Figure 4From: Preparation and characterization of superhydrophobic surfaces based on hexamethyldisilazane-modified nanoporous alumina Contact angle of water droplets on various HMDS-modified alumina surfaces. (a) three times (4-h) HMDS modified thin film alumina surface, (b) one time (4-h) HMDS-modified nanoporous alumina surface, (c) three times (4-h) HMDS-modified nanoporous alumina surface, (d) one time (9-h) HMDS-modified nanoporous alumina surface.Back to article page