Structural optimization of super-repellent surfaces

Andrea Cavalli, Peter Bøggild, Fridolin Okkels

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    Abstract

    Micro-patterning is an effective way to achieve surfaces with extreme liquid repellency. This technique does not rely on chemical coatings and is therefore a promising concept for application in food processing and bio-compatibile coatings. This super-repellent behaviour is obtained by suspending the liquid phase on a brush of micro- and nano-posts. In this way the contact with the substrate is minimized, and so is the adhesion force. While a lot of experimental work has been carried out in this field, relatively little has been done from a theoretical point in rationalizing and optimizing the geometry of the posts that generate the super-repellent effect. We here present two different approaches to obtain optimal liquid repellent surfaces, addressing some fundamental aspects of the problem. First, we focus on the wetting aspect, and we apply topology optimization to search for an optimal pattern to support the liquid phase in the suspended state [1]. Second, we consider simpler geometries, but we account for both the wetting and mechanical properties of the micro-posts, observing an interesting balance of conflicting design objectives [2]. In conclusion, we present a wide perspective on how numeric optimization tools can be applied to increase the understanding of this new, dynamic engineering field.
    Original languageEnglish
    Title of host publicationProceedings of the 10th World Congress on Structural and Multidisciplinary Optimization
    Number of pages8
    Publication date2013
    Publication statusPublished - 2013
    Event10th World Congress on Structural and Multidisciplinary Optimization - Renaissance Orlando at SeaWorld Orlando, Orlando, FL, United States
    Duration: 19 May 201324 May 2013
    Conference number: 10
    http://conferences.dce.ufl.edu/wcsmo-10/default.aspx?page=975

    Conference

    Conference10th World Congress on Structural and Multidisciplinary Optimization
    Number10
    LocationRenaissance Orlando at SeaWorld Orlando
    CountryUnited States
    CityOrlando, FL
    Period19/05/201324/05/2013
    Internet address

    Keywords

    • Superhydrophobicity
    • Topology Optimization
    • Microfabrication
    • Multi-objective optimization

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