无溶剂Fe_3O_4纳米流体的制备及表征  

Preparation and Characterization of Solvent-free Fe_3O_4 Nanofluids

作　　者：檀雨默[1] 郑亚萍[1] 兰岚[1] 

机构地区：[1]西北工业大学理学院应用化学系,西安710072

出　　处：《高等学校化学学报》2012年第1期206-209,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:51073129);航空基金(批准号:2010ZF53060);西北工业大学研究生创业种子基金(批准号:Z2011012)资助

摘　　要：采用共沉淀法合成Fe3O4纳米粒子,将含有硅氧烷基的离子型改性剂二甲基十八烷基[3-(三甲氧基硅基)丙基]氯化铵与Fe3O4纳米粒子进行接枝反应,再用脂肪醇聚氧乙烯醚磺酸盐的长链阴离子交换Cl-,在Fe3O4纳米粒子表面生成具有阴、阳离子双电层结构的表面处理层,得到无溶剂Fe3O4纳米流体.研究结果表明,在Fe3O4纳米粒子表面成功接枝了有机物长链,改性的Fe3O4纳米粒子呈单分散分布,其损耗剪切模量G″明显大于储能剪切模量G',具有明显的流体行为,在室温下即可流动.The surfactant was used to functionalize the nanoparticles to prepare solvent-free nanofluids.To prevent Fe3O4 nanoparticles from agglomerating and improve the dispersion of Fe3O4 nanoparticles,the solvent-free Fe3O4 nanofluids were synthesized through surface modification.Magnetic Fe3O4 nanoparticles were firstly prepared by chemical co-precipitation method.Then graft the quaternary ammonium salt（CH3O）3Si（CH2）3N＋（CH3）2（C18H37）Cl-,which has silanol groups,on Fe3O4 nanoparticles with hydroxyl groups.Finally,the chloridion was replaced with the anion C9H19—C6H4（OCH2CH2）20O（CH2）3SO3 through an ion-exchang process.An organic layer was formed on the surface of Fe3O4 nanoparticles,and made the Fe3O4 nanoparticles from black powder to brown fluid（at room temperature）.The solvent-free Fe3O4 nanofluids were characterized by X-ray diffraction,Fourier transform infrared spectrum,differential scanning calorimetry,thermogravimetric analysis,transmission electron microscopy and rheometer.The Fe3O4 nanoparticles were monodispersed in solvent-free nanofluids,and the content of Fe3O4 nanoparticles in the nanofluids proved to be about 12%.The loss shear modulus G″ was higher than the storage shear modulus G′.

关 键 词：无溶剂纳米流体 表面改性 FE3O4纳米粒子 

分 类 号：O631[理学—高分子化学] O647.2[理学—化学]