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

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: Journal Article
    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
    Division/Department: Surface Engineering Division, Surface Engineering Division, Surface Engineering Division, Surface Engineering Division, Surface Engineering Division
    Depositing User: Dr. Harish C. Barshilia
    Date Deposited: 15 Jan 2014 11:05
    Last Modified: 16 Jun 2015 13:12
    URI: http://nal-ir.nal.res.in/id/eprint/11833

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