Liquid nanodroplets spreading on chemically patterned surfaces

Langmuir : the ACS Journal of Surfaces and Colloids
Gary S GrestEdmund B Webb

Abstract

Controlling the spatial distribution of liquid droplets on surfaces via surface energy patterning can be used to deliver material to specified regions via selective liquid/solid wetting. Although studies of the equilibrium shape of liquid droplets on heterogeneous substrates exist, much less is known about the corresponding wetting kinetics. Here we present large-scale atomistic simulations of liquid nanodroplets spreading on chemically patterned surfaces. Results are presented for lines of polymer liquid (droplets) on substrates consisting of alternating strips of wetting (equilibrium contact angle theta0 = 0 degrees) and nonwetting (theta0 approximately 90 degrees) material. Droplet spreading is compared for different wavelength lambda of the pattern and strength of surface interaction on the wetting strips. For small lambda, droplets partially spread on both the wetting and nonwetting regions of the substrate to attain a finite contact angle less than 90 degrees. In this case, the extent of spreading depends on the interaction strength in the wetting regions. A transition is observed such that, for large lambda, the droplet spreads only on the wetting region of the substrate by pulling material from nonwetting regions. In mo...Continue Reading

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Mar 9, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·A Dupuis, J M Yeomans
Oct 4, 2005·Physical Review Letters·David R HeineEdmund B Webb

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Citations

Dec 3, 2008·The Journal of Chemical Physics·Jonathan D HalversonJoel Koplik
Aug 17, 2010·The Journal of Chemical Physics·Hongfei WuKristen A Fichthorn
Oct 26, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Elizabeth S Savoy, Fernando A Escobedo
Jun 9, 2016·Lab on a Chip·Ondřej KašparDan V Nicolau
Jun 15, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Janne T Hirvi, Tapani A Pakkanen

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