中文摘要：

以脂肪醇聚氧乙烯醚（AEO-3）、氯化亚砜和N，N，N’，N’-四甲基-1，4-丁二胺为原料，通过两步法合成一种Gemini阳离子季铵盐型表面活性剂（氯化N，N，N’，N＇-四甲基-N，NL双十二烷基聚氧乙烯醚-1，4-丁二铵盐）。通过傅里叶变换红外光谱肌R和核磁共振氢谱H’NMR对其结构进行表征。利用合成的表面活性剂改性Fe3O4纳米粒子，得到室温下具有流动行为的无溶剂Fe4O4纳米流体，通过FTIR表征流体结构，流体所含无机粒子质量分数为13．1％，Fe3O4纳米粒子呈单分散，粒径为15～20nm．

英文摘要：

A gemini cationic quaternary ammonium salt surfactant was synthesized through two-step process with fatty alcohol polyoxyethylene ether （ AEO-3）, thionyl chloride and N, N, N＇, N＇-tetramethyl- 1,4-diaminobutane. Its structure was characterized by FTIR and H1NMR. Fe3O4 nanoparticles were modified by surfactant synthesized in the previous stage, and the product was solvent-free Fe3O4 nanofluid. The structure of nanofluids was characterized by FTIR. TGA results show that the percent of Fe3O4 nanoparticals is 13. lwt%. TEM image shows that the Fe3O4 nanoparticles have good dispersion and particle size is 15-20 nm.