writer：Yongping Hou,* Yan Xing, Shile Feng, Chunlei Gao, Hu Zhou, and Yongmei Zheng*
keywords：Droplet Transport
source：期刊
specific source：Adv. Mater. Interfaces 2020, 7, 1901183
Issue time：2020年

In low temperature and high humidity environment, the self-propelling of

droplet on normal wettable gradient surface is often out of control. Here,

inspired by surface features of wetted spider silk and cactus, a kind of

multilevel-structure bioinspired fiber (BSF) with multigradients is fabricated

via a novel gas-bubble template-assisted electrodeposition. The multilevel

structures are used to control the state of the condensed droplets and make

multigradients still work in low temperature and high humidity environment,

while the multigradients provide multiple driving forces to overcome resistance. More importantly, one of driving forces, i.e., the coalescence driving

force, can be controlled via the temperature. Therefore, the BSF can not only

realize the desired self-propelling of deposited droplet in low temperature and

high humidity environment similar to wetted spider silk and cactus, but also

present the controllability of movement. The results may assist in the design

of functional surfaces required for cold environment or high humidity, e.g.,

low temperature microreactors, chemical analytics under specific conditions,

and sensors.