Local Wear of Catechol-Containing Diblock Copolymer Layers: Wear Volume, Stick–Slip, and Nanomechanical Changes,The Journal of Physical Chemistry C

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Local Wear of Catechol-Containing Diblock Copolymer Layers: Wear Volume, Stick–Slip, and Nanomechanical Changes
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2021-09-21 , DOI: 10.1021/acs.jpcc.1c06859
Illia Dobryden ₁ , Medeina Steponavičiu̅tė ₂ , Daniel Hedman _{3,

4} , Vaidas Klimkevičius ₂ , Ričardas Makuška ₂ , Andra Dėdinaitė _{5,

6} , Xiaoyan Liu ₇ , Robert W. Corkery ₈ , Per Martin Claesson ₈

Affiliation

Experimental Physics, Division of Materials Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, Luleå SE-971 87, Sweden
Institute of Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania
Applied Physics, Division of Materials Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, Luleå SE-971 87, Sweden
Center for Multidimensional Carbon Materials, Institute for Basic Science (IBS), Ulsan 44919, Republic of Korea
KTH Royal Institute of Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Engineering Pedagogics, SE-100 44 Stockholm, Sweden
RISE Research Institutes of Sweden, Division of Bioscience and Materials, SE-114 86 Stockholm, Sweden
School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710062, China
KTH Royal Institute of Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Chemistry, Division of Surface and Corrosion Science, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden

Polymers containing catechol groups have gained a large interest, as they mimic an essential feature of mussel adhesive proteins that allow strong binding to a large variety of surfaces under water. This feature has made this class of polymers interesting for surface modification purposes, as layer functionalities can be introduced by a simple adsorption process, where the catechol groups should provide a strong anchoring to the surface. In this work, we utilize an AFM-based method to evaluate the wear resistance of such polymer layers in water and compare it with that offered by electrostatically driven adsorption. We pay particular attention to two block copolymer systems where the anchoring group in one case is an uncharged catechol-containing block and in the other case a positively charged and catechol-containing block. The wear resistance is evaluated in terms of wear volume, and here, we compare with data for similar copolymers with statistical distribution of the catechol groups. Monitoring of nanomechanical properties provides an alternative way of illustrating the effect of wear, and we use modeling to show that the stiffness, as probed by an AFM tip, of the soft layer residing on a hard substrate increases as the thickness of the layer decreases. The stick–slip characteristics are also evaluated.

中文翻译：

含儿茶酚二嵌段共聚物层的局部磨损：磨损量、粘滑和纳米机械变化

含有儿茶酚基团的聚合物引起了极大的兴趣，因为它们模拟了贻贝粘附蛋白的基本特征，可以在水下与各种表面强结合。这一特性使这类聚合物对表面改性目的很感兴趣，因为层官能团可以通过简单的吸附过程引入，其中儿茶酚基团应提供对表面的强锚定。在这项工作中，我们利用基于 AFM 的方法来评估此类聚合物层在水中的耐磨性，并将其与静电驱动吸附提供的耐磨性进行比较。我们特别注意两种嵌段共聚物系统，其中锚定基团在一种情况下是不带电荷的含邻苯二酚的嵌段，而在另一种情况下是带正电荷的含儿茶酚的嵌段。耐磨性是根据磨损量来评估的，在这里，我们将类似共聚物的数据与儿茶酚基团的统计分布进行比较。纳米力学性能的监测提供了一种说明磨损影响的替代方法，我们使用建模来表明，由 AFM 尖端探测到的软层的刚度随着层厚度的减小而增加。还评估了粘滑特性。位于硬基材上的软层的厚度随着层厚度的减小而增加。还评估了粘滑特性。位于硬基材上的软层的厚度随着层厚度的减小而增加。还评估了粘滑特性。

更新日期：2021-09-30

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