José Arana Varela

• Abstract

  In 2010, we began an international cooperation with the Massachusetts Institute of Technology (MIT), with the group of Prof. Tuller, funded by MISTI MIT and FAPESP (proc. Nº 10/51959-8) and we have had both student and faculty exchanges between both Universities. In 2012, we received another cooperation project MIT-FAPESP (proc. Nº 12/51195-3) and again we achieved student and faculty exc…

  Gas sensor response of thin films: impact of p-n junctions, AP.R

• Abstract

  Compliance with ever more stringent emissions regulations requires the development of reliable, sensitive, selective, fast responding, and cost-effective sensors. Nanotechnoiogy, given its ability to offer large increases in effective active area and functional interfaces, promises to overcome many of the limitations of conventional sensor devices. Semiconducting oxides serve as the basis…

  Modeling effects of sensor response of semiconducting oxide with functionalized nanoparticles, AP.R

• Abstract

  Multiferroics materials exhibit simultaneously ferroelectric and ferromagnetic polarizations and a coupling between them. Due to the coupling between ferroelectric and magnetic domains, multiferroics are likely to offer a whole range of new applications and phenomena. Manganites, either BiMnO3 or REMnO3 (RE = rare earth), present very important class among the known multiferroic materials…

  Preparation of oriented ceramics by synthesis in electric and magnetic field starting from nanostructured precursors, AV.EXT

(Only some records are available in English at this moment)

• Abstract

  Among the nanostructured semiconductors, a class that has been much interest in recent years are the metallic sulphides such as ZnS, CdS, Ag2S and CuS, among others. Particularly, their optical, electrical, and magnetic properties strongly depend on the size of the nanoparticles, their shape and size distribution. In addition, these materials have a wide area of technological applications…

  Nanocrystalline metal sulphides obtained by synthesis at the interface of two solvents assisted by microwave, BP.PD

• Abstract

  In this project, we propose to investigate photoluminescence, photocatalytic and bactericidal properties of (Ca1-xZnx)WO4 and (Ca1-xAg2x)WO4 (x = 0, 1, 2, and 3 %). These compounds will are synthesized from aqueous solutions of their salts (Na2WO4.2H2O, CaNO3.4H2O, ZnNO3, and AgNO3) which will be processed in a hydrothermal system assisted by microwave radiation. The crystals will be obta…

  Investigation of photoluminescent, photocatalytic and bactericide properties of (Ca1-xZnx)WO4 and (Ca1-xAg2x)WO4, BP.PD
• Morphological Control of Nanostructured Copper (II) Oxide and Zinc Oxide Applied in Gas Sensors, BP.PD

(Only some records are available in English at this moment)