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Ara mostrant els elements 1-20 d 65

    • openAccess   A scalable electron beam irradiation platform applied for allotropic carbon transformation 

      De Campos da Costa, Joao Paulo; Teodoro , Vinícius; Assis, Marcelo de; Bettini, Jefferson; Andres, Juan; Pereira do Carmo, Joao Paulo; Longo, Elson Elsevier (2021-04-15)
      The design of solid-state materials whose properties and functions can be manipulated in a controlled manner by the application of electron beam irradiation is important in modern materials chemistry and physics. In this ...

    • closedAccess   A Tale of Reactive Oxygen Species on the Ag3PO4(110) Surface 

      Lipsky, Felipe; da Silveira Lacerda, Luis Henrique; Gracia, Lourdes; G Foschiani, Beatriz; Assis, Marcelo de; Oliva, Mónica; Longo, Elson; Andres, Juan; San-Miguel, Miguel A. American Chemical Society (2023-12-07)
      Herein, we report a study of Ag3PO4 microcrystals in the accomplishment of their enhanced degradation process and bactericidal activity. Based on experimental results and density functional theory free energy profiles, we ...

    • openAccess   Ag Nanoparticles/AgX (X=Cl, Br and I) Composites with Enhanced Photocatalytic Activity and Low Toxicological Effects 

      Assis, Marcelo de; Groppo Filho, Francisco C.; Pimentel, Dayene S.; Gouveia, Amanda; Tassia F. D., Castro; Fukushima, Hirla C. S.; Foggi, Camila Cristina; da Costa, João P. C.; Borra, Ricardo Carneiro; Andres, Juan; Longo, Elson Wiley (2020-04-23)
      Periodic structures induced by electron irradiation are a unique phenomenon when electron beams irradiate on the surface of some materials. These periodic structures have potential for technological applications. However, ...

    • openAccess   Ag Nanoparticles/α-Ag2WO4 Composite Formed by Electron Beam and Femtosecond Irradiation as Potent Antifungal and Antitumor Agents 

      Assis, Marcelo de; Robeldo, Thaiane; Foggi, Camila Cristina; Kubo, A.M.; Mínguez-Vega, Gladys; Cordoncillo, Eloisa; Beltrán Mir, Héctor; Torres-Mendieta, Rafael; Andres, Juan; Oliva, Mónica; Vergani, Carlos; Barbugli, P.A.; Camargo, E.R.; Borra, Ricardo Carneiro; Longo, Elson Nature Research (2019)
      The ability to manipulate the structure and function of promising systems via external stimuli is emerging with the development of reconfigurable and programmable multifunctional materials. Increasing antifungal and antitumor ...

    • openAccess   An Experimental and Computational Study of β-AgVO3: Optical Properties and Formation of Ag Nanoparticles 

      Oliveira, Regiane; Assis, Marcelo de; Teixeira, Mayara Mondego; Penha da Silva, Maya Dayana; Siu Li, Maximo; Andres, Juan; Gracia, Lourdes; Longo, Elson ACS Publications (2016-05-19)
      This article aims to gather together in one place and for first time the formation process of Ag nanoparticles (NPs) on β-AgVO3 crystals, driven by an accelerated electron beam from an electronic microscope under high ...

    • openAccess   Analysis of the Pb0.30CaxSryTiO3 ternary system: The effect of Ca2+ and Sr2+ cations on the electrical properties of PbTiO3 

      Gouveia, Amanda; Ribeiro , Lara Kelly; Assis, Marcelo de; Longo, Elson; Andres, Juan; pontes, fenelon Sao Paulo State University. Institute of Chemistry (2022-08-17)
      Powder and thin films of the Pb0.30Ca0.10Sr0.60TiO3 (PCST 30/10/60) and Pb0.30Ca0.60Sr0.10TiO3 (PCST 30/60/10) ternary system were synthetized by the polymeric precursor method and the thin films deposited on the Si/SiO2/Ti/Pt ...

    • openAccess   Antiviral leather: A functional coating based on SiO2-AgNPs to eliminate pathogens 

      Marques, Gleison N.; Reis, Roberta Y.N.; Ribeiro , Lara Kelly; Simões, Luiz G.P.; Minozzi, Daniel; Andres, Juan; Assis, Marcelo de; Mascaro, Lucia; Longo, Elson Elsevier (2023-09-12)
      A bovine leather material functionalized with SiO2-Ag nanoparticles (NPs) composite, which possesses highly efficient antimicrobial activity against the SARS-CoV-2 virus and Staphylococcus aureus (S. aureus) bacteria, has ...

    • openAccess   Bactericidal activity of Ag4V2O7/β-AgVO3 heterostructures against antibiotic-resistant Klebsiella pneumoniae 

      Assis, Marcelo de; Soares da Silva, Jussara; Ottaiano Gonçalves, Mariana; de Almeida Rodolpho, Joice Margareth; Dias de Lima Fragelli, Bruna; Corte, Ana Beatriz Pereira; Ribeiro , Lara Kelly; Daldin Teodoro, Marcio; de Freitas Anibal, Fernanda; de Sousa, Cristina Paiva; Oliveira, Osvaldo N.; Andres, Juan; Longo, Elson Elsevier (2022-10)
      Although Ag-based materials are efficient against antibiotic-resistant bacteria, their high toxicity to living organisms represents a major challenge for obtaining useful products. In this work, we report the bactericidal ...

    • openAccess   Bioactive Ag3PO4/Polypropylene Composites for Inactivation of SARS-CoV?2 and Other Important Public Health Pathogens 

      Ribeiro , Lara Kelly; Assis, Marcelo de; R. Lima, Lais; Coelho, Dyovani; Gonçalves, Mariana O.; Paiva, Robert; Moraes, Leonardo N; Fogaça de Almeida, Lauana; Lipsky, Felipe; San-Miguel, Miguel A.; Mascaro, Lucia; Grotto, Rejane Maria Tommasini; Sousa, Cristina P; Rosa, Ieda; Cruz, Sandra A; Andres, Juan; Longo, Elson American Chemical Society (2021-09-21)
      The current unprecedented coronavirus pandemic (COVID-19) is increasingly demanding advanced materials and new technologies to protect us and inactivate SARS-CoV-2. In this research work, we report the manufacture of Ag3PO4 ...

    • openAccess   Biocompatibility and inflammatory response of silver tungstate, silver molybdate, and silver vanadate microcrystals 

      Alves da Silva Pimentel, Bruna Natalia; De Annunzio, Sarah Raquel; Assis, Marcelo de; Barbugli, Paula; Longo, Elson; Vergani, Carlos Eduardo (2023)
      Silver tungstate (α-Ag2WO4), silver molybdate (β-Ag2MoO4), and silver vanadate (α-AgVO3) microcrystals have shown interesting antimicrobial properties. However, their biocompatibility is not yet fully understood. ...

    • openAccess   Bridging experiment and theory: Morphology, optical, electronic, and magnetic properties of MnWO4 

      Assis, Marcelo de; Tello, Ana C.M.; Abud, Fabio S.A.; Negre, Pablo; Ribeiro , Lara Kelly; Ribeiro, Renan A.P.; Masunaga, Sueli H.; Lima, Aline E.B.; Luz Jr, Geraldo; Jardim, Renato F.; da Silva, Albérico B. F.; Andres, Juan; Longo, Elson Elsevier (2022-10-30)
      Manganese tungstate (MnWO4) compounds have gathered tremendous interest in the research community due to their wide range of applications. Herein, we show a comprehensive experimental, theoretical and computational study ...

    • openAccess   Carbon Black CB-EDA Nanoparticles in Macrophages: Changes in the Oxidative Stress Pathway and in Apoptosis Signaling 

      Rodolpho, Joice Margareth de Almeida; de Godoy, Krissia Franco; Brassolatti, Patricia; Dias de Lima Fragelli, Bruna; Camillo, Luciana; Castro, Cynthia Aparecida de; Assis, Marcelo de; Speglich, Carlos; Longo, Elson; Anibal, Fernanda de Freitas MDPI (2023-06)
      The influence of black carbon nanoparticles on J774.A1 murine cells was investigated with the objective of exploring the cytotoxicity of black carbon functionalized with ethylenediamine CB-EDA. The results showed that ...

    • openAccess   Carbon Nanofibers versus Silver Nanoparticles: Time-Dependent Cytotoxicity, Proliferation, and Gene Expression 

      Salesa Landete, Beatriz; Assis, Marcelo de; Andres, Juan; Serrano-Aroca, Ángel MDPI (2021-09-03)
      Carbon nanofibers (CNFs) are one-dimensional nanomaterials with excellent physical and broad-spectrum antimicrobial properties characterized by a low risk of antimicrobial resistance. Silver nanoparticles (AgNPs) are ...

    • closedAccess   Comprehensive experimental and theoretical studies on the synthesis and characterization of electrodeposited nanostructured Cu2O thin films 

      Gonçalves, Cristiane B.; Da Silva, Rafael T.; Dalenogare, Gustavo; Gonzaga, Isabelle M.D.; Mascaro, Lucia; Ferrer, Mateus M.; Assis, Marcelo de; Longo, Elson; de Carvalho, Hugo B.; Doriguetto, Antonio Carlos Elsevier (2023-11-01)
      In this study, we present a comprehensive analysis of the morphology, microstructure, and optical properties of electrodeposited Cu2O thin films on SnO2:F (FTO) substrates. The films were synthesized using the galvanostatic ...

    • openAccess   Connecting morphology and photoluminescence emissions in β-Ag2MoO4 microcrystals 

      Teodoro , Vinícius; Gouveia, Amanda; Machado, Thales Rafael; Barrios Trench, Aline; jacomaci, natalia; Assis, Marcelo de; Marques, Gilmar Eugenio; Daldin Teodoro, Marcio; San-Miguel, Miguel A.; Andres, Juan; Bettini, Jefferson; Longo, Elson Elsevier (2021-10-23)
      This work elucidates the morphology-photoluminescence (PL) emission relationships, based on experimental and calculated results, on β-Ag2MoO4 samples synthesized by microwave-assisted hydrothermal method. It was shown that ...

    • closedAccess   Connecting structural, optical, and electronic properties and photocatalytic activity of Ag3PO4:Mo complemented by DFT calculations 

      Barrios Trench, Aline; Machado, Thales Rafael; Gouveia, Amanda; Assis, Marcelo de; da Trindade, Letícia; Santos, Clayane; Perrin, Andre; Perrin, Christiane; Oliva, Mónica; Andres, Juan; Longo, Elson Elsevier (2018-12-15)
      The present join experimental and theoretical work provides in-depth understanding on the relationship among structural, optical, and electronic properties and photocatalytic activity of Ag3PO4:Mo microcrystals. We prepared ...

    • openAccess   Connecting Theory with Experiment to Understand the Sintering Processes of Ag Nanoparticles 

      da Silva, Edison; Faccin, Giovani M.; Machado, Thales Rafael; Guerra Macedo, Nadia; Assis, Marcelo de; Maya Johnson, Santiago; Sczancoski, Júlio César; Andres, Juan; Longo, Elson; San-Miguel, Miguel A. American Chemical Society (2019-04)
      A complementary combination of long-time atomistic molecular dynamics simulations and real-time transmission electron microscopy (TEM) images has been utilized for unraveling, at an atomic resolution, the nature of the ...

    • openAccess   Cytotoxic Effects Caused by Functionalized Carbon Nanotube in Murine Macrophages 

      Godoy, Krissia; rodolpho, joice; Dias de Lima Fragelli, Bruna; Camillo, Luciana; Brassolatti, Patricia; Assis, Marcelo de; Nogueira, Camila; Speglich, Carlos; Longo, Elson; Anibal, Fernanda de Freitas Cell Physiol Biochem Press (2022-09-28)
      Background/Aims: The development of new nanomaterials has been growing in recent decades to bring benefits in several areas, especially carbon-based nanoparticles, which have unique physical-chemical properties and allow ...

    • openAccess   Disclosing the Electronic Structure and Optical Properties of Ag4V2O7 crystals: Experimental and Theoretical Insights 

      Oliveira, Regiane; Gracia, Lourdes; Assis, Marcelo de; Siu Li, Maximo; Andres, Juan; Longo, Elson; Cavalcante, Laécio Santos Royal Society of Chemistry (2016)
      This work combines experimental and computational techniques to exploit the best of both methodologies and thus provide a tool for understanding the geometry, cluster coordination, electronic structure, and optical ...

    • openAccess   Disclosing the nature of vacancy defects in α-Ag2WO4 

      Assis, Marcelo de; Castro, M. S.; Aldao, C. M.; Buono, C.; Ortega, P. P.; Teodoro, M. D.; Andres, Juan; Gouveia, Amanda; Simões, Alexandre; Longo, Elson; Macchi, C. E.; Somoza, Alberto; Moura, F.; Ponce, Miguel Adolfo Elsevier (2023-08)
      Defects at semiconductors with electron acceptor and donor sites govern the electronic and optoelectronic applications due to their unique electronic properties. This work provides deep insight into the nature of defects and ...