Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 527, Issue -, Pages 328-338Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.05.013
Keywords
Nanosecond laser; Silanization; Nitinol alloy; Anisotropoc wetting; High adhesive ability; Biomimetic materials
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Funding
- China-EU H2020 FabSurfWAR project [2016YFE0112100, 644971]
- National Key R&D Program of China [2017YFB1104700]
- National Natural Science Foundation of China [51675376, 51675371, 51675367]
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In this paper, micro/nano-scale structures were fabricated on nitinol alloy (NiTi) to realize tunable anisotropic wetting and high adhesive capability. Laser texturing and silanization process are utilized to change the morphological and chemical properties of substrates. It is noted that these treated substrates exhibit the joint characteristics of anisotropic wetting and high adhesive capability. In order to investigate the influences of laser-texturing and silanization processes on NiTi, these surfaces were evaluated using scanning electron microscope (SEM), a white light confocal microscope, X-ray photoelectron spectroscopy (XPS) and goniometer. The relationship between water volume and anisotropic wetting was also established. From the experimental testing, we can obtain the following conclusions: (1) the anisotropic wetting characterized by the difference between the water contact angles (WCAs) in the vertical and parallel directions ranges from 0 degrees to 20.3 degrees, which is far more than the value of natural rice leaves. (2) the water sliding angles (WSAs) kept stable at 180, successfully mimicking the adhesive ability of rose petals. (3) the silanization process could strengthen the hydrophobicity but weaken anisotropic wetting. These bio-inspired NiTi surfaces have a tremendous potential applications such as microfluidic devices, bio-mimetic materials fabrication and lab on chip. (C) 2018 Elsevier Inc. All rights reserved.
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