tailieunhanh - Báo cáo hóa học: "Controllable Synthesis of Magnesium Oxysulfate Nanowires with Different Morphologies"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Controllable Synthesis of Magnesium Oxysulfate Nanowires with Different Morphologies | Nanoscale Res Lett 2008 3 386-389 DOI s11671-008-9171-z NANO EXPRESS Controllable Synthesis of Magnesium Oxysulfate Nanowires with Different Morphologies X. T. Sun W. T. Shi L. Xiang W. C. Zhu Received 1 September 2008 Accepted 8 September 2008 Published online 24 September 2008 to the authors 2008 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 morphologies 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 nanowires with a length of 20-60 m and a diameter of 60300 nm were prepared in the case of double injection adding MgSO4 7H2O and NH4OH solutions simultaneously into water compared with the 513MOS with a length of 20-30 m and a diameter of m in the case of the single injection adding MgSO4 7H2O solution into NH4OH solution . The presence of minor amount of EDTA in the single injection method led to the formation of 513MOS nanowires with a length of 100-200 m 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 nanowires along b axis. Keywords Magnesium oxysulfate Nanowires Double injection EDTA Supersaturation X. T. Sun W. T. Shi L. Xiang H W. C. Zhu Department of Chemical Engineering Tsinghua University Beijing 10084 China e-mail xianglan@ X. T. Sun e-mail sunxt05@ Introduction One-dimensional 1D nanostructured magnesium salts with different morphologies such as needle 1 rod 2 wire 3 tube 4 and belt 5 have attracted much attention because of their unique properties and potential applications in