Effect of Mg2+ on Hydrothermal Formation of α-CaSO4•0.5H2O Whiskers with High Aspect Ratios

被引：82
作者：
Hou, Sichao [1 ]
Wang, Jing [1 ]
Wang, Xiaoxue [2 ]
Chen, Haoyuan [1 ]
Xiang, Lan [1 ]
机构：
[1] Tsinghua Univ, Dept Chem Engn, Beijing 100084, Peoples R China
[2] MIT, Dept Chem Engn, Cambridge, MA 02139 USA
来源：
LANGMUIR | 2014年 / 30卷 / 32期
基金：
美国国家科学基金会;
关键词：
CALCIUM-SULFATE HEMIHYDRATE; GYPSUM; MORPHOLOGY; CRYSTALLIZATION; DIHYDRATE;
D O I：
10.1021/la502451f
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The effect of Mg2+ on hydrothermal formation of alpha-CaSO4 center dot 0.5H(2)O whiskers with high aspect ratios was investigated in this paper. alpha-CaSO4 center dot 0.5H(2)O whiskers with a preferential growth along the c axis and an average aspect ratio up to 370 were synthesized using hydrothermal treatment of CaSO4 center dot 2H(2)O precursor in the presence of 1.97 X 10(-3) mol.L-1 MgCl2. The preferential adsorption of Mg2+ on the negative (200), (400), and (020) facets was confirmed by EDS, XPS, and zeta potential measurements. ATR-FTIR analysis revealed the ligand adsorption of Mg2+ on the surface of alpha-CaSO4 center dot 0.5H(2)O. The doping of Mg2+ in alpha-CaSO4 center dot 0.5H(2)O whiskers was confirmed by the XRD analysis. The experimental results indicated that the adsorption and doping of Mg2+ promoted the 1-D growth of alpha-CaSO4 center dot 0.5H(2)O whiskers, leading to the formation of whiskers with high aspect ratios.
引用
收藏
页码：9804 / 9810
页数：7
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