Two-dimensional polymers investigated by scanning near-field optical microscopy: Conformation of single polymer chain in monolayer
| Autor: | Shinzaburo Ito, Makoto Anryu, Hiroyuki Aoki |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics scanning near-field optical microscopy Organic Chemistry Near and far field Polymer Methacrylate Random walk law.invention Crystallography chemistry Chain (algebraic topology) Optical microscope law monolayer Monolayer Polymer chemistry Materials Chemistry single polymer chain Near-field scanning optical microscope |
| Zdroj: | POLYMER. 46(16):5896-5902 |
| ISSN: | 0032-3861 |
| Popis: | The conformation of single polymer chain restricted in a two-dimensional plane was studied by scanning near-field optical microscopy (SNOM). The single dye-labeled chain in a monolayer of poly(isobutyl methacrylate) (PiBMA) with a high molecular weight of ca. 5!10 6 was directly observed by SNOM as a circular shape with a diameter of 200‐300 nm. The observed chain size was considerably smaller than that for a self-avoiding random walk chain generated by computer simulation, indicating that the polymer chain takes a contracted conformation in two dimensions. SNOM imaging was carried out for the labeled PiBMA chain dispersed in the matrix monolayer with 1000times lower molecular weight. The long chain isolated among shorter chains had an expanded form as large as a random conformation. These results were in good agreement with the scaling theory, providing an unambiguous evidence for the first time with the real image for a single chain conformation by SNOM. q 2005 Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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