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发明授权
CN101752049B 超顺磁γ-Fe2O3/SiO2纳米复合材料及其制备方法 失效 - 权利终止

超顺磁γ-Fe2O3/SiO2纳米复合材料及其制备方法
摘要：
本发明公开了一种超顺磁γ-Fe2O3/SiO2纳米复合材料及其制备方法。其制备方法步骤为将配制好的Fe2O3溶胶缓慢加到SiO2溶胶中并持续搅拌形成Fe2O3/SiO2纳米复合溶胶，将制备好的Fe2O3/SiO2纳米复合溶胶老化一段时间后加入一定比例的表面活性剂CTAB，制成新的Fe2O3/SiO2纳米复合溶胶，然后将此溶胶老化成凝胶，最后将Fe2O3/SiO2纳米复合凝胶进行700℃热处理后制成具有良好超顺磁性、颗粒分布比较均匀、颗粒尺寸平均的γ-Fe2O3/SiO2纳米复合材料。由于制备过程中加入表面活性剂CTAB后，显示出了明显的超顺磁性，颗粒分布比较均匀，颗粒尺寸平均。
摘要（英）：

The invention discloses a superparamagnetic gama-Fe2O3/SiO2 nano-composite material and a preparation method thereof. The preparation method comprises the following steps of: slowly adding prepared Fe2O3 sol to SiO2 sol; continuously stirring to form Fe2O3/SiO2 nano-composite sol; aging the prepared Fe2O3/SiO2 nano-composite sol for a period of time; adding a certain proportion of surface agent CTAB to prepare new Fe2O3/SiO2 nano-composite sol; then, aging the sol into gel; and finally, thermally processing the Fe2O3/SiO2 nano-composite gel at 700 DEG C to prepare a gama-Fe2O3/SiO2 nano-composite material with favorable superparamagnetism, evener particle distribution and even particle size. Because the surface agent CTAB is added in the preparation process, the superparamagnetic gama-Fe2O3/SiO2 nano-composite material presents obvious superparamagnetism, evener particle distribution and even particle size.

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