| pH值对微波水热法制备纳米α-Fe_2O_3的控制作用 |
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| 引用本文： | 吴东辉,章忠秀,施磊,汪信.pH值对微波水热法制备纳米α-Fe_2O_3的控制作用[J].精细化工,2003,20(4):212-214. |
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| 作者姓名： | 吴东辉 章忠秀 施磊 汪信 |
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| 作者单位： | 1. 南通工学院,化工系,江苏,南通,226007
2. 南京理工大学,材料化学实验室,江苏,南京,210094 |
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| 摘 要： | 系统地研究了以Fe(NO3)3为原料,反应液的初始pH值对微波水热法制备纳米α Fe2O3粒子形貌的控制作用。实验结果显示:当pH=1时,所得产物为纺锤形具有较大比表面积的多孔结构;当pH=3时,为近球形的多孔结构;当pH=5时,为菱形单晶且无孔、无团聚;当pH=7时,在相同的反应条件下仍为非晶Fe(OH)3,并未转化为α Fe2O3。同时还分析了pH值及反应液中存在的无机小离子对α Fe2O3生成速率的影响。
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| 关 键 词： | 微波照射 αFe2O3 纳米粒子 形貌 |
| 文章编号： | 1003-5214(2003)04-0212-04 |
| 修稿时间： | 2002年12月20 |
Effect of pH Value on Preparation of Nanon α-Fe2O3 by Microwave Hydrothermal Method |
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| Abstract: | Effect of initial pH values on preparation of nanon α Fe2O3 particles using Fe(NO3)3 as starting material by microwave hydrothermal method was systematically studied.Experimental results showed that when pH=1,the product was spindle shaped with high specific surface area and porous structure;when pH=3,the product had spheric shape with porous structure;when pH=5,the product was rhombohedral single crystal,nonporous and nonaggregated;but when pH=7,under the same reaction conditions,the product was amorphous Fe(OH)3 and didn't convert to α Fe2O3.Effects of pH value and small inorganic ions in solution on the formation rate of α Fe2O3 were also studied. |
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| Keywords: | microwave irradiation α-Fe_2O_3 nanoparticles morphology |
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