Buscar
Mostrando ítems 1-10 de 18990
Precursores de la Calidad
(2012-10-30)
Presentaciones y teorías acerca de los precursores de la Calidad
Synthesis of PbTiO3 by use of polymeric precursors
(1998-09-01)
Lead titanate powders were synthesized through the use of polymeric precursors according to the Pechini Process. The polymeric precursor was calcined at temperatures ranging from 300 to 600°C for 1 or 2 h. X-ray diffraction ...
Influence of the precursor salts in the synthesis of CaSnO3 by the polymeric precursor method
(Springer, 2007-03-01)
CaSnO3 was synthesized by the polymeric precursor method, using different precursor salts as (CH3COO)(2)Ca. H2O, Ca(NO3)(2). 4H(2)O, CaCl2. 2H(2)O and CaCO3, leading to different results. Powder precursor was characterized ...
Influence of the precursor salts in the synthesis of CaSnO3 by the polymeric precursor method
(Springer, 2007-03-01)
CaSnO3 was synthesized by the polymeric precursor method, using different precursor salts as (CH3COO)(2)Ca. H2O, Ca(NO3)(2). 4H(2)O, CaCl2. 2H(2)O and CaCO3, leading to different results. Powder precursor was characterized ...
Preparation of ZnO nanoparticles: Structural study of the molecular precursor
(Kluwer Academic Publ, 2003-01-01)
The structure of zinc acetate derived precursor currently used in the sol-gel synthesis of ZnO nanoparticles is described. The reaction products obtained before and after reflux of ethanolic zinc acetate solution have been ...
Release of Nitrosamines and Nitrosamine Precursors from Scrap Tires | Environmental Science & Technology Letters
(American Chemical Society, 2021)
Materials used during manufacturing of tires can be a source of nitrosamines and/or their precursors. Here, we examined the leaching of nitrosamines and nitrosamine precursors from scrap tires under different test conditions. ...
BaTiO3 obtained through metallic stearate precursors
(Elsevier B.V., 2003-03-01)
Metallic stearates were used as precursors to obtain BaTiO3. Barium and titanium stearate mixtures were homogenized in ball mill containing some amount of ammonium stearate. The mixture of the precursors was evaluated by ...
Obtenção de filmes finos de TiO2 nanoestruturado pelo método dos precursores poliméricos
(Sociedade Brasileira de Química, 2008-01-01)
This work focuses in optimizing setup for obtaining TiO2 thin films by polymeric precursor route due to its advantages on stoichiometric and morphological control. Precursor stoichiometry, synthesis pH, solids concentration ...
BaTiO3 obtained through metallic stearate precursors
(Elsevier B.V., 2003-03-01)
Metallic stearates were used as precursors to obtain BaTiO3. Barium and titanium stearate mixtures were homogenized in ball mill containing some amount of ammonium stearate. The mixture of the precursors was evaluated by ...
Profiles of cognitive precursors to reading acquisition. Contributions to a developmental perspective of adult literacy
(ELSEVIER, 2012)
This article discusses conceptual and empirical elements concerning the development of cognitive processes that function as precursors of reading, and their association with the acquisition of reading skills in an adult ...