material 2-(perfluorooctyl)ethyl
acrylate (FAC8) was provided by Daikin Industries Co.,
Ltd. and was distilled under vacuum before polymerization. The material
2,2′-azobis(isobutyronitrile) (AIBN, Wako) was recrystallized
from methanol. Dopamine hydrochloride (Sigma-Aldrich) and acryloyl
chloride (Wako) were used as received. Triethylamine (Wako) and methanol
(MeOH, Wako) were distilled before use. Hexafluoroisopropanol (HFIP)
and dichloropentafluoropropanes (HCFC-225s, a mixture of 225ca, CF3CF2CHCl2, and 225cb, CCl2FCF2CHClF) were obtained from Wako Pure Chemical Industries
and Asahi Glass Co., respectively. Halloysite nanotubes (HNTs) with
external diameter of 30–70 nm and length of 1–3 μm
were purchased from Sigma-Aldrich.