Journal Article

FZJ-2020-05240

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Self-Similar Dynamics of Large Polymer Rings: A Neutron Spin Echo Study

Kruteva, M. (Corresponding author)FZJ* ; Monkenbusch, M.FZJ* ; Allgaier, J.FZJ* ; Holderer, O.FZJ* ; Pasini, S.FZJ* ; Hoffmann, I. ; Richter, D.FZJ*

2020
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/26803  doi:10.1103/PhysRevLett.125.238004

Abstract: 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.

Keyword(s): Polymers, Soft Nano Particles and Proteins (1st) ; Soft Condensed Matter (2nd) ; Chemistry (2nd)

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Contributing Institute(s):

1. Neutronenstreuung (JCNS-1)
2. Neutronenstreuung und biologische Materie (IBI-8)
3. Heinz Maier-Leibnitz Zentrum (MLZ)
4. JCNS-FRM-II (JCNS-FRM-II)
5. JCNS-4 (JCNS-4)
6. Streumethoden (JCNS-2)

Research Program(s):

1. 551 - Functional Macromolecules and Complexes (POF3-551) (POF3-551)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)
3. 6215 - Soft Matter, Health and Life Sciences (POF3-621) (POF3-621)
4. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)

Experiment(s):

1. J-NSE: Neutron spin-echo spectrometer (NL2ao)

Appears in the scientific report 2020

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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