Preparation of α-calcium sulfate hemihydrate whiskers with high aspect ratios in presence of a minor amount of CuCl2·2H2O
In order to produce α-calcium sulfate hemihydrate ( α -CaSO 4 ·0.5H 2 O) whiskers with high aspect ratios, a minor amount of CuCl 2 ·2H 2 O was used as the modifying agent in the process of hydrothermal treatment of calcium sulfate dihydrate (CaSO 4 ·2H 2 O) precursor. The presence of 2.60×10 -3 mol...
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Veröffentlicht in: | Journal of Central South University 2018-03, Vol.25 (3), p.526-533 |
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Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | In order to produce α-calcium sulfate hemihydrate (
α
-CaSO
4
·0.5H
2
O) whiskers with high aspect ratios, a minor amount of CuCl
2
·2H
2
O was used as the modifying agent in the process of hydrothermal treatment of calcium sulfate dihydrate (CaSO
4
·2H
2
O) precursor. The presence of 2.60×10
-3
mol/L CuCl
2
·2H
2
O resulted in the increase of the aspect ratios of
α
-CaSO
4
·0.5H
2
O whiskers from 81 to 253. The preferential adsorption of Cu
2+
on the negative {110} and {100} facets of
α
-CaSO
4
·0.5H
2
O crystal structures was confirmed by EDS and XPS. And ATR-FTIR demonstrated the ligand adsorption of Cu
2+
on the surface of
α
-CaSO
4
·0.5H
2
O whiskers. The experimental results reveal that the whiskers with high aspect ratios are attributed to the adsorption of Cu
2+
, which promotes the 1-D growth of
α
-CaSO
4
·0.5H
2
O whiskers along the
c
axis. |
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ISSN: | 2095-2899 2227-5223 |
DOI: | 10.1007/s11771-018-3757-0 |