Regensburg 2016 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 41: Crystallization, Nucleation, Self Assembly II (joint session CPP/DY, organized by CPP)

CPP 41.1: Invited Talk

Wednesday, March 9, 2016, 16:00–16:30, H42

From holes to drops to toroids: Transcription of surface patterns into 3D-morphologies by dewetting — •Günter Reiter¹, Samer Al Akhrass², and Laurant Vonna³ — ¹Institute of Physics and Freiburg Materials Research Centre, University of Freiburg, 79104 Freiburg, Germany — ²Université Claude Bernard Lyon 1, Ingénierie des Matèriaux Polymeres (IMP - UMR CNRS 5223), 15 Boulevard Latarjet, 69622 Villeurbanne Cedex, France — ³Institut de Science des Matériaux de Mulhouse, (IS2M - UMR CNRS 7361), 15, rue Jean Starcky 68057 Mulhouse Cedex, France

Dewetting of thin films is a simple and thus highly convenient process for creating regularly ordered topographical patterns on various length-scales. 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. 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.