Control of the water adhesion on hydrophobic micropillars by spray coating technique

摘要: We present an alternative approach for controlling the water adhesion on solid superhydrophobic surfaces by varying their coverage with a spray coating technique. In particular, micro-, submicro-, and nanorough were developed starting from photolithographically tailored SU-8 micropillars that used as substrates spraying first poly(tetrafluoroethylene) submicrometer particles subsequently iron oxide nanoparticles. The sprayed serve to induce surface nanoscale roughness, rendering patterns (apparent contact angle values of more than 150°), also tune between extreme states, turning “non-sticky” “sticky” while preserving superhydrophobicity. influence chemical properties geometrical characteristics functionalized wetting is discussed within frame theory. This simple method can find various applications in fabrication microfluidic devices, smart surfaces, biotechnological antifouling materials.