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A superhydrophobic and oleophobic film was fabricated on polytetrafluoroethylene (PTFE) using SiO2 nanoparticles and 1H,1H,2H,2H-perfluorooctyltrichlorosilane (FOTS). The surface of the bare PTFE sheet was first coated with SiO2 nanoparticles by the dip-coating method, and FOTS was subsequently deposited on the SiO2-coated PTFE by either dip-coating or vapor deposition. Both of the FOTS-coated PTFE...
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