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Continuous gradient nanoporous film enabled by delayed directional diffusion of solvent and selective swelling.

08:00 EDT 10th April 2019 | BioPortfolio

Summary of "Continuous gradient nanoporous film enabled by delayed directional diffusion of solvent and selective swelling."

Nature-inspired porous structures are highly desired in the fields of new materials, sustainable energy, biological & chemical science, etc. Here, a new strategy for the fabrication of continuous, gradient nanoporous polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) film is established. The continuous nanopore gradient along the direction of film thickness (~120 μm) is achieved via delayed directional diffusion of dynamic binary solvent of ethanol/water and selective swelling of P2VP domains. Ethanol in binary solvent diffuses into the film from one side to another, which is retarded by the water gate as water is concentrated at the film surface. The delayed diffusion matches the swelling rate of P2VP domains, forming the continuous nanopore gradient normal to the film surface.

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This article was published in the following journal.

Name: Langmuir : the ACS journal of surfaces and colloids
ISSN: 1520-5827
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