高等学校化学学报

高等学校化学学报 ›› 2012, Vol. 33 ›› Issue (01): 206.doi: 10.3969/j.issn.0251-0790.2012.01.035

• 高分子化学 • 上一篇    下一篇

无溶剂Fe3O4纳米流体的制备及表征

檀雨默, 郑亚萍, 兰岚   

  1. 西北工业大学理学院应用化学系, 西安 710072
  • 收稿日期:2011-01-11 出版日期:2012-01-10 发布日期:2011-12-20
  • 通讯作者: 郑亚萍,女,博士,教授,主要从事纳米复合材料、聚合物结构与性能研究.E-mail:zhengyp@nwpu.edu.cn E-mail:zhengyp@nwpu.edu.cn
  • 基金资助:

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

Preparation and Characterization of Solvent-free Fe3O4 Nanofluids

TAN Yu-Mo, ZHENG Ya-Ping, LAN Lan   

  1. Department of Applied Chemistry, School of Natural and Applied Science, Northwestern Polytechnical University, Xi’an 710072 , China
  • Received:2011-01-11 Online:2012-01-10 Published:2011-12-20

PDF (PC)

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.

关键词: 无溶剂纳米流体, 表面改性, Fe3O4 纳米粒子

Abstract: 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'.

Key words: Solvent-free nanofluid, Surface modification, Fe3O4 nanoparticles

中图分类号: 

TrendMD: