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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".

Authors
  • Marcasuzaa, Pierre1
  • Save, Maud2
  • Gérard, Pierre3
  • Billon, Laurent4
  • 1 Universite de Pau et Pays Adour, E2S UPPA, CNRS, IPREM UMR 5254, 2 avenue du Président Angot, Pau F-64053, France; Bio-inspired Materials Group: Functionalities & Self-assembly, Universite de Pau et Pays Adour, 2 avenue du Président Angot, Pau F-64053, France. , (France)
  • 2 Universite de Pau et Pays Adour, E2S UPPA, CNRS, IPREM UMR 5254, 2 avenue du Président Angot, Pau F-64053, France. , (France)
  • 3 Arkema, Groupement de Recherches de lacq, RN 117, 64170 Lacq, France. , (France)
  • 4 Universite de Pau et Pays Adour, E2S UPPA, CNRS, IPREM UMR 5254, 2 avenue du Président Angot, Pau F-64053, France; Bio-inspired Materials Group: Functionalities & Self-assembly, Universite de Pau et Pays Adour, 2 avenue du Président Angot, Pau F-64053, France. Electronic address: [email protected] , (France)
Type
Published Article
Journal
Journal of Colloid and Interface Science
Publisher
Elsevier
Publication Date
Jul 29, 2020
Volume
581
Issue
Pt A
Pages
96–101
Identifiers
DOI: 10.1016/j.jcis.2020.07.130
PMID: 32771753
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Hierarchically structured surfaces including sensitive materials presents the advantage to exalt wettability variation due to the combination of micro structure effect directed by Cassie Baxter and/or Wenzel behaviour which is tuned by the surface energy variation of sensitive polymer films. Herein is reported the synthesis and the hierarchical structuration of a pH sensitive diblock copolymer P(S-stat-MMA)-b-P4VP with a pH-sensitive Poly 4-vinylpyridine P4VP block. Applying the Breath Figure method casting (minute time scale process), this diblock copolymer allows to obtain a micro porous honeycomb film while a wall nano-structuration due to self-assembly of diblock copolymer is observed. The pH-triggered wettability is studied and correlated with the morphology evolution of P4VP nano-domains investigated by AFM in a liquid cell. Indeed, a nano-dots to nano-rings/donuts transition is highlighted when decreasing the pH below the pKa of the P4VP. This nano "sea Anemone" shape transition induces the macroscopic changes of the wettability of a hierarchically self-organized honeycomb film, explained by the protonation of P4VP chains inducing electrostatic repulsion and then hydrophilic surface. Copyright © 2020 Elsevier Inc. All rights reserved.

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