Volume 16, Issue 5 (2016)                   IQBQ 2016, 16(5): 389-395 | Back to browse issues page

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Ahmadi B, Talesh Bahrami H R, Saffari H. Production of superhydrophobic copper surfaces by fabricating micro-nano features using wet etching process. IQBQ. 2016; 16 (5) :389-395
URL: http://journals.modares.ac.ir/article-15-10885-en.html
1- Associate Prof., Head of Department, School of Mechanical Engineering/ Iran University of Science and Technology
Abstract:   (19800 Views)
Superhydrophobic surfaces received many applications in various industries such as desalinization, heat exchanger, anti-fog and self-cleaning surface production. In this study a wet etching process were used to produce superhydrophobic copper surfaces. The specimens were etched by multiple ferric chloride and deionized water solutions to create micro-nano structures on their surfaces. The electronic scanning electron microscopy (SEM) images of the resulted surfaces show a formation of micro-nano structures with specific templates. Contact and sliding angle measurement of surfaces after etching process show that contact angles of specimens improve to nearly 140o while sliding angle of all samples were 180o , which is the same as a rose petal property. In the next step, to promote hydrophobicity of surfaces, increase contact angle and decrease sliding angle, specimens were immersed in an ethanol and stearic acid solution with a specific concentration. As well as, effects of etching time and etchant concentration on the sliding and contact angles with/without stearic acid modification were investigated. Results show that contact angles increased and sliding angles decreased remarkably so that it reduced to lower than 10o in some cases and lotus effect were achieved.
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Article Type: Research Article | Subject: Experimental Fluid Mechanics & Heat Transfer
Received: 2016/03/10 | Accepted: 2016/05/10 | Published: 2016/06/5

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