QICM - Contribuciones a congresos científicos
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Advanced 3D nanoimaging of cement paste hydration using synchrotron Xray ptychographic tomography
Shirani, Shiva; Cuesta, Ana; Santacruz-Cruz, María Isabel
; Gómez-de-la-Torre, María de los Ángeles; Diaz, Ana; Trtik, Pavel; Holler, Mirko; García-Aranda, Miguel Ángel[et al.] (2024-06-25)
Hydration of Portland cements (PC) is a complex phenomenon caused by the presence of multiple components with multi-length scale variability. To investigate this complicated process, state-of-theart 3D nanoimaging ... -
Multimodal study of unaltered cement hydrating pastes: combined high-energy laboratory powder diffraction and microtomography.
Fernández-Sánchez, Jaime; Cuesta, Ana; Shirani, Shiva; Koufany, Imane; Gómez-de-la-Torre, María de los Ángeles; Santacruz-Cruz, María Isabel; Salcedo, Inés R.; León-Reina, Laura; García-Aranda, Miguel Ángel[et al.] (2024)
Background: The study of the hydration pathways of Portland cement (PC) and cement blends presents significant challenges due to their multiphase nature and varying fineness. Quantifying the dissolution of initial crystalline ... -
4D nanoimaging of Portland cement hydration.
Shirani, Shiva; Cuesta, Ana; Díaz, Ana; Trtik, Pavel; Holler, Mirko; Rack, Alexander; Lukic, Bratislav; Brun, Emmanuel; García-Aranda, Miguel Ángel[et al.] (2024)
Portland cements are environmentally contentious, accounting for ≈8% of the anthropogenic CO2 emissions. The understanding of the cement hydration reactions (dissolution and precipitation processes) is important to contribute ... -
Técnicas de caracterización avanzadas para el estudio de pastas de cementos.
(2024)Los cementos son materiales multifásicos, así que es necesario la utilización de diferentes técnicas analíticas para comprender las reacciones de hidratación que se producen. La química de hidratación de los cementos es ... -
Uso conjunto de difracción de rayos X de polvo y microtomografía de laboratorio en la hidratación del cemento Portland.
Fernández-Sánchez, Jaime; Cuesta-García, Ana María; Shirani, Shiva; Redondo-Soto, Cinthya; Gómez-de-la-Torre, María de los Ángeles; Santacruz-Cruz, María Isabel; León-Reina, Laura; Salcedo, Inés R.; García-Aranda, Miguel Ángel[et al.] (2024)
Para estudiar la hidratación de los cementos de manera precisa y robusta, estamos desarrollando un enfoque innovador basado en medidas in situ de pastas, evitando así cualquier alteración de las mismas. Utilizamos la ... -
Characterisation of SCMs using the R3 test for low carbon cements.
Koufany, Imane; Redondo-Soto, Cinthya; Cuesta-García, Ana María; Santacruz-Cruz, María Isabel; Rodríguez-Ruiz, María Dolores; García-Aranda, Miguel Ángel; Gómez-de-la-Torre, María de los Ángeles[et al.] (2024)
The cement industry is working to reduce its environmental impact by replacing clinker with supplementary cementitious materials (SCMs), including pozzolanic materials. This study examines three types of pozzolanic materials: ... -
Mejoras en las resistencias mecánicas de cementos con bajo contenido de clínker.
Morales-Cantero, Alejandro; Vallina, Diego; Gómez-de-la-Torre, María de los Ángeles; Cuesta, Ana; Santacruz-Cruz, María Isabel; García-Aranda, Miguel Ángel[et al.] (2024)
Los cementos con arcilla calcinada y piedra caliza, conocidos como LC³ (del inglés, Limestone calcined clay cement) permiten la reducción de las emisiones de CO₂ hasta en un 55%. Las proporciones de las sustituciones ... -
Proton conductivity properties of novel tin(II) phosphonates
Cañamero-Cebrián, Fernando; Cabeza-Díaz, Aurelio; Vílchez-Cózar, Álvaro; Bazaga-García, Montse; Ramírez-Losilla, Enrique; Olivera-Pastor, Pascual; Pérez-Colodrero, Rosario Mercedes[et al.] (2024-01-16)
Metal phosphonates (MPs), a subclass of coordination polymers, may exhibit acidic groups such as P-OH, SO3H, COOH, N+-H, etc. Combining these features with interesting metals make them highly appealing in the field of fuel ... -
Tuning the activity of cobalt 2-hydroxyphosphonoacetates-derived electrocatalyst for water splitting and oxygen reduction: insights into the local order by pair distribution funcion analysis
Vílchez-Cózar, Álvaro; Pérez-Colodrero, Rosario Mercedes; Bazaga-García, Montse; Olivera-Pastor, Pascual; Cabeza-Díaz, Aurelio (2024-01-16)
Electrode materials generally exhibit complex heterostructures wherein both amorphous and crystalline phases may coexist [1]. Advanced techniques, such as Pair Distribution Function (PDF) analysis, may offer valuable ... -
Study of mixed molybdates of lanthanum and praseodymium, La5.4-xPrxMo1-yNbyO12-δ, for H2 separation membranes
Sánchez Caballero, Abraham; Porras-Vázquez, José Manuel; Dos-Santos-Gómez, Lucía; Zamudio-García, Javier; Infantes-Molina, Antonia; Marrero-López, David; Ramírez-Losilla, Enrique[et al.] (2024-01)
This research explores the impact of praseodymium and niobium doping on the La5.4-xPrxMo1-yNbyO12- _series (x= 1.35, 2.7, 4.05, 5.4; y= 0, 0.1) as materials with mixed proton-ionic conductivity suitable for hydrogen ... -
Empleo conjunto de difracción de rayos X de polvo y microtomografía de laboratorio en la hidratación del cemento Portland.
Fernández-Sánchez, Jaime; Cuesta-García, Ana María; Shirani, Shiva; Redondo-Soto, Cinthya; Gómez-de-la-Torre, María de los Ángeles; Santacruz-Cruz, María Isabel; León-Reina, Laura; Salcedo, Inés R.; García-Aranda, Miguel Ángel[et al.] (2023)
Se trataron los aspectos más generales sobre la química del cemento, la ciencia del hormigón, el empleo de nuevos materiales más eco-eficientes en la preparación de nuevos sistemas cementantes, revalorización de residuos ... -
Materiales puzolánicos para bajar las emisiones de CO2: soluciones locales para un problema global.
Gómez-de-la-Torre, María de los Ángeles; Koufany, Imane; Redondo-Soto, Cinthya; Guirado-Rodríguez, Beatriz; Benjumea-Rejano, Eva M.; Gómez-García, Francisco; Cuesta-García, Ana María; Santacruz-Cruz, María Isabel; Rodríguez-Ruiz, María Dolores; García-Aranda, Miguel Ángel[et al.] (2023)
In recent decades, the cement sector has been looking for solutions to reduce the carbon footprint, being one of the most promising strategies, the replacement of clinker with supplementary cementitious materials, SCMs. ... -
X-Ray Computed Tomography.
(2023)En esta ponencia se presenta una breve introducción a la técnica: Tomografía Computerizada de Rayos-X. Además, se presenta el tomógrafo ubicado en la Unidad de Difracción de Rayos-X y Tomografía Computerizada de los Servicios ... -
Electrocatalytic properties of spray-drying-synthesized cobalt or nickel phosphonate-derived materials.
Cabeza-Díaz, Aurelio; Vílchez-Cózar, Álvaro; Pérez-Colodrero, Rosario Mercedes; Bazaga-García, Montse; Cañamero-Cebrián, Fernando; Olivera-Pastor, Pascual[et al.] (2023)
As a class of coordination polymers (CPs), metal phosphonates (MPs) are constructed by coordination bonds connecting metal sites and phosphonate (RPO32−) ligands, where the metal sites are dispersed uniformly at the atomic ... -
The effect of mechanochemistry on the preparation of heterogeneous catalysts: Reduction of furfural to obtain furfuryl alcohol.
Pérez-Merchán, Antonio Manuel; Scala, Marcela; Cecilia-Buenestado, Juan Antonio; García-Sancho, Cristina; Malpartida-García, Irene; Mérida-Robles, Josefa María; Moreno-Tost, Ramón; Dimitratos, Nikolaos; Maireles-Torres, Pedro Jesús[et al.] (2023)
In this context, mechanochemistry is receiving increasing attention for the synthesis of many chemical compounds in the solid state, considered by IUPAC as one of the 10 methodologies to change the world.Mechanochemistry ... -
Applications of N,N-bis(phosphonomethyl)glycine-derived Sn4+ or Co2+ phosphonates as proton conductors or energy-conversion electrocatalysts.
Cañamero-Cebrián, Fernando; Pérez-Colodrero, Rosario Mercedes; Vílchez-Cózar, Álvaro; Bazaga-García, Montse; Ramírez-Losilla, Enrique; Olivera-Pastor, Pascual; Cabeza-Díaz, Aurelio[et al.] (2023)
Metal phosphonates (MPs), a subclass of coordination polymers, may exhibit acidic groups such as POH, SO3H, COOH, N+-H, etc. Combining these features with electrocatalytically active transition metals, make them highly ... -
Implementing Pair Distribution Function analysis to rationalize the water-splitting activity of Co-phosphonate-derived electrocatalysts.
Pérez-Colodrero, Rosario Mercedes; Vílchez-Cózar, Álvaro; Bazaga-García, Montse; Cañamero-Cebrián, Fernando; Olivera-Pastor, Pascual; Cabeza-Díaz, Aurelio[et al.] (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 ... -
Belite calcium sulfoaluminate cement early hydration: citric acid sensitivity.
Koufany, Imane; Santacruz-Cruz, María Isabel; Bescher, Eric P.; García-Aranda, Miguel Ángel; Gómez-de-la-Torre, María de los Ángeles (2023)
Three buckets, corresponding to three selected samples, of the same type of belite calcium sulfoaluminate (BCSA) cements have been studied. These cements show very similar elemental and mineralogical compositions, and ... -
Effect of alkanolamines in kaolinitic calcined clays pozzolanic reactivity.
Koufany, Imane; Santacruz-Cruz, María Isabel; Rodríguez-Ruiz, María Dolores; Bescher, Eric P.; García-Aranda, Miguel Ángel; Gómez-de-la-Torre, María de los Ángeles[et al.] (2023)
Five kaolinitic clays with different amounts of kaolinite, ranging between ~70 wt% and ~30 wt%, have been studied to unravel the possible activation effect of alkanolamines on the aluminate fraction of calcined clays. ... -
Activation of LC3 low-carbon cements by C-S-H seeding.
Morales-Cantero, Alejandro; Gómez-de-la-Torre, María de los Ángeles; Cuesta-García, Ana María; Santacruz-Cruz, María Isabel; Mazanec, Oliver; Dalla-Libera, Alessandro; Dhers, Sebastien; Schwesig, Peter; Borralleras, Pere; García-Aranda, Miguel Ángel[et al.] (2023)
Portland-based Limestone Calcined Clay Cements (LC3) are attracting a lot of the attention from scholars and field applications due to the reduction in CO2 emissions. However, their low mechanical strengths at early ages ...