posted on 2022-02-03, 19:34authored byDongkai Chu, Weizhen Li, Zihang Liang, Shuoshuo Qu, Peng Yao
Bioinspired slippery surfaces with
excellent abilities, such as
antifouling, anticorrosion, and drag reduction, have gained increasing
attention due to their multifunction in chemistry, biology, and medicine.
However, the present thermally responsive methods used for in situ
paraffin-infused slippery surfaces (PISS) are usually based on a surface
heat source or certain specific photothermal materials, which seriously
hinders their practical applications. Herein, we present a kind of
in situ PISS processed by femtosecond laser on nickel (Ni) foam with
reversible droplet behavior between sliding and pinning controlled
by a point heat source. By alternately loading and unloading the point
heat source, switchable wettability for liquid droplets can be achieved.
The reaction time of this smart surface to the temperature change
is 4.47 ± 1.14 s. The relationship between droplet volumes and
inclined angles on four different surfaces is quantitatively investigated.
Furthermore, the as-prepared PISS display an impressive self-healing
ability. In addition, by flexibly changing the action path of the
point heat source, the droplet can realize the movement of different
curves. This functional surface and in situ control method will be
a promising candidate for manipulating droplet directional sliding
behavior and smart temperature-responsive surfaces.