Acta Chimica Sinica ›› 2013, Vol. 71 ›› Issue (04): 639-643.DOI: 10.6023/A13010137 Previous Articles     Next Articles



梁伟欣a,b, 王贵元a,b, 王奔a,b, 张亚斌a,b, 郭志光a,b   

  1. a 湖北大学功能材料绿色制备与应用教育部重点实验室 武汉 430062;
    b 中国科学院兰州化学物理研究所固体润滑国家重点实验室 兰州 730000
  • 投稿日期:2013-01-27 发布日期:2013-03-08
  • 通讯作者: 郭志光
  • 基金资助:

    项目受国家自然科学基金(Nos. 31070155, 11172301)、湖北省杰出青年基金(No. 2012FFA002)、中国科学院“百人计划”资助.

Superhydrophobic and Magnetic Fe3O4/Polydopamine Composite Nanoparticle and Its Oil/Water Separation

Liang Weixina,b, Wang Guiyuana,b, Wang Bena,b, Zhang Yabina,b, Guo Zhiguanga,b   

  1. a Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062;
    b State Key Laboratory of Solid Lubrication, Lanzhou Insitute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000
  • Received:2013-01-27 Published:2013-03-08
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Nos. 31070155, 11172301), the Distinguished Young Scientists Project of Hubei Province (No. 2012FFA002) and the Top Hundred Talents Program of Chinese Academy of Sciences.

We report a simple approach to creating bifunctional Fe3O4/polydopamine (Fe3O4/PD) composite nanoparticles (NPs) with both superparamagnetic and superhydrophobic properties. The Fe3O4/PD NPs were prepared by virtue of dopamine self-polymerization under mild conditions. Their morphology, structure and composition of nanocomposites were analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), respectively. The Fe3O4/PD NPs have uniform sizes in a narrow range of 100~300 nm. Magnetic measurement reveals the Fe3O4/PD NPs are superparamagnetic with saturation magnetization of 73.40 emu/g. The as-prepared particles showed superhydrophobicity after being modified by 1H,1H,2H,2H-perfluorodecyltrichlorosilane. The Fe3O4 particles were also modified by fluoroalkylsilane, and surface composed of the particles present a water contact angle (CA) of 117°. This result indicated that plenty of phenolic hydroxyl groups in polydopamine may promote the modification of fluorosilane for the surface of Fe3O4. In this study, the magnetic liquid marble was obtained by coating some superhydrophobic Fe3O4/PD NPs on a water droplet. The CA of a liquid marble (4 μL) on the hydrophilic slide glass is 164°, and the sliding angle is 8°. Meanwhile, the mechanical strength and robustness of the liquid marbles were demonstrated. The liquid marbles are facilely controlled to move on various surfaces, such as flat surfaces, on curved surfaces, in oil phase under an external magnetic field control. These results indicate that the magnetic liquid marbles are effective application for manipulation of liquid transport in microfluidic devices. The Fe3O4/PD NPs composed surface has a water CA more than 150°, while the CA of oil is nearly 0°. Therefore, these particles can be used to oil/water separation and the separated oil can be easily transported in the water with an external magnetic field. Impotrantly, the particles could be simply retrieved on the basis of their superparamagnetic properties. Moreover, the reclaimed Fe3O4/PD NPs after washed and dried can still be superhydrophobicity and can be reused.

Key words: Fe3O4/polydopamine composite nanoparticles, superhydrophobic, magnetic, liquid marble, oil/water separation