MX – Page 8 – TechConnect Briefs

Precipitant molar concentration effect on the upconversion emission in BaZrO3:Er,Yb nanocrystalline phosphor

Diaz-Torres L.A., Salas P., Castaño V.M., Oliva J., Angeles-Chavez C., Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, MX

Strong Blue, green, and red upconversion emission of Er3+ in sub-microcrystalline BaZrO3:(Yb3+Er3+) is observed. Powder samples were obtained by a facile hydrothermal process at 100ºC with different water to ethanol solvent ratios. The as synthesized [...]

Hydrothermal synthesis and Photoluminescent characterization of nanocrystalline BaZrO3

Diaz-Torres L.A., Salas P., Castaño V.M., Oliva J., De la Rosa E., Centro de Investigaciones en Optica A C, MX

Uniform well faceted sub-microcrystalline BaZrO3 particles have been obtained by a facile hydrothermal reaction. It is found that both morphology and photoluminescence properties depend on reaction time, complexation surfactant, solvent water to ethanol ratio, as [...]

Characterization of an electrical powering nano-generator based on aluminum doped ZnO thin films

Muñoz Aguirre N., Rivera López J.E., Martínez Pérez L., Tamayo Meza P., Instituto Politecnico Nacional, MX

Conductive Atomic Force Microscopy (c-AFM) [1][2] characterization was made on Aluminum doped ZnO thin films. Furthermore, to the electrical resistance associated to the surface of the film, was in series connected a load resistance as [...]

Effects of Non-radiative energy transfer processes on the visible upconversion in ZrO2:Yb3+/Er3+ nanocrystals

Meza O., Diaz-Torres L.A., Salas P., De la Rosa E., Solis C.D., Centro de Investigaciones en Optica A C, MX

The luminescence dynamics of both near infrared (NIR) and visible (VIS) emission of Yb3+,Er3+ in nanocrystalline ZrO2 is studied. It is found that upconversion emission is dominated by back transfer processes over direct Yb to [...]

Effect of surfactant on TiO2/UV mediated heterogeneous photocatalytic degradation of DDT in contaminated water

Sinha S., Tapia-Orozco N.G., Acosta-Ramírez D.S., Rodríguez-Vázquez R., CINVESTAV, MX

The toxic effects from the use of pesticides are of great concern to the environment. The pesticides containers are not treated according to the Mexican normativity and hence increase the pollutant levels in the environment, [...]

Pt-Ru nanoparticles Supported on MWCNT as PEM fuel cell Electrocatalysts

Valenzuela-Muñiz A.M., Miki-Yoshida M., Botte G.G., Verde Y., Centro de Investigación en Materiales Avanzados S.C., MX

Support plays an important role in catalyst activity. Small particle size in catalysts provides a high contact area between active phase and the reagents, having as consequence a better activity. Multi Wall Carbon Nanotubes (MWCNT) [...]

Adsorption of Pb2+ using platinum and ruthenium on carbon nanotubes

Azpeitia J.A., Zepeda A., Torres L., Verde Y., Instituto Tecnologico de Cancun, MX

Recently, remove Pb2+ ions from drinking water has been focused due to its high toxicity to our health, such as nausea, convulsions, coma, renal failure, cancer and subtle effects on metabolism and intelligence. Different approaches [...]

Finite Element Method and Genetic Algorithm for Analysis MEMS

Ortiz V.H., Chairez I., Biochip Bubbles, MX

This paper presents an analysis of the finite element method (FEM) and genetic algorithms for the analysis of MEMS and BIOMEMS design. The finite element method is the method used for the computational analysis of [...]

Novel Composites of Carbon Nanotubes with a Poly(Phenylene Ethynylene) by Non-Covalent Wrapping for Photovoltaic Devices

Ramos J.C., Cortes P., Moggio I., Arias E., Martínez C., Moreno K.J., Universidad Autonoma de Ciudad Juarez, MX

Conjugated polymers exhibit optoelectronic properties comparable with those of inorganic semiconductors and with some advantage over them. By their side, carbon nanotubes (CNTs) offer a great opportunity for exciton dissociation. For this reason, the combination [...]

Rigid Poly(vinyl chloride) / Halloysite Nanocomposites

Mondragón M., Roblero Y.S., Sánchez M.E., Zendejas B.E., ESIME-IPN Unidad Azcapotzalco, MX

Polyvinyl chloride (PVC)/ halloysite nanotubes (HNT) nanocomposites were prepared by melt blending of PVC with HNT. PVC masterbatch powders were first hand blended with 1, 3, 5 and 8% w/w of HNT and then melt-mixed [...]