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When a pH-triggered nanopatterned shape transition drives the wettability of a hierarchically self-organized film: a bio-inspired effect of “sea Anemone”

Abstract : Hypothesis:Hierarchically structured surfaces including sensitive materials presents the advantage toexalt wettability variation due to the combination of micro structure effect directed by Cassie Baxterand/or Wenzel behaviour which is tuned by the surface energy variation of sensitive polymer films.Experiments:Herein is reported the synthesis and the hierarchical structuration of a pH sensitive diblockcopolymer P(S-stat-MMA)-b-P4VP with a pH-sensitive Poly 4-vinylpyridine P4VP block. Applying theBreath Figure method casting (minute time scale process), this diblock copolymer allows to obtain amicro porous honeycomb film while a wall nano-structuration due to self-assembly of diblock copolymeris observed.Findings:The pH-triggered wettability is studied and correlated with the morphology evolution of P4VPnano-domains investigated by AFM in a liquid cell. Indeed, a nano-dots to nano-rings/donuts transition ishighlighted when decreasing the pH below thepKa of the P4VP. This nano ‘‘sea Anemone” shape transi-tion induces the macroscopic changes of the wettability of a hierarchically self-organized honeycombfilm, explained by the protonation of P4VP chains inducing electrostatic repulsion and then hydrophilicsurface.
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https://hal-univ-pau.archives-ouvertes.fr/hal-02911024
Contributor : Laurent Billon <>
Submitted on : Monday, August 3, 2020 - 3:55:01 PM
Last modification on : Tuesday, August 25, 2020 - 3:25:49 AM

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Pierre Marcasuzaa, Maud Save, Pierre Gerard, Laurent Billon. When a pH-triggered nanopatterned shape transition drives the wettability of a hierarchically self-organized film: a bio-inspired effect of “sea Anemone”. Journal of Colloid and Interface Science, Elsevier, 2021, 581 (Part A), pp.96-101. ⟨10.1016/j.jcis.2020.07.130⟩. ⟨hal-02911024⟩

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