Fenero Marta, Knez Mato, Saric Iva, Petravic Mladen, Grande Hans, Palenzuela Jesús
CIDETEC, Basque Research and Technology Alliance (BRTA), Po. Miramón 196, 20014 Donostia-San Sebastián, Spain.
CIC nanoGUNE BRTA, Tolosa Hiribidea, 76, 20018 Donostia-San Sebastián, Spain.
Langmuir. 2020 Sep 22;36(37):10916-10922. doi: 10.1021/acs.langmuir.0c01324. Epub 2020 Sep 11.
In this work, omniphobic surfaces are developed by combining chemical etching and surface modification of aluminum. In the first step, hierarchical micro/nanostructuring is carried out by chemical etching. Thereafter, a perfluoropolyether is grafted onto the corrugated aluminum substrate, decreasing its surface free energy and turning the system omniphobic. The morphology and chemical composition of the developed surfaces are characterized. We observed a low affinity toward liquids, regardless of their chemical nature and surface tension. The surface shows superhydrophobic properties with a water contact angle of 160° and simultaneously strong oleophobic properties with a hexadecane contact angle of 141°. Furthermore, these omniphobic surfaces significantly delay the freezing time of water droplets to 5100 s, which is about 20-fold of the freezing time on pristine aluminum (260 s), and they even inhibit ice growth by repelling the incoming droplets prior to ice nucleation.
在这项工作中，通过结合铝的化学蚀刻和表面改性来制备全憎表面。第一步，通过化学蚀刻进行分级微/纳米结构化。此后，将全氟聚醚接枝到波纹状铝基板上，降低其表面自由能并使系统具有全憎性。对所制备表面的形态和化学成分进行了表征。我们观察到，无论液体的化学性质和表面张力如何，该表面对液体的亲和力都很低。该表面具有超疏水特性，水接触角为160°，同时具有强憎油特性，十六烷接触角为141°。此外，这些全憎表面将水滴的冻结时间显著延迟至5100 s，这大约是原始铝表面（260 s）冻结时间的20倍，并且它们甚至通过在冰核形成之前排斥进入的水滴来抑制冰的生长。
