Zobrazeno 1 - 10
of 325
pro vyhledávání: '"Nilson S"'
Autor:
Francisca J.R. Tavares, Matheus S.C. de Oliveira, Ariosvaldo J.S. Silva, Iara de F. Gimenez, Verônica C. Teixeira, Nilson S. Ferreira, Marcos V. dos S. Rezende
Publikováno v:
Optical Materials: X, Vol 21, Iss , Pp 100294- (2024)
Scintillators based on YVO4:Er3+ and YVO4:Er3+, Nd3+, synthesized through glucose-assisted sol-gel method and calcined under different temperatures were studied via X-ray excited optical luminescence (XEOL). The samples' crystalline structure was stu
Externí odkaz:
https://doaj.org/article/ee98b7c37d8747dd922ca1b5a9217fc5
Autor:
Daniel V. Ribeiro, Nilson S. Amorim Júnior, Bruna S. Santos, Henrique A. Santana, Silas A. Pinto
Publikováno v:
Case Studies in Construction Materials, Vol 19, Iss , Pp e02466- (2023)
Reinforcement corrosion is a problem affecting the durability of most concrete structures. When concrete is employed without proper care, it may function inadequately as a barrier, allowing aggressive ions or acidic substances in the atmosphere to at
Externí odkaz:
https://doaj.org/article/4553ab5a969c4295921f490f979c0337
Autor:
Robert S. Matos, John M. Attah-Baah, Michael D.S. Monteiro, Benilde F.O. Costa, Marcelo A. Mâcedo, Romualdo S. Silva Junior, Henrique D. da Fonseca Filho, Rosane M.P.B. Oliveira, Nilson S. Ferreira
Publikováno v:
Journal of Materials Research and Technology, Vol 22, Iss , Pp 2673-2689 (2023)
Herein, we have explored the defects-driven photocatalytic properties of ZnO nanoparticles synthesized using different sweet Amapá-latex contents as natural chelating agents. XRD, SAED, and FTIR analyses confirmed the formation of single-phase ZnO n
Externí odkaz:
https://doaj.org/article/db9f7c11cd394a3bb3bcb1ecfdcaf31b
Autor:
Nayane O. Chaves, Lucas S. Lima, Michael D. S. Monteiro, Raimundo A. L. Sobrinho, Nilson S. Ferreira, Glenda Q. Ramos, Henrique D. da Fonseca Filho, Rosane M. P. B. Oliveira, Robert S. Matos
Publikováno v:
Materials, Vol 17, Iss 4, p 818 (2024)
Blast furnace dust waste (BFDW) proved efficient as a photocatalyst for the decolorization of methylene blue (MB) dye in water. Structural analysis unequivocally identified α-Fe2O3 as the predominant phase, constituting approximately 92%, with a por
Externí odkaz:
https://doaj.org/article/f9059dc898dc4e2b925eaaf979546467
Autor:
Atefeh Ghaderi, Azizollah Shafiekhani, Shahram Solaymani, Ştefan Ţălu, Henrique Duarte da Fonseca Filho, Nilson S. Ferreira, Robert Saraiva Matos, Hadi Zahrabi, Laya Dejam
Publikováno v:
Scientific Reports, Vol 12, Iss 1, Pp 1-9 (2022)
Abstract In this study, we investigated the morphology of synthesized Cu/Ni nanoparticles in trace of carbon sources by the co-deposition process of RF sputtering and RF-PECVD methods and localized surface plasmon resonance of CO gas sensing of Cu/Ni
Externí odkaz:
https://doaj.org/article/4f665dd8256e4845a519c6184b0bbf08
Autor:
Victor Teixeira da Silva Aragão, Vanessa Santana Silva, Rafael Rabelo de Carvalho, Robert S. Matos, Nilson S. Ferreira, Dulce Maria de Araújo Melo, Rosane Maria Pessoa Betânio Oliveira
Publikováno v:
Journal of Materials Research and Technology, Vol 15, Iss , Pp 2711-2724 (2021)
Alumina–titania (Al2O3/TiO2) composites are well-known for their physical and microstructural properties, which allow several engineering applications. However, these properties change when different sintering temperatures are used, due to the exis
Externí odkaz:
https://doaj.org/article/ea8dec973eba4409900e4182e5617ec0
Publikováno v:
Cement, Vol 9, Iss , Pp 100036- (2022)
The incorporation of different levels of UOW into Portland clinker raw meals and its effects on the clinker and cement properties were evaluated. Clinkers were produced and characterized by X-ray diffractometry (XRD) and optical microscopy; the cemen
Externí odkaz:
https://doaj.org/article/acc7bcae54b0476e8c7a774f1b6026e5
Autor:
Cledson Santos, John M. Attah-Baah, Romualdo S. Silva Junior, Marcelo A. Mâcedo, Marcos V. S. Rezende, Robert S. Matos, Ştefan Ţălu, Dung Nguyen Trong, Simone P. A. da Paz, Rômulo S. Angélica, Nilson S. Ferreira
Publikováno v:
Nanomaterials, Vol 13, Iss 6, p 980 (2023)
Herein, we carefully investigated the Fe3+ doping effects on the structure and electron distribution of Cr2O3 nanoparticles using X-ray diffraction analysis (XRD), maximum entropy method (MEM), and density functional theory (DFT) calculations. We sho
Externí odkaz:
https://doaj.org/article/6877194eed0e41628ea28ab6d3ceab5d
Autor:
Robert S. Matos, Nilson S. Ferreira, Ştefan Ţălu, Atefeh Ghaderi, Shahram Solaymani, Marcelo A. Pires, Edgar Aparecido Sanches, Henrique D. da Fonseca Filho
Publikováno v:
Symmetry, Vol 14, Iss 12, p 2675 (2022)
We explored the morphological and 3D spatial properties of Cu/Ni thin films obtained by a co-deposition process. The 3D AFM topographic maps analysis indicated that the films displayed different morphologies and rough profiles dictated by their singu
Externí odkaz:
https://doaj.org/article/f0c004c52fd842e99f10af8fcd9a9b8d
Autor:
Diego S. Evaristo, Raí F. Jucá, João M. Soares, Rodolfo B. Silva, Gilberto D. Saraiva, Robert S. Matos, Nilson S. Ferreira, Marco Salerno, Marcelo A. Macêdo
Publikováno v:
Materials, Vol 15, Iss 21, p 7424 (2022)
Iron niobates, pure and substituted with copper (Fe1−xCuxNbO4 with x = 0–0.15), were prepared by the solid-state method and characterized by X-ray diffraction, Raman spectroscopy, and magnetic measurements. The results of the structural character
Externí odkaz:
https://doaj.org/article/d4f3e0cd9139499b85c8d8ba153139c5