Now showing items 124-143 of 416

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      Electro Conductive Alumina Nanocomposites From Different Alumina-Carbides Mixtures  [Article]

      Díaz, Luis A.; Fernández, Adolfo; Okunkova, Anna; Solís, Washington; Peretyagin, Pavel; Gotor Martínez, Francisco José; Torrecillas, Ramón (EDP Sciences, 2016)
      This work presents the results of an electro-discharge machined ceramic composites consisting of a base non-conductive ceramic component such Al2O3, to which is added sufficient amounts of an electro-conductive ceramic ...
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      Electron injection and scaffold effects in perovskite solar cells  [Article]

      Anaya Martín, Miguel; Calvo Roggiani, Mauricio; Míguez García, Hernán Ruy; Yuelong Li; Clasen Hames, Bruno; Fabregat Santiago, Francisco; Mora Seró, Iván; Zhang, Wei; Snaith, Henry J. (Royal Society of Chemistry, 2017-01-21)
      In spite of the impressive efficiencies reported for perovskite solar cells (PSCs), key aspects of their working principles, such as electron injection at the contacts or the suitability of the utilization of a specific ...
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      Electronic state characterization of SiOx thin films prepared by evaporation  [Article]

      Barranco Quero, Ángel; Yubero Valencia, Francisco; Espinós Manzorro, Juan Pedro; Groening, P.; Rodríguez González-Elipe, Agustín (American Institute of Physics, 2005)
      SiOx thin films with different stoichiometries from SiO1.3 to SiO1.8 have been prepared by evaporation of silicon monoxide in vacuum or under well-controlled partial pressures of oxygen (P<10–6 Torr). These thin films have ...
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      Enhanced activity of clays and its crucial role for the activity inethylene polymerization  [Article]

      Camejo-Abreu, C.; Tabernero, Vanessa; Alba Carranza, María Dolores; Cuenca, Tomás; Terrero, Pilar (Elsevier, 2014)
      This paper presents a study of the effects of different treatments on the polymerization activity of mod-ified clays as cocatalysts. To achieve this goal, an intercalating cation was introduced into two smectitesand these ...
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      Enhanced diffusion through porous nanoparticle optical multilayers  [Article]

      López López, María del Carmen; Colodrero, Silvia; Raga, Sonia R.; Lindström, Henrik; Fabregat-Santiago, Francisco; Bisquert, Juan; Míguez García, Hernán Ruy (Royal Society of Chemistry, 2011-11-19)
      Herein we demonstrate improved mass transport through nanoparticle one-dimensional photonic crystals of enhanced porosity. Analysis is made by impedance spectroscopy using iodine and ionic liquid based electrolytes and ...
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      Enhanced general analytical equation for the kinetics of the thermal degradation of poly(lactic acid)/montmorillonite nanocomposites driven by random scission  [Article]

      Carrasco, F.; Pérez Maqueda, Luis Allan; Santana, O. O.; Maspoch, María Luisa (Elsevier, 2014)
      An enhanced general analytical equation has been developed in order to evaluate the kinetic parameters of the thermal degradation of nanocomposites, composed of poly(lactic acid) (PLA) and organo-modified montmorillonite ...
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      Enhanced oxidation resistance of Ti(C,N)-based cermets containing Ta  [Article]

      Chicardi Augusto, Ernesto; Gotor Martínez, Francisco José; Córdoba Gallego, José Manuel (Elsevier, 2014)
      (TixTa1-x)(C0.5N0.5)-Co-based cermets with various Ta contents (x=0, 0.01, 0.05, 0.1 and 0.2) were oxidized at 900°C for 48h in static air. A parabolic rate law, which is indicative of the formation of a protective oxide ...
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      Enhancement of dielectric barrier layer properties by sol-gel and PECVD stacks  [Article]

      López López, Carmen; Menéndez, Mari-Fé; Menéndez, Luis Andrés; Menéndez, Armando; Alba Carranza, María Dolores; Sánchez Cortezón, Emilio; Delgado Sánchez, José M. (Elsevier, 2016)
      Thin-film PV modules grown on flexible, light weight, thermally stable and low cost substrates such as stainless steel foil, are an attractive product for solar market applications. When metal foils are used as substrate, ...
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      Enhancement of visible light-induced surface photo-activity of nanostructured N¿TiO2 thin films modified by ion implantation  [Article]

      Romero Gómez, Pablo; López Santos, Carmen; Borrás Martos, Ana Isabel; Espinós Manzorro, Juan Pedro; Palmero Acebedo, Alberto; Rodríguez González-Elipe, Agustín (Elsevier, 2013)
      This work reports the morphological and chemical modifications induced in TiO2 thin films by bombardment with high energy N+ ions at different temperatures and their different photo-activity responses after implantation ...
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      Environmental Effects on the Photophysics of Organic–Inorganic Halide Perovskites  [Article]

      Galisteo López, Juan Francisco; Anaya Martín, Miguel; Calvo Roggiani, Mauricio; Míguez García, Hernán Ruy (American Chemical Society, 2015-06-18)
      The photophysical properties of films of organic–inorganic lead halide perovskites under different ambient conditions are herein reported. We demonstrate that their luminescent properties are determined by the interplay ...
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      Environmentally responsive nanoparticle-based luminescent optical resonators  [Article]

      Ocaña Jurado, Manuel; Sánchez Sobrado, Olalla; Calvo Roggiani, Mauricio; Núñez Alvarez, Nuria O.; Lozano Barbero, Gabriel Sebastián; Míguez García, Hernán Ruy (Royal Society of Chemistry, 2010)
      In this work, we demonstrate that optical resonators built using all-nanoparticle-based porous building blocks provide a responsive multifunctional matrix, totally different emission spectra being attained from the same ...
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      Estudio in-situ de la transformación térmica de limonita utilizada como pigmento procedente de Perú  [Article]

      Romero Gómez, Pablo; González, J.C.; Bustamante, A.; Ruiz Conde, Antonio; Sánchez Soto, Pedro José (Sociedad Española de Cerámica y Vidrio, 2013)
      Se ha realizado un estudio cinético de la transformación térmica de limonita [FeO(OH).nH2O] mediante análisis térmico gravimétrico (TGA), termodifracción de rayos X (DRX) y espectroscopía μ-Raman. La muestra estudiada fue ...
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      Estudio técnico de la decoración del techo perteneciente a la Sala Capitular del Ayuntamiento de Sevilla  [Article]

      Durán Benito, Adrián; Robador González, María Dolores; Herrera Quintero, Liz; Gimena Cordoba, Pilar; Pérez Rodríguez, José Luis (Consejo Superior de Investigaciones Científicas, 2010)
      El objetivo de este trabajo es el estudio de diferentes aspectos, como el color, la composición química y las fases mineralógicas presentes en los diferentes materiales que forman la ornamentación del techo de la Sala ...
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      Europium-doped NaGd(WO4)2 nanophosphors: synthesis, luminescence and their coating with fluorescein for pH sensing  [Article]

      Laguna, Mariano; Escudero, Alberto; Núñez Alvarez, Nuria O.; Becerro Nieto, Ana Isabel; Ocaña Jurado, Manuel (Royal Society of Chemistry (Great Britain), 2017)
      Uniform Eu-doped NaGd(WO4)2 nanophosphors with a spherical shape have been synthesized for the first time by using a wet chemistry method based on a homogeneous precipitation process at low temperature (120 °C) in ethylene ...
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      Evaluation of rare earth on layered silicates under subcritical conditions: Effect of the framework and interlayer space composition  [Article]

      Chain Villar, Pablo; Cota Reguero, Agustín; Pavón González, Esperanza; Pazos Zarama, Mery Carolina; Alba Carranza, María Dolores (Elsevier, 2013)
      Clay-based minerals are considered to be an important component in backfill barriers due to both their ability to seal and adsorb radioactive waste and to interact chemically with it under subcritical conditions. Herein, ...
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      Evaluation of the integral methods for the kinetic study of thermally stimulated processes in polymer science  [Article]

      Pérez Maqueda, Luis Allan; Sánchez Jiménez, Pedro Enrique; Criado Luque, José Manuel (Elsevier, 2005)
      This paper reports on the accuracy of the integral methods used for the kinetic analysis of degradation and crystallization of polymers. Integral methods are preferred by many authors over the differential ones because ...
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      Evidence of spin disorder at the surface–core interface of oxygen passivated Fe nanoparticles  [Article]

      Bianco, Lucia del; Hernando, A.; Multigner, M.; Prados, Clara; Sánchez López, Juan Carlos; Fernández, A.; Conde Amiano, Clara Francisca; Conde Amiano, Alejandro (AIP Publishing, 1998)
      Hysteresis, thermal dependence of magnetization, and coercivity of oxide coated ultrafine Fe particles prepared by inert gas condensation and oxygen passivation have been studied in the 5–300 K range. The results are ...
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      Evidence of upconversion luminescence contribution to the improved photoactivity of erbium doped TiO 2 systems  [Article]

      Obregón Alfaro, Sergio; Colón Ibáñez, Gerardo (Royal Society of Chemistry (Great Britain), 2012)
      Er 3+-TiO 2 synthesized by a surfactant free hydrothermal method exhibits good photoactivities under sun-like excitation for the degradation of phenol. The presence of Er 3+ does not affect the structural and morphological ...
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      Exalted photocatalytic activity of tetragonal BiVO4 by Er 3+ doping through a luminescence cooperative mechanism  [Article]

      Obregón Alfaro, Sergio; Lee, S.W.; Colón Ibáñez, Gerardo (Royal Society of Chemistry (Great Britain), 2014)
      Er-doped BiVO4 are synthesized by means of a surfactant free microwave assisted hydrothermal method having good photoactivities under sun-like excitation for the degradation of methylene blue. From the structural and ...
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      Experimental and theoretical analysis of the intensity of beams diffracted by three-dimensional photonic crystals  [Article]

      Dorado, Luis A.; Depine, Ricardo A.; Schinca, Daniel; Lozano Barbero, Gabriel Sebastián; Míguez García, Hernán Ruy (American Physical Society, 2008)
      An analysis of the diffracted beams emerging from three-dimensional photonic crystals is herein presented. The wave vectors of nonspecular beams are calculated for a triangular two-dimensional lattice and the change ...