Nanoscale Study of Polymer Dynamics
| Autor: | Hans Engelkamp, Matthieu Koepf, Jan Vermant, Peter C. M. Christianen, Els Braeken, Roeland J. M. Nolte, Masoumeh Keshavarz, Anja Vananroye, Erik Schwartz, Jialiang Xu, Jan C. Maan, Johan Hofkens, Matthijs B. J. Otten, Frans C. De Schryver, Alan E. Rowan, Hiroshi Uji-i |
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| Rok vydání: | 2015 |
| Předmět: |
Soft Condensed Matter & Nanomaterials (HFML)
Work (thermodynamics) Materials science General Physics and Astronomy Nanotechnology Correlated Electron Systems / High Field Magnet Laboratory (HFML) 02 engineering and technology 010402 general chemistry 01 natural sciences Indirect evidence Spectroscopy of Solids and Interfaces Molecule General Materials Science Anisotropy Nanoscopic scale chemistry.chemical_classification Scattering Molecular Materials Dynamics (mechanics) General Engineering Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry ComputingMethodologies_DOCUMENTANDTEXTPROCESSING 0210 nano-technology Physical Organic Chemistry |
| Zdroj: | ACS Nano, 10, 1, pp. 1434-1441 ACS Nano, 10, 1434-1441 |
| ISSN: | 1936-086X 1434-1441 1936-0851 |
| Popis: | The thermal motion of polymer chains in a crowded environment is anisotropic and highly confined. Whereas theoretical and experimental progress has been made, typically only indirect evidence of polymer dynamics is obtained either from scattering or mechanical response. Toward a complete understanding of the complicated polymer dynamics in crowded media such as biological cells, it is of great importance to unravel the role of heterogeneity and molecular individualism. In the present work, we investigate the dynamics of synthetic polymers and the tube-like motion of individual chains using time-resolved fluorescence microscopy. A single fluorescently labeled polymer molecule is observed in a sea of unlabeled polymers, giving access to not only the dynamics of the probe chain itself but also to that of the surrounding network. We demonstrate that it is possible to extract the characteristic time constants and length scales in one experiment, providing a detailed understanding of polymer dynamics at the single chain level. The quantitative agreement with bulk rheology measurements is promising for using local probes to study heterogeneity in complex, crowded systems. |
| Databáze: | OpenAIRE |
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