the different wettability between the WNP fiber aerogeland CA also revealed by FTIR spectra in Fig. 4b. The FTIR spectra ofthe WNP fiber aerogel showed the main absorption peaks of func-tional groups, such as C O, C O, C H, and O H. On the contrary,after pyrolysis, the functional groups of the resultant CA became weak and even disappeared, thereby indicating its hydrophobicity.