Biomimetic Submicroarrayed Cross-Linked Liquid Crystal Polymer Films with Different Wettability via Colloidal Lithography.
writer：Yuanyuan Zhan, Jianqiang Zhao, Wendong Liu, Bai Yang, Jia Wei, and Yanlei Yu.
keywords：liquid crystal polymer, wettability, colloidal lithography, submicropillar, submicrocone
source：期刊
specific source：ACS Appl. Mater. Interfaces
Issue time：2015年
Photoresponsive cross-linked liquid crystal
polymer (CLCP) ?lms with di?erent surface topographies,
submicropillar arrays, and submicrocone arrays were fabricated
through colloidal lithography technique by modulating
di?erent types of etching masks. The prepared submicropillar
arrays were uniform with an average pillar diameter of 250 nm
and the cone bottom diameter of the submicrocone arrays was
about 400 nm, which are much smaller than previously
reported CLCP micropillars. More interestingly, these two
species of ?lms with the same chemical structure represented
completely di?erent wetting behavior of water adhesion and
mimicked rose petal and lotus leaf, respectively. Both the submicropillar arrayed ?lm and the submicrocone arrayed ?lm exhibited
superhyrophobicity with a water contact angle (CA) value of 144.0 ± 1.7° and 156.4 ± 1.2°, respectively. Meanwhile, the former
demonstrated a very high sliding angle (SA) greater than 90°, and thus, the water droplet was pinned on the surface as rose petal.
On the contrary, the SA of the submicrocone arrayed CLCP ?lm consisting of micro- and nanostructure was only 3.1 ± 2.0°,
which is as low as that of lotus leaf. Furthermore, the change on the wettability of the ?lms was also investigated under alternating
irradiation of visible light with two di?erent wavelengths, blue light and green light.