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An Effect of Silicon Micro-/Nano-Patterning Arrays on Superhydrophobic Surface

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supaporn - Posted on 25 December 2011

TitleAn Effect of Silicon Micro-/Nano-Patterning Arrays on Superhydrophobic Surface
Publication TypeJournal Article
Year of Publication2011
AuthorsNithi Atthi, Onuma Nimittrakoolchai, Sitthisuntorn Supothina, Jakrapong Supadech, Wutthinan Jeamsaksiri, Apirak Pankiew, Charndet Hruanun, Amporn Poyai, นิธิ อัตถิ, อรอุมา นิมิตรตระกูลชัย, สิทธิสุนทร สุโพธิณะ, จักรพงศ์ ศุภเดช, วุฒินันท์ เจียมศักดิ์ศิริ, อภิรักษ์ ผันเขียว, ชาญเดช หรูอนันต์, อัมพร โพธิ์ใย
Author AddressThailand. National Science and Technology Development Agency. National Electronics and Computer Technology Center ; Thailand. National Science and Technology Development Agency. National Metals and Materials Technology Center
JournalJournal of Nanoscience and Nanotechnology,
Volume11
Issue10
Date PublishedOctober 2011
Start Page8967-8973
Pagination7 pages
ISSN1533-4880
DOI10.1166/jnn.2011.3505
AbstractSuperhydrophobic surface can be fabricated by creating a rough surface at very fine scale and modify it with low-surface energy material. To obtain the optimum superhydrophobicity, the surface roughness must be maximized. To avoid the limitation of scaling down the pattern size by using an expensive lithography tools, the surface roughness factor (r) was increased by means of changing an asperity shape so as to increase its overall surface area. In this paper, the patterns of the asperities under studied were wave stripes, line stripes, cylindrical pillars, square pillars, pentagonal pillars, hexagonal pillars, and octagonal pillars. All pillar shapes were arranged in square arrays, hexagonal arrays, and continuous stripes. The asperities sizes and the pitches were varied from 1 to 5 μm with 10 μm of asperity height. Then the patterned surfaces were coated with polydimethylsiloxane mixed with 10 wt% dicumylperoxide. It was found that the stripe asperities can generate only hydrophobic surface with water contact angle (WCA) of 135° to 145°. The pillars with square and hexagonal arrays had the WCA of 149° to 158°. The pentagonal pillars with square and hexagonal arrays achieved the highest WCA with an average WCA of 156°. It was evident that the pillar shape had significant effect on the superhydrophobicity.
KeywordsContact angle, Lithography, Materials engineering, Superhydrophobic surface, Water Repellent, Wenzel’s, ศูนย์เทคโนโลยีอิเล็กทรอนิกส์และคอมพิวเตอร์แห่งชาติ
Type of ArticleResearch article
Publication Languageeng