Fe3O4纳米粒子与离子型改性剂N, N-二癸基-N-甲基-N-三甲氧基硅正丙基氯化铵进行接枝反应, 再采用反离子脂肪醇聚氧乙烯醚磺酸盐的长链阴离子交换Cl-, 在Fe3O4纳米粒子表面得到具有阴、阳离子双电层结构的表面处理层, 制备出了无溶剂Fe3O4纳米流体。分析结果表明, 表面处理层已成功地接枝在Fe3O4纳米粒子表面, 改性的Fe3O4纳米粒子呈单分散, 其损耗剪切模量G''明显大于储能剪切模量G', 并具有明显的流体行为, 室温下存放一年状态稳定, 流动性良好。
Fe3O4 nanoparticles were modified with ionic surfactant (CH3O)3Si(CH2)3N+(CH3)(C10H20)2Cl−, and then the chloridion was replaced by the anion C9H19C6H4(OCH2CH2)20O(CH2)3SO−3 through an ion-exchange process. As a result, an electrical double–layer structure was formed on the surface of Fe3O4 nanoparticles. The results showed that the surface layer has been successfully grafted on Fe3O4 nanoparticles surface and the modified Fe3O4 nanoparticles were well dispersed. The loss shear modulus G'' of Fe3O4 nanofluids was significantly greater than the storage shear modulus G' at room temperature, which confirms the typical fluid-behavior. Great stability and good flowability are well maintained after standing for a year at room temperature.
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