Author:
Zorba V,Persano L,Pisignano D,Athanassiou A,Stratakis E,Cingolani R,Tzanetakis P,Fotakis C
Abstract
We report on the wettability properties of silicon surfaces, simultaneously structured on the
micrometre-scale and the nanometre-scale by femtosecond (fs) laser irradiation to render
silicon hydrophobic. By varying the laser fluence, it was possible to control the wetting
properties of a silicon surface through a systematic and reproducible variation of the
surface roughness. In particular, the silicon–water contact angle could be increased from
66° to more
than 130°. Such behaviour is described by incomplete liquid penetration within the silicon features,
still leaving partially trapped air inside. We also show how controllable design and
tailoring of the surface microstructures by wettability gradients can drive the
motion of the drop’s centre of mass towards a desired direction (even upwards).
Subject
Electrical and Electronic Engineering,Mechanical Engineering,Mechanics of Materials,General Materials Science,General Chemistry,Bioengineering
Cited by
240 articles.
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