Mechanical strain induced wetting transitions between anisotropic and isotropic on polydimethylsiloxane (PDMS) films patterned by optical discs
Abstract(#br)We introduce a simple yet robust method for fabrication of wrinkled polydimethylsiloxane (PDMS) surface exhibiting tunable wettability under applied mechanical strain. Submicrometer-scale periodic grooves were prepared by casting the optical discs such as compact disc (CD) and digital versatile disc (DVD) patterns on PDMS. On wrinkled PDMS, the liquid droplet exhibits an anisotropic wetting resulting in a higher contact angle (CA) in the direction perpendicular to the wrinkle axis.