Abstract
Competitive adsorption kinetics of three diblock copolymers, a poly(dimethyl siloxane)-poly(ethylene oxide) and two polystyrene-poly(ethylene oxide), at a hydrophobic solid-oil−water interface are investigated, under a nonuniform distribution of the copolymer in the aqueous phase. When exposed to a variable concentration profile of the copolymer, the solid-oil−water interface evolves through a time-dependent shape reconformation of the captive oil drop, which, for the two copolymers, reveals some strong qualitative differences. While the poly(dimethyl siloxane)-poly(ethylene oxide) adsorption results in a monotonically or stepwise shrinking of the captive drop in the whole range of the kinetics, the two polystyrene compounds exhibit a autophobic-like transition (early spreading/late stage shrinking). Based on the similarity in the number fraction of ethylene oxide units in the poly(dimethyl siloxane)-poly(ethylene oxide) and one of the polystyrene compounds, this adsorption induced wetting singularity is ...
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