El trabajo que se presenta a continuación se enmarca en el campo de la Ciencia de los Materiales. Tratamos de aportar un poco más de luz al conocimiento de las propiedades y de la estructura de los materiales, desde los puntos de vista experimental y teórico. Por un lado, el estudio de las propiedades se aborda con diversas técnicas de análisis...
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November 27, 2014 (v1)PublicationUploaded on: March 27, 2023
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April 14, 2020 (v1)Publication
Structure simulation algorithms of random packing of spheres and bricks have been developed. These algorithms were used to reproduce the nanostructure of the cementitious calcium silicate hydrates. The textural parameters (specific surface area, porosity, pore size, etc.) of a calcium silicate hydrates (C-S-H) sample, the main binding phase of...
Uploaded on: December 5, 2022 -
January 27, 2023 (v1)Publication
For decades, enormous investigation effort has been devoted to the fabrication of new ceramic matrix composites with enhanced mechanical properties. One of the most explored strategies is the addition of carbon allotropic phases such as carbon nanotubes, graphene, and carbon nanofibers due to their outstanding properties. In this review, the...
Uploaded on: March 1, 2023 -
June 8, 2017 (v1)Publication
The nanostructure of the main binding phase of the hydrated cements, the calcium silicate hydrates (C-S-H), and their structural changes due to aqueous carbonation have been characterized using TEM, nitrogen physisorption, and SAXS. Synthetic C-S-H has been used for this purpose. Two different morphologies were identified, similar to the high...
Uploaded on: December 4, 2022 -
March 30, 2020 (v1)Publication
The nanostructure of supercritically dried calcium silicate hydrates was researched. This particular drying procedure was used to avoid nanostructure modifications due to conventional drying processes. Thus, in this study, the as-precipitated cementitious C-S-H structure was obtained for the first time. A specific surface area 20 % larger than...
Uploaded on: March 27, 2023 -
June 9, 2017 (v1)Publication
Solid colloidal ensembles inherently contain water adsorbed from the ambient moisture. This water, confined in the porous network formed by the building submicron spheres, greatly affects the ensemble properties. Inversely, one can benefit from such influence on collective features to explore the water behavior in such nanoconfinements....
Uploaded on: March 27, 2023 -
March 24, 2020 (v1)Publication
The effect of intergranular water on the conductivity of polycrystalline brucite, Mg(OH)2, was investigated using impedance spectroscopy at 2 GPa, during consecutive heating-cooling cycles in the 298-980 K range. The grain boundary hydration levels tested here span water activities from around unity (wet conditions) down to 10-4 (dry...
Uploaded on: December 4, 2022 -
April 14, 2020 (v1)Publication
Supercritically dried composites have already been analysed and proposed as carbon dioxide sequesters. However, the economical and energetic costs of the supercritical drying process had to be re-evaluated, and were eventually found not to enhance the feasibility of the proposed route for CO2 mineral sequestration. Different composites series...
Uploaded on: December 5, 2022 -
November 24, 2016 (v1)Publication
En este trabajo y con el objetivo de conjugar el punto de vista atomístico y coloidal, presentamos un método com- putacional Monte Carlo que reproduce el empaqueta- miento coloidal de nano-partículas esféricas cristalinas de tipo Tobermorita. Variando los parámetros computa- cionales de empaquetamiento diferentes estructuras tipo Low Density...
Uploaded on: March 27, 2023 -
March 30, 2020 (v1)Publication
The aim of this study was to investigate the adsorption of basic yellow, a cationic dye, from aqueous solution by natural stevensite, with 104m2/g of specific surface area. The kinetics and the effects of several experimental parameters such as the pH of the solution, adsorbent dose and initial dye concentration were researched using a batch...
Uploaded on: December 4, 2022 -
February 13, 2019 (v1)Publication
Processes of carbonation of calcium-rich aqueous industrial wastes from acetylene production were performed mimicking rock weathering, using the atmospheric carbon dioxide as reactant. This residue was carbonated exposing it to the air in artificial pools with controlled solid-to-liquid and surface-to-volume ratios, and the efficiency of this...
Uploaded on: March 27, 2023 -
March 18, 2022 (v1)Publication
In this work, a procedure for fabricating porous alumina with the use of a carbon sacrificial template has been tested in order to optimize the fabrication of porous structures mimicking the porosity and mechanical properties of the human cortical bone. Two different sources of sacrificial carbon were used and compared, and different sintering...
Uploaded on: March 25, 2023 -
November 4, 2022 (v1)Publication
La presente invención se refiere a un uso de una suspensión acuosa que comprende calcio en una proporción mayor al 15% en peso, siendo la fase sólida de la suspensión acuosa preferiblemente portlandita procedente de residuos de la industria química, para
Uploaded on: December 4, 2022 -
April 17, 2018 (v1)Publication
The weathering reactions of hydration and carbonation of nanostructured calcium oxide with atmospheric moisture and carbon dioxide have been characterized. This work is the first-to-date combined kinetic and nanostructural research on CaO oriented to two key processes for different systems, i.e. hardening of construction materials and carbon...
Uploaded on: December 4, 2022 -
November 4, 2022 (v1)Publication
Procedimiento de captura de CO2 y SO2.La presente invención se refiere a un procedimiento de captura de CO2 y SO2 que comprende a) introducir una corriente acuosa de un hidróxido de un metal alcalino o alcalinotérreo y otra gaseosa de CO2 en un depurador-
Uploaded on: March 24, 2023 -
March 30, 2020 (v1)Publication
This work explored several synthesis routes to obtain calcium silicates from different calcium-rich and silica-rich industrial residues. Larnite, wollastonite and calcium silicate chloride were successfully synthesised with moderate heat treatments below standard temperatures. These procedures help to not only conserve natural resources, but...
Uploaded on: December 4, 2022 -
October 27, 2022 (v1)Publication
In this work, the crystal evolution of α-Al2O3 composites reinforced with LBA platelets were monitored by XRD Rietveld. In addition, the mechanical properties of totally densified specimens were researched by Vickers and Knoop indentations. These composite materials were prepared by a sol-gel process from alumina seeded boehmite sol and...
Uploaded on: December 4, 2022 -
November 24, 2016 (v1)Publication
Se han obtenido aerogeles híbridos de sílice orgánico-inorgánico por aplicación de ultrasonidos de alta potencia en los precursores líquidos y posterior secado del gel húmedo en condiciones supercríticas en etanol. Las cadenas orgánicas no se degradan térmicamente y aceleran el proceso de contracción de la red por activación térmica. Los...
Uploaded on: March 27, 2023