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Personen: Zettl, Ute (Autor) 
Hoffmann, Sebastian T. (Autor) 
Koberling, Felix (Autor) 
Krausch, Georg (Autor) 
Enderlein, J√∂rg (Autor) 
Harnau, Ludger (Autor) 
Ballauff, Matthias (Autor) 
  
Titel: Self-diffusion and cooperative diffusion in semidilute polymer solutions as measured by fluorescence correlation spectroscopy
  
Quelle: Macromolecules. Bd. 42. H. 24. Washington, DC : American Chemical Society. S. 9537 - 9547
Erscheinungsjahr:    2009
ISBN / ISSN: 0024-9297
URL der Originalveröffentlichung doi:10.1021/ma901404g
  
Dokumentart:
Zeitschriftenaufsatz Zeitschriftenaufsatz
Sprache: Englisch
Open Access:
Person der Universität:    Krausch, Georg  In UnivIS suchen 
Einrichtung: Universitätsleitung
DDC-Sachgruppe:    Physik
ID: 52592  Universitätsbibliothek Mainz
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Informationen zu den Nutzungsrechten unserer Inhalte Informationen zu den Nutzungsrechten unserer Inhalte
Abstract: We present a comprehensive investigation of polymer diffusion in the semidilute regime by fluorescence correlation spectroscopy (FCS) and dynamic light scattering (DLS). Using single-labeled polystyrene chains, FCS leads to the self-diffusion coefficient while DLS gives the cooperative diffusion coefficient for exactly the same molecular weights and concentrations. Using FCS we observe a new Fast mode in the semidilute entangled concentration regime beyond the slower mode which is due to self-diffusion. Comparison of FCS data with data obtained by DLS oil the same polymers shows that the second mode observed in FCS is identical to the cooperative diffusion coefficient Measured with DLS. Ail in-depth analysis and a comparison with current theoretical models demonstrates that the new cooperative mode observed in FCS is due to the effective long-range interaction of the chains through the transient entanglement network.
   
  
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