Superhydrophobic transparent films from silica powder: Comparison of fabrication methods

Li-Der Liu, Chao-Sung Lin, Mukul Tikekar, Ping-Hei Chen

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    13 Scopus citations

    Abstract

    The lotus leaf is known for its self-clean, superhydrophobic surface, which displays a hierarchical structure covered with a thin wax-like material. In this study, three fabrication techniques, using silicon dioxide particles to create surface roughness followed by a surface modification with a film of polydimethylsiloxane, were applied on a transparent glass substrate. The fabrication techniques differed mainly on the deposition of silicon dioxide particles, which included organic, inorganic, and physical methods. Each technique was used to coat three samples of varying particle load. The surface of each sample was evaluated with contact angle goniometer and optical spectrometer. Results confirmed the inverse relationships between contact angle and optical transmissivity independent of fabrication techniques. Microstructural morphologies also suggested the advantage of physical deposition over chemical methods. In summary, the direct sintering method proved outstanding for its contact angle vs transmissivity efficiency, and capable of generating a contact angle as high as 174°. © 2011 Elsevier B.V. All rights reserved.
    Original languageEnglish (US)
    Pages (from-to)6224-6229
    Number of pages6
    JournalThin Solid Films
    Volume519
    Issue number19
    DOIs
    StatePublished - Jul 2011

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