- My position is a professor and researcher at Center for Applied Science and Advanced Technology, Legaria Unit, of Nat... moreMy position is a professor and researcher at Center for Applied Science and Advanced Technology, Legaria Unit, of National Polytechnic Institute of Mexico. I am the research leader of National Laboratory for Energy Conversion and Storage, which is involved in activities of Materials Research, Development and Innovation oriented to the area of Renewable Energy.edit
XPS appears to be an excellent probe for exploring the coordination chemistry in metal acetates.
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Thermally induced spin crossover in the Fe(3-hydroxypyridine)2[M(CN)4] series with M = Ni, Pd, and Pt is reported. The role of the distortion of the iron atom coordination environment in the possibility of observing the spin crossover is... more
Thermally induced spin crossover in the Fe(3-hydroxypyridine)2[M(CN)4] series with M = Ni, Pd, and Pt is reported. The role of the distortion of the iron atom coordination environment in the possibility of observing the spin crossover is explored.
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Effect of the distortion for the iron atom coordination environment on the possibility of observing the spin-crossover in Fe(2+)-containing 2D nitroprussides.
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1.- Data for Tulancingo City, Mexico. Monthly cloudiness calculation for insulation correction in the spatial process. Include the graphic of monthly results. (Excel) 2.- Data exported by ASrcGis and calculation of Indices. (Excel) 3.-... more
1.- Data for Tulancingo City, Mexico. Monthly cloudiness calculation for insulation correction in the spatial process. Include the graphic of monthly results. (Excel) 2.- Data exported by ASrcGis and calculation of Indices. (Excel) 3.- Statistics (Excel
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La adsorcion de metano es posible a traves de tres tipos de interacciones: 1) fuerzas dispersivas; 2) polarizacion de la nube electronica debido a un centro de carga positiva; y 3) perturbacion de la nube electronica de la molecula debido... more
La adsorcion de metano es posible a traves de tres tipos de interacciones: 1) fuerzas dispersivas; 2) polarizacion de la nube electronica debido a un centro de carga positiva; y 3) perturbacion de la nube electronica de la molecula debido a una interaccion de polarizacion la cual induce un momento cuadrupolar. Este momento cuadrupolar inducido es capaz de interactuar con un gradiente de campo electrico local. En el presente trabajo, son discutidas las contribuciones de las interacciones dispersivas y electrostaticas de las fuerzas de adsorcion a traves de isotermas de metano en analogos del azul de Prusia y los hexacianometalatos de zinc tipo zeolita.
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Research Interests: Materials Engineering, Condensed Matter Physics, Materials Science, Crystallography, Neutron Diffraction, and 10 moreRietveld refinement, X-ray Emission Spectroscopy, Magnetization, Ferromagnetism, X Ray Photoelectron Spectroscopy, Enseñanza - Aprendizaje Ciencias Naturales Y Exactas, Magnetic Measurements, Antiferromagnetism, Ciencias Fisicas, and double perovskite
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Se desarrollo un metodo de analisis cuantitativo por difraccion de rayos X para la determinacion de las fases mayoritarios caracteristicas de piritico-polimetalicos. Se utilizo la tecnica que emplea relaciones de intencidad como estandar... more
Se desarrollo un metodo de analisis cuantitativo por difraccion de rayos X para la determinacion de las fases mayoritarios caracteristicas de piritico-polimetalicos. Se utilizo la tecnica que emplea relaciones de intencidad como estandar esterno. El metodo incluye la determinacion de las fases siguientes: pirita, barita, cuarzo, galena y y esfalerita.
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Los materiales nanoporosos moleculares tienen muchas potenciales aplicaciones, entre ellas para almacenar H2, con el objetivo de usarse en celdas de hidrogeno como fuente de energia alternativa. Se plantea entonces realizar la simulacion... more
Los materiales nanoporosos moleculares tienen muchas potenciales aplicaciones, entre ellas para almacenar H2, con el objetivo de usarse en celdas de hidrogeno como fuente de energia alternativa. Se plantea entonces realizar la simulacion computacional del proceso de adsorcion de H2 en materiales nanoporosos para tener una mejor comprension de este y asi, eventualmente poder disenar materiales nanoporosos con energia de adsorcion y cantidades adsorbidas apropiadas a requerimientos tecnologicos.
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Varias son las razones que estan forzando a encontrar vias para optimizar el aprovechamiento de los portadores energeticos. Es un hecho comprobado y aceptado que el uso creciente e indiscriminado de combustibles fosiles durante el pasado... more
Varias son las razones que estan forzando a encontrar vias para optimizar el aprovechamiento de los portadores energeticos. Es un hecho comprobado y aceptado que el uso creciente e indiscriminado de combustibles fosiles durante el pasado siglo ha sido el principal responsable del calentamiento global por la emision de gases que provocan el efecto invernadero y con ello, los cambios climaticos. Conjuntamente, las reservas mundiales de esos combustibles fosiles comienzan a agotarse. Una opcion para la optimizacion en la oxidacion de los portadores energeticos es encontrar procesos viables y economicos para disponer de un oxidante rico en oxigeno, desarrollar matrices con elevada capacidad de almacenamiento de hidrogeno y metano, entre otros procesos. En este contexto se inserta el presente Proyecto de Tesis.
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New photoanodes for recalcitrant pollutant degradation should harvest photons from a wide region of the solar spectrum and promote a direct water oxidation reaction towards the hydroxyl radical generation. For this purpose, sulfur,... more
New photoanodes for recalcitrant pollutant degradation should harvest photons from a wide region of the solar spectrum and promote a direct water oxidation reaction towards the hydroxyl radical generation. For this purpose, sulfur, nitrogen-codoped titanium dioxide (S,N-TiO2) films were prepared with different sulfur percentages (1.0, 2.5 and 5.0 at.%) on Ti expanded meshes by sol-gel dip-coating followed by thermal treatment at 400 °C. The morphology, composition, oxidation states of dopants, structural features, optical and semiconducting properties of S,N-TiO2 were used for the materials characterization. While sulfur was found as S4+ or S6+ cations related to surface doping, nitrogen appears as N3− anion occupying substitutional positions in TiO2. This caused an improvement in the photoelectrochemical response of TiO2 related to a decrease of up to 0.25 eV in the optical band gap and the alignments of the TiO2 band structure. S,N-TiO2 films exhibit significantly higher photoelec...
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The coordination polymer Zn3Na2[FeII(CN)6]2 has an open porous framework that is stable in acidic and neutral aqueous solutions and appears to be an attractive solid for investigation as a material for sodium ion-based batteries.
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An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely... more
An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
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Research Interests: Materials Engineering, Condensed Matter Physics, Chemistry, Crystallography, Crystal structure, and 12 moreTransition-Metal Oxides, Pore Size, Zinc, Iron, Spectrum, X ray diffraction, Thermal Stability, Electric Field Gradient, Cell communication, Microporous Materials, Quadrupole splitting, and Rietveld method
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Transition metals nitroprussides form a family of porous molecular materials with relative wide diversity of crystalline structures and also of porous network topologies [1]. These features make nitroprussides interesting... more
Transition metals nitroprussides form a family of porous molecular materials with relative wide diversity of crystalline structures and also of porous network topologies [1]. These features make nitroprussides interesting cyanometallatesbased materials where the role of structural and electronic factors on the hydrogen storage can be evaluated [2]. In this study solid solutions of cubic nitroprussides, Ni1ixCox[Fe(CN)5NO] with x = 0, 0.5, 0.7, 1, were prepared, characterized and evaluated to explore the role of the electrostatic interaction for the hydrogen storage in their cavities. In this series the involved outer metals (Ni, Co) are randomly distributed on the surface of the larger cavities, which has a diameter close to 9 A (Figure 1). Ni and Co are ions with different polarizing power and, in consequence, the local electric field and its gradient within the cavity will be modulated by the relative proportion of these metals found at the cavity surface. The results herein reported and discussed illustrate the role of that interaction on the hydrogen storage.
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Mn2+and Cd2+form a family of isostructural hexacyanoferrates(II,III). Their crystal structures, including those of mixed compositions containing K+and Cs+as charge balance cations, were resolved and refined from XRD powder patterns. The... more
Mn2+and Cd2+form a family of isostructural hexacyanoferrates(II,III). Their crystal structures, including those of mixed compositions containing K+and Cs+as charge balance cations, were resolved and refined from XRD powder patterns. The crystal structures of M3[Fe(CN)6]2⋅xH2O and MCs2[Fe(CN)6] (where M=Mn, Cd) were refined in the space group Fm3m. The mixed salts, MK2[Fe(CN)6]⋅2H2O, were found to be orthorhombic (space group Pmn21). The orthorhombic structure results from a local distortion due to monohydrated potassium ions located in interstitial sites. On ionic exchange in an aqueous solution containing Cs+, the orthorhombic distortion disappears and the cubic cell is obtained. Cs+is a large ion, which practically fills the available interstitial voids stabilizing the cubic structure. In solutions of K+and Cs+the single salts, M2[Fe(CN)6]⋅8H2O (monoclinic P21/n) also transform, in this case liberating M2+ions and forming the corresponding mixed salts. An analogous but slow struct...
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The charge density accumulated at the CN 5σ orbital, via π-back bonding interaction, determines the crystal field splitting for the Fe(ii) atom and the temperature where the spin transition is observed.