3D printed hydrogel for soft thermo-responsive smart window

Abstract Smart windows with tunable optical properties that respond to external environments are being developed reduce energy consumption in buildings. In the present study, we introduce a new type of 3D printed hydrogel amazing flexibility and stretchability (as large as 1500%), well performance controlled by surrounding temperatures. The on PDMS substrate shows transparent-opaque transition high solar modulation (Δ T sol ) up 79.332% around its lower critical solution temperature (LCST) while maintaining luminous transmittance ( lum 85.847% at 20 °C. addition, selective above LCST can be achieved patterned hydrogels which precisely fabricated via projection micro-stereolithography based printing technique. Our promises great potential applications for next generation soft smart windows.