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SSRN 2022年

作者： Campos, João V. Lavagnini, Isabela Reis Zallocco, Vinicius Martins Ferreira, Eduardo B. de Jesus Agnolon Pallone, Eliria Maria Rodrigues, Ana Candida Martins Graduate Program in Materials Science and Engineering Federal University of São Carlos SP São Carlos13635-905 Brazil Department of Materials Engineering Federal University of São Carlos SP São Carlos13635-905 Brazil Center for Research Technology and Education of Vitreous Materials CeRTEV FAPESP LaMaV DEMa/UFSCar SP São Carlos13635-905 Brazil Department of Biosystem Engineering University of São Paulo USP Av. Duque de Caxias Norte 225 SP Pirassununga13635-900 Brazil Postgraduate Programme in Materials Science and Engineering University of São Paulo USP FZEA Av. Duque de Caxias Norte 225 Pirassununga13635-900 Brazil Department of Materials Engineering São Carlos School of Engineering University of São Paulo USP SP São Carlos13566-590 Brazil

Single-phased Li1.5Al0.5Ge1.5(PO4)3NaSICON (Na superionic conductor) glass-ceramic is obtained via a new route using flash-sinter crystallization . Green pellets of glass powder are sinter-crystallized in a few seconds. Our results suggest that controlling the current rise during the flash event is needed to avoid overheating that could cause the melting of the samples. A processing map for the flash sinter-crystallization of Li1.5Al0.5Ge1.5(PO4)3 is developed and presented based on the current density and holding time at the steady-state. The samples fabricated by flash sinter-crystallization are compared with conventionally heated ones. Using this novel technique, single-phase glass-ceramics were obtained with total ionic conductivity at room temperature surpassing those prepared by conventional heating (2.26 10-4S cm-1 and 1.36 10-4S cm-1, respectively). © 2022, The Authors. All rights reserved.

关键词： Solid electrolytes

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Phase formation, microstructural and superconducting properties of YBCO added Ca-compounds extraction eggshells

Results in Materials

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Results in materials 2025年 26卷

作者： Yap, Siew Hong Awang Kechik, Mohd Mustafa Humaidi, Syahrul Mohd Shariff, Khairul Khaizi Baqiah, Hussien Chen, Soo Kien Lim, Kean Pah Mohd Zaid, Mohd Hafiz Yaakob, Yazid Abdul Karim, Mohd Khalis Talib, Zainal Abidin Loh, Zhi Wei Kamarudin, Aliah Nursyahirah Shaari, Abdul Halim Miryala, Muralidhar Superconductor & Thin Films Laboratory Department of Physics Faculty of Science Universiti Putra Malaysia UPM Serdang Selangor Darul Ehsan 43400 Malaysia Postgraduate Program (Physics) FMIPA Universitas Sumatera Utara Medan 20222 Indonesia Microwave Research Institute Universiti Teknologi MARA Selangor Shah Alam 40450 Malaysia Shandong Key Laboratory of Biophysics Institute of Biophysics Dezhou University No. 566 University Rd. West Shandong Dezhou China Department of Physics College of Natural Sciences Jeonbuk National University 567 Baekjedaero Deokjingu Jeollabukdo Jeonjusi 54896 South Korea Materials for Energy and Environmental Laboratory Superconducting Materials Group of Science & Engineering Shibaura Institute of Technology 3-7-5 Foxesu Koto-ku Tokyo 135-8548 Japan

For several decades now, the emergence and production of high-quality bulk rare-earth-based superconductors, particularly YBa2Cu3O7-δ (YBCO/Y-123), have been noteworthy advancements with potential implications in var... 详细信息

For several decades now, the emergence and production of high-quality bulk rare-earth-based superconductors, particularly YBa₂Cu₃O_7-δ (YBCO/Y-123), have been noteworthy advancements with potential implications in various fields. This unique research investigated the potential of using chicken eggshells as a source of calcium compounds (CaO, CaCO₃ and Ca(OH)₂) for the synthesis of YBCO. The green approach synthesis of YBCO added with Ca-compounds (0.0100 wt% ≤ x ≤ 0.6000 wt%) was conducted in a systematic manner via thermal treatment method. The crystal structure, surface morphology, and chemical composition of the specimens were characterized by X-ray diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM), and Energy Dispersive X-Ray Spectroscopy (EDX). The results showed the formation of orthorhombic Y-123 phase, Pmmm space group with the high-intensity peaks of Y-123. The addition of Ca-compounds proposed a different trend of grain degradations in the YBCO matrix system with the appearance of Ca-compounds' impurity phases. The superconducting properties such as electrical resistivity analyzed using electrical resistance measurement. Surprisingly, the superconducting parameters improved after Ca-compounds were added into the YBCO system. The hole concentration, p reached the highest value among all the specimens with the lowest superconducting transition width, ∼ΔT_c = 3.805 K (T_c-onset = 93.223 K and T_{c(R = 0)} = 89.418 K) for the lowest concentration of Ca-compounds i.e., 0.0375 wt%. This great finding targeted the green approach impurity materials into YBCO system that can usefully enhance the superconducting properties at high temperature which covers the idea of addition with deficient concentration Ca-compounds. © 2025

关键词： Ca-compounds Critical temperature Grains degradations Hole concentration Superconducting transition width

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Metal-enriched nanoparticles and black carbon:A perspective from the Brazil railway system air pollution

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Geoscience Frontiers 2021年第3期12卷 624-635页

作者： Bianca D.Lima Elba C.Teixeira James C.Hower Matheus S.Civeira Omar Ramírez Cheng-Xue Yang Marcos L.S.Oliveira Luis F.O.Silva Postgraduate Program in Remote Sensing and Meteorology Geosciences InstituteUniversidade Federal do Rio Grande do SulAv.Bento Gonçalves9500Porto AlegreRS 91501–970Brazil Research Department Fundação Estadual de Proteção Ambiental Henrique Luís RoesslerAv.Borges de Medeiros261Porto AlegreRS 90020–021Brazil Center for Applied Energy Research University of Kentucky2540 Research Park DriveLexingtonKY 40511USA Postgraduate Program in Mines Metallurgy and MaterialsUniversidade Federal do Rio Grande do SulAv.Bento Gonçalves9500Porto AlegreRS 91501–970Brazil Faculty of Engineering Environmental EngineeringUniversidad Militar Nueva GranadaKm 2 CajicáZipaquiráColombia Institute of Earth Science China University of Geosciences(Beijing)29 Xueyuan RdHaidian DistrictChina Department of Civil and Environmental Universidad de la CostaCUCCalle 58#55-66BarranquillaAtlanticoColombia Universidad de Lima Departamento de Ingeniería civil y Arquitectura.Avenida Javier Prado Este 4600–Santiago de Surco 1503Peru

Having a better understanding of air pollutants in railway systems is crucial to ensure a clean public *** study measured,for the first time in Brazil,nanoparticles(NPs)and black carbon(BC)on two groundlevel platforms and inside trains of the Metropolitan Area of Porto Alegre(MAPA).An intense sampling campaign during thirteen consecutive months was carried out and the chemical composition of NPs was examined by advanced microscopy *** results showed that highest concentrations of the pollutants occur in colder seasons and influenced by variables such as frequency of the trains and passenger ***,internal and external sources of pollution at the stations were *** predominance of NPs enriched with metals that increase oxidative stress like Cd,Fe,Pb,Cr,Zn,Ni,V,Hg,Sn,and Ba both on the platforms and inside trains,including Fe-minerals as hematite and magnetite,represents a critical risk to the health of passengers and employees of the *** interdisciplinary and multi-analytical study aims to provide an improved understanding of reported adverse health effects induced by railway system aerosols.

关键词： Nanoparticles Potential hazardous elements Environmental chemistry Human health Railway environment Indoor air quality

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Morphological Characterization of Brazil Nut Tree (Bertholletia excelsa) Fruit Pericarp

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Journal of Renewable materials 2019年第7期7卷 683-692页

作者： Gustavo P.Petrechen Marcos Arduin JoséD.Ambrósio Materials Science and Engineering Postgraduate Program Federal University of São CarlosSão CarlosBrazil Center of Characterization and Materials Development Federal University of São CarlosSão CarlosBrazil Department of Botany Federal University of São CarlosSão CarlosBrazil Citlab-Science Innovation and Technology LaboratorySorocabaBrazil

This article presents the overall morphological structure of the Brazil nut tree(Bertholletia excelsa)fruit pericarp,from macro to nano *** acquired knowledge would be used for the development of new applications,like using the materials as fillers for biocomposites,or as a hierarchical architecture model for *** research was performed using stereo and light microscopy and conventional and force field emission scanning electron *** pericarp presents three layers:the exocarp,a dark gray,brittle and fragile outer layer;the mesocarp,a beige,dry,rigid,impermeable and fibrous intermediate layer;and the endocarp,an inner layer with similar characteristic as the exocarp,but formed next to the ***,the exocarp and the endocarp presented minor regions of sclereids,fibers and vascular cell bundles,inside major regions of parenchyma *** mesocarp presents a structure of fiber cells regions alternating with sclereids and vascular cells regions,arranged in a composite like arrangement,with the fibers cells bundles acting as randomly oriented disperse phases in a sclereid cells *** arrangement was associated with the mesocarp relative superior proprieties,indicating a great material for using as fillers for biocomposites or in biomimetics applications.

关键词： Bertholletia excelsa brazil nut fruit pericarp morphological structure microscopy

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Antimicrobial Potential of Linear Low-Density Polyethylene Food Packages with Ag Nanoparticles in Different Carriers (Sio2 and Hap)

SSRN

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SSRN 2023年

作者： da Costa Brito, Sabrina Pereira, Vinicius Alex Cano Prado, Ana Carolina Figueiredo Tobias, Thais Juliana Paris, Elaine Cristina Ferreira, Marcos David São Paulo State University "Julio de Mesquita Filho" Rod. Araraquara Jaú Km 01 SP Araraquara14800-903 Brazil Embrapa Instrumentação Rua XV de Novembro 1452 SP São Carlos13560-970 Brazil Biotechnology Graduate Program Federal University of São Carlos Rod. Washington Luís Km 235 – C. P.676 SP São Carlos13.565-905 Brazil Postgraduate Program in Materials Science and Engineering Federal University of São Carlos Rod. Washington Luís Km 235 – C. P.676 SP São Carlos13.565-905 Brazil Chemistry Graduate Program University of Sao Paulo Av. Trabalhador São-carlense 400 SP São Carlos13.560-970 Brazil Postgraduate Program in Chemistry Federal University of São Carlos Rod. Washington Luís Km 235 – C. P.676 SP São Carlos13.565-905 Brazil

This study intended to verify the antimicrobial efficacy of linear low-density polyethylene films incorporated with silver nanoparticles dispersed in silica and hydroxyapatite carriers at different concentrations. The silver nanoparticles showed a superior inhibitory action on S. aureus and hydroxyapatite was more effective, being this a potential for use in food packaging. © 2023, The Authors. All rights reserved.

关键词： Polymer films

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Synthesis, Characterization, and performance test of modified Zeolite-Si/Al nanocomposite from pumice and waste cans using slow pyrolysis process for removal pollutant parameters from hard water

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Environmental Nanotechnology, Monitoring and Management 2023年 20卷

作者： Gusti Wibowo, Yudha Sudibyo Rianjanu, Aditya Taher, Tarmizi Susanti, Noni Karo Karo, Pulung Suprihatin Iman Supriyatna, Yayat Prasetyo, Erik Bahfie, Fathan Amin, Muhammad Syarifuddin, Hutwan Safitri, Hana Khairurrijal, Khairurrijal Department of Mining Engineering Institut Teknologi Sumatera Lampung-35365 Indonesia Research Center for Mining Technology National Research and Innovation Agency Lampung Indonesia Department of Material Engineering Institut Teknologi Sumatera Lampung-35365 Indonesia Department of Environmental Engineering Institut Teknologi Sumatera Lampung-35365 Indonesia Physics Department Universitas Lampung Lampung Indonesia Department of Environmental Science Postgraduate Program Universitas Jambi Jambi 36122 Indonesia Laboratory of Mine Environmental Department of Mining Engineering Institut Teknologi Sumatera Lampung-35365 Indonesia Department of Physics Institut Teknologi Sumatera Lampung-36365 Indonesia Department of Physics Institut Teknologi Bandung Bandung 40132 Indonesia Center for Green and Sustainable Materials Institut Teknologi Sumatera Indonesia

Hard water is one of crucial problems in the world due to its pollutant parameters. Adsorption is a promising method for treating hard water because of its benefits such as low-cost, easy to use, acceptable, and easy to maintenance. In this study, we utilized zeolite functionalized with silicon/aluminum (Ze-Si/Al) as adsorbent materials for hard water treatment. Ten different ratios of Si/Al were added into zeolite by modifying the solid waste source concentration (pumice and cans). The optimum sample was then further tested with different parameters including contact time, dye concentration, and isotherm models. The zeolite-Si/Al adsorbent was characterized by Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD), and X-Ray Fluorescence (XRF). Results of this study have showed that the best functionalized zeolite was that with Si/Al ratio 0.67, which has higher sorption ability. In contact time test, the equilibrium was reached after 300 min. This study also informed that the concentration of dyes will give impact on removal of pollutant parameters. Isotherm model of Ze-Si/Al fitted with Langmuir method. This study also discussed the potential development and future research direction. Thus, this study is a crucial report to develop the information about waste utilization as source of Si/Al to increasing quality of zeolite. © 2023 Elsevier B.V.

关键词： Adsorption Hard water Wastewater Wastewater treatment zeolite-Si/Al

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Fabrication of silica-nypa membrane applied for water desalination

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AIP Conference Proceedings 2024年第1期2710卷

作者： Muthia Elma Isna Syauqiah Era N. R. Oktaviana Siti Fatimah Aulia Rahma Awali Sir Kautsar Harivram Erdina L. A Rampun Chemical Engineering Department Engineering Faculty Lambung Mangkurat University JL. A. Yani KM 36 Banjarbaru South Kalimantan 70714 Indonesia Materials and Membranes Research Group (M2ReG) Lambung Mangkurat University JL. A.Yani KM 36 Banjarbaru South Kalimantan 70714 Indonesia Doctoral Program of Environmental Science postgraduate Program Lambung Mangkurat University Jl. Brigjen H Hasan Basri Kayutangi Banjarmasin South Kalimantan 70123 Indonesia

Carbon source as a template derived from nypa leaf powder enable to strengthen the silica matrix applied for water desalination. This research aims to synthesize silica-nypa membrane, characterize xerogel silica-nypa leaf and investigate the performance of silica-nypa membrane with various concentration of nypa as a carbon template to treat artificial sea water. The concentrations of nypa leaf as a carbon template are 0.1; 0.5 and 2.5 %wt with a calcination temperature of 350 °C through a rapid thermal processing (RTP) technique. Xerogel characterization using FTIR was employed to analyze a spectrum and Scanning Electron Microscopy (SEM) to investigate the membrane morphology. The result shows that the performance of silica-nypa membrane with water fluxes of 2.1915; 2.0163 and 1.1067 kg.m−2. h−1 (for 0.1; 0.5 and 2.5 %wt. carbon template derived from nypa leaf), and the salt rejection value for all concentrations.

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Date fruit melanin is primarily based on (-)-epicatechin proanthocyanidin oligomers( vol 14 , 4863 , 2024)

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SCIENTIFIC REPORTS 2024年第1期14卷 1-12页

作者： Alam, Muneeba Zubair Okonkwo, Clinton Emeka Cachaneski-Lopes, Joao P. Graeff, Carlos F. O. Batagin-Neto, Augusto Tariq, Saeed Varghese, Sabu O'Connor, Matthew J. Albadri, Abuzar E. Webber, J. Beau W. Tarique, Mohammed Ayyash, Mutamed Kamal-Eldin, Afaf Department of Food Science College of Agriculture and Veterinary Medicine United Arab Emirates University P.O. Box: 15551 Al-Ain United Arab Emirates National Water and Energy Center (NWEC) United Arab Emirates University P.O. Box: 15551 Al-Ain United Arab Emirates Postgraduate Program in Materials Science and Technology (POSMAT) São Paulo State University (UNESP) Bauru SP Brazil Department of Physics School of Sciences São Paulo State University (UNESP) Bauru SP Brazil Institute of Sciences and Engineering São Paulo State University (UNESP) Itapeva SP Brazil Department of Anatomy College of Medicine and Health Sciences United Arab Emirates University Al Ain United Arab Emirates Core Technology Platforms New York University Abu Dhabi 129188 Abu Dhabi United Arab Emirates Department of Chemistry College of Science Qassim University 51452 Buraidah Saudi Arabia Lab-Tools Ltd. Marlowe Innovation Centre Marlowe Way Ramsgate CT12 6FA UK

Plant-based melanin seems to be abundant, but it did not receive scientific attention despite its importance in plant biology and medicinal applications, e.g. photoprotection, radical scavenging, antimicrobial properties, etc. Date fruit melanin (DM) has complex, graphene-like, polymeric structure that needs characterization to understand its molecular properties and potential applications. This study provides the first investigation of the possible molecular composition of DM. High performance size-exclusion chromatography (HPSEC) suggested that DM contains oligomeric structures (569–3236 Da) and transmission electron microscopy (TEM) showed agglomeration of these structures in granules of low total porosity (10–1000 Å). Nuclear magnetic resonance (NMR) spectroscopy provided evidence for the presence of oligomeric proanthocyanidins and electron paramagnetic resonance (EPR) spectroscopy revealed a g-factor in the range 2.0034–2.005. Density functional theory (DFT) calculations suggested that the EPR signals can be associated with oligomeric proanthocyanidin structures having 4 and above molecular units of (−)-epicatechin. The discovery of edible melanin in date fruits and its characterization are expected to open a new area of research on its significance to nutritional and sensory characteristics of plant-based foods.

关键词： Phoenix dactylifera L. (−)-Epicatechin Date fruit Melanin Proanthocyanidins

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Alkali-Activated Eco-Friendly Mixtures with Low-Processed Sugarcane Bagasse Ash—Physical, Mechanical, and Microstructural Properties

SSRN

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SSRN 2022年

作者： Lima, Victor Estolano de Estolano, Amanda Marques Lopes Almeida, Yeda Medeiros Bastos de Henrique, Mariana Alves Araújo, Fernanda Wanderley Corrêa de Melo Neto, Antonio Acacio de Federal University of Pernambuco Department of Civil and Environmental Engineering LabTag Av. da Arquitetura Recife Brazil Federal University of Pernambuco National Institute of Welding Technology and Coating of Materials INTM Rua da Inovação Recife Brazil Federal University of Pernambuco Institute for Petroleum and Energy Research LITPEG Petrochemical Laboratory Av. da Arquitetura Recife Brazil Federal University of Pernambuco Postgraduate Program in Materials Science Av. Jorn. Aníbal Fernandes Recife Brazil Federal Rural University of Pernambuco Department of Rural Technology Rua Cento e Sessenta e Três Cabo de Santo Agostinho Brazil

In this study, sugarcane bagasse ash was used to evaluate the physical, mechanical, and microstructural properties of eco-friendly alkali-activated mixtures with blast furnace slag. Net sodium silicate and solid metasilicate were used as activators to produce conventional and one-part alkali-activated mixtures, respectively. Two types of sugarcane bagasse ash were analyzed: raw (as-received) and calcined. The low number of proposed processes reduces the economic aggregate cost of recycled ash. Further, the blast furnace slag replacement ratios of raw and calcined sugarcane bagasse ash were 10%, 30%, 50%, and 70%. Mortars were prepared for the compressive and flexural strength tests, water absorption, and dry density. Alternatively, X-ray diffraction, thermogravimetry, infrared spectroscopy, and scanning electron microscopy were used to assess the chemical, mineralogical, and microstructural properties of the prepared pastes. In addition, the fresh test was performed using the flow table test, wherein the spread diameter decreased as the SBA content increased, primarily on the raw ash owing to its high organic material content. Moreover, compressive strength results showed that the compressive strength increased after 3 days for mixtures with 10% and 30% SBA. However, at 28 days, there was a decrease with an increase in the SBA content. Similar behavior was observed in the flexural strength and water absorption tests. Tests on pastes verified the probable presence of alternative phases besides C-(A)-S-H, such as pectolite, brucite, hydrotalcite, and zeolites. In addition, through the combination of scanning electron microscopy and energy dispersive spectroscopy techniques, the presence of preserved cellular structure was observed in the alkali-activated matrix, and Ca/Si and Si/Al ratios were calculated. It was concluded that the low reactivity of raw sugarcane bagasse ash and the low reactivity of both ashes significantly decreased mechanical performance. Furthermor

关键词： Slags

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Correction to: SARS-CoV-2 removal with a polyurethane foam composite

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Environmental science and pollution research international 2023年第8期30卷 22033页

作者： Guilherme Pereira Schoeler Thays França Afonso Carolina Faccio Demarco Victor Dos Santos Barboza Tito Roberto Sant'anna Cadaval Andrei Valerão Igansi Marcos Alexandre Gelesky Janice Luehring Giongo Rodrigo de Almeida Vaucher Rafael de Avila Delucis Robson Andreazza Postgraduate Program in Environmental Sciences Center for Engineering Federal University of Pelotas R. Benjamin Constant 989 Pelotas RS CEP 96010-020 Brazil. Postgraduate Program in Materials Science and Engineering Federal University of Pelotas R. Gomes Carneiro 01 Pelotas RS CEP 96010-610 Brazil. Graduate Program in Biochemistry and Bioprospecting Research Laboratory in Biochemical and Molecular Biology of Microorganisms (LaPeBBiOM) Federal University of Pelotas RS Av. Eliseu Maciel Campus Universitário s/n Capão Do Leão CEP 96160-000 Brazil. School of Chemistry and Food Federal University of Rio Grande Av. Itália Km 8 s/n Rio Grande RS CEP 96203-000 Brazil. Postgraduate Program in Environmental Sciences Center for Engineering Federal University of Pelotas R. Benjamin Constant 989 Pelotas RS CEP 96010-020 Brazil. robsonandreazza@yahoo.com.br. Postgraduate Program in Materials Science and Engineering Federal University of Pelotas R. Gomes Carneiro 01 Pelotas RS CEP 96010-610 Brazil. robsonandreazza@yahoo.com.br.

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