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Acta Chimica Sinica >

2013 , Vol. 71 >Issue 04: 639 - 643

DOI: https://doi.org/10.6023/A13010137

Article

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

  • Liang Weixin ,
  • Wang Guiyuan ,
  • Wang Ben ,
  • Zhang Yabin ,
  • Guo Zhiguang
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  • 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 date: 2013-01-27

  Online 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.

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Abstract

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

Cite this article

Liang Weixin , Wang Guiyuan , Wang Ben , Zhang Yabin , Guo Zhiguang . Superhydrophobic and Magnetic Fe3O4/Polydopamine Composite Nanoparticle and Its Oil/Water Separation[J]. Acta Chimica Sinica, 2013 , 71(04) : 639 -643 . DOI: 10.6023/A13010137

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