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SSRN 2023年

作者： Fernandes, Daiane Hernandes, Paola Gay Moreira, Mario Lucio Raubach, Cristiane Wienke Jardim, Pedro Lovato Gomes Ferrer, Mateus Meneghetti Moreira, Eduardo Ceretta Mastelaro, Valmor Roberto Cava, Sergio da S. Post-Graduate Program in Materials Science and Engineering Federal University of Pelotas RS Pelotas96010-610 Brazil Post-Graduate Program in Physics Federal University of Pelotas RS Capão do Leão96160-000 Brazil Spectroscopy Laboratory Federal University of Pampa RS Bagé96413-172 Brazil Physics Institute São Paulo University SP São Carlos13560-970 Brazil

BaZr1-2xFe2xO3-δ (x=0.00, 0.02, 0.04 and 0.08) samples were prepared by microwave-assisted hydrothermal method quickly and at low-temperature. Furthermore, we explored for the first time the effect of iron (Fe) in the barium zirconate (BZO) lattice on photocatalytic and piezocatalytic activity to degrade organic dye. Fe insertion reduced the band gap, altered the electronic structure and induced luminescence quenching. The catalytic activity of the samples was analyzed through the degradation of the rhodamine B (RhB) dye. The photocatalytic experiment was performed under UVC light and the piezocatalytic experiment under ultrasonic vibration. The pure sample of BZO showed better photocatalytic performance, while the insertion of Fe was unfavorable to degrade RhB. In contrast, pure BZO has negligible piezocatalytic activity, but a low Fe content is highly beneficial for promoting piezocatalysis. Based on the findings, this study provides important information for obtaining effective photocatalysts and piezocatalysts to be used in environmental remediation. © 2023, The Authors. All rights reserved.

关键词： Iron

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Effect of Fe on the Photo/Piezocatalytic Activity of Bazr1-2xfe2xo3-Δ Ceramics

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SSRN 2023年

作者： Fernandes, Daiane Hernandes, Paola Gay Moreira, Mario Lucio Raubach, Cristiane Wienke Gomes Jardim, Pedro Lovato Ferrer, Mateus Meneghetti Moreira, Eduardo Ceretta Mastelaro, Valmor Roberto Cava, Sergio da S. Post-Graduate Program in Materials Science and Engineering Federal University of Pelotas RS Pelotas96010-610 Brazil Post-Graduate Program in Physics Federal University of Pelotas RS Capão do Leão96160-000 Brazil Spectroscopy Laboratory Federal University of Pampa RS Bagé96413-172 Brazil Physics Institute São Paulo University SP São Carlos13560-970 Brazil

关键词： Temperature

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Influence of Phase Transformation Coefficient on Thermomechanical Modeling of Laser Powder Bed Fusion for Maraging 300 Steel

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SSRN 2024年

作者： dos Santos Silva, Bruno Caetano de Figueiredo Soares, Lucas Coelho, Rodrigo Santiago Sitek, Wojciech Król, Mariusz Batalha, Gilmar Ferreira University Center SENAI CIMATEC SENAI Innovation Institute for Forming and Joining of Materials Av. Orlando Gomes 1845 Piata BA Salvador41650-010 Brazil Department of Mechatronics and Mechanical Systems Engineering Polytechnic School of Engineering University of Sao Paulo Av. Prof. Mello Moraes 2231 Butantã SP Sao Paulo05508-030 Brazil University Center SENAI CIMATEC Post-Graduation Program MPDS/GETEC/MCTI Av. Orlando Gomes 1845 Piata Salvador-BA41650-010 Brazil Department of Engineering Materials and Biomaterials Faculty of Mechanical Engineering Silesian University of Technology 18A Konarskiego St. Gliwice44-100 Poland

Manufacturing maraging steel components using laser-based powder bed fusion (LPBF) presents an attractive proposition for industries due to the material's combination of mechanical properties such as hardness, wear resistance, and toughness, and the capability to produce parts with complex geometries and high precision. Despite these advantages, the LPBF process induces defects such as distortion and residual stress associated with the complex thermal cycles, compromising final part quality. Numerical simulations have been developed to predict these defects. However, LPBF simulations remain challenging due to the complexity of the process and the substantial computational resources required. For maraging steel, for example, the occurrence of phase transformation promotes compressive stress that interferes in results and makes simulations inaccurate. This research aims to simulate a geometry with a circular inner channel and investigate distortion, volume fraction of martensite and equivalent stress results. Modeling was performed by varying phase transformation rate parameters to assess the impact of transformations on simulation outcomes. Results showed minimal impact of these parameters on distortions and equivalent stress. Equivalent stress results were compared with literature findings, while distortion results were validated against experimental data to validate the accuracy of the model. © 2024, The Authors. All rights reserved.

关键词： Phase transitions

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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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Cellulose Microcrystalline: A Promising Ecofriendly Approach to Control Culex Quinquefasciatus Larvae

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SSRN 2023年

作者： de Souza, Sindoval Silva Gomes, Alex Rodrigues Batista Guimarães, Abraão Tiago Rodrigues, Aline Sueli de Lima de Matos, Letícia Paiva Mendonça, Juliana dos Santos Luz, Thiarlen Marinho da da Silva Matos, Stênio Gonçalves Safiur, M. Rahman Ragavendran, Chinnasamy Senthil-Nathan, Sengottayan Guru, Ajay Rakib, Md. Refat Jahan Mubarak, Nabisab Mujawar Mostafizur, Md. Rahman Rocha, Thiago Lopes Towfiqul Islam, Abu Reza Md. Malafaia, Guilherme Post-Graduation Program in Biotechnology and Biodiversity Federal University of Goiás GO Goiânia Brazil Laboratory of Toxicology Applied to the Environment Goiano Federal Institute Urutaí Campus. Rodovia Geraldo Silva Nascimento 25 km Zona Rural Urutaí GO Brazil Post-Graduation Program in Ecology Conservation and Biodiversity Federal University of Uberlândia MG Uberlândia Brazil Post-Graduation Program in Conservation of Cerrado Natural Resources Goiano Federal Institute Urutaí GO Brazil Department of Environmental Science and Disaster Management Noakhali Science and Technology University Noakhali3814 Bangladesh Saveetha University Tamil Nadu Chennai India Division of Biopesticides and Environmental Toxicology Sri Paramakalyani Centre for Excellence in Environmental Sciences Manonmaniam Sundaranar University Tirunelveli Tamil Nadu Alwarkurichi627 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 BegawanBE1410 Brunei Jahangirnagar University Dhaka1342 Bangladesh Laboratory of Environmental Biotechnology and Ecotoxicology Institute of Tropical Pathology and Public Health Federal University of Goiás Goiás Goiânia Brazil Department of Disaster Management Begum Rokeya University Rangpur5400 Bangladesh

The growing use of synthetic chemical compounds/substances in vector control of mosquitoes, associated with their adverse effects on the environment and non-target organisms, has demanded the development of eco-friendly alternatives. In this context, this study aimed to evaluate the larvicidal action of different cellulose microcrystalline (CMs) concentrations and investigate their toxicity mechanisms in Culex quinquefasciatus fourth instar larvae as a model species. Probit analysis revealed that the median lethal concentrations (LC50) for 24 h and 36 h exposure were 100 and 58.29 mg/L, respectively. We also showed that such concentrations induced a redox imbalance in the larvae, marked by an increase in the production of reactive oxygen species (ROS) and thiobarbituric acid reactive substances (TBARS), as well as a reduction in the activity of superoxide dismutase (SOD) and catalase (CAT). Furthermore, different alterations in the external morphology of the larvae were associated with the ingestion of CMs. On the other hand, exposure of adult zebrafish (Danio rerio) to LC5024h and LC5036h for seven days did not induce any behavioral changes or alterations mutagenic, genotoxic, biochemical, or in the pro- and anti-inflammatory response. Thus, taken together, our study demonstrates for the first time that the use of CMs can constitute a promising strategy in the control of C. quinquefasciatus larvae, combining insecticidal efficiency with an "eco-friendly" approach in the fight against an important mosquito vector of several human diseases. © 2023, The Authors. All rights reserved.

关键词： Cellulose

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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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Improving iPSC Differentiation Using a Nanodot Platform

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ACS Applied materials and Interfaces 2024年第28期16卷 36030-36046页

作者： Chiew, Men Yee Wang, Erick Lan, Kuan-Chun Lin, Yan-Ren Hsueh, Yu-Huan Tu, Yuan-Kun Liu, Chu-Feng Chen, Po-Chun Lu, Huai-En Chen, Wen Liang Center for Regenerative Medicine and Cellular Therapy National Yang Ming Chiao Tung University Hsinchu300 Taiwan Department of Biological Science and Technology National Yang Ming Chiao Tung University Hsinchu300 Taiwan College of Biological Science and Technology Industrial Ph. D. Program National Yang Ming Chiao Tung University Hsinchu300 Taiwan Kyoto University Kyoto606-8397 Japan Department of Emergency and Critical Care Medicine Changhua Christian Hospital Changhua500 Taiwan Department of Post Baccalaureate Medicine College of Medicine National Chung Hsing University Taichung402 Taiwan School of Medicine Kaohsiung Medical University Kaohsiung807 Taiwan School of Medicine Chung Shan Medical University Taichung402 Taiwan College of Biological Science and Technology National Yang Ming Chiao Tung University Hsinchu300 Taiwan Department of Orthopedic Surgery E-Da Hospital I-Shou University Kaohsiung824 Taiwan Emergency Medicine Department Kaohsiung Chang Gung Memorial Hospital Kaohsiung833 Taiwan Ph. D. Degree Program of Biomedical Science and Engineering National Yang Ming Chiao Tung University Hsinchu300 Taiwan Institute of Materials Science and Engineering National Taipei University of Technology Taipei106 Taiwan Institute of Biochemistry and Molecular Biology National Yang Ming Chiao Tung University Hsinchu300 Taiwan Bioresource Collection and Research Center Food Industry Research and Development Institute Hsinchu City300 Taiwan

Differentiation of induced pluripotent stem cells (iPSCs) is an extremely complex process that has proven difficult to study. In this research, we utilized nanotopography to elucidate details regarding iPSC differentiation by developing a nanodot platform consisting of nanodot arrays of increasing diameter. Subjecting iPSCs cultured on the nanodot platform to a cardiomyocyte (CM) differentiation protocol revealed several significant gene expression profiles that were associated with poor differentiation. The observed expression trends were used to select existing small-molecule drugs capable of modulating differentiation efficiency. BRD K98 was repurposed to inhibit CM differentiation, while iPSCs treated with NSC-663284, carmofur, and KPT-330 all exhibited significant increases in not only CM marker expression but also spontaneous beating, suggesting improved CM differentiation. In addition, quantitative polymerase chain reaction was performed to determine the gene regulation responsible for modulating differentiation efficiency. Multiple genes involved in extracellular matrix remodeling were correlated with a CM differentiation efficiency, while genes involved in the cell cycle exhibited contrasting expression trends that warrant further studies. The results suggest that expression profiles determined via short time-series expression miner analysis of nanodot-cultured iPSC differentiation can not only reveal drugs capable of enhancing differentiation efficiency but also highlight crucial sets of genes related to processes such as extracellular matrix remodeling and the cell cycle that can be targeted for further investigation. Our findings confirm that the nanodot platform can be used to reveal complex mechanisms behind iPSC differentiation and could be an indispensable tool for optimizing iPSC technology for clinical applications. © 2024 The Authors. Published by American Chemical Society.

关键词： Efficiency

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Catharanthus roseus-mediated CuAl2O4 nanocomposites for evaluation of killing kinetics

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Chemosphere 2024年 359卷 142369页

作者： Potbhare, Ajay K. Yerpude, Sachin Daddemal-Chaudhary, Ankita R. Lambat, Ashish Mondal, Aniruddha Dadure, Kanhaiya M. Rai, Alok R. Abdala, Ahmed Chaudhary, Ratiram G. Department of Chemistry S. K. Porwal College of Arts and Science and Commerce Kamptee441001 India Department of Microbiology S. K. Porwal College of Arts and Science and Commerce Kamptee441001 India Lady Amritabai Daga College for Women of Arts Commerce and Science Nagpur440010 India Post Graduate Teaching Department of Botany RTM Nagpur University Nagpur440033 India Department of Biology Sevadal Mahila Mahavidyalaya Nagpur India Division of Materials Science Lulea University of Technology Lulea97187 Sweden Department of Chemistry Bajaj College of Science Wardha India Chemical Engineering Program Texas A&M University at Qatar Doha Qatar

The present article portrayed on the killing kinetic of human pathogenic bacteria using bioinspired mesoporous CuAl2O4 nanocomposites (NCs). The NCs was fabricated using leaf extract of medicinal plant Catharanthus roseus (CR) as a green reducer and stabilizer. As bio-fabricated material was calcined at 800 °C and characterized by several analytical techniques like X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Ultraviolet–Visible Diffuse Reflectance Spectroscopy (UV-DRS), Energy Dispersive X-Ray Spectroscopy (EDS), X-Ray Photoelectron Spectroscopy (XPS), Raman, Brunauer-Emmett-Teller (BET), Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM) to authenticate its structure, phase, chemical bonding, chemical state, size and morphology behaviors. XRD and TEM revealed a reduced crystallite and nanoscale sizes of biosynthesized NCs. Moreover, XRD study exposed a cubic-structure of material, while transmission electron microscopy rendered an average particles size in range 10–15 nm. However, BET profile advocates a mesoporous nature of the particles. An effective biological molecular docking modulation assessed by substituting natural inhibitor by bioinspired NCs, while the protein PDB ID 4Z8D FabH as a receptor site for the present investigation. After assessment of molecular docking examination, the antibacterial activity of bioinspired NCs were performed against Staphylococcus aureus, Bacillus subtillis, Klebsiella pneumoniae and Escherichia coli using agar-well method. The broth culture method was employed on different pathogenic strains by kinetic growth assays and colony forming unit. © 2024 Elsevier Ltd

关键词： Nanocomposites

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Sensitization of TiO2 nanoparticles with natural dyes extracts for photocatalytic activity under visible light

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Dyes and Pigments 2020年 182卷 108654-108654页

作者： Goulart, Silviany Jaramillo Nieves, Leidy Johana Dal Bó, Alexandre Gonçalves Bernardin, Adriano Michael Graduation Program on Materials Science and Engineering Universidade Do Extremo Sul Catarinense CriciúmaSanta Catarina88806000 Brazil

Titanium dioxide (TiO2) is the most used semiconductor for heterogeneous photocatalysis. However, TiO2 is activated only by ultraviolet radiation (wavelength less than 390 nm) and only 5% of the sunlight spectrum corresponds to the UV radiation, therefore restricting the efficiency of titania catalysts. Aiming to obtain more efficient photocatalytic TiO2 nanoparticles under visible light, the goal of this study is the sensitization of this semiconductor with natural dye extracts, consequently enabling the absorption of energy in the visible light spectrum. Four natural dyes were used, blackberry and hibiscus (anthocyanins group) and urucum and curcuma (carotenoids group), which were extracted by the solid-liquid extraction method. The Evonik P25 titanium dioxide was used and the sensitization of the nanoparticles was by the liquid route. Samples were characterized by UV–visible spectrophotometry, differential thermal analysis and thermal gravimetric analysis (DTA/TGA), Fourier-transform infrared spectroscopy (FTIR) and pH control. A solution of curcuma was used to determine the photocatalytic activity of the sensitized TiO2 NPs under visible light. As a result, TiO2 without sensitization degraded only 11% of the dye solution, whereas the sensitized catalysts degraded on a range of 51–73%, showing that sensitized TiO2 nanoparticles have a significant increase in the degradability of organic compounds under visible light. The sensitization of TiO2 nanoparticles with natural dye extract has a great potential to increase the photocatalytic efficiency in the visible spectrum, especially in environments without ultraviolet radiation. © 2020 Elsevier Ltd

关键词： Titanium dioxide

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Effects of oxygen availability on Nb-Si multilayer processed by plasma transferred arc

Effects of oxygen availability on Nb-Si multilayer processed...

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materials science and Technology 2019, MS and T 2019

作者： Cardozo, Eloisa Pereira D'Oliveira, Ana Sofia C.M. Post Graduation Program on Materials Science and Engineering Universidade Federal do Paraná Curitiba Paraná Brazil Department of Mechanical Engineering Universidade Federal do Paraná Curitiba Paraná Brazil

ISBN: (纸本)0873397703

The need for higher propulsive and thermal efficiency in high temperature equipment has induced the search for materials that can withstand such harsh operating conditions. Within this group, the Nb-Si alloy system offers an attractive set of properties although they still present a challenge regarding the effects of oxygen. To address the role of processing environment on microstructure and oxidation performance of a Nb-Si multilayer, a powder mixture (Nb37wt%Si) were deposited under an argon atmosphere and in air. NbSi2 and Nb5Si3 were identified in multilayers processed with Nb37wt%Si mixture. The argon atmosphere accounts for changes in phase morphology and also for the enhanced oxidation resistance. This behavior can be accounted for by the high solubility of oxygen on silicides, that contributes to entrap oxygen in multilayers processed in air compromising oxidation performance. © 2019 MS&T19®

关键词： 3D printers

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