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• W2232983527 endingPage "1557" @default.
• W2232983527 startingPage "1552" @default.
• W2232983527 abstract "Abstract Calcium sulfate hemihydrate (CaSO 4 ·0.5H 2 O, CSH) whiskers with high aspect ratio are promising reinforce materials which have drawn much attention. In order to obtain high quality CSH materials, effect of Mg 2+ ions on properties of the (0 0 2), (2 0 0) 1 and (2 0 0) 2 planes of CSH is investigated using an ab initio density functional theory (DFT) with a van der Waals (vdW) dispersion-correction. The computed results show that strong adsorption and substitution effects take place between Mg 2+ ion and (2 0 0) 1 plane. The adsorption energies of an Mg 2+ ion on the (0 0 2), (2 0 0) 1 and (2 0 0) 2 planes are −0.066, −0.571 and −0.047 eV, respectively. An insight into the electrostatic potential of pristine CSH planes has demonstrated that the (2 0 0) 1 plane is much more negatively charged than the (0 0 2) and (2 0 0) 2 planes. The energies of the substitution of a Ca atom with an Mg atom on the CSH (0 0 2), (2 0 0) 1 and (2 0 0) 2 planes are 1.572, 0.063 and 1.349 eV, respectively. It is found that Ca atoms on the (2 0 0) 1 plane are relatively easy to be substituted by Mg atoms. The calculation results of a Ca 2+ ion adsorption on the Mg-doped (2 0 0) 1 plane indicate that the adsorption energies increase apparently as the doping ratio varies from 0 to 1.0. Compared with K + , Na + and Al 3+ ions, Mg 2+ ion is the most promising additive to promote the growth of CSH along c axis." @default.
• W2232983527 created "2016-06-24" @default.
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• W2232983527 date "2015-12-01" @default.
• W2232983527 modified "2023-10-18" @default.
• W2232983527 title "Adsorption and substitution effects of Mg on the growth of calcium sulfate hemihydrate: An ab initio DFT study" @default.
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• W2232983527 doi "https://doi.org/10.1016/j.apsusc.2015.09.223" @default.
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