Back Cover, Volume 2, Number 1, January 2023

Back Cover: The cover image is based on the Research Article Sustainble dropwise condensation enabled ultraefficient heat pipes by Chang et al. The combination of hydrophobic condenser with sustained DWC and nano-engineered evaporator in grooved heat pipes can sufficiently decrease both the thermal resistance of condensation and evaporation simultaneously. Up to 82.3% reduction of the total thermal resistance has been realized. An ultrahigh keff of ~ 140 kW/(m·K), which is 5.17 times higher than that of traditional groove heat pipes, has been achieved. (DOI: 10.1002/dro2.43)