| 回流水热合成均分散纳米α-Fe2O3单晶粒子 |
| Preparation of Monodispersed Nano α-Fe2O3 Single Crystal Particles by Refluxing Hydrothermal Method |
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| 摘要: 系统地研究了以Fe(NO3)3为原料，回流水热合成均分散α-Fe2O3纳米粒子。实验结果显示:当pH=1时，随着水热时间的增加，由透射电镜测试可知，多孔性纺锤形α-Fe2O3单晶转变成粒径在45 nm左右的均分散菱形单晶;而Fe(NO3)3用氨水中和形成Fe(OH)3凝胶后，随着初始pH值的增加，完全转变成α-Fe2O3所需的时间增加、粒径减小，但产物的结构更为完整。另外通过实验发现，反应体系中存在的电解质对α-Fe2O3晶体的生成有促进作用。同时对初始pH值及电解质对α-Fe2O3生成速率的影响机理进行了分析。 |
| 关键词: α-Fe2O3 单晶 纳米粒子 水热法 |
| 基金项目: |
| Abstract: Preparation of monodispersed nano α-Fe2O3particles by refluxing hydrothermal method using Fe(NO3)3as st-arting materials were systematically studied. The experiment results showed that when pH=1, as the elongation of hydrothermal process, spindle-type α-Fe2O3single crystal with porous structure would convert to monodispersed rhombohedral single crystal which average particle size was about 45 nm from TEM measurement; when Fe(NO3)3 was neutralized by NH3·H2O to form Fe(OH)3gel, as the initial pH values increased , the formation of α-Fe2O3was retarded, particle size decreased, but the structure of product became more perfect. It was also found that electrolytes in reaction systems could promote the formation of α-Fe2O3. In addition, the mechanisms of the effect of initial pH values and electrolytes on α-Fe2O3formation rates were also analyzed. |
| Keywords: hematite single crystal nano-particles hydrothermal method |
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| 吴东辉,章忠秀,徐玲芳,沈玲玲,汪 信.回流水热合成均分散纳米α-Fe2O3单晶粒子[J].无机化学学报,2004,20(1):31-36. |
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