Spray cooling, which dissipates heat through droplet evaporation, is an efficient cooling method. Using seawater instead of freshwater in spraying is appealing given the intensifying global water crisis. However, seawater-based cooling suffers from salt accumulation on hot surfaces. To address this, we present a liquid-like polymer brush coating for heating surfaces. This coating with a dynamic nature regulates salt crystallization during saline evaporation, forming columnar structures beneath the crystals that facilitate salt grain detachment under gravity. As a proof-of-concept, we developed polydimethylsiloxane brush grafted aluminum alloy (PBGAA), which showed a stable temperature drop from 67.9 to 55.4 °C over 2 h of continuous spraying, compared to a temperature rise from 67.9 to 75.9 °C on the control surface (AA). Correspondingly, PBGAA exhibited minimal weight gain (0.015 g) versus a significant increase (1.242 g) on AA. This brush-grafting strategy holds great promise for using seawater in industrial cooling applications.
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