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...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Journal of Central South University 2018-03, Vol.25 (3), p.526-533
Hauptverfasser: Guan, Qing-jun, Sun, Wei, Liu, Run-qing, Yin, Zhi-gang, Zhang, Chen-hu
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
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.
ISSN:2095-2899
2227-5223
DOI:10.1007/s11771-018-3757-0