title: Clustered ribbed-nanoneedle structured copper surfaces with high-efficiency dropwise condensation heat transfer performance.
abstract: We report that the dropwise condensation heat transfer (DCHT) effectiveness of copper surfaces can be dramatically enhanced by in situ grown clustered ribbed-nanoneedles. Combined experiments and theoretical analyses reveal that, due to the microscopically rugged and low-adhesive nature of building blocks, the nanosamples can not only realize high-density nucleation but constrain growing condensates into suspended microdrops via the self-transport and/or self-expansion mode for subsequently self-propelled jumping, powered by coalescence-released excess surface energy. Consequently, our nanosample exhibits over 125% enhancement in DCHT coefficient. This work helps develop advanced heat-transfer materials and devices for efficient thermal management and energy utilization.
authors.affiliation: Advanced Thermal Nanomaterials and Devices Research Group, Nanobionic Division, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, P. R. China.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhu
authors.affiliation: Advanced Thermal Nanomaterials and Devices Research Group, Nanobionic Division, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, P. R. China.
authors.forename: Yuting
authors.initials: Y
authors.lastname: Luo
authors.affiliation: Advanced Thermal Nanomaterials and Devices Research Group, Nanobionic Division, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, P. R. China.
authors.forename: Jian
authors.initials: J
authors.lastname: Tian
authors.affiliation: Advanced Thermal Nanomaterials and Devices Research Group, Nanobionic Division, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, P. R. China.
authors.forename: Juan
authors.initials: J
authors.lastname: Li
authors.affiliation: Advanced Thermal Nanomaterials and Devices Research Group, Nanobionic Division, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, P. R. China.
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Gao
keywords: clustered ribbed-nanoneedles; condensate microdrop self-propelling; enhanced heat transfer; high-density nucleation; superhydrophobic