Creating controlled thickness gradients in polymer thin films via flowcoating

Raleigh L. Davis, Sahana Jayaraman, Paul M. Chaikin, Richard A. Register

    Research output: Contribution to journalArticle

    Abstract

    Flowcoating is a popular technique for generating thin (5-200 nm), substrate-supported polymer films. In this process, a reservoir of coating fluid is held between the horizontal substrate and a nearly horizontal blade above the substrate; a film of fluid is drawn out of the reservoir by moving the substrate. Accelerating the substrate produces a film with a thickness gradient, particularly useful for high-throughput measurements where film thickness is an important parameter. The present work compares experimental film thickness profiles with a model based on a Landau-Levich treatment to identify the experimental parameters which govern film thickness. The key parameters are the capillary number and the radius of curvature of the reservoirs static meniscus, which is set by the blade angle, gap height, solution reservoir volume, and contact angles of the fluid with the blade and substrate. The results show excellent quantitative agreement with the first-principles model; the model thus provides a design approach which allows a user to produce polymer thin films of virtually any desired thickness profile.

    Original languageEnglish (US)
    Pages (from-to)5637-5644
    Number of pages8
    JournalLangmuir
    Volume30
    Issue number19
    DOIs
    StatePublished - May 20 2014

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Surfaces and Interfaces
    • Spectroscopy
    • Electrochemistry

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  • Cite this

    Davis, R. L., Jayaraman, S., Chaikin, P. M., & Register, R. A. (2014). Creating controlled thickness gradients in polymer thin films via flowcoating. Langmuir, 30(19), 5637-5644. https://doi.org/10.1021/la501247x