RT Journal Article
T1 TEM-HRTEM study on the dehydration process of nanostructured Mg-Ca hydroxide into Mg-Ca oxide
A1 Gómez Villalba, Luz Stella
A1 Sierra Fernández, Aránzazu
A1 Rabanal Jiménez, María Eugenia
A1 Fort, R.
AB The dehydration process from Mg0.97Ca0.03 (OH)(2) nanoparticles (brucite type hexagonal structure) to Mg0.97Ca0.03 (periclase type cubic structure) was studied by Transmission Electron Microscopy (TEM-HRTEM), Electron Diffraction (SAED), Electron Energy Loss Spectroscopy (EELS) and image analysis. The transformation process was monitored in function of the reaction time applying 200 and 300 KV. Changes in porosity were possible to observe only during the irradiation with 200 KV. Depending on the irradiation time, the changes were gradual, producing an increase from the particle's edge towards the inner region. Different stages were observed, corresponding to the amount of water extracted from the particle, until finally a decrease in porosity and particle shrinkage occurs, coinciding with the formation of the Mg-Ca oxide.
PB Elsevier
SN 0272-8842
YR 2016
FD 2016-06
LK https://hdl.handle.net/10016/26949
UL https://hdl.handle.net/10016/26949
LA eng
NO This present research was funded by the Community of Madridunder the GEOMATERIALES 2 project (S2013/MIT-2914), by theComplutense University of Madrid’s Research Group: “The Alterationand Conservation of Stone Heritage” (921349), the AutonomousRegion Program of Madrid, MULTIMAT-CHALLENGE (ref.S2013/MIT‐2862), the Innovation and Education Ministry ref.(MAT2013-47460-C5-5-P) and the Mat201019837/C06-05 projects.
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RD 1 sept. 2024