Hydrophobic surfaces with microscale roughness can be rendered ultrahydrophobic by the addition of sub-micron scale roughness. A simple yet highly effective concept of fabricating hierarchical structured surfaces using a single-step deep reactive ion etch process is proposed. Using this method the complexities generally associated with fabrication of two-tier roughness structures are eliminated. Experiments are conducted on two double-roughness surfaces with different surface roughness, achieved by varying the size of the microscale roughness features. The surfaces are characterized in terms of static contact angle and roll-off angle and compared with surfaces consisting of only single-tier microscale roughness. The robustness of the new hierarchical roughness surfaces is verified through droplet impingement tests. The hierarchical surfaces are more resistant to wetting than the single roughness surfaces and show higher coefficients of restitution for droplets bouncing off the surface. The droplet dynamics upon impingement are explored.
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ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems
July 6–8, 2011
Portland, Oregon, USA
Conference Sponsors:
- Electronic and Photonic Packaging Division
ISBN:
978-0-7918-4461-8
PROCEEDINGS PAPER
Single-Step Fabrication and Characterization of Ultrahydrophobic Surfaces With Hierarchical Roughness
Susmita Dash,
Susmita Dash
Purdue University, West Lafayette, IN
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Niru Kumari,
Niru Kumari
Purdue University, West Lafayette, IN
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Mercy Dicuangco,
Mercy Dicuangco
Purdue University, West Lafayette, IN
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Suresh V. Garimella
Suresh V. Garimella
Purdue University, West Lafayette, IN
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Susmita Dash
Purdue University, West Lafayette, IN
Niru Kumari
Purdue University, West Lafayette, IN
Mercy Dicuangco
Purdue University, West Lafayette, IN
Suresh V. Garimella
Purdue University, West Lafayette, IN
Paper No:
IPACK2011-52046, pp. 685-692; 8 pages
Published Online:
February 14, 2012
Citation
Dash, S, Kumari, N, Dicuangco, M, & Garimella, SV. "Single-Step Fabrication and Characterization of Ultrahydrophobic Surfaces With Hierarchical Roughness." Proceedings of the ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems. ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems, MEMS and NEMS: Volume 1. Portland, Oregon, USA. July 6–8, 2011. pp. 685-692. ASME. https://doi.org/10.1115/IPACK2011-52046
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