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San Luis Potosí, Mexico

Lopez-Salinas F.I.,UASLP | Lopez-Salinas F.I.,CIMAV | Martinez-Castanon G.A.,Maestria en Ciencias Odontologicas
Materials Letters | Year: 2010

In the last years, synthesis and characterization of bismuth compounds have received a great attention due to their potential applications. In this work, nanostructured powders of Bi2O3, BiOCl and Bi were prepared by a simple aqueous precipitation method using elemental bismuth as starting material and varying some experimental conditions. The samples obtained were characterized using X-ray diffraction (XRD) and transmission electronic microscopy (TEM); fluorescence, infrared and UV-vis absorption spectroscopies were also used. The obtained powders present a particle size under 100 nm, irregular morphology and agglomeration. A quantum confinement effect can be observed in the optical properties of the samples prepared in this work making them an interesting option for industrial applications. © 2010 Elsevier B.V. All rights reserved. Source


Alfaro Cruz M.R.,Autonomous University of San Luis Potosi | Hernandez-Como N.,National Polytechnic Institute of Mexico | Mejia I.,University of Texas at Dallas | Ortega Zarzosa G.,Autonomous University of San Luis Potosi | And 2 more authors.
Materials Letters | Year: 2014

ZnO thin films with grain morphology were obtained over glass substrates using the sol-gel method; these films were used as substrates to grow ZnO nanorods using chemical bath deposition (CBD) technique. The transmittance percentage of two films was over 85% and the electrical resistivity decreased when ZnO nanorods were grown over the ZnO thin film with grain morphology. A laser is incident at the thin film surface to measure the electrical response as a function of the wavelength change, it is found that electrical response is higher for the thin films with ZnO nanorods; these results shows that ZnO nanorods are a good choice for their use in photosensors. © 2014 Elsevier B.V. Source


Martinez-Castanon G.A.,Maestria en Ciencias Odontologicas | Loyola-Rodriguez J.P.,Maestria en Ciencias Odontologicas | Zavala-Alonso N.V.,Maestria en Ciencias Odontologicas | Hernandez-Martinez S.E.,L.E.S.S. | Ruiz F.,CIMAV
Superficies y Vacio | Year: 2012

In this work, hydroxyapatite nanostructured powders were prepared with different crystallinity degree, crystal size and morphology using a simple aqueous precipitation method varying the pH and temperature parameters. We found that at higher pH values the crystal size grows and crystallinity was improved; at higher temperatures there is also a crystal size growth and crystallinity improving but this change is more significant, a change in the morphology of the nanopowders was also observed. Using XRD patterns and Rietveld analysis we found that the crystal size change from 9.15 to 26.4 nm. The prepared powders are highly agglomerated with a pseudo-spherical and rod-like morphology. © Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales. Source

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