BR – Page 7 – TechConnect Briefs

MOSFET threshold voltage: definition, extraction, and applications

Machado M.B., Siebel O., Schneider M.C., Galup-Montoro C., Federal University of Santa Catarina, BR

The threshold voltage VT is a fundamental parameter in the characterization of MOS transistors and should be used, whatever is the adopted model for the transistor. The classical definition of threshold: phis = 2phiF +V [...]

Critical exponents from parallel plate geometries with periodic and antiperiodic boundary conditions

Silva Jr. J.B., Leite M.M., UFPE, BR

We present a one-particle irreducible formalism to compute critical exponents for a parallel plate geometries for periodic and antiperiodic boundary conditions, at least at two loop order in perturbation theory.

Boehmite nanometric with high surface area synthesized from a microwaves hydrothermal method

Quirino M.R., Oliveira M.J.C., Keyson D., Gama L., Bosco J., Federal University of Paraíba, BR

As the crystallization kinetics is enhanced by the introduction of the microwave hydrothermal method, the arm of this work was to produce and characterize boehmite by microwave-assisted hydrothermal. Boehmite nanostructure were synthesized by a hydrothermal [...]

A Comparative Study of Nanofluids Exchanging Heat with a Thermal Energy Reservoir

Parise J.A.R., Pontificia Universidade Catolica do Rio de Janeiro, BR

A comparative study of nanofluids exchanging heat with a thermal energy reservoir Parise, J.A.R. Pontifícia Universidade Católica do Rio de Janeiro parise@puc-rio.br For their enhanced thermal conductivity and heat transfer characteristics, considerable attention has been [...]

Natural Gas in Syngas Conversion Over Nanosize Catalysts

Neiva L.S., Simões A.N., Oliveira J.B.L., Andrade H.M.C., Gama L., Federal University of Campina Grande, BR

This work has as aim the development of Ni catalysts supported in α-Al2O3/ZnO, Al2O3/Fe2O3 and Al2O3/ZrO2 to be applied in to catalytic reaction of the steam reforming of the methane. The Al2O3/ZnO, Al2O3/Fe2O3 and Al2O3/ZrO2 [...]

Hydrothermal Synthesis and Properties of Hierarchical ZnO and Eu-doped ZnO 3D Structures

Verissimo C., Abbaspourrad A., Sunter K., Capasso F., Moshkalev S., Weitz D., University of Campinas - UNICAMP, BR

Hierarchical oxide nanostructures are very promising materials for different applications, such as gas sensing, due to their high surface area. Literature shows that hierarchical nanostructures improve gas sensing response and response speed. This effect is [...]

Rifampicin nanosuspension production using microfluidic device

Schianti J.N., Cerize N.N.P., Oliveira A.M., Derenzo S., Gongora-Rubio M.R., Polytechnic School - University of São Paulo, BR

In this work the results of a study of Rifampicin nanoprecipitation through antisolvent technique are presented, using microfluidic devices. Rifampicin is commonly used in Tuberculosis treatment and presents variability in bioavailability. The particle size and [...]

Decorated Single- and Multi-Walled Carbon Nanotubes Aiming H2S Sensing

Verissimo C., Ding M., Abbaspourrad A., Star A., Moshkalev S., University of Campinas - UNICAMP, BR

Carbon nanotubes are suitable materials for gas sensing. To promote or improve sensitivity, as well selectivity, experimental procedures have been developed to modify CNTs by the attachment of metal and metal oxide nanoparticles on nanotube [...]

Development of ceramic support for methane reformer from alkali aluminosilicates

Martinello Savi B., Fernandes Silvano W., da Silva L., Bernardin A.M., University of the Extreme South of Santa Catarina, BR

This work deals with the initial development of a ceramic reformer based on alkali metal aluminosilicates coated with nickel for the generation of hydrogen from biogas (methane). The understanding of the microstructural evolution of silicon-aluminum [...]

Development of ceramic support for methane reformer from alkali aluminosilicates

Martinello Savi B., Fernandes Silvano W., da Silva L., Bernardin A.M., University of the Extreme South of Santa Catarina, BR

This work deals with the initial development of a ceramic reformer based on alkali metal aluminosilicates coated with nickel for the generation of hydrogen from biogas (methane). The understanding of the microstructural evolution of silicon-aluminum [...]