Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-09-04
Physics
Condensed Matter
Soft Condensed Matter
6 pages, 9 figures To appear in Langmuir DOI 10.1021/la801268v (2008)
Scientific paper
10.1021/la801268v
The paper reports on the comparison of the wetting properties of super-hydrophobic silicon nanowires (NWs), using drop impact impalement and electrowetting (EW) experiments. A correlation between the resistance to impalement on both EW and drop impact is shown. From the results, it is evident that when increasing the length and density of NWs: (i) the thresholds for drop impact and EW irreversibility increase (ii) the contact-angle hysteresis after impalement decreases. This suggests that the structure of the NWs network could allow for partial impalement, hence preserving the reversibility, and that EW acts the same way as an external pressure. The most robust of our surfaces show a threshold to impalement higher than 35 kPa, while most of the super-hydrophobic surfaces tested so far have impalement threshold smaller than 10 kPa.
Boukherroub Rabah
Brunet Philippe
Coffinier Yannick
Lapierre Fabian
Thomy V.
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