Synthesis of magnesium oxysulfate whiskers in the presence of sodium dodecyl benzene sulfonate by X. T. Sun and L. Xiang

Crystal Research and Technology

Cryst. Res. Technol. 43, 479 (2008) - Abstract -

Synthesis of magnesium oxysulfate whiskers in the presence of sodium dodecyl benzene sulfonate

X. T. Sun and L. Xiang

Department of Chemical Engineering, Tsinghua University, Beijing, 10084, PR China

Keywords	magnesium oxysulfate whiskers, sodium dodecyl benzene sulfonate, hydrothermal formation, adsorption
PACS	61.46.Hk, 63.22.Kn, 81.07.-b, 87.85.Qr
DOI	10.1002/crat.200711113

Uniform magnesium oxysulfate (5Mg(OH)₂^.MgSO₄^.3H₂O) whiskers with a length of 10-15 μm and a diameter of 0.4-1.0 μm were synthesized in the presence of sodium dodecyl benzene sulfonate (Na-SO₃-C₆H₄-C₁₂H₂₅) at 200°C for 1 h, using MgSO₄^.7H₂O and NaOH as the reactants. Mg(OH)₂ precursor with poor crystallization and small crystal size was formed owing to the adsorption of sodium dodecyl benzene sulfonate on the Mg(OH)₂ surface. The quick dissolution of Mg(OH)₂ precursor in the subsequent hydrothermal reaction inhibited the occurrence of the sector-like byproduct and promoted the formation of magnesium oxysulfate whiskers with uniform morphology.

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