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Infrared imaging of surface confluent polydopamine (PDA) films at the nanoscale
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SYSNO ASEP 0563595 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Infrared imaging of surface confluent polydopamine (PDA) films at the nanoscale Author(s) Král, M. (CZ)
Dendisová, M. (CZ)
Matějka, P. (CZ)
Svoboda, Jan (UMCH-V) ORCID, RID
Pop-Georgievski, Ognen (UMCH-V) RID, ORCIDArticle number 112954 Source Title Colloids and Surfaces B-Biointerfaces. - : Elsevier - ISSN 0927-7765
Roč. 221, January (2023)Number of pages 8 s. Language eng - English Country NL - Netherlands Keywords polydopamine ; anchoring layers ; self-assembly Subject RIV CD - Macromolecular Chemistry OECD category Polymer science R&D Projects GA20-08679S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UMCH-V - RVO:61389013 UT WOS 000890519300004 EID SCOPUS 85141326673 DOI 10.1016/j.colsurfb.2022.112954 Annotation Polydopamine (PDA) is one of the most commonly used materials for the preparation of protective adhesive layers for biomedical and tribological applications. Despite its widespread use, the way in which the polymer binds to the substrate is yet to be fully understood. At the nanometre level, the spatial arrangement of individual molecules and the initial growth of PDA layers are expected to be influenced by the utilized substrate material and PDA deposition time. To investigate these hypotheses, we have prepared PDA layers with various times of deposition on surfaces of gold and oxygen-terminated materials (silicon/silicon dioxide and nitrogen-doped titanium oxide). The prepared samples were subsequently analysed using a scattering-type scanning near-field optical microscope utilizing four irradiation energies in the mid-infrared region to detect the chemical contrast originating from vibrational modes of selected chemical moieties. It was found that the polymerization process leads to a formation of a surface confluent PDA layer and deposition of PDA nanoaggregates. The differences in the optical contrast observed at irradiation energies corresponding to the vibrations of indole units of PDA and quinoid groups of polymerization intermediates indicated a slightly different composition of the nanoaggregates and the surrounding confluent layer. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2024 Electronic address https://www.sciencedirect.com/science/article/pii/S0927776522006385?via%3Dihub
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