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Nano-MnFe2O4 particles were synthesized by co-precipitation phase inversion method and low-temperature combustion method respectively, using MnCl2, FeCl3, Mn(NO3)2, Fe(NO3)3, NaOH and C6H8O7. X-ray diffraction (XRD), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), thermogravim-etry-differential thermal analysis (TG-DTA) and differential scanning calorimetry (DSC) were used to characterize the structure, morphology, thermal stability of MnFe2O4 and its catalytic performance to ammonium perchlorate. Results showed that single-phased and uniform spinel MnFe2O4 was obtained. The average particle size was about 30 and 20 nm. The infrared absorption peaks appeared at about 420 and 574 cm-1, and the particles were stable below 524 ℃. Using the two prepared catalysts, the higher thermal decomposition temperature of ammonium perchlorate was decreased by 77.3 and 84.9 ℃ respectively, while the apparent decomposition heat was increased by 482.5 and 574.3 J?g?1. The catalytic mechanism could be explained by the favorable electron transfer space provided by outer d orbit of transition metal ions and the high specific surface absorption effect of MnFe2O4 particles. 相似文献
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均匀沉淀法制备AI/ZnS复合粒子 总被引:4,自引:0,他引:4
介绍了以硫代乙酰胺(TAA)和乙酸锌[Zn(Ac)2]为主要原料,在片状铝粉表面包覆一层ZnS,制备出包覆式复合粒子Al/ZnS,改变母粒子Al粉的加入量及反应温度,确定制备包覆完全致密复合粒子的最佳条件,通过SEM、XRD及粒度测试等分析方法对复合粒子进行表征。 相似文献
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泰拉霉素在合成以及降解过程中产生众多未知的杂质,其具有不好分离和难以分析的特点.采用制备液相色谱法,选择合适的固定相和流动相对泰拉霉素合成过程中的杂质进行洗脱分离,将分离出的未知杂质减压蒸馏、萃取除盐后,有机相经旋转蒸发浓缩即可得到杂质泰拉霉素-D.通过核磁与高分辨质谱确认了产物的结构,为泰拉霉素未知杂质的研究奠定了良好的基础. 相似文献
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