Listar Química Inorgánica, Cristalografía y Mineralografía - (QICM) por título
Mostrando ítems 175-194 de 454
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Illitización hidrotermal de esmectita en el sitema (NH4)O-Al2O3-SiO2-H2O: influencia de la presencia de amonio
(2018-07-09)Durante la diagénesis se producen reacciones que afectan a filosilicatos y a la materia orgánica, ligadas a la generación de hidrocarburos, esto lleva a la fijación de NH4 en las illitas y a la disolución por ácidos ... -
Imidazole-containing Co2+ and Ni2+ etidronates: crystal structures and electrochemical behaviour
(2021)Metal phosphonates-based coordination polymers (CPs) are known to exhibit versatile structural diversity and functionality. Thus, they have been used, among other applications, as electrocatalyst precursors for both, PEMFCs ... -
Impact of the lanthanide size on the polymorphism and electrical properties of Ln5.4MoO11.1 (Ln = Nd, Sm and Gd)
(Elsevier, 2023)Mixed proton-electronic conductors are of great interest for high temperature electrochemical devices, such as hydrogen separation membranes. In this contribution, ceramics with composition Ln5.4MoO11.1 (Ln = Nd, Sm and ... -
Implementing Pair Distribution Function analysis to rationalize the water-splitting activity of Co-phosphonate-derived electrocatalysts.
(2023)Pair Distribution Function analysis (PDF) is a total X-ray scattering technique, including the diffuse scattering and the Bragg diffraction. Thus, PDF can be used to characterize structural domains of amorphous solids to ... -
Importancia de la morfología de estructuras de ceria-titania en la fotodegradación de azul de metileno bajo UV y luz solar simulada
(2022-02-02)La contaminación del agua constituye un problema de alcance mundial hoy día cuyos efectos perjudiciales se manifiestan tanto a corto como a largo plazo. De entre todas las fuentes antropogénicas de polución del agua, se ... -
In situ high pressure powder diffraction study of proton conductors based on metal phosphonates
(2015-06-30)Soft Porous Metal Organic frameworks (MOFs) are referred to as a class of coordination polymers that exhibit structural flexibility in response to guest interactions or physical stimuli [1]. By combining softness and ... -
In situ hydration imaging study of a ye'elimite paste by ptychographic x-ray computed tomography
(2017)Eco-cements are a desirable alternative to ordinary Portland cements because of their lower CO2 footprints. For instance, the manufacture of Calcium SulfoAluminate (CSA) cements is more environmentally friendly than that ... -
In situ synchrotron powder diffraction study of LC3 cement activation at very early ages by C-S-H nucleation seeding.
(Elsevier, 2024-02-22)Limestone Calcined Clay Cements, LC3, are being widely researched as low-carbon binders. However, the hydration reactions during the first day are key for their performances and they were not well known. Here, we employ ... -
In-situ early age hydration of cement-based materials by synchrotron X-ray powder diffraction
(2015-07-01)Cement based binders are building materials of worldwide importance. Since these samples are very complex, the knowledge/control of their mineralogical composition are essential to design and predict materials with ... -
In-situ early-age hydration study of sulfobelite cements by synchrotron powder diffraction
(Karen Scrivener, 2014)Eco-friendly belite calcium sulfoaluminate (BCSA) cement hydration behavior is not yet well understood. Here,we report an in-situ synchrotron X-ray powder diffraction study for the first hours of hydration of BCSA ... -
In-situ hydration studies of C4AF at early ages in the presence of other phases
(2015-06-22)The ferrite phase, C4AF in cement nomenclature, also called brownmillerite, is the major iron-containing phase in Ordinary Portland Cement (OPC) and in iron rich belite calcium sulfoaluminate cements. The term “ferrite” ... -
In-situ hydration study of sulfobelite eco-cements
(2013-09-12) -
In-situ laboratory X-ray diffraction applied to assess cement hydration.
(Elsevier, 2022)In-situ X-ray diffraction (XRD) is a powerful tool to assess the hydration of cementitious materials, providing time-resolved quantitative analysis with reasonable accuracy without disturbing sample. However, the lack ... -
In-situ Molibdenum X-ray powder diffraction study of the early hydration of cementitious systems on a humidity chamber
(2016-07-06)The durability of cement-based construction materials depends on the environmental conditions during their service life. A further factor is the microstructure of the cement bulk, established by formation of cement hydrates. ... -
In-situ synchrotron powder diffraction study: activation of Portland and Belite cements
(2022-05-31)Portland cement (PC), whose main phase is alite (Ca3SiO5, C3S), is one of the most manufactured products in the world. However, cement industry is one of the major contributors for greenhouse gases (GHG) emissions. In the ... -
Influence of Bi1.5Y0.5O3 Active Layer on the Performance of Nanostructured La0.8Sr0.2MnO3 Cathode.
(MDPI, 2020-09-01)The efficiency of solid oxide fuel cell cathodes can be improved by microstructural optimization and using active layers, such as doped bismuth oxides. In this work, Bi1.5Y0.5O3 (BYO) films are prepared by spray-pyrolysis ... -
Influence of curing temperature on belite cement hydration: a comparative study with Portland cement
(Elsevier, 2021-05-24)Belite cements (BCs) could be a more sustainable binder than Portland cements (PCs) but adequate knowledge of the hydration features has still to be built. In particular, the mild curing hydration temperature effects have ... -
Influence of fly ash blending on hydration and physical behavior of Belite-Alite-Ye'elimite cements
(2018-10-19)A cement powder, composed of belite, alite and ye’elimite, was blended with 0, 15 and 30 wt% of fly ash and the resulting lended cements were further characterized. During hydration, the presence of fly ash caused the ... -
Influence of lanthanum doping on the structure and transport properties of CeO2
(2019-06-10)LaxCe1-xO2-x/2 materials are oxide and/or proton conductors depending on the La-content and they are of interest for numerous electrochemical applications at high temperatures, including membranes for hydrogen separation ...