Static and dynamic characterization of robust superhydrophobic surfaces built from nano-flowers on silicon micro-post arrays
dc.contributor.author | Chen, Longquan | |
dc.contributor.author | Xiao, Zhiyong | |
dc.contributor.author | Chan, Philip C H | |
dc.contributor.author | Lee, Yi-Kuen | |
dc.date.accessioned | 2016-02-28T06:08:23Z | |
dc.date.available | 2016-02-28T06:08:23Z | |
dc.date.issued | 2010-09-01 | |
dc.identifier.citation | Chen L, Xiao Z, Chan PCH, Lee Y-K (2010) Static and dynamic characterization of robust superhydrophobic surfaces built from nano-flowers on silicon micro-post arrays. Journal of Micromechanics and Microengineering 20: 105001. Available: http://dx.doi.org/10.1088/0960-1317/20/10/105001. | |
dc.identifier.issn | 0960-1317 | |
dc.identifier.issn | 1361-6439 | |
dc.identifier.doi | 10.1088/0960-1317/20/10/105001 | |
dc.identifier.uri | http://hdl.handle.net/10754/599725 | |
dc.description.abstract | Superhydrophobic nano-flower surfaces were fabricated using MEMS technology and microwave plasma-enhanced chemical vapor deposition (MPCVD) of carbon nanotubes on silicon micro-post array surfaces. The nano-flower structures can be readily formed within 1-2 min on the micro-post arrays with the spacing ranging from 25 to 30 μm. The petals of the nano-flowers consisted of clusters of multi-wall carbon nanotubes. Patterned nano-flower structures were characterized using various microscopy techniques. After MPCVD, the apparent contact angle (160 ± 0.2°), abbreviated as ACA (defined as the measured angle between the apparent solid surface and the tangent to the liquid-fluid interface), of the nano-flower surfaces increased by 139% compared with that of the silicon micro-post arrays. The measured ACA of the nano-flower surface is consistent with the predicted ACA from a modified Cassie-Baxter equation. A high-speed CCD camera was used to study droplet impact dynamics on various micro/nanostructured surfaces. Both static testing (ACA and sliding angle) and droplet impact dynamics demonstrated that, among seven different micro/nanostructured surfaces, the nano-flower surfaces are the most robust superhydrophobic surfaces. © 2010 IOP Publishing Ltd. | |
dc.description.sponsorship | The authors would like to express the sincerest gratitude to Professor Robert H Austin from Princeton University for his helpful discussion and suggestions. They acknowledge Professor Tong-Xi Yu's Impact Dynamics Laboratory for providing the high-speed CCD camera for the study of droplet impact dynamics. They are also grateful to Dr Hongkai Wu for the silanization treatment of the silicon substrate and micro-post array surfaces, and the staff at the Nanoelectronic Fabrication Facility and the Material Characterization and Preparation Facility. The research was partially supported by a grant from Hong Kong Research Grants Council (ref no. 615907) and partially supported by a grant from King Abdullah University of Science and Technology (KAUST award no. SA-C0040/UK-C0016). | |
dc.publisher | IOP Publishing | |
dc.title | Static and dynamic characterization of robust superhydrophobic surfaces built from nano-flowers on silicon micro-post arrays | |
dc.type | Article | |
dc.identifier.journal | Journal of Micromechanics and Microengineering | |
dc.contributor.institution | Hong Kong University of Science and Technology, Hong Kong, China | |
kaust.grant.number | SA-C0040/UK-C0016 | |
dc.date.published-online | 2010-09-01 | |
dc.date.published-print | 2010-10-01 |