反胶束体系中铁氧体纳米粒子的合成及表征
摘要
铁氧体磁性纳米粒子不仅在基本理论上具有特殊的意义，而且在实际应用中有着广泛的用途，因此在过去的十年中，这一领域的研究工作获得广泛重视。
反胶束是一种油包水型胶体分散体系。表面活性剂会在非水溶剂中自发排列形成纳米尺寸的“水池”，这为纳米粒子的制备提供了优良的微反应空间。由于反胶束法制备纳米粒子具有粒径均匀，大小可控等优点，在铁氧体纳米粒子的制备方面具有广阔的发展前景。
本文分别采用通常被认为最佳的阴离子表面活性剂——二(2-乙基己基)丁二酸酯磺酸钠(AOT)，和我们课题组自己设计合成的新型阴离子表面活性剂——二(2-乙基己基)羟基丁二酸酯磺酸钠(AHOT)所构成的反胶束体系为微反应器，成功制备了MnFe_2O_4纳米粒子、CoFe_2O_4纳米粒子和ZnFe_2O_4纳米粒子；还以阳离子型表面活性剂——十六烷基三甲基溴化铵(CTAB)构成的反胶束体系为微反应器，成功制备了ZnFe_2O_4纳米粒子；并探讨了表面活性剂的种类和结构对反胶束法制备铁氧体纳米粒子反应的影响。
结果表明，在铁氧体纳米粒子的合成方面，阴离子型表面活性剂优于阳离子型表面活性剂；对于两种阴离子型表面活性剂，AOT和AHOT在产物形态和制备过程等方面表现出各自的优势。
In the past decade, many investigations have been performed on the magnetic nanoparticles of spinel ferrites. It has not only the great potentials for basic science, but also for the applications in materials.
Reverse micelles are water-in-oil microemlsions. The "water pool" in reverse micelle is formed by surfactant spontaneously arraying in non-aqueous solvent. This provides an excellent micro-reactor for the preparation of nanoparticles. It has many advantages, such as the particles size is well distributed, and its diameter can be well controlled, etc. Because of this virtue, reverse micelle shows broad prospects in the preparation of ferrite nanoparticles.
hi this work, the syntheses of MnFe2O4 nanoparticles, CoFe2O4 nanoparticles and ZnFe2O4 nanoparticles are prepared by the reverse micelle method, these preparations employed reverse micelles formed with anionic surfactant bis-(2-ethylhexyl) sodium sulosuccinate(AOT), which is considered the most effective surfactant, and another anionic surfactant bis-(2-ethylhexyl) sodium hydroxy sulosuccinate(AHOT), which is a new surfactant, and was synthesized by our own research group. We also synthesized ZnFe2O4 nanoparticles using the cationic surfactant cetyltrimethylammonium bromide (CTAB). Finally, we discussed the effect of surfactant on the fabrication of ferrite nanoparticles by reverse micelles.
At last we draw the conclusion that for the synthesis of ferrite nanoparticles, anionic surfactants are superior to cationic surfactants. By discussing the relationship of the two anionic surfactants: AOT and AHOT, we get the point that they expressed advantages in synthesis progress and the final product structure respectively.
反胶束是一种油包水型胶体分散体系。表面活性剂会在非水溶剂中自发排列形成纳米尺寸的“水池”，这为纳米粒子的制备提供了优良的微反应空间。由于反胶束法制备纳米粒子具有粒径均匀，大小可控等优点，在铁氧体纳米粒子的制备方面具有广阔的发展前景。
本文分别采用通常被认为最佳的阴离子表面活性剂——二(2-乙基己基)丁二酸酯磺酸钠(AOT)，和我们课题组自己设计合成的新型阴离子表面活性剂——二(2-乙基己基)羟基丁二酸酯磺酸钠(AHOT)所构成的反胶束体系为微反应器，成功制备了MnFe_2O_4纳米粒子、CoFe_2O_4纳米粒子和ZnFe_2O_4纳米粒子；还以阳离子型表面活性剂——十六烷基三甲基溴化铵(CTAB)构成的反胶束体系为微反应器，成功制备了ZnFe_2O_4纳米粒子；并探讨了表面活性剂的种类和结构对反胶束法制备铁氧体纳米粒子反应的影响。
结果表明，在铁氧体纳米粒子的合成方面，阴离子型表面活性剂优于阳离子型表面活性剂；对于两种阴离子型表面活性剂，AOT和AHOT在产物形态和制备过程等方面表现出各自的优势。
In the past decade, many investigations have been performed on the magnetic nanoparticles of spinel ferrites. It has not only the great potentials for basic science, but also for the applications in materials.
Reverse micelles are water-in-oil microemlsions. The "water pool" in reverse micelle is formed by surfactant spontaneously arraying in non-aqueous solvent. This provides an excellent micro-reactor for the preparation of nanoparticles. It has many advantages, such as the particles size is well distributed, and its diameter can be well controlled, etc. Because of this virtue, reverse micelle shows broad prospects in the preparation of ferrite nanoparticles.
hi this work, the syntheses of MnFe2O4 nanoparticles, CoFe2O4 nanoparticles and ZnFe2O4 nanoparticles are prepared by the reverse micelle method, these preparations employed reverse micelles formed with anionic surfactant bis-(2-ethylhexyl) sodium sulosuccinate(AOT), which is considered the most effective surfactant, and another anionic surfactant bis-(2-ethylhexyl) sodium hydroxy sulosuccinate(AHOT), which is a new surfactant, and was synthesized by our own research group. We also synthesized ZnFe2O4 nanoparticles using the cationic surfactant cetyltrimethylammonium bromide (CTAB). Finally, we discussed the effect of surfactant on the fabrication of ferrite nanoparticles by reverse micelles.
At last we draw the conclusion that for the synthesis of ferrite nanoparticles, anionic surfactants are superior to cationic surfactants. By discussing the relationship of the two anionic surfactants: AOT and AHOT, we get the point that they expressed advantages in synthesis progress and the final product structure respectively.
引文
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