Now showing items 209-228 of 414

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      Kinetic analysis of solid-state reactions: Precision of the activation energy calculated by integral methods  [Article]

      Pérez Maqueda, Luis Allan; Sánchez Jiménez, Pedro Enrique; Criado Luque, José Manuel (Wiley, 2005)
      The integral methods are extensively used for the kinetic analysis of solid-state reactions. As the Arrhenius integral function [p(χ)] does not have an exact analytical solution, different approximated equations have been ...
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      Kinetic model for thermal dehydrochlorination of poly(vinyl chloride)  [Article]

      Sánchez Jiménez, Pedro Enrique; Perejón Pazo, Antonio; Criado Luque, José Manuel; Diánez Millán, María Jesús; Pérez Maqueda, Luis Allan (Elsevier, 2010)
      In this paper, a novel method for calculating degradation kinetics is presented. The method has been applied to the thermal dehydrochlorination of two different samples of PVC. It has been observed that this dehydrochlorination ...
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      Kinetic studies in solid state reactions by sample-controlled methods and advanced analysis procedures  [Article]

      Pérez Maqueda, Luis Allan; Criado Luque, José Manuel; Sánchez Jiménez, Pedro Enrique; Perejón Pazo, Antonio (Akadémiai Kiadó (Budapest), 2013)
      A comparative study of both conventional rising temperature and sample-controlled methods, like constant rate thermal analysis (CRTA), is carried out after analyzing a set of solid state reactions using both methods. It ...
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      Kinetics of high-temperature oxidation of (Ti,Ta)(CN)-based cermets  [Article]

      Chicardi Augusto, Ernesto; Córdoba Gallego, José Manuel; Gotor Martínez, Francisco José (Elsevier, 2016)
      The kinetics of the high-temperature oxidation of titanium–tantalum carbonitride-based cermets with different Ti/Ta ratios was studied. Isothermal oxidation tests were conducted under static air for 48 h at temperatures ...
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      Kissinger kinetic analysis of data obtained under different heating schedules  [Article]

      Sánchez Jiménez, Pedro Enrique; Criado Luque, José Manuel; Pérez Maqueda, Luis Allan (Springer Netherlands, 2008)
      The dynamic heating rate method developed by TA Instruments ( Hi-Res ™ ) is a kind of sample controlled thermal analysis in which a linear relati onship between the logarith m of the heating rate and ...
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      LaPO4:Er microspheres with high NIR luminescent quantum yield  [Article]

      García Sevillano, Jorge; Cantelar, Eugenio; Justo Erbez, Ángel J.; Ocaña Jurado, Manuel; Cussó, Fernando (Elsevier, 2013)
      Er-doped LaPO4 microspheres have been synthesized by spray pyrolysis and the near infrared (NIR) properties have been characterized. It has been found that, following an adequate post-annealing treatment, the emission ...
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      Large magnetocaloric effect in fine Gd2O3 nanoparticles embedded in porous silica matrix  [Article]

      Zeleňáková, Adriana; Hrubovcˇak, P.; Kapusta, O.; Zelenák, Vladimir; Franco García, Victorino (AIP Publishing, 2016)
      The magnetocaloric properties of a composite material consisting of isolated GdO nanoparticles with a diameter of 6-8 nm embedded in the pores of a mesoporous silica matrix have been studied. The fascinating nanostructure ...
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      Light generation at the anomalous dispersion high energy range of a nonlinear opal film  [Article]

      Botey, Muriel; Molinos Gómez, Alberto; Dorado, Luis A.; Depine, Ricardo A.; Lozano Barbero, Gabriel Sebastián; Martorell, Jordi; Mihi, Agustín; Maymó, Marc; Míguez García, Hernán Ruy (Optical Society of America, 2009)
      We study experimentally and theoretically light propagation and generation at the high energy range of a close-packed fcc photonic crystal of polystyrene spheres coated with a nonlinear material. We observe an enhancement ...
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      Limitations of model-fitting methods for kinetic analysis: Polystyrene thermal degradation  [Article]

      Sánchez Jiménez, Pedro Enrique; Pérez Maqueda, Luis Allan; Perejón Pazo, Antonio; Criado Luque, José Manuel (Elsevier, 2013)
      In this paper, some clarifications regarding the use of model-fitting methods of kinetic analysis are provided in response to the lack of plot linearity and dispersion in the activation energy values for the thermal ...
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      Liquid-phase sintering of Ti(C,N)-based cermets. the effects of binder nature and content on the solubility and wettability of hard ceramic phases  [Article]

      Córdoba Gallego, José Manuel; Chicardi Augusto, Ernesto; Gotor Martínez, Francisco José (Elsevier, 2013)
      Different commercial TiC-TiN/Co/Ni mixtures were used as raw materials for Ti(C,N) cermets, and the effects of the sintering parameters (binder content, binder nature, sintering time and additives) on the final hard ceramic ...
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      Long-chain polyhydroxyesters from natural occurring aleuritic acid as potential material for food packaging  [Article]

      Heredia, Antonio; Domínguez, Eva; Guzmán Puyol, Susana; Heredia Guerrero, José A.; Benítez Jiménez, José Jesús (Taylor & Francis, 2015)
      Fatty polyhydroxyesters (C≥16) are present in nature as barrier polymers like cutin in some protective tissues of higher plants. The mimicry of these biopolymers is regarded as a strategy to design nontoxic and fully ...
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      Low molecular weight ϵ-caprolactone-pcoumaric acid copolymers as potential biomaterials for skin regeneration applications  [Article]

      Contardi, M.; Alfaro-Pulido, A.; Picone, P.; Guzmán-Puyol, S.; Goldoni, L.; Benítez Jiménez, José Jesús; Heredia, Antonio; Bathel, M. J. (Public Library of Science, 2019-04)
      ϵ-caprolactone-p-coumaric acid copolymers at different mole ratios (ϵ-caprolactone:p-coumaric acid 1:0, 10:1, 8:1, 6:1, 4:1, and 2:1) were synthesized by melt-polycondensation and using 4-dodecylbenzene sulfonic acid as ...
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      Low temperature plasma processing of platinum porphyrins for the development of metal nanostructured layers  [Article]

      Filippin, A. Nicolas; Sánchez Valencia, Juan Ramón; Idígoras, Manuel Jesús; Macías Montero, Manuel Jesús; Alcaire Martín, María; Aparicio Martínez, Javier; López Santos, Carmen; Frutos Rayego, Fabián; Barranco Quero, Ángel; Anta Montalvo, Juan Antonio; Borrás Martos, Ana Isabel; Espinós Manzorro, Juan Pedro (Wiley, 2017)
      This article establishes the bases for a vacuum and plasma supported methodology for the fabrication at mild temperatures of nanostructured platinum in the form of porous layers and nanocolumns using platinum octaethylporphyrin ...
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      Low-Temperature Plasma Processing of Platinum Porphyrins for the Development of Metal Nanostructured Layers  [Article]

      Filippin, A. Nicolas; Sánchez Valencia, Juan Ramón; Idígoras, Jesús; Macías Montero, Manuel Jesús; Alcaire Martín, María; Aparicio Rebollo, Francisco Javier; Espinós Manzorro, Juan Pedro; López Santos, Carmen; Frutos Rayego, Fabián; Barranco Quero, Ángel; Anta, Juan A.; Borrás Martos, Ana Isabel (Wiley-VCH, 2017)
      This article establishes the bases for a vacuum and plasma supported methodology for the fabrication at mild temperatures of nanostructured platinum in the form of porous layers and nanocolumns using platinum octaethylporphyrin ...
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      Luminescent 3-hydroxyflavone nanocomposites with a tuneable refractive index for photonics and UV detection by plasma assisted vacuum deposition  [Article]

      Aparicio Rebollo, Francisco Javier; Alcaire Martín, María; Borrás Martos, Ana Isabel; González, Juan C.; López Arbeloa, Fernando; Blaszczyk-Lezak, Iwona Krystina; Rodríguez González-Elipe, Agustín; Barranco Quero, Ángel (Royal Society of Chemistry, 2014)
      Luminescent organic-thin-films transparent in the visible region have been synthesized by a plasma assisted vacuum deposition method. The films have been developed for their implementation in photonic devices and for UV ...
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      Magnesium hydride for energy storage applications: The kinetics of dehydrogenation under different working conditions  [Article]

      Perejón Pazo, Antonio; Sánchez Jiménez, Pedro Enrique; Criado Luque, José Manuel; Pérez Maqueda, Luis Allan (Elsevier, 2016)
      A new approach to the kinetics of magnesium hydride dehydrogenation is considered. A model able to predict the dehydrogenation under different experimental conditions has been proposed. A new combined kinetic analysis ...
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      Magnetic and microstructural analysis of palladium nanoparticles with different capping systems  [Article]

      Litrán Ramos, Rocío; Sampedro, Blanca; Rojas Ruiz, Teresa Cristina; Multigner, Marta; Sánchez López, Juan Carlos; Crespo, Patricia; López Cartes, Carlos; García García, Miguel Ángel; Hernando, Antonio; Fernández Camacho, Asunción (American Physical Society, 2006)
      Palladium nanoparticles capped with different protective systems in a size range between 1.2 and 2.4 nm have been obtained by varying the preparation chemical method. Magnetization curves for all the samples show hysteresis ...
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      Magnetometry and electron paramagnetic resonance studies of phosphine- and thiol-capped gold nanoparticles  [Article]

      Guerrero, Estefanía; Muñoz Márquez, Miguel Ángel; Fernández Camacho, Asunción; Crespo, P.; Hernando, Antonio; Lucena, R.; Conesa Cegarra, José Carlos (American Institute of Physics, 2010)
      In the last years, the number of studies performed by wholly independent research groups that confirm the permanent magnetism, first observed in our research lab, for thiol-capped Au nanoparticles (NPs) has rapidly increased. ...
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      Magnetron sputtered a-SiOxNy thin films: A closed porous nanostructure with controlled optical and mechanical properties  [Article]

      Fortio Godinho, Vanda Cristina; Rojas Ruiz, Teresa Cristina; Fernández Camacho, Asunción (2012)
      were prepared by magnetron sputtering. Pores size, shape and distribution were evaluated by scanning electron microscopy and transmission electron microscopy. Raman and EELS analysis proved that the pores are filled with ...
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      Materials chemistry approaches to the control of the optical features of perovskite solar cells  [Article]

      Calvo Roggiani, Mauricio (Royal Society of Chemistry, 2017)
      Perovskite solar cells have revolutionized the field of photovoltaics. Apart from their impressive photo-conversion efficiencies, the ease of their fabrication – principally when carried out by solution processing – has ...