期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 581, 期 -, 页码 96-101出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.07.130
关键词
Hierarchical structure; pH sensitive surface; Wettability; Micro and nano structuration; Honeycomb film
资金
- ARKEMA
- GENESIS project
By synthesizing a pH-sensitive diblock copolymer and structuring it hierarchically, the study investigates the pH-triggered wettability changes and their correlation with the morphological evolution of P4VP nano-domains.
Hypothesis: 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. Experiments: 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. Findings: 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. (C) 2020 Elsevier Inc. All rights reserved.
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