A5020230457- Catalytic Processes in Materials Science
- Nanomaterials for catalytic reactions
- Ionic liquids properties and applications
- Advanced Photocatalysis Techniques
- Gas Sensing Nanomaterials and Sensors
- Mesoporous Materials and Catalysis
- Catalysis and Hydrodesulfurization Studies
- Ga2O3 and related materials
- Carbon dioxide utilization in catalysis
- Enzyme Catalysis and Immobilization
- Phytoplasmas and Hemiptera pathogens
- Education and Digital Technologies
- Copper-based nanomaterials and applications
- Graphene research and applications
- Innovative Microfluidic and Catalytic Techniques Innovation
- CO2 Reduction Techniques and Catalysts
- ZnO doping and properties
- Enzyme Production and Characterization
- Catalysis for Biomass Conversion
- Pigment Synthesis and Properties
- Maritime Transport Emissions and Efficiency
- Aquaculture Nutrition and Growth
- nanoparticles nucleation surface interactions
- Chemistry Education and Research
- Nanocluster Synthesis and Applications
Pontifícia Universidade Católica do Rio Grande do Sul
2016-2023
Institut Català de Nanociència i Nanotecnologia
2019
Instituto de Física La Plata
2016
Universidade Federal do Rio Grande do Sul
2012-2016
Universidade de Caxias do Sul
2012-2016
Faculdade Única
2016
Freestanding tantalum oxide nanotubes (Ta2O5 NTs) were easily fabricated by controlling only the electrolyte temperature during anodization in a sulfuric acid solution. When decreased, adherence of NTs to Ta substrate increased. High temperatures facilitated formation freestanding NTs. Thermal treatment Ta2O5 below 750 °C resulted an amorphous structure. The orthorhombic crystalline phase appeared at higher than °C. effect thermal on structure and morphology showed that retained their...
Copper catalysts are very promising, affordable alternatives for noble metals in CO oxidation; however, the nature of active species remains unclear and differs throughout previous reports. Here, we report preparation 8 nm copper nanoparticles (Cu NPs), with high metallic content, directly deposited onto surface silica nanopowders by magnetron sputtering deposition. The as-prepared Cu/SiO2 contains 85% Cu0 15% Cu2+ was enriched phase H2 soft pretreatment (96% 4% Cu2+) or further oxidized...
Gold nanoparticles (AuNPs) display distinct characteristics as hydrogenation catalysts, with higher selectivity and lower catalytic activity than group 8–10 metals. The ability of AuNPs to chemisorb/activate simple molecules is limited by the low coordination number surface sites. Understanding pathways involved in reactions promoted supported crucial for broadening their potential applications. In this study, we demonstrate that mechanism catalyzed "clean" surfaces may proceed via homolytic...
A simple one-step method based on the sputtering deposition of Ni nanoparticles (NP) has been developed for production magnetic biocatalysts, avoiding complications and drawbacks methods chemical functionalisation or coating NP. This new technique provided high levels recovery, reusability catalytic activity lipase–Ni biocatalyst.
The use of metal/oxide nanoparticles (NPs) as cocatalysts in heterogeneous photocatalysis is an important strategy to improve the photocatalytic activity semiconductors for hydrogen generation. This article reports a modified sputtering deposition method prepare ultrafine NiO NPs dispersed on anodic Ta2O5 nanotubes (NTs). In situ X-ray absorption near-edge spectroscopy (XANES) measurements revealed that after exposing as-prepared Ni air atmosphere mixture 68% and 32% was formed. Pure phase...
Going against tradition: Uniformly distributed Pd nanoparticles on imidazolium-ionic-liquid-modified Al2O3 surfaces are prepared by a top down approach using new sputtering chamber. The hydrogenation of 1,3-cyclohexadiene is used to probe the surface properties these nanoparticles. A chamber that allows constant mixing solid support during an electro-magnetic oscillator was developed for generation metal (top approach) uniformly over supports. By this chamber, small and well-distributed...
The reaction of BMI·Cl or DMI·Cl with TaCl<sub>5</sub>affords imidazolium tantalate ionic liquids BMI·TaCl<sub>6</sub><bold>1</bold>and DMI·TaCl<sub>6</sub><bold>2</bold>, precursors for the synthesis Ta<sub>2</sub>O<sub>5</sub>nanoparticles.
Hybrid organosilicas prepared by sol-gel processes using 1-n-butyl-3-(3-trimethoxysilylpropyl)-imidazolium cations associated with hydrophilic and hydrophobic anions can be easily decorated well dispersed similar size (1.8-2.1 nm) Pd nanoparticles (Pd-NPs) simple sputtering-deposition. Higher concentration at the surface compared to deeper region is obtained in supports smaller pore diameter (containing ILs) than largest ILs). The IL hydrophobicity plays a central role hydrogenation of...
Well-distributed Ru nanoparticles (Ru-NPs) were produced over Al(2)O(3) supports modified with covalently anchored imidazolium ionic liquids (ILs) containing different anions and cation lateral alkyl chain lengths by simple sputtering from a foil. These Ru-NPs active catalysts for the hydrogenation of benzene. Furthermore, depending on nature IL used to modify support (hydrophilic or hydrophobic), catalytic behaviours observed. Turnover numbers (TON) as high 27 000 turnover frequency (TOF)...
A simple method based on sputtering deposition of Pd onto mesoporous SiO2 (SBA-15) was employed to produce supported nanoparticles (NPs) that can be used as hydrogenation catalysts. The use eliminates contaminants and avoids additional drawbacks traditional chemical methods applied prepare heterogeneous metal mechanical resonant stirrer revolve the SBA-15 powder ensure homogeneous distribution NPs over support. pores act templates for drive nanostructure growth. Consequently, obtained have...
H<sub>2</sub> activation proceeds <italic>via</italic> homolytic over AuNPs confined in ionic liquid hybrid supports and display high kinetic isotope effects convex curves the Arrhenius plots, which suggests possible involvement of a tunneling pathway.
O artigo apresenta uma experimentação destinada ao ensino de Física Moderna no Ensino Médio, especificamente o Efeito Fotoelétrico, e visa a instrumentalizar professor ou servir como inspiração para proposição atividades didáticas. A descrita se funda na exposição lâmpada néon às luzes diferentes comprimentos onda emitidas por LEDs variados. Mede-se corrente fotoelétrica entre os eletrodos da néon, verificando-se que esta possui sentido definido; efeito ocorre quando comprimento luz aplicada...
This article reports a new method to cover powder substrates with metallic nanoparticles (NPs) via an electro-magnetic vibrational device adapted magnetron sputtering equipment. In the present work, it is presented deposition of Cu, Au, Ni and Pd over three different substrates, Al <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> O xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> , SBA15 Lipase, each one particular parameters. The size...
A producao de brocossomos, corpos ultramicroscopicos reticulados e produzidos pelos tubos Malpighi das cigarrinhas uma caracteristica unica Cicadellidae. Os brocossomos ovos ocorrem nas femeas localizam-se junto a metade apical asas anteriores, em forma massas convexas. As utilizam os espalhando-os diretamente sobre postura ou cicatriz provocada na folha para inclusao dos ovos. Esse trabalho teve como objetivo avaliar as propriedades fotoprotetoras radiacao infravermelha ultravioleta...
This work describes the assembly of an electrical device for production and detection electromagnetic pulses. Initially, we present a brief historical overview pioneering experiments using pulses performed by Hertz. The materials needed assembling are described then some proposed to show polarization produced. A modification in receiving allows capture signal over great distances. Finally, applications this High School level discussed.