Reversibly Photoswitchable High‐Aspect Ratio Surfaces

Herein, the fabrication of light-sensitive high-aspect ratio surfaces with switchable topography using melt-electrowriting shape-memory polymers and deposition light-to-heat converting black ink on it by dip coating is reported on. The lamellae exposed to low temperatures are hard cannot be deformed water droplets. temperature reached upon illumination close melting point soft segment polyurethane that leads softening polymer. Due this, possible locally deform recover light-softened surface structures droplets deposited lamellae. state can fixed cooling down resulting in crystallization Thus, reversibility local deformation achieved. Finally, application developed approach materials for smart light-controlled valves demonstrated, which used controlled mixing fluids microfluidic devices.