001 China Walker Department of Mechanical Engineering Material Science and Engineering Program Texas Materials Institute The University of Texas at Austin AustinTX78712 United States

Surface lattice resonances (SLRs) in metasurfaces are promising in applications of sub-wavelength devices, owning properties such as high quality (high-Q) factors, large local field enhancement and extensive long-range interaction. The tunable peak position and multimodal resonances of SLRs further enhance their appeal for flexible and multi-wavelength light-matter interactions. Despite these advantages, the realization of tunable multimodal SLRs often requires reconfiguring the lattices, leading to limited tunability. Furthermore, current high-Q SLR implementations necessitate a homogeneous dielectric environment, restricting potential applications such as biosensors that are typically operated in an aqueous or air cladding on a substrate. Here we present guided-SLRs (gSLRs), which are easily accessible in index-discontinuous environments while retaining the multimodal property and straightforward tunability of mode number, resonance wavelengths and mode coupling strengths. The gSLRs are achieved by coupling the scattered light from metasurface units into a slab waveguide, creating a light propagating channel in the lattice plane within an index-asymmetric environment. Tailoring the radiation pattern of individual units with guided transverse electric (TE) and transverse magnetic (TM) modes, multimodal resonances in both orthogonal and parallel coupling directions are accomplished. The mode number and resonance wavelengths can be easily controlled by adjusting the waveguide configuration, while the mode coupling strength is tuned by the vertical position of lattices in the slab. Further shift of the multimodal gSLRs from visible to near-infrared is achieved by introducing a gold backplane. The easy-to-access, flexibly tunable and multimodal gSLRs in inhomogeneous media offer a promising solution to advancing the realization of ultrathin and ultracompact nano-optical and optoelectronic devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Waveguides

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Low-Loss, Nonvolatile Tuning of Bragg Structures with Sb2Se3

Low-Loss, Nonvolatile Tuning of Bragg Structures with Sb2Se3

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Conference on Lasers and Electro-Optics (CLEO)

作者： Nicholas A. Nobile Chuanyu Lian Hongyi Sun Yi-Siou Huang Brian Mills Cosmin Constantin Popescu Dennis Callahan Juejun Hu Carlos A. Ríos Ocampo Nathan Youngblood Electrical & Computer Engineering Department University of Pittsburgh Pittsburgh PA USA Department of Materials Science & Engineering University of Maryland College Park MD USA Institute for Research in Electronics and Applied Physics University of Maryland College Park MD USA Department of Materials Science & Engineering Massachusetts Institute of Technology Cambridge MA USA Draper Scholar Program The Charles Stark Draper Laboratory Inc Cambridge MA USA The Charles Stark Draper Laboratory Inc Cambridge MA USA

Sb 2 Se 3 is used to switch between broadband transparency and enhanced index contrast in two device types leveraging Bragg gratings for tunable stop-and pass-band functionalities. Experimental results highlight fabr... 详细信息

ISBN: (纸本)9798350369311

关键词： Bragg gratings Waveguide transitions Phase change materials Optical filters Optical switches Refractive index Fabry-Perot Indexes Passband Optical waveguides

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Enhanced Localized Surface Plasmon Resonance of Gold Nanoparticles Synthesized on Cellulose Nanocrystals 15

Enhanced Localized Surface Plasmon Resonance of Gold Nanopar...

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15th IEEE International Conference on Nano/Molecular Medicine and engineering, NANOMED 2021

作者： Kaur, Jaspreet Kandhola, Gurshagan Batta-Mpouma, Joseph Chen, Jingyi Sakon, Joshua Kim, Jin-Woo University of Arkansas Department of Biological & Agricultural Engineering Institute For Nanoscience & Engineering FayettevilleAR United States Materials Science & Engineering Program Institute For Nanoscience & Engineering University of Arkansas Department of Biological & Agricultural Engineering FayettevilleAR United States University of Arkansas Department of Chemistry & Biochemistry FayettevilleAR United States

ISBN: (纸本)9781665458566

Plasmonic gold nanoparticles (AuNPs) exhibit a phenomenon called localized surface plasmon resonance (LSPR), making them suitable for several applications in nanotheranostics, bio-imaging and optoelectronic sensing. However, this property needs further tuning and enhancement to improve their sensitivity. Here, we developed hybrid nanocomposites by synthesizing AuNPs on the surface of cellulose nanocrystals (CNCs), with the hypothesis that confinement of collective oscillations of electrons at the interface of CNCs and AuNPs would lead to LSPR enhancement. This study uses a seed-mediated approach for growth of AuNPs on CNC surface and the ratio of gold salt to reducing agent was optimized to tune the growth. Ultraviolet/visible/near-infrared Spectroscopy, Dynamic Light Scattering, Atomic Force Microscopy and X-Ray Diffraction were used to validate hybrid formation and associated enhancement in LSPR. © 2021 IEEE.

关键词： Gold nanoparticles

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Corrigendum to “Time-course concentration of ethanol, acetaldehyde and acetate in rat brain dialysate following alcohol self-administration” [Alcohol 123 (2025) 69–76]

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Alcohol 2025年 125卷 53-54页

作者： Tse-Ang Lee Hongjoo J. Lee Regina A. Mangieri Rueben Gonzales Heba Ajmal Tanya Hutter Department of Mechanical Engineering The University of Texas at Austin Austin TX 78712 USA Department of Psychology The University of Texas at Austin Austin TX 78712 USA College of Pharmacy Division of Pharmacology and Toxicology The University of Texas at Austin Austin TX 78712 USA Department of Neuroscience The University of Texas at Austin Austin TX 78712 USA Materials Science and Engineering Program and Texas Materials Institute The University of Texas at Austin Austin TX 78712 USA

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900 MHz RF Power Rectifier Based on Ultra-low Turn-on Voltage Quasi-vertical GaN Schottky Diode

900 MHz RF Power Rectifier Based on Ultra-low Turn-on Voltag...

引用

Wireless Power Week (WPW)

作者： Xiaochen Yu Ya-Xun Lin Ivona Z. Mitrovic Steve Hall Der-Sheng Chao Jenq-Horng Liang Yi Huang Ta-Jen Yen Jiafeng Zhou International Intercollegiate Ph.D. Program National Tsing Hua University Hsinchu Taiwan Department of Electrical Engineering and Electronics University of Liverpool Liverpool United Kingdom Nuclear Science and Technology Development Center National Tsing Hua University Hsinchu Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan Department of Materials Science and Engineering National Tsing Hua University Hsinchu Taiwan

ISBN: (数字)9798350349139

ISBN: (纸本)9798350349146

This paper presents a 20 W high-power RF-to-DC rectifier that can be applied to wireless power transfer (WPT) systems. To address the power limitations of conventional diodes, a rectifier is designed based on a gallium nitride (GaN) integrated circuit (IC) quasi-vertical Schottky barrier diode (SBD). Leveraging the advantages of high mobility, wide bandgap, and saturation velocity of the GaN, significant benefits of the diode have been derived, with an ultra-low turn-on voltage of 0.23 ± 0.005 V (at 1 A/cm 2 ) and a high breakdown voltage of 180 V, to improve the rectification performance. Using this diode, a high-power rectifier with a wide input power range and high efficiency is developed. The proposed rectifier structure consists of a single-shunt self-developed diode and a topology with class-F harmonics control networks. It achieves a peak power conversion efficiency of 72.9% with an input power of 43 dBm at 900 MHz.

关键词： Wireless communication Integrated circuits Schottky diodes Wireless sensor networks Breakdown voltage Rectifiers Wireless power transfer

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Flash Sintering of Rhenium at Ambient Temperature in < 1 Minute with Electrical Current

SSRN

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SSRN 2023年

作者： Bamidele, Emmanuel A. Weimer, Alan W. Raj, Rishi Materials Science and Engineering Program University of Colorado BoulderCO80309 United States Department of Mechanical Engineering University of Colorado BoulderCO80309-0427 United States Department Chemical and Biological Engineering University of Colorado BoulderCO80309 United States

We show that rhenium can be sintered from powders to nearly full density (99.96%) by the direct injection of dc current (without a furnace) into dogbone shaped specimens in Ar atmosphere ( © 2023, The Authors. Al... 详细信息

关键词： Sintering

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Natural features, wettability, and optical diffraction patterns on an elastomeric replica of a superhydrophobic leaf derived via soft lithography

Natural features, wettability, and optical diffraction patte...

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Optical Manipulation and Structured materials Conference 2023

作者： Budlayan, Marco Laurence M. Palangyos, Dina C. Patricio, Jonathan N. Arco, Susan D. Guerrero, Raphael A. Department of Physics Ateneo de Manila University Loyola Heights Quezon City1108 Philippines Mathematics and Natural Sciences Department College of Computing Pangasinan State University Pangasinan Urdaneta Philippines Materials Science and Engineering Program College of Science University of the Philippines Diliman Diliman Quezon City1101 Philippines Synthetic Organic Chemistry Laboratory Institute of Chemistry College of Science University of the Philippines Diliman Diliman Quezon City1101 Philippines

ISBN: (纸本)9781510663398

Surface features of natural materials such as cuticles, shells, and leaves continue to be used as models for creating sophisticated infrastructure, landscape, and microdevice designs. Optical microscopy is the easiest and most accessible tool for examining such surface features and micropatterns. This method, however, fails to probe opaque surfaces like thick skin and leaves since it needs enough light to penetrate the sample. In this work, we demonstrate the feasibility of probing the natural structures of a superhydrophobic leaf using simple optical microscopy by replicating the leaf surface on an elastomer via soft lithography. Optical images of the replica revealed intricate details of features present on the leaf, including the stoma, cuticle boundary, and trichome. Contact angle measurements were also conducted to investigate the wettability of the real leaves and their replicas. Finally, we utilized the fabricated replicas as optical gratings that were observed to generate various diffraction patterns with fluctuating intensities. Our work offers a new perspective on alternative optical microscopy strategies and optical beam tuning using biomimetic, low-cost materials. © 2023 SPIE.

关键词： Contact angle

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