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Spinodal Dewetting on Chemically Patterned Substrates



A Sehgal, V Ferreiro, Jack F. Douglas, Eric J. Amis, Alamgir Karim


We utilize chemically patterned substrates with arrays of progressively narrower stripes (1-15 mm) to investigate the influence of pattern size on the morphology of dewetting polystyrene films. The early-stage dewetting patterns align with the substrate patterns, leading to the formation of correlated droplet arrays. The droplets become anisotropic after they coarsen to a scale comparable to the stripe width, and then undergo a morphological transition to circular shaped droplets that cross multiple stripes. This leads to quantization of droplet size and contact-angle.
Physical Review Letters


anisotropic spinodal dewetting, atomic force microscopy, contact angles, high-throughput, morphological transitions, polymer thin-films, self-assembled monolayers


Sehgal, A. , Ferreiro, V. , Douglas, J. , Amis, E. and Karim, A. (2008), Spinodal Dewetting on Chemically Patterned Substrates, Physical Review Letters (Accessed April 17, 2024)
Created October 16, 2008