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Wettability control between superoleophobic and superoleophilic characteristics on the modified superhydrophobic surfaces treated with fluoroalkyl end-capped vinyltrimethoxysilane oligomeric silica/poly(styrene-co-butadiene) nanocomposites: application to the separation of oil and water

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Abstract

Fluoroalkyl end-capped vinyltrimethoxysilane oligomer [RF-(CH2CHSi(OMe)3) n -RF; RF = CF(CF3)OC3F7; n = 2, 3: RF-(VM) n -RF] can undergo the sol–gel reaction in the presence of poly(styrene-co-butadiene) (SBR) under alkaline or acidic conditions, respectively, to afford the corresponding fluorinated oligomeric silica/SBR nanocomposites [RF-(VM-SiO2) n -RF/SBR]. Wettability control between superoleophobic and superoleophilic characteristics was observed on the modified superhydrophobic glass surfaces treated with these fluorinated nanocomposites. The nanocomposites, which were prepared under alkaline conditions, can provide a superoleophobic/superhydrophobic (superamphiphobic) characteristic on the modified surface; however, a superoleophilic/superhydrophobic characteristic was observed on the modified surface treated with the fluorinated nanocomposites, which were prepared under acidic conditions. Interestingly, the fluorinated nanocomposite particle powders possessing a superoleophilic/superhydrophobic characteristic were applied to the packing material for the column chromatography to separate not only the mixture of oil and water but also the W/O emulsion to isolate the transparent colorless oil. In addition, these particle powders were found to have a good reusability as the packing materials for the separation of the mixture of oil and water.

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Acknowledgments

This work was partially supported by a Grant-in-Aid for Scientific Research 16K05891 from the Ministry of Education, Science, Sports, and Culture, Japan.

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Correspondence to Hideo Sawada.

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The authors declare that they have no conflict of interest.

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Ratcha, A., Takahashi, R., Kongparakul, S. et al. Wettability control between superoleophobic and superoleophilic characteristics on the modified superhydrophobic surfaces treated with fluoroalkyl end-capped vinyltrimethoxysilane oligomeric silica/poly(styrene-co-butadiene) nanocomposites: application to the separation of oil and water. J Coat Technol Res 15, 211–222 (2018). https://doi.org/10.1007/s11998-017-0003-x

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Keywords

  • Fluorinated oligomer
  • SBR
  • Surface modification/wettability control/superoleophilic/superhydrophobic characteristic
  • Superamphiphobicity
  • Separation of oil/water