Bioinspired Adhesion Polymers: Wear Resistance of Adsorption Layers
| Autor: | Robert W. Corkery, Andra Dėdinaitė, Xiaoyan Liu, Vaidas Klimkevičius, Illia Dobryden, Ricardas Makuska, Medeina Steponavičiu̅tė, Per M. Claesson |
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| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
02 engineering and technology Surfaces and Interfaces Polymer Adhesion 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Wear resistance Adsorption chemistry Chemical engineering Electrochemistry General Materials Science Adhesive 0210 nano-technology Spectroscopy |
| Zdroj: | Langmuir. 35:15515-15525 |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | Mussel adhesive polymers owe their ability to strongly bind to a large variety of surfaces under water to their high content of 3,4-dihydroxy-l-phenylalanine (DOPA) groups and high positive charge. In this work, we use a set of statistical copolymers that contain medium-length poly(ethylene oxide) side chains that are anchored to the surface in three different ways: by means of (i) electrostatic forces, (ii) catechol groups (as in DOPA), and (iii) the combination of electrostatic forces and catechol groups. A nanotribological scanning probe method was utilized to evaluate the wear resistance of the formed layers as a function of normal load. It was found that the combined measurement of surface topography and stiffness provided an accurate assessment of the wear resistance of such thin layers. In particular, surface stiffness maps allowed us to identify the initiation of wear before a clear topographical wear scar was developed. Our data demonstrate that the molecular and abrasive wear resistance on silica surfaces depends on the anchoring mode and follows the order catechol groups combined with electrostatic forcescatechol groups aloneelectrostatic forces alone. The devised methodology should be generally applicable for evaluating wear resistance or "robustness" of thin adsorbed layers on a variety of surfaces. |
| Databáze: | OpenAIRE |
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