| Autor: |
Shimoaka T; Laboratory of Solution and Interface Chemistry, Division of Environmental Chemistry, Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan., Rikiyama K, Katsumoto Y, Hasegawa T |
| Jazyk: |
angličtina |
| Zdroj: |
Analytical and bioanalytical chemistry [Anal Bioanal Chem] 2013 Nov; Vol. 405 (29), pp. 9411-8. Date of Electronic Publication: 2013 Oct 15. |
| DOI: |
10.1007/s00216-013-7400-5 |
| Abstrakt: |
Poly(N-isopropylacrylamide) (PNiPAM) compounds with various diad tacticities were prepared, and the molecular interaction properties in a thin film deposited on a gold surface were analyzed using infrared spectroscopy. The intramolecular and intermolecular interactions were found to depend on the tacticity, and only atactic (diad ratio 46 %) PNiPAM exhibits poor molecular interaction even in the bulk sample. On the other hand, the same series of compounds dissolved in an acetone solution were spread on a gold surface to form a thin film. In the dissolution process, the polymer molecules are relaxed via solvation, and they are bound to the gold surface by a molecular interaction to form a submonolayer thin film. In the thin film, the molecular interaction with the gold surface via the N-H group was monitored in the infrared spectra only for a nearly isotactic (m = 90) PNiPAM by an apparent shift of the N-H stretching vibration band. This shift was confirmed by changing the degree of hydrophilicity of the gold surface: a larger shift is found on a gold surface with stronger hydrophilicity. As a result, the conformation of a nearly isotactic molecule is found to be extended by the interaction with the gold surface, which works to immobilize the molecule. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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