A hydrogel-based passive cooling Janus material with both high solar reflectance and remarkable self-cleaning capability

Key Points

• The aim is to develop a hydrogel-based material that combines passive cooling with self-cleaning features.
• Created a monolayer hydrogel material
• Incorporated Janus wettability with hydrophobic properties
• Measured solar reflectance and cooling effects
• Achieved a high solar reflectance of 80.06%
• Demonstrated a hydrophobic upper surface angle of 133°
• Enabled effective self-cleaning capabilities