Abstract
Dewetting of thin films is a simple and thus highly convenient process for creating regularly ordered topographical patterns on various lengthscales. Here, we present a general pathway, based on dewetting of a thin polymer film, which allows to convert a chemical surface pattern of hexagonally arranged non-wettable circular patches into a sequence of ordered three-dimensional topographies. With increasing thickness of the dewetting film, cylindrical holes followed by droplets with the shape of a spherical cap and finally toroids were generated. We identified the width w of the rim, where the dewetted fluid was collected, as the crucial parameter which determined the final three-dimensional morphology. When the rim was spanning regions of varying wettability, redistribution of fluid within the rim was at the origin of morphological changes occurring in the course of dewetting. Such induced flow led to a decrease of material on the more wettable parts of the substrate and to an increase of material on the non-wettable patches, eventually causing the detachment of droplets from the rim. Such detachment of droplets occurred for films below a maximum thickness h max determined by the maximum volume of the resulting droplet. For films thicker than h max, flow of material between regions of different wettability was not able to create sections of the rim which were thin enough to allow for the detachment of droplets. Thus, for films thicker than h max, the dewetted area was surrounded by a wide rim with a circular shape. Our experiments demonstrate that for a given surface pattern various three-dimensional morphologies can be obtained by simply varying the initial thickness of the thin film.
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Acknowledgments
The authors acknowledge the Centre Suisse d’Electronique et de Microtechnique SA (CSEM, Neuchâtel, Switzerland) for the fabrication of micro-structured moulds. Help of Hanan ASSAF at an initial stage of this work is highly appreciated.
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Al Akhrass, S., Vonna, L., Reiter, G. (2015). From Holes to Drops to Toroids: Conditions for the Transcription of Surface Patterns into Three-Dimensional Morphologies via Rim Instabilities in the Course of Dewetting. In: Rodríguez-Hernández, J., Drummond, C. (eds) Polymer Surfaces in Motion. Springer, Cham. https://doi.org/10.1007/978-3-319-17431-0_2
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DOI: https://doi.org/10.1007/978-3-319-17431-0_2
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