RT Journal Article
T1 Effect of chemical environment on the dynamics of water confined in calcium silicate minerals: 												Natural and synthetic tobermorite
A1 Monasterio, Manuel
A1 Gaitero, Juan J.
A1 Manzano, Hegoi
A1 Dolado, Jorge S.
A1 Cerveny, Silvina
AB Confined water in the slit mesopores of the mineral tobermorite provides an excellent model system for analyzing the dynamic properties of water confined in cement-like materials. In this work, we use broadband dielectric spectroscopy (BDS) to analyze the dynamic of water entrapped in this crystalline material. Two samples, one natural and one synthetic, were analyzed, and despite their similar structure, the motion of confined water in their zeolitic cavity displays considerably different behavior. The water dynamics splits into two different behaviors depending on the chemical nature of the otherwise identical structural environment: water molecules located in areas where the primary building units are SiO4 relax slowly compared to water molecules located in cavities built with both AlO4 and SiO4. Compared to water confined in regular porous systems, water restricted in tobermorite is slower, indicating that the mesopore structure induces high disorder in the water structure. A comparison with water confined in the C-S-H gel is also discussed in this work. The strong dynamical changes in water due to the presence of aluminum might have important implications in the chemical transport of ions within hydrated calcium silicates, a process that governs the leaching and chemical degradation of cement.
SN 0743-7463
YR 2015
FD 2015-05-05
LA eng
NO Monasterio , M , Gaitero , J J , Manzano , H , Dolado , J S & Cerveny , S 2015 , ' Effect of chemical environment on the dynamics of water confined in calcium silicate minerals : Natural and synthetic tobermorite ' , Langmuir , vol. 31 , no. 17 , pp. 4964-4972 . https://doi.org/10.1021/acs.langmuir.5b00614
NO Publisher Copyright: © 2015 American Chemical Society.
DS TECNALIA Publications
RD 1 jul 2024