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Molecular dynamics study of water and ions transport in nano-pore of layered structure: A case study of tobermorite
Hou D.; Li Z.
2014-09-01
Source PublicationMicroporous and Mesoporous Materials
ISSN13871811
Volume195Pages:9-20
AbstractWater and ions transport in the cement hydrate determines the durability of cementitious material. Due to the structural similarity, tobermorite, an important mineral analogue of the main phase of cement hydrate, was used to investigate transport behaviour at the molecular level. In this study, the structural and dynamical properties of the water/ions and the tobermorite interface were studied by the molecular dynamics (MD) simulation method. On the (0 0 1) surface of tobermorite, water molecules diffusing in the channel between the silicate chains demonstrate a number of structural water features: large density, good orientation preference, ordered interfacial organization and low diffusion rate. The dipole vector of type 1 water molecules point upwards due to the attraction from the calcium sheet, while type 2 water molecules turn downwards due to the restrained H-bonds donated from O atoms in the silicate chains. The stable H-bonds connected with O in the silicate chains restrict the mobility of the channel water molecules. The significant reduction of the diffusion coefficient matches well with the experimental results obtained by NMR, QENS and PCFR techniques. With increasing distance from the channel, the structural and dynamical behavior of the water molecules vary and gradually translate into bulk water properties at distances of 10-15 Å from the liquid-solid interface. In the respect of the ions and tobermorite interaction, there is Cl repulsion and Ca adsorption from the surface. In addition, in simulation time longer than 1 ns, Cl can diffuse to the surficial Ca and forms the unstable Ca-Cl cluster, which accelerates the desorption of the surface Ca atoms. © 2014 Elsevier Inc. All rights reserved.
KeywordChloride binding Diffusion coefficient H-bonds Molecular dynamics Tobermorite
DOI10.1016/j.micromeso.2014.04.011
URLView the original
Language英語
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Cited Times [WOS]:45   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
AffiliationHong Kong University of Science and Technology
Recommended Citation
GB/T 7714
Hou D.,Li Z.. Molecular dynamics study of water and ions transport in nano-pore of layered structure: A case study of tobermorite[J]. Microporous and Mesoporous Materials,2014,195:9-20.
APA Hou D.,&Li Z..(2014).Molecular dynamics study of water and ions transport in nano-pore of layered structure: A case study of tobermorite.Microporous and Mesoporous Materials,195,9-20.
MLA Hou D.,et al."Molecular dynamics study of water and ions transport in nano-pore of layered structure: A case study of tobermorite".Microporous and Mesoporous Materials 195(2014):9-20.
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