title: Environmental scanning electron microscopy study of the fine structure of the triple line and cassie-wenzel wetting transition for sessile drops deposited on rough polymer substrates.
abstract: The wetting of rough honeycomb micrometrically scaled polymer substrates was studied. A very strong dependence of the apparent contact angle on the drop volume has been established experimentally. The environmental scanning electron microscopy study of the fine structure of the triple line is reported first. The triple line is not smooth and prefers grasping the polymer matrix over air holes. The precursor rim surrounding the drop has been observed. The revealed dependence of the apparent contact angle on the drop volume is explained by the transition between the pure Cassie and combined Wenzel-Cassie wetting regimes, which is induced by capillarity penetration of water into the holes of relief.
authors: The College of Judea and Samaria, The Research Institute, 44837 Ariel, Israel. Edward@yosh.ac.il
authors: Edward
authors: E
authors: Bormashenko
authors: Yelena
authors: Y
authors: Bormashenko
authors: Tamir
authors: T
authors: Stein
authors: Gene
authors: G
authors: Whyman
authors: Roman
authors: R
authors: Pogreb
authors: Zahava
authors: Z
authors: Barkay