(Fig. S7). Compared with
original KF, a roughen surface with grooves and ridges opens up
the possibility for PFOTES-KF to absorb and remain much more
oil. Nevertheless, no significant changes in FTIR spectra was found
within such a short treatment time (1 s) though an element Si is
detectable by an EDS system (Figs. S8 and S9, Supporting
information).