The electrodeposition of the ternary alloy coating of Zn -Ni- Co using a solution containing zinc chloride ( ZnCl2 ) , cobalt chloride ( CoCl2.6H2O ) and nickel chloride ( NiCl2.6H2O ) . The crystalline phase , surface morphology and hardness of the alloys obtained were characterized by X-ray diffraction (XRD ) , atomic force microscopy (AFM) and microhardness , respectively . The chemical composition of the coating was measured by atomic absorption spectroscopy . The corrosion rate was measured with a potentiostat through the technique of linear polarization resistance . We found that the ternary alloys obtained have better corrosion resistance and higher hardness than the Zn coating . Under the conditions examined , the electrodeposition of ternary coating is the anomalous type . The crystalline phase of the alloy obtained on ordinary steel and copper is Zn11Ni2 phase .

The electrodeposition of the ternary alloy coating of Zn -Ni- Co using a solution containing zinc chloride ( ZnCl2 ) , cobalt chloride ( CoCl2.6H2O ) and nickel chloride ( NiCl2.6H2O ) . The crystalline phase , surface morphology and hardness of the alloys obtained were characterized by X-ray diffraction (XRD ) , atomic force microscopy (AFM) and microhardness , respectively . The chemical composition of the coating was measured by atomic absorption spectroscopy . The corrosion rate was measured with a potentiostat through the technique of linear polarization resistance . We found that the ternary alloys obtained have better corrosion resistance and higher hardness than the Zn coating . Under the conditions examined , the electrodeposition of ternary coating is the anomalous type . The crystalline phase of the alloy obtained on ordinary steel and copper is Zn11Ni2 phase .

Zinc stannate (ZTO) was synthesised hydrothermally at 200 ºC for 16 h. The obtained material was characterized using X-ray diffraction (XRD) and transmission electron microscope (TEM). The main cristallite size was 40 nm calculated from its X-ray diffractogram. The photocatalytic activity of this material was tested by measuring the decomposition of an aqueous solution of methyl orange under UV light illumination. The result shows a degradation of 30% of the dye after 60 min of treatment.

Se sintetizó el estanato de cinc, Zn2SnO4 (ZTO) por el método hidrotérmico empleando una temperatura de 200 ºC durante 16 h. El material obtenido fue caracterizado por difracción de rayos X (DRX) y microscopia electrónica de transmisión (MET). El tamaño de cristalito calculado a partir de su difractograma fue de 40 nm. La actividad fotocatalítica del ZTO fue evaluada estudiando la degradación del colorante anaranjado de metilo en solución acuosa bajo iluminación luz ultravioleta. Los resultados muestran una degradación de aproximadamente 30% luego de 60 min de tratamiento.

Nanoparticles of zinc peroxide were synthesized by sol-gel technique using as precursors aqueous solutions of zinc acetate di-hydrate (Zn(CH3COO)2.2H2O) and hydrogen peroxide (H2O2) at 30%. During the synthesis the sol was exposed to an specific radiation (gamma or ultraviolet). The structure of the ZnO2 nanoparticles was characterized by X-ray diffraction. The sol absorbance vs. the time of irradiation was studied for UV irradiated sols. Thin films of ZnO2-ZnO were made using spray pyrolysis of the irradiated sols. The morphology of these films was studied by atomic force microscopy.

Nanopartículas de peróxido de zinc (ZnO2) fueron sintetizadas mediante la técnica de sol-gel, empleando acetato de zinc di-hidratado (Zn(CH3COO)2.2H2O) y peróxido de hidrógeno (H2O2) al 30% en un medio acuoso. Durante la síntesis, el sol fue expuesto a una determinada radiación (gamma o ultravioleta). Las nanopartículas de ZnO2 obtenidas fueron caracterizadas estructuralmente mediante la técnica de difracción de rayos-X. Se estudió la dependencia de la absorbancia del sol con relación al tiempo de irradiación ultravioleta. Empleando la técnica de rociado pirolítico se depositaron películas delgadas de ZnO2-ZnO utilizando el sol irradiado. La morfología de las películas fue estudiada mediante microscopía de fuerza atómica.

222Rn is formed by the decay of 226Ra , then decays into 218Po and 214Po . Po ions electrostatically produced can be collected using a camera with a polarized high voltage then decays 218Po 214Pb particles emitting at 6.003 keV and thereafter decays 214Po 210Pb emitting particles at 7.687 keV. By measuring the concentration of these alpha particles in the camera can determine the concentration of radon in the air in an indirect way . The prototype has been developed using a measuring chamber 2 L stainless steel of a S3204 -09 PIN diode ( Hamamatsu ) bare body as alpha-particle detector . The camera and diode are polarized with a source of high voltage ( +500 V ) to collect ions and detect Po alpha particles that are then produced in the decay chain . Operations and digital functions are implemented on a PIC18F4550 microcontroller and the device has an internal USB module communication fo...

222Rn is formed by the decay of 226Ra , then decays into 218Po and 214Po . Po ions electrostatically produced can be collected using a camera with a polarized high voltage then decays 218Po 214Pb particles emitting at 6.003 keV and thereafter decays 214Po 210Pb emitting particles at 7.687 keV. By measuring the concentration of these alpha particles in the camera can determine the concentration of radon in the air in an indirect way . The prototype has been developed using a measuring chamber 2 L stainless steel of a S3204 -09 PIN diode ( Hamamatsu ) bare body as alpha-particle detector . The camera and diode are polarized with a source of high voltage ( +500 V ) to collect ions and detect Po alpha particles that are then produced in the decay chain . Operations and digital functions are implemented on a PIC18F4550 microcontroller and the device has an internal USB module communication fo...