Listar Ciencias Exactas y Naturales por autor "Machado, Giovanna"

Mostrando ítems 1-7 de 7

    • Characterization of nanoparticles through medium-energy ion scattering 

      Sortica, Maurício de Albuquerque; Grande, Pedro Luis; Machado, Giovanna; Miotti, Leonardo (2009) [Artículo de periódico]
      In this work we review the use of the medium-energy ion scattering (MEIS) technique to characterize nanostructures at the surface of a substrate. We discuss here how the determination of shape and size distribution of the ...

    • Growth of TiO2 nanotube arrays with simultaneous Au nanoparticles impregnation: photocatalysts for hydrogen production 

      Feil, Adriano Friedrich; Migowski, Pedro; Scheffer, Francine Ramos; Pierozan, Matheus Daniel; Corsetti, Rodrigo Ruzicki; Rodrigues, Melissa Machado; Pezzi, Rafael Peretti; Machado, Giovanna; Amaral, Livio; Teixeira, Sergio Ribeiro; Weibel, Daniel Eduardo; Dupont, Jairton (2010) [Artículo de periódico]
      Um novo método para a fabricação de nanotubos (NTs) de TiO2 organizados e impregnados com nanopartículas (NPs) de ouro foi desenvolvido, e as propriedades estruturais, morfológicas e ópticas dos NTs obtidos foram investigadas. ...

    • Microstructural orientation of isotactic polypropylene studied by computerized scanning eletron microscopy image analysis 

      Machado, Giovanna; De Luca, Maria Augusta; Samios, Dimitrios (2001) [Artículo de periódico]
      We evaluate the orientation of microstructural elements of isotatic polypropylene (i-PP) before and after deformation using computerized “Quantikov” software analysis of Scanning Electron Microscopy (SEM) images. We observed ...

    • Photocatalytic performance of Ta2O5/BiVO4 heterojunction for hydrogen production and methylene blue photodegradation 

      Gonçalves, Henrique Barbosa; Freitas, Denilson; Souza, Emanuely; Melo Junior, Mauricio A.; González-Moya, Johan Rene; Padrón-Hernández, Eduardo; Khan, Sherdil; Machado, Giovanna (2022) [Artículo de periódico]
      Forming semiconductor heterojunction is promising for improved photocatalytic performance due to synergistic combination of the best properties of each material. The present study reports a simple hydrothermal strategy to ...

    • Removal of Cd+2 from aqueous solutions onto polypyrrole coated reticulated vitreous carbon eletrodes 

      Tramontina, Jucelânia; Machado, Giovanna; Azambuja, Denise Schermann; Piatnicki, Clarisse Maria Sartori; Samios, Dimitrios (2001) [Artículo de periódico]
      The development of simple methods for removal of heavy metals from aqueous samples is a relevant field of research. In this connection, the electrodeposition of the Cd+2 ion, one of the most toxic species for animals and ...

    • Ruthenium dioxide nanoparticles in ionic liquids : synthesis, caracterization and catalytic properties in hydrogenation of olefins and arenes 

      Rossi, Liane Marcia; Dupont, Jairton; Machado, Giovanna; Fichtner, Paulo Fernando Papaleo; Radtke, Claudio; Baumvol, Israel Jacob Rabin; Teixeira, Sergio Ribeiro (2004) [Artículo de periódico]
      A reação de NaBH4 com RuCl3 dissolvido no líquido iônico 1-n-butil-3-metilimidazólio hexafluorfosfato (BMI.PF6) é um método simples e reprodutível para a síntese de nanopartículas de RuO2 estáveis com distribuição estreita ...

    • The influence of aluminum grain size on alumina nanoporous structure 

      Feil, Adriano Friedrich; Costa, Marlla Vallerius da; Amaral, Livio; Teixeira, Sergio Ribeiro; Migowski, Pedro; Dupont, Jairton; Machado, Giovanna; Peripolli, Suzana Bottega (2010) [Artículo de periódico]
      An approach to control the interpore distances and nanopore diameters of 150-nm-thick thin aluminum films is reported here. The Al thin films were grown by sputtering on p-type silicon substrate and anodized with a ...