NANO EXPRESS Controllable Synthesis of Magnesium Oxysulfate Nanowires with Different Morphologies


Abstract One-dimensional magnesium oxysulfate 5Mg(OH)2 MgSO4 3H2O (abbreviated as 513MOS) with high aspect ratio has attracted much attention because of its distinctive properties from those of the conventional bulk materials. 513MOS nanowires with different mor-phologies were formed by varying the mixing ways of MgSO4 7H2O and NH4OH solutions at room temperature followed by hydrothermal treatment of the slurries at 150 C for 12 h with or without EDTA. 513MOS nano-wires with a length of 20–60 lm and a diameter of 60– 300 nm were prepared in the case of double injection (adding MgSO4 7H2O and NH4OH solutions simulta-neously into water), compared with the 513MOS with a length of 20–30 lm and a diameter of 0.3–1.7 lm in the case of the single injection (adding MgSO4 7H2O solu-tion into NH4OH solution). The presence of minor amount of EDTA in the single injection method led to the forma-tion of 513MOS nanowires with a length of 100–200 lm, a diameter of 80–200 nm, and an aspect ratio of up to 1000. The analysis of the experimental results indicated that the hydrothermal solutions with a lower supersaturation were favorable for the preferential growth of 513MOS nano-wires along b axis

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