Conformation in Ultrathin Polymer Brush Coatings Resolved by Infrared Nanoscopy
| Autor: | Andres de los Santos Pereira, Radoslava Sivkova, Adrian Cernescu, Jan Svoboda, Fritz Keilmann, Ognen Pop-Georgievski, Bogdana Bashta, Iryna Romanenko |
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| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Length scale Ethylene oxide Infrared Rays Surface Properties Chemistry Infrared 010401 analytical chemistry Molecular Conformation Polymer 010402 general chemistry Polymer brush 01 natural sciences Spectral line Polyethylene Glycols 0104 chemical sciences Analytical Chemistry Crystallography chemistry.chemical_compound Phase (matter) Nanotechnology Particle Size Layer (electronics) |
| Zdroj: | Analytical Chemistry. 92:4716-4720 |
| ISSN: | 1520-6882 0003-2700 |
| Popis: | Polymer brush coatings are effective in preventing blood coagulation or bacterial attachment, but their chain conformation, while vital for this effect, was never characterized in high spatial resolution. Here, we report mid-infrared spectroscopic nanoscopy studies of few-nanometer-thin poly(ethylene oxide) (PEO) films which reveal marked spectral variations along the surface at a length scale smaller than 100 nm and originating only from the physical conformation of the chains. The conformation and average orientation of the polymer chains in the layer is extracted from the spectra with the aid of theoretic modeling, confirming the spontaneous formation of a crystalline phase. This result suggests spectroscopic nanoscopy as a powerful new tool to characterize polymer brush coatings. |
| Databáze: | OpenAIRE |
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