Gupta, Nitant and Kavya, M V and Singh, Yogesh and Jyothi, J and Barshilia, Harish C (2013) Superhydrophobicity on transparent fluorinated ethylene propylene films with nano-protrusion morphology by Ar+O2 plasma etching: Study of the degradation in hydrophobicity after exposure to the environment. Journal of Applied Physics, 114. p. 164307. ISSN 0021-8979
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Abstract
Fluorinated ethylene propylene (FEP) films were made superhydrophobic by Ar + O2 plasma etching process. Field emission scanning electron microscopy and atomic force microscopy studies of the plasma-treated FEP samples detected the presence of uniformly distributed nano-protrusions exhibiting a low surface roughness necessary for maintaining the transparency of the samples. In fact, optical transmittance measurements showed an improvement in the transparency of FEP samples after plasma treatment. The X-ray photoelectron spectroscopic analysis showed the presence of –CF x –O–CF x – (x = 1, 2, or 3) linkages in both untreated and plasma-treated samples which explains the hydrophilic nature (contact angle below 90∘) of the untreated sample. Fourier transform infrared spectroscopy showed no changes in the bulk properties of the plasma-treated samples. Moreover, exposure to the environment caused the surfaces to lose their superhydrophobic property in an indefinite amount of time. This has been further studied through a water immersion experiment and explained through the wetting state transition from Cassie state to Wenzel state.
Item Type: | Article |
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Additional Information: | Copyright to this article belongs to M/s. American Institute of Physics |
Uncontrolled Keywords: | Fluorinated ethylene propylene films;Superhydrophobicity;Ar+O2 plasma etching process;Nano-protrusion morphology |
Subjects: | AERONAUTICS > Aeronautics (General) GENERAL > General |
Depositing User: | Dr. Harish C. Barshilia |
Date Deposited: | 15 Jan 2014 05:35 |
Last Modified: | 16 Jun 2015 07:42 |
URI: | http://nal-ir.nal.res.in/id/eprint/11833 |
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