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.

中文翻译：

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当pH触发的纳米图案形状转变驱动分层自组织膜的润湿性时：“海葵”的生物启发效应。

假设

由于由卡西·巴克斯特（Cassie Baxter）指导的微观结构效应和/或由敏感聚合物薄膜的表面能变化调节的Wenzel行为的结合，包含敏感材料的分层结构表面具有提高润湿性变化的优势。

实验

本文报道了具有pH敏感的聚4-乙烯基吡啶P4VP嵌段的pH敏感的二嵌段共聚物P（S- stat- MMA）-b -P4VP的合成和分级结构。通过使用“呼吸图”方法浇铸（分钟时间刻度过程），该二嵌段共聚物可制得微孔蜂窝状薄膜，同时观察到由于二嵌段共聚物的自组装而产生的壁纳米结构。

发现

研究了pH触发的润湿性，并将其与通过AFM在液体细胞中研究的P4VP纳米域的形态演变相关。实际上，当将pH值降低到P4VP的pK a以下时，会突出显示从纳米点到纳米环/甜甜圈的过渡。纳米级“海葵”形状转变引起了自组织蜂窝状薄膜的润湿性的宏观变化，这可以通过P4VP链的质子化引起静电排斥，然后产生亲水性表面来解释。