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Rebound Suppression of a Droplet Impacting on a Supersolvophobic Surface by a Small Amount of Polymer Additives
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posted on 2021-01-12, 20:04 authored by Eunsang Lee, Hari Krishna Chilukoti, Florian Müller-PlatheA small amount of
polymer dissolved in a droplet suppresses droplet
rebound when it impinges on a supersolvophobic surface. This work
investigates impacting dynamics of a droplet of dilute polymer solution
depending on the molecular weight and the concentration of the polymer
by using multibody dissipative particle dynamics simulations. Either
the long polymer or the high polymer concentration suppresses rebound
of a droplet although its shear viscosity and the liquid–vapor
surface tension are not different from those of a pure solvent droplet.
We found a new mechanism of the anti-rebound in which the resistance
is applied against the hopping motion, while behavior of the non-rebounding
droplet at the earlier spreading and retraction stages is the same
as for the rebounding droplets. Two polymer contributions to reducing
the rebound tendency are quantitatively analyzed: the alteration of
the substrate wettability by the polymer adsorption and the polymer
elongation force.
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substrate wettabilitySmall Amountdroplet reboundPolymer AdditivesSupersolvophobic Surfacesupersolvophobic surfaceretraction stagespolymer adsorptionpolymer contributionsDroplet Impactingpolymer solutionpolymer elongation forceimpacting dynamicsrebound tendencypolymer concentrationmultibody dissipative particle dyna...Rebound Suppressionshear viscositynon-rebounding droplet