Self-Stratification During Film Formation from Latex Blends Driven by Differences in Collective Diffusivity

Self-Stratification During Film Formation from Latex Blends Driven by Differences in Collective Diffusivity

Coatings with vertical gradients in composition were produced by drying an aqueous polymer dispersion containing both charged and neutral particles. After drying, the neutral component was enriched at the film/air interface. The spontaneous vertical segregation between the two types of particles goe...

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Veröffentlicht in:Langmuir 2010-08, Vol.26 (16), p.13162-13167
Hauptverfasser: Nikiforow, Irina, Adams, Jörg, König, Alexander M, Langhoff, Arne, Pohl, Katja, Turshatov, Andrey, Johannsmann, Diethelm
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Colloids: Surfactants and Self-Assembly, Dispersions, Emulsions, Foams
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container_end_page 13167
container_issue 16
container_start_page 13162
container_title Langmuir
container_volume 26
creator Nikiforow, Irina
Adams, Jörg
König, Alexander M
Langhoff, Arne
Pohl, Katja
Turshatov, Andrey
Johannsmann, Diethelm
description Coatings with vertical gradients in composition were produced by drying an aqueous polymer dispersion containing both charged and neutral particles. After drying, the neutral component was enriched at the film/air interface. The spontaneous vertical segregation between the two types of particles goes back to a difference in collective diffusivity. As the film dries, a layer enriched in polymer develops at the top. Due to their mutual repulsion, charged spheres escape from this layer more quickly than their neutral counterparts. Provided that the total time of drying is between the times of diffusion for the two types of particles (∼H 0 2/D c with H 0 the initial film thickness and D c the collective diffusivity of the respective species), a concentration gradient persists after the film has turned dry. This effect can be used to create a functionally graded material (FGM) in a single coating step.
doi_str_mv 10.1021/la101697r
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title Self-Stratification During Film Formation from Latex Blends Driven by Differences in Collective Diffusivity
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