Abstract
Fluoroalkyl end-capped vinyltrimethoxysilane oligomer [R F-(CH2CHSi(OMe)3) n -R F; R F = CF(CF3)OC3F7, n = 2, 3: R F-(VM) n -R F oligomer] can undergo the sol–gel reaction in the presence of poly(tetrafluoroethylene) fine particles under alkaline conditions to afford the corresponding fluorinated oligomeric silica/poly(tetrafluoroethylene) nanocomposites [R F-(VM-SiO3/2) n -R F/poly(tetrafluoroethylene) nanocomposites]. Interestingly, the modified glass, poly(tetrafluoroethylene) sheet and filter paper surfaces treated with the obtained nanocomposites were found to exhibit a superoleophilic/superhydrophobic characteristic, although the original poly(tetrafluoroethylene) sheet and the modified glass surface treated with the R F-(VM) n -R F oligomeric silica nanoparticles [R F-(VM-SiO3/2) n -R F] can provide the usual oleophobic/hydrophobic and oleophobic/superhydrophobic properties, respectively. The modified filter paper was applied to the separation membrane for the mixture of oil/water. In addition, the fluorinated poly(tetrafluoroethylene) nanocomposite white-colored powders thus obtained were applied to the packing material for the column chromatography to separate the mixture of oil/water and water-in-oil emulsions. We have also studied on the reusability of the present nanocomposite particle powders as the packing material for the separation of not only the mixture of oil/water but also the water-in-oil emulsions, and the colorless oil was quantitatively isolated under similar conditions even after the use of the packing materials five times.
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This work was partially supported by a Grant-in-Aid for Scientific Research (KAKENHI (C) No.16K05891) from the Japan Society for the Promotion of Science (JSPS).
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Suzuki, Ji., Takegahara, Y., Oikawa, Y. et al. Preparation of fluoroalkyl end-capped vinyltrimethoxysilane oligomeric silica/poly(tetrafluoroethylene) nanocomposites possessing a superoleophilic/superhydrophobic characteristic: application to the separation of oil and water. J Sol-Gel Sci Technol 81, 611–622 (2017). https://doi.org/10.1007/s10971-016-4209-7
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DOI: https://doi.org/10.1007/s10971-016-4209-7