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Third-order optical properties of Ag nanocubes and Ag@Au hollow nanostructures investigated by femtosecond Z-Scan measurements

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Optik 2025年

作者： Claudevan A. Sousa Antonio F.A.A. Melo Nefe J.B. Silva Tânia Patrícia Silva e Silva Bartolomeu C. Viana Francisco Eroni P. Santos Hans Garcia Department of Physics UFPI - Universidade Federal do Piauí 64049-550 Teresina PI Brazil Materials Engineering Graduate Program Federal Institute of Education Science and Technology of Piauí Central Campus Teresina 64000-040 PI Brazil Interdisciplinary Laboratory for Advanced Materials BioMatLab group Materials Science & Engineering Graduate Program UFPI - Universidade Federal do Piauí 64049-550 Teresina PI Brazil

We present a comprehensive study on the third-order nonlinear optical properties of silver nanocubes (Ag-NCs) and Ag@Au hollow bimetallic nanostructures in aqueous dispersions. The Ag@Au bimetallic nanostructures were synthesized by galvanic replacement of Ag-NCs with gold, generating nanoboxes with surface plasmon resonance (SPR) tunability. Using the femtosecond Z-scan technique (1040 nm, 357 fs) across laser intensities from 99.7 to 279 GW/cm², we identified negative nonlinear refraction in both Ag-NCs and Ag@Au nanoboxes, attributed to hot electron generation. Saturable absorption (SA) was observed only in Ag@Au nanoboxes, distinguishing their potential for nonlinear photonic applications. These findings highlight the impact of morphology and composition on nonlinear refraction and absorption, positioning Ag@Au hollow nanostructures as promising candidates for active media in advanced photonic devices.

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Advanced landfill leachate treatment: Sequential electrocoagulation and electrooxidation system for efficient remediation

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Journal of Water Process engineering 2025年 74卷

作者： Justen, Nicóli Borba, Fernando H. Mayer, Ildemar Seibert, Daiana Inticher, Jonas J. Ferreira Piazzi Fuhr, Ana C. Carissimi, Elvis Leichtweis, Jandira Postgraduate Program of Environment and Sustainable Technologies Federal University of Fronteira Sul Av. Jacob Reinaldo Haupenthal 1580 RS Cerro Largo 97900-000 Brazil Postgraduate Program of Chemical Engineering West Paraná State University Rua da Faculdade 645 Jd. Santa Maria PR Toledo 85903-000 Brazil Materials Science and Engineering Graduate Program Federal University of Pelotas 1 Gomes Carneiro St. RS Pelotas 96010-610 Brazil Department of Sanitation and Environmental Engineering Federal University of Santa Maria Av. Roraima 1000 RS Santa Maria 97105-000 Brazil

The treatment of concentrated landfill leachate generated by nanofiltration and reverse osmosis processes represents a significant challenge. This concentrate is characterized by high concentrations of heavy metals, contaminants of emerging concern, dissolved salts, and organic compounds. In this study, a novel advanced treatment system integrating an Electrocoagulation Reactor with a subsequent electrooxidation process was proposed. Two anode/cathode arrangements were evaluated: electrocoagulation followed by electrooxidation with “boron-doped diamond” and steel electrodes, and electrocoagulation followed by electrooxidation with “boron-doped diamond” and aluminum electrodes, focusing on their effectiveness in degrading contaminants and improving the quality of the treated concentrated landfill leachate. In order to monitor the efficiency of the electrocoagulation process and integrated systems, the degradation of the physicochemical parameters of absorbance at 254 nm, total organic carbon, and turbidity were investigated. Within the best performance, acute toxicity indices (Artemia salina - LC50) were determined and possible degradation and/or formation of contaminants of emerging concern were identified by gas chromatography–mass spectrometry (GC–MS). The results indicated the mineralization of 73 % of total organic carbon and 25 % of total nitrogen, an increase in the biodegradability fraction (BOD5/COD) of the concentrated landfill leachate from 0.18 to 0.35, as well as a significant reduction in toxicity (LC50 of 54.4 %), demonstrated by Artemia salina bioassays. The reduction in toxic potential was also observed in the by-product analysis by GC–MS, which indicated the removal of emerging contaminants such as benzene, 2-(2-methoxy-1-propenyl)-1,3,5-trimethylbenzene, benzothiazole, 2-(methylthio) and phenol, 2,2′-methylenebis[6-(1,1-dimethylethyl)-4-methyl-. These findings highlight that the integration of the electrocoagulation process with electrooxidation us

关键词： Concentrated landfill leachate Contaminants of emerging concern Electrocoagulation Electrooxidation

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An evaluation of the corrosion behavior of orthodontic Ni-Ti archwires as a function of residence time the oral cavity

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ECS Transactions 2012年第50期50卷 99-112页

作者： Britto, Káthia M.F. Macedo, Daniel A. Nascimento, Rubens M. Martinelli, Antonio E. Júnior, Hélio S. Materials Science and Engineering Post-Graduate Program Federal University of Rio Grande Do Norte 59072-970 Natal Brazil

The objective of the present study was to evaluate the effect of the residence time in the oral cavity on the electrochemical and microstructural properties of nickel-titanium superelastic and thermoelastic archwires aiming at establishing optimum treatment parameters regarding materials selection and maintenance of orthodontic apparatus. The corrosion behaviour of commercial archwires of different diameters was studied after periods of use from 1 to 3 months in the oral cavity of patients submitted to orthodontic treatment. Electrochemical measurements and scanning electron microscopy (SEM) were performed. The results revealed that the stiffness of superelastic archwires increased upon use, making it unnecessary to replace archwires in the early stages of treatment with the objective of adapting the diameter of the wire. Electrochemical tests suggested extremely high corrosion resistance of the nickel-titanium alloy even in severe acid environment. SEM images revealed limited pit formation concentrated in the archwire-bracket contacts. © The Electrochemical Society.

关键词： Dental orthoses

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Acoustofluidic bioassembly induced morphogenesis for therapeutic tissue fabrication

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Nature Communications 2025年第1期16卷 1-19页

作者： Kang, Byungjun Jeong, Eunseon Han, Seung Yeop Heo, Jeong Hyun Lee, Yunam Choi, Suah Choi, Yunjung Kang, Donyoung Hwang, Youn-Hoo Lee, Jiin Seo, Jung Hwa Kim, Jinyoung Jeong, Inhea Kim, Enji Lee, Juyoung Kim, Dae-Eun Park, Jang-Ung Cho, Sung-Rae Jin, Yoonhee Cho, Seung-Woo Lee, Hyungsuk School of Mechanical Engineering Yonsei University Seoul 03722 South Korea Department of Biotechnology Yonsei University Seoul 03722 South Korea Department of Biomaterials Science and Engineering Yonsei University Seoul 03722 South Korea Department of Physiology Yonsei University College of Medicine Seoul 03722 South Korea Department and Research Institute of Rehabilitation Medicine Yonsei University College of Medicine Seoul 03722 South Korea Graduate Program of Biomedical Engineering Yonsei University College of Medicine Seoul 03722 South Korea Department of Materials Science and Engineering Yonsei University Seoul 03722 South Korea Center for Nanomedicine Institute for Basic Science (IBS) Seoul 03722 South Korea Department of Neurosurgery Yonsei University College of Medicine Seoul 03722 South Korea Graduate Program of Nano Biomedical Engineering (NanoBME) Advanced Science Institute Yonsei University Seoul 03722 South Korea Rehabilitation Institute of Neuromuscular Disease Yonsei University College of Medicine Seoul 03722 South Korea Department of Rehabilitation Medicine Graduate School of Medical Science Brain Korea 21 Project Yonsei University College of Medicine Seoul 03722 South Korea Brain research institute Yonsei University College of Medicine Seoul 03722 South Korea

To build in vitro tissues for therapeutic applications, it is essential to replicate the spatial distribution of cells that occurs during morphogenesis in vivo. However, it remains technically challenging to simultaneously regulate the geometric alignment and aggregation of cells during tissue fabrication. Here, we introduce the acoustofluidic bioassembly induced morphogenesis, which is the combination of precise arrangement of cells by the mechanical forces produced by acoustofluidic cues, and the morphological and functional changes of cells in the following in vitro and in vivo cultures. The acoustofluidic bioassembly can be used to create tissues with regulated nano-, micro-, and macro-structures. We demonstrate that the neuromuscular tissue fabricated with the acoustofluidic bioassembly exhibits enhanced contraction dynamics, electrophysiology, and therapeutic efficacy. The potential of the acoustofluidic bioassembly as an in situ application is demonstrated by fabricating artificial tissues at the defect sites of living tissues. The acoustofluidic bioassembly induced morphogenesis can provide a pioneering platform to fabricate tissues for biomedical applications. © The Author(s) 2025.

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Meter-scale heterostructure printing for high-toughness fiber electrodes in intelligent digital apparel

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Nature Communications 2025年第1期16卷 1-10页

作者： Lee, Gun-Hee Lee, Yunheum Seo, Hyeonyeob Jo, Kyunghyun Yeo, Jinwook Kim, Semin Bae, Jae-Young Kim, Chul Majidi, Carmel Kang, Jiheong Kang, Seung-Kyun Ryu, Seunghwa Park, Seongjun Medical Research Center Seoul National University Seoul South Korea Departments of Cogno-Mechatronics Engineering and Optics & Mechatronics Engineering Pusan National University Busan South Korea Department of Bio and Brain Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea Program of Brain and Cognitive Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea Department of Mechanical Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea Graduate School of Semiconductor Technology Korea Advanced Institute of Science and Technology (KAIST) Daejeon South Korea Department of Materials Science and Engineering Seoul National University Seoul South Korea Department of Mechanical Engineering Carnegie Mellon University Pittsburgh PA United States Department of Chemistry Seoul National University Seoul Seoul South Korea School of Transdisciplinary Innovations Seoul National University Seoul South Korea Department of Biomedical Science College of Medicine Seoul National University Seoul South Korea Interdisciplinary Program in Bioengineering College of Engineering Seoul National University Seoul South Korea Department of Transdisciplinary Medicine Seoul National University Hospital Seoul South Korea

Intelligent digital apparel, which integrates electronic functionalities into clothing, represents the future of healthcare and ubiquitous control in wearable devices. Realizing such apparel necessitates developing meter-scale conductive fibers with high toughness, conductivity, stable conductance under deformation, and mechanical durability. In this study, we present a heterostructure printing method capable of producing meter-scale (~50 m) biphasic conductive fibers that meet these criteria. Our approach involves encapsulating deformable liquid metal particles (LMPs) within a functionalized thermoplastic polyurethane matrix. This encapsulation induces in situ assembly of LMPs during fiber formation, creating a heterostructure that seamlessly integrates the matrix’s durability with the LMPs’ superior electrical performance. Unlike rigid conductive materials, deformable LMPs offer stretchability and toughness with a low gauge factor. Through precise twisting using an engineered annealing machine, multiple fiber strands are transformed into robust, electrically stable meter-scale electrodes. This advancement enhances their practicality in various intelligent digital apparel applications, such as stretchable displays, wearable healthcare systems, and digital controls. © The Author(s) 2025.

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Amplification of enzymatic and microbial fuel cells using organic electrochemical transistors

Device

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Device 2025年

作者： Saxena, Ravindra Zhang, Xu Cai, Rong Suggs, Olivia Bruggeman, Chase Hickey, David P. Ajo-Franklin, Caroline M. Verduzco, Rafael Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston 77005 TX United States Department of Biosciences Rice University Houston 77005 TX United States Department of Chemical Engineering and Materials Science Michigan State University East Lansing 48824 MI United States Department of Bioengineering Rice University Houston 77005 TX United States Department of Chemical and Biomolecular Engineering Rice University Houston 77005 TX United States Rice Advanced Materials Institute Rice University Houston 77005 TX United States

Organic electrochemical transistors (OECTs) are thin-film devices operated in aqueous and biological environments for sensing chemicals and biomolecules. However, most sensor configurations involve introducing the target biomolecule directly in the OECT device. This has drawbacks because it may not be possible to have an electrolyte compatible with the target biomolecule or an environment optimal for the OECT. Here, we demonstrate a general and modular approach to building electrochemical sensors by coupling OECTs electronically with either an enzymatic fuel cell (EFC) or microbial fuel cell (MFC). We demonstrate that this modular approach can amplify currents by three orders of magnitude and enhance the signal-to-noise ratio. We also show that the power generated by the fuel cell can help tune the sensor's response for different applications. This work demonstrates a simple and versatile approach for amplifying currents from MFCs and EFCs useful for the development of bioelectronic sensors. © 2025 The Authors

关键词： amplification biosensors DTI-3: Develop electro-active bacteria enzymatic fuel cells microbial fuel cells organic electrochemical transistors power

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Self-Healable Sandfish Scale-Inspired Scalable Triboelectric Layer for Hybrid Energy Harvesting in Desert Environment (Small 4/2025)

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Small 2025年第4期21卷

作者： An-Rong Chen Parag Parashar Manish Kumar Sharma Jing-Siang Shih Hsuan-Yu Yeh Yen-Jui Lin Kuldeep Kaswan Kai-Po Fan Po-Yu Chen Zong-Hong Lin Department of Materials Science and Engineering National Tsing Hua University Hsinchu 30013 Taiwan Department of Biomedical Engineering National Taiwan University Taipei 10617 Taiwan Institute of Biomedical Engineering National Tsing Hua University Hsinchu 30013 Taiwan International Intercollegiate Ph.D. Program National Tsing Hua University Hsinchu 30013 Taiwan

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Boosting overall water splitting by incorporating sulfur into NiFe(oxy)hydroxide

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Journal of Energy Chemistry 2022年第1期31卷 364-371,I0010页

作者： Chiho Kim Seong Hyun Kim Seunghun Lee Ilyeong Kwon Seong Hyun Kim Shinho kim Changgyu Seok Yoo Sei Park Yangdo Kim Department of Materials Science and Engineering Pusan National UniversityBusan 46241Republic of Korea BK21 Four Innovative Graduate Education Program for Global High-tech Materials&PartsPusan National UniversityBusan 46241Republic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH).Pohang 37673Republic of Korea

Developing highly active and cost-effective electrocatalysts for enhancing the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is a significant challenge for overall water ***-incorporated nickel iron(oxy)hydroxide(S-NiFeOOH)nanosheets were directly grown on commercial nickel foam using a galvanic corrosion method and a hydrothermal *** incorporation of sulfur into NiFeOOH enhanced the catalytic activity for the HER and OER in 1 M KOH *** enhanced catalytic activity is attributed to the change in the local structure and chemical states due to the incorporation of *** performance for overall water splitting was achieved with an alkaline water *** was realized by employing S-NiFeOOH as a bifunctional electrocatalyst,thereby outperforming a water electrolyzer that requires the usage of precious metal electrocatalysts(i.e.,Pt/C as the HER electrocatalyst and IrO_(2) as the OER electrocatalyst).Moreover,when driven by a commercial silicon solar cell,an alkaline water electrolyzer that uses S-NiFeOOH as a bifunctional electrocatalyst generated hydrogen under natural *** study shows that S-NiFeOOH is a promising candidate for a large-scale industrial implementation of hydrogen production for overall water splitting because of its low cost,high activity,and *** addition,the solar-driven water electrolyzer using S-NiFeOOH as a bifunctional electrocatalyst affords the opportunity for developing effective and feasible solar power systems in the future.

关键词： Overall water splitting Hydrogen production Sulfur incorporated NiFe(oxy)hydroxide Electrocatalysts Solar-driven water splitting

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Improving the Performance of Asphalt Mixtures with Highly Acidic Aggregates in Central Vietnam Using Modifier Based on Styrene-Butadiene-Styrene and Rosin Resin

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Journal of materials in Civil engineering 2025年第7期37卷

作者： Nguyen, Lan Ngoc Lee, Hosin David Bui, Lam Tung Kim, Young-Ik Truong, Van Quyet Nguyen, May Huu Nguyen, Du Van Dept. of Construction Materials Faculty of Construction Engineering Univ. of Transport and Communications No. 03 Cau Giay Hanoi100000 Viet Nam Dept. of Civil and Environmental Engineering Iowa Technology Institute The Univ. of Iowa Iowa CityIA52242 United States Research Dept. Hansoo Natech Co. Ltd. 6-20 Yuseong-daero 1205beon-gil Yuseong-gu Daejeon34104 Korea Republic of Civil and Environmental Engineering Program Graduate School of Advanced Science and Engineering Hiroshima Univ. 1-4-1 Kagamiyama Higashi-Hiroshima Hiroshima739-8527 Japan Faculty of Civil Engineering Univ. of Transport and Communications Campus in Ho Chi Minh City Ho Chi Minh City700000 Viet Nam

In Central Vietnam, the aggregate typically originates from highly acidic rocks containing a significant amount of silicon dioxide (SiO2), leading to poor adhesion quality with virgin asphalt binder. Hence, the asphalt mixture production usually needs to utilize adhesion promoters. Based on the chemical compositions of the sample aggregate (up to 72.3% SiO2), research has been conducted to introduce an adhesive agent called rubber modified compound (RMC-160), which is composed of styrene-butadiene-styrene (SBS) with petroleum hydrocarbon resin, treated clay and mineral oil. This article presents the research findings regarding the adhesion effectiveness of RMC-160-modified asphalt binder to high acid-based aggregate through laboratory and field tests, along with the mixture performance under both short-term oven aging (STOA) and long-term oven aging (LTOA). The test results exhibited remarkable effects, whereby the asphalt binder modified with RMC-160 additive significantly increased the adhesion level from Grade 2 to Grade 4, and the asphalt mixtures containing RMC-160 had lower rutting and higher cracking tolerance (CTIndex) under both the STOA and LTOA conditions. © 2025 American Society of Civil Engineers.

关键词： Silicon oxides

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Nanostructured Multicomponent Bioinks with Nanodiamond and Magnesium-Doped Nanohydroxyapatite for Enhanced Bone Tissue engineering

SSRN

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SSRN 2025年

作者： Nicolae, Carmen-Valentina Jahani Kadousaraei, Masoumeh Yamada, Shuntaro Aydin, Mehmet Serhat Al-Sharabi, Niyaz Campodoni, Elisabetta Sandri, Monica Steinmüller-Nethl, Doris Syverud, Kristin Rashad, Ahmad Stancu, Izabela Cristina Mustafa, Kamal Advanced Polymer Materials Group University Politehnica of Bucharest 1-7 Gh. Polizu Street Bucharest011061 Romania Center of Translational Oral Research Department of Clinical Dentistry Faculty of Medicine University of Bergen Bergen Norway CNR-ISTEC Institute of Science and Technology for Ceramics National Research Council of Italy Faenza Italy DiaCoating GmbH Wattens Austria RISE PFI AS Trondheim Norway Bioengineering Graduate Program Aerospace and Mechanical Engineering University of Notre Dame Notre DameIN46556 United States

The development of bioinks for bone tissue engineering (BTE) requires a precise balance of printability, stability and bioactivity to ensure cell viability while supporting cell attachment, proliferation and osteogenic differentiation. Although numerous bioink formulations for BTE demonstrate good printability and bioactivity, they often lack the stability or osteogenic potential required to support long-term bone regeneration. To address these limitations, we developed multicomponent formulations for extrusion-based bioprinting by combining TEMPO-oxidized cellulose nanofibrils (TO-CNFs) with gelatin methacryloyl (GelMA) and sodium alginate (SA). The formulation was further loaded with nanodiamond particles (NDs), magnesium-doped nanohydroxyapatite (MgHA) or a combination of both to impart synergistic effects. This study investigates the individual and combined effects of NDs and MgHA on the printability, structural integrity, biocompatibility, and osteogenic performance of the bioink, hypothesizing that a dual nanoparticle system could provide superior multifunctionality. Rheological and printability tests confirmed that the incorporation of NDs improved the structural integrity and printing fidelity of the printed structures, with all formulations showing comparable mechanical properties. Seeded human gingival fibroblasts showed enhanced viability and spreading, and favorable metabolic activity and proliferation on ND-containing hydrogels. While the viability and elongation of bioprinted osteoblast-like cells in all four bioinks were comparable, MgHA-containing bioinks promoted osteogenic differentiation of osteoblasts, shown by increased Runx2 expression, ALP activity, and biomineralization. These findings suggest that the combined incorporation of NDs and MgHA within the TO-CNFs-GelMA-SA matrix provides a promising platform with robust printability and enhanced bioactivity, addressing the current trade-offs in the design of bioinks for comprehensive BTE. © 2025,

关键词： Bone

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