It seems obvious that something which is “hydro” – “phobic” would fear water, but what happens when a thin sheet of Teflon – the most hydrophobic material that chemistry can create – touches a droplet of water?
Even Teflon prefers to cling to the surface of water rather than remain in contact with air unless we make that surface superhydrophobic (see lower image sequence below). v
Spontaneous wrapping of a droplet of water by Teflon is a form of Capillary Origami.
Teflon is Hydrophilic. Comments on Definitions of Hydrophobic, Shear versus Tensile Hydrophobicity, and Wettability Characterization
L. Gao and T.J. McCarthy
Langmuir 24 (17) (2009) 9183-9188
All solids, including teflon, are hydrophilic (to some extent), but some have roughness induced hydrophobic tendencies
Langmuir 25 (13) (2009) 7185-7187
via AVS server
Capillary origami and superhydrophobic membrane surfaces
N.R. Geraldi, F.F. Ouali, R.H. Morris, G. McHale and M.I. Newton
Appl. Phys. Lett. 102 (21) (2013) art. 214104.