This title appears in the Scientific Report :
2020
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevLett.125.238004 in citations.
Please use the identifier: http://hdl.handle.net/2128/26803 in citations.
Self-Similar Dynamics of Large Polymer Rings: A Neutron Spin Echo Study
Self-Similar Dynamics of Large Polymer Rings: A Neutron Spin Echo Study
This work clarifies the self-similar dynamics of large polymer rings using pulsed-field gradient nuclear magnetic resonance and neutron spin echo spectroscopy. We find center of mass diffusion taking place in three dynamic regimes starting (i) with a strongly subdiffusive domain ⟨r2(t)⟩com∼tα (0.4≤α...
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Personal Name(s): | Kruteva, M. (Corresponding author) |
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Monkenbusch, M. / Allgaier, J. / Holderer, O. / Pasini, S. / Hoffmann, I. / Richter, D. | |
Contributing Institute: |
Neutronenstreuung; JCNS-1 Streumethoden; JCNS-2 JCNS-4; JCNS-4 JCNS-FRM-II; JCNS-FRM-II Heinz Maier-Leibnitz Zentrum; MLZ Neutronenstreuung und biologische Materie; IBI-8 |
Published in: | Physical review letters, 125 (2020) 23, S. 238004 |
Imprint: |
College Park, Md.
APS
2020
|
DOI: |
10.1103/PhysRevLett.125.238004 |
Document Type: |
Journal Article |
Research Program: |
FRM II / MLZ Soft Matter, Health and Life Sciences Jülich Centre for Neutron Research (JCNS) Functional Macromolecules and Complexes |
Subject (ZB): | |
Link: |
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Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/26803 in citations.
This work clarifies the self-similar dynamics of large polymer rings using pulsed-field gradient nuclear magnetic resonance and neutron spin echo spectroscopy. We find center of mass diffusion taking place in three dynamic regimes starting (i) with a strongly subdiffusive domain ⟨r2(t)⟩com∼tα (0.4≤α≤0.65); (ii) a second subdiffusive region ⟨r2(t)⟩com∼t0.75 that (iii) finally crosses over to Fickian diffusion. While the t0.75 range previously has been found in simulations and was predicted by theory, we attribute the first to the effect of cooperative dynamics resulting from the correlation hole potential. The internal dynamics at scales below the elementary loop size is well described by ring Rouse motion. At larger scales the dynamics is self-similar and follows very well the predictions of the scaling models with preference for the self-consistent fractal loopy globule model. |