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arXiv 2025年

作者： da Gomes, Djardiel S. Felix, Isaac M. Radel, Willian F. Dias, Alexandre C. Ribeiro Junior, Luiz A. Pereira Junior, Marcelo L. State University of Campinas Gleb Wataghin Institute of Physics Department of Applied Physics Campinas São Paulo13083-859 Brazil University of Brasília Faculty UnB Planaltina Materials Science Postgraduate Program Federal District Brasília Brazil Center for Agri-food Science and Technology Federal University of Campina Grande Paraíba Pombal58840-000 Brazil University of Brasília Institute of Physics Physics Postgraduate Program Federal District Brasília70910900 Brazil Institute of Physics International Center of Physics University of Brasília Federal District Brasília70910-900 Brazil Institute of Physics University of Brasília Federal District Brasília70910-900 Brazil Computational Materials Laboratory University of Brasília Federal District Brasília70910900 Brazil University of Brasília College of Technology Department of Electrical Engineering Federal District Brasília70910-900 Brazil

Recently synthesized Porous 12-Atom-Wide Armchair Graphene Nanoribbons (12-AGNRs) [Nano Lett. 2024, 24, 10718-10723]exhibit tunable properties through periodic porosity, enabling precise control over their electronic, optical, thermal, and mechanical behavior. This work presents a comprehensive theoretical characterization of pristine and porous 12-AGNRs based on density functional theory (DFT) and molecular dynamics (MD) simulations. DFT calculations reveal substantial electronic modifications, including band gap widening and the emergence of localized states. Analyzed within the Bethe–Salpeter equation (BSE) framework, optical properties highlight strong excitonic effects and significant absorption shifts. Thermal transport simulations indicate a pronounced reduction in conductivity due to enhanced phonon scattering at nanopores. At the same time, MD-based mechanical analysis shows decreased stiffness and strength while maintaining structural integrity. Despite these modifications, porous 12-AGNRs remain mechanically and thermally stable. These findings establish porosity engineering as a powerful strategy for tailoring graphene nanoribbons’ functional properties, reinforcing their potential for nanoelectronic, optoelectronic, and thermal management *** Codes 00-xx © 2025, CC BY.

关键词： Nanoribbons

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Carbon Nanofibers in Predicted Environmentally Relevant Concentrations Intensify Monocystis Sp. Infection and Affect the Lumbricus Terrestris Earthworms' Health

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SSRN 2023年

作者： Montalvão, Mateus Flores Gomes, Alex Rodrigues Guimarães, Abraão Tiago Batista de Lima Rodrigues, Aline Sueli de Matos, Letícia Paiva dos Santos Mendonça, Juliana da Luz, Thiarlen Marinho da Silva Matos, Stênio Gonçalves Rahman, M. Safiur Ragavendran, Chinnasamy Senthil-Nathan, Sengottayan Guru, Ajay Rakib, Md. Refat Jahan Mubarak, Nabisab Mujawar Rahman, Md. Mostafizur Rocha, Thiago Lopes Towfiqul Islam, Abu Reza Md. Malafaia, Guilherme Post-Graduation Program in Ecology Conservation and Biodiversity Federal University of Uberlândia MG Uberlândia Brazil Laboratory of Toxicology Applied to the Environment Goiano Federal Institute Urutaí Campus. Rodovia Geraldo Silva Nascimento 25 Km Zona Rural GO Urutaí Brazil Post-Graduation Program in Conservation of Cerrado Natural Resources Goiano Federal Institute GO Urutaí Brazil Post-Graduation Program in Biotechnology and Biodiversity Federal University of Goiás GO Goiânia Brazil Bangladesh Atomic Energy Commission Bangladesh Periyar University India Division of Biopesticides and Environmental Toxicology Sri Paramakalyani Centre for Excellence in Environmental Sciences Manonmaniam Sundaranar University Alwarkurichi Tamil Nadu Tirunelveli627 412 India Department of Cariology Saveetha Dental College and Hospitals SIMATS Tamil Nadu Chennai600 077 India Noakhali Science and Technology University Noakhali Bangladesh Petroleum and Chemical Engineering Faculty of Engineering Universiti Teknologi Brunei Bandar Seri Begawan BE1410 Brunei Jahangirnagar University Dhaka1342 Bangladesh Laboratory of Environmental Biotechnology and Ecotoxicology Institute of Tropical Pathology and Public Health Federal University of Goiás Goiás Goiania Brazil Department of Disaster Management Begum Rokeya University Rangpur5400 Bangladesh

Although the ecotoxicity of carbon-based nanomaterials (CBNs) is known, the potential effect of carbon nanofibers (CNFs) on edaphic organisms has not been evaluated. Thus, we aimed at the ecotoxicity of CNFs (at 10 and 100 mg/kg) in Lumbricus terrestris earthworms naturally infected with Monocystis sp. After 28 days of exposure, treatments did not affect the survival rate. However, we observed a significant loss of body biomass, and Monocystis sp. infection in seminal vesicles was potentiated by exposure to CNFs. Earthworms exposed to CNFs showed a redox imbalance in the seminal vesicle, muscle, and intestine and an alteration in nitric oxide production in these organs. In muscles, we also noticed a significant reduction in AChE activity in earthworms exposed to CNFs. The histopathological analyses revealed the treatments' significant effect on the structures of the different evaluated tissues. Although we did not notice a concentration-response for several of the biomarkers, when taken together and after the application of IBRv2 and principal component analysis (PCA), we noticed that the response of earthworms to CNFs at 100 mg/kg showed a more significant deviation from the unexposed group. This was mainly determined by inhibiting antioxidant activity in the seminal vesicle, biochemical biomarkers assessed in muscle and intestine, and histomorphometric muscle biomarkers from earthworms exposed to CNFs at 100 mg/kg. Thus, we demonstrate that CNFs increase the parasite load of Monocystis sp. of adult L. terrestris earthworms and induce biochemical changes and histopathological changes, especially at 100 mg/kg. Our results point to the additional impact these nanomaterials can have on the health of earthworms, signaling the need for greater attention to their disposal and ecotoxicological effects on soil organisms. © 2023, The Authors. All rights reserved.

关键词： Biomarkers

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Electrospun Nanofibers from Poly (Ε-Caprolactone) with Copaiba (Copaifera Sp)Oleoresin as an Advanced Healer

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SSRN 2024年

作者： Marcos Pinho da Silva, Andrey Miotto, Marília Afonso Provenzi, Marcel Lopes, Susane Maraschin, Marcelo Merlini, Claudia Sciences and Materials Engineering Graduate Program Federal University of Santa Catarina Reitor João David Ferreira Lima University Campus SC Florianópolis88040-900 Brazil Department of Materials Engineering Technology College Federal University of Amazonas AM Manaus Brazil Food Microbiology Laboratory Departament of Food Science and Technology Federal University of Santa Catarina Agrarian Sciences Center Av. Admar Gonzaga 1346 - Itacorubi SC . Florianópolis88034-001 Brazil Florianópolis Brazil Rua João Pessoa 2750 Bairro Velha Blumenau SC 89036-256 Brazil

Advanced healing developed using electrospinning show advantages such as highsurface area/volume relation, similarity with the skin extracellular matrix and ability toincorporate bioactive agents. The use of natural compounds, as the copaiba oleoresinresults in benefits due to its action as enhancer of biochemical agents during theinflammatory phase in the healing process. This study investigated the development ofnanofiber from polycaprolactone and copaiba oleoresin aiming at demonstrating itsantimicrobial and atoxic properties with healing effect on complex wounds. Thecopaiba oleoresin chemical composition revealed the predominance of sesquiterpenes,with majoritary components such as Caryophyllane, γ-Muurolene, and α-Copaene. Thenanofibers were anlyzed employing several techniques and revealed suitablephysicochemical characteristics for the development of advanced healing. The zetapotential indicated a negative surface load in the nanofibers, suggesting favorableinteractions for biomedical applications such as cell adherence. The copaiba oleoresinpresence significantly increased the liquid absorption ability, fundamental in advancedhealing, and accelerated the mass loss rate, emphasizing its influence in thebiodegradability of the nanofibers. The nanofibers showed efficacy againstStaphylococcus Aureus, while the cell viability assay indicared absence of *** results suggest the potential of these nanofibers as efficient and sustainableantimicrobial healing for clinical applications © 2024, The Authors. All rights reserved.

关键词： Nanofibers

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Microwave sinterability of pure and CuO doped ZnO macroporous ceramic foams with deposited zinc oxide nanoparticles produced by bioinspired replica technique 18

Microwave sinterability of pure and CuO doped ZnO macroporou...

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18th International Conference on Microwave and High Frequency Applications, AMPERE 2021

作者： Cardoso, A.L.F. Maestrelli, S.C. Perdomo, C.P.F. Kiminami, R.H.G.A. Gunnewiek, R.F.K. Federal University of São Carlos Post Graduate Program in Materials Science and Engineering rod. Washington Luiz km 235 SP São Carlos13565-905 Brazil km 533 MG Poços de Caldas 37715-400 Brazil

Macroporous open-celled ceramic foams finds applications in numerous technological fields, like particle filters, insulating coatings, porous support for catalyst and photocatalyst processes, and even photoelectrochemical applications. In latter two, a macroporous open cell structure favors photoelectrochemical and photocatalyst reactions, due to its higher surface area. Many methods are used for producing these types of ceramics, specially the replica technique. In this simple method, the samples are obtained by impregnating a highly porous polymeric foam with a high solid loading ceramic slurry. After thermal treatment, the macroporous ceramic presents the structure of the polymeric foam used as template. Exceptionally complex and regular geometries can also be found in nature, which is the case of the Luffa sp sponge, that can replace the use of synthetic polymeric foams. In this work, microwave sinterability of porous ceramics obtained by impregnation of high solid loading ceramic slurries of nanostructured zinc oxide in natural Luffa sp fibrous sponges. Carboxymethyl cellulose (CMC), xanthan gum (XG) and polyvinyl alcohol (PVA) were assessed as binder agents. Ceramic slurries were prepared by dispersing nanostructured zinc oxide in distilled water (70% wt. ratio) using ammonium polyacrilate (APA) as deflocculant, followed by mixing in a high shear mixer (IKA Ultra-Turrax T25) for 10 minutes. After homogenization, binders were added and mixed in mechanical mixer for 10 minutes. The sponges (with dimensions of 2x2x1 cm) were carefully immersed in the ceramic slurry, squeezed to remove excess and then left to dry 24h in air. The dried ceramic foams were microwave heated at 550 °C during 10 minutes with 100 °C/min heating rate, followed by microwave sintering at 1150 and 1200 °C during 15 minutes with a 100 °C/min heating rate. The microwave sintered samples were analyzed by optical and scanning electron microscopy, photocatalysis efficiency and density measurement

关键词： Microwave heating

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Modelling and Application of Jutes Fiber Reinforced Epoxy Composite in the Development of Wind Blade for Low Intensity Winds

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SSRN 2023年

作者： Junio, Raí Felipe Pereira Cardoso, Robson Luis B. Ramos, Roberto Paulo B. Leão Filha, Elza M. Ribeiro, Mauricio M. Candido, Verônica S. Rodrigues, Jean da S. Silva, Douglas Santos Monteiro, Sergio N. Fujiyama, Roberto T. Federal University of Pará—UFPA Engineering of Natural Resources of the Amazon Program Rua Augusto Corrêa 01 PA BelémCEP 66075-110 Brazil Federal Institute of Education Science and Technology of Pará – IFPA Materials Engineering Program Avenida Almirante Barroso 1155 Marco PA BelémCEP 66093-020 Brazil Federal University of Pará - UFPA Postgraduate Program in Industrial Engineering Rua Augusto Corrêa 01 PA BelémCEP 66075-110 Brazil Federal Institute of Education Science and Technology of Pará – IFPA Estrada do Icuí Guajará PA AnanindeuaCEP 67125-000 Brazil Military Institute of Engineering – IME Department of Materials Science Praça General Tibúrcio 80 Praia Vermelha Urca RJ Rio de JaneiroCEP 22290-270 Brazil

Natural fibres show an increasing potential as reinforcement of polymeric composites, representing a promising concurrent to glass and carbon fibres extensively used in the construction of wind turbine blades synthetic fibres recyclability/disposability and high production energy cost have already been discussed in the main turbine producing centres. In particular, the development of wind turbines for low wind speed areas can increase the energy generation potential of regions not originally eligible for the installation of large turbines. This study proposes the evaluation of the use of jute fibre (Corchorus capsularis) reinforced epoxy composite in the construction of S1210 airfoil profile, of a small-scale wind turbine for low wind speed regions, considering the structural parameters, developed incorporating the Classical Laminate Theory (CLT) and Extended Bredt-Batho Shear Flow Theory (EBSFT).In order to raise the elastic properties and enable the use of the failure criteria, the composite blades were characterized according to ASTM standards. The mechanical properties surveyed, together with the elastic parameters of the cross section, torsional stiffness, axial stiffness and flexural rigidity, demonstrated the feasibility of using the jute fiber reinforced epoxy composite in the blade construction, evaluated according to the maximum tension failure criterion. © 2023, The Authors. All rights reserved.

关键词： Laminated composites

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Characterization of the Root Surface of a Friction Stir Welded Uns S32760 Super Duplex Stainless Steel: Insights into its Microstructure and Corrosion Resistance

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SSRN 2023年

作者： Vacchi, G.S. de Carvalho, Willian S. Meinhardt, C.P. Bergmann, Luciano A. Amancio-Filho, Sergio T. Rovere, C.A.D. Munir Rachid Corrosion Laboratory Department of Materials Engineering Federal University of São Carlos Rodovia Washington Luis Km 235 SP São Carlos13565-905 Brazil Federal University of São Carlos Graduate Program in Materials Science and Engineering Brazil Graz University of Technology – TU Graz Institute of Materials Science Joining and Forming BMK Endowed Professorship for Aviation Kopernikusgasse 24/1 Graz8010 Austria Federal University of Pampa Department of Mechanical Engineering Avenida Tiarajú 810 RS Alegrete Brazil Helmholtz-Zentrum Hereon Institute of Materials Mechanics Solid State Materials Processing Max-Planck-Straße 1 Geesthacht Germany

The root surface of a friction stir welded super duplex stainless steel (UNS S32760) was thoroughly characterized in this study. The findings revealed a refined grain structure and a conspicuous increase of 50 HV0.3 in the Root's hardness. Interestingly, the volume fraction of the ferrite phase remained largely unchanged. Rapid cooling in the welding process led to the Cr2N precipitation at the ferrite/ferrite grain boundaries in the root area, significantly increasing sensitization, reducing localized corrosion resistance under high potentials in a neutral pH saline environment, and adversely affecting root passivity in a hydrochloric acid environment compared to the base metal. © 2023, The Authors. All rights reserved.

关键词： Friction stir welding

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Unveiling the Bioactivities and Bioaccessibility of Phenolic Compounds from Organic Coffee Husks Using an in Vitro Digestion Model

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SSRN 2023年

作者： Abreu, Thaianaly Leite Estévez, Mario de Carvalho, Leila Moreira de Medeiros, Lorena Lucena da Silva Pereira, Valquíria Cardoso Salu, Bruno Ramos Vilela Oliva, Maria Luiza Madruga, Marta Suely Alencar Bezerra, Taliana Kênia Post-Graduate Program in Food Science and Technology Department of Food Engineering Technology Centre Federal University of Paraiba PB João Pessoa58051-900 Brazil Research Institute of Meat and Meat Products IPROCAR TECAL Research Group Universidad de Extremadura Cáceres10003 Spain Department of Biochemistry Federal University of São Paulo SP São Paulo Brazil

The large amounts of by-products generated in the coffee industry are a problem for a sustainable agro-industry. The aim of this work was to investigate the occurrence of phenolic compounds in organic coffee husks and to evaluate their potential as a source of bioactive dietary components. To achieve this objective, three extracts were prepared, namely extractable polyphenols (EP), hydrolyzable non-extractable polyphenols (HNEP) and non-extractable polyphenols (NEP). These extracts were characterized and evaluated for their bioactive properties after simulated gastrointestinal digestion. The results show that the extraction process affects the occurrence of phenols from coffee peels, especially for caffeic acid, gallic acid, and chlorogenic acid. The condensed phenols and polyphenols found in the extracts and digests not only showed antioxidant properties against ABTS, FRAP and DPPH radicals, but also had remarkable bioavailability and anticoagulant potential. These results highlight the potential health benefits of phytochemicals from coffee husks and open new perspectives for the use of such compounds in dietary supplements. © 2023, The Authors. All rights reserved.

关键词： Antioxidants

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Retraction notice to "Microplastic occurrence in commercial crab (Portunus segnis) from the western coast of India and pollution indices: First investigation and evidence" [Sci. Total Environ. 905 (2023) 167500]

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The science of the total environment 2024年 957卷 177729页

作者： Vasantkumar Rabari Md Refat Jahan Rakib Jigneshkumar Trivedi Abubakr M Idris Guilherme Malafaia Animal Taxonomy and Ecology Laboratory Department of Life Sciences Hemchandracharya North Gujarat University Patan 384265 Gujarat India. Department of Fisheries and Marine Science Faculty of Science Noakhali Science and Technology University Noakhali Bangladesh. Department of Chemistry College of Science King Khalid University 61431 Abha Saudi Arabia Research Center for Advanced Materials Science (RCAMS) King Khalid University Abha 61421 Saudi Arabia. Post-Graduation Program in Conservation of Cerrado Natural Resources Goiano Federal Institute Urutaí GO Brazil Post-Graduation Program in Ecology Conservation and Biodiversity Federal University of Uberlˆandia Uberlˆandia MG Brazil Post-Graduation Program in Biotechnology and Biodiversity Federal University of Goi'as Goîania GO Brazil.

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Impact of absence of lactose on the dynamic sensory profile of yogurt: A multiple-intake TDS approach

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LWT 2022年 162卷

作者： Souza Olegario, Lary González-Mohino, Alberto Estévez, Mario Madruga, Marta Suely Ventanas, Sonia Post-Graduate Program in Food Science and Technology Department of Food Engineering Technology Centre Federal University of Paraiba Paraíba João Pessoa58051-900 Brazil IPROCAR Research Institute TECAL Research Group Universidad de Extremadura Cáceres10003 Spain

This paper aims to evaluate the impact of lactose free yogurt version on dynamic sensory perception and consumer acceptability. A total of 46 participants evaluated classical (SNY) and lactose-free (SLF-Y) commercial version of yogurts using the multiple-intake TDS technique, providing information about the dominant sequence of six flavor and texture sensory attributes. Moreover, information regarding the overall liking of the evaluated products was obtained. During the first intake, in SLF-Y samples, sourness presented a higher dominance rate compared to SNY. A similar dominance profile was obtained during the second intake between the two yogurts. During the third intake, SNY consumption was dominated by dairy attribute whereas during SLF-Y intake, fermented and creaminess were the dominance attributes. Yogurt version and the numbers of intakes presented a significant impact on temporal perception. Moreover, similar liking scores were reported for both evaluated yogurts. The present study revealed that absence of lactose showed an impact of temporal sensory perception of yogurt and the potential modifications on sensory perception can be revealed by applying the multiple intake TDS approach. © 2022 The Authors

关键词： Sensory perception

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Waste Valorization from Brazilian Nepheline Syenite Processing as a Strategic Approach to Advancing the Circular Economy

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SSRN 2023年

作者： Santos, Diego Haltiery Rosa, Laura Pereira Alves, Cleidson Rosa Simão, Lisandro Arcaro, Sabrina Klegues Montedo, Oscar Rubem Raupp-Pereira, Fabiano Graduate Program in Materials Science and Engineering University of the Extreme South of Santa Catarina Criciúma88806-000 Brazil Department of Civil Engineering Federal Institute of Santa Catarina Criciúma88813-600 Brazil Research Group on Sustainability and Waste Management Postgraduate Program in Environmental Technology University of Ribeirão Preto Ribeirão Preto14096-900 Brazil Brazil

The growing disparity between the high extraction of natural resources and low use of waste as alternative mineral resources will aggravate the scarcity of natural reserves. Therefore, the current linear economy model must be converted to sustainable economic models, such as the circular economy. To achieve this transition, it is important that waste recovery strategies are implemented with a continuous search for solutions for these materials. Thus, this study investigates the waste from the processing of nepheline syenite stone, to promote its valorization as an alternative mineral resource. The classification, potentiality, quantity/viability and applicability (CPQvA) criteria are used as tools to aid decision-making for the waste valorization. The environmental, physical, chemical, morphological, and durability characteristics of nepheline syenite waste (NSW) are analyzed. The results showed evidence for the substitution of NSW for up to 100% of fine aggregates and 25% of Portland cement in civil construction. Furthermore, NSW yields recoveries of more than 90% of potassium for use in agriculture, and up to 70% of iron ore for use in steelworks. Therefore, the results indicate that NSW is viable for different applications, contributing to industrial symbiosis and a strategy for advancing the circular economy. © 2023, The Authors. All rights reserved.

关键词： Sustainable development

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