Collective Intermolecular Motions Dominate the Picosecond Dynamics of Short Polymer Chains

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Morhenn H, Busch S, Meyer H, Richter D, Petry W, Unruh T
Zeitschrift: Physical Review Letters
Verlag: AMER PHYSICAL SOC
Jahr der Veröffentlichung: 2013
Band: 111
Heftnummer: 17
ISSN: 0031-9007


Abstract


Neutron scattering and extensive molecular dynamics simulations of an all atom C100H202 system were performed to address the short-time dynamics leading to center-of-mass self-diffusion. The simulated dynamics are in excellent agreement with resolution resolved time-of-flight quasielastic neutron scattering. The anomalous subdiffusive center-of-mass motion could be modeled by explicitly accounting for viscoelastic hydrodynamic interactions. A model-free analysis of the local reorientations of the molecular backbone revealed three relaxation processes: While two relaxations characterize local bond rotation and global molecular reorientation, the third component on intermediate times could be attributed to transient flowlike motions of atoms on different molecules. The existence of these collective motions, which are clearly visualized in this Letter, strongly contribute to the chain relaxations in molecular liquids.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Unruh, Tobias Prof. Dr.
Professur für Nanomaterialcharakterisierung (Streumethoden)


Zusätzliche Organisationseinheit(en)
Exzellenz-Cluster Engineering of Advanced Materials


Einrichtungen weiterer Autorinnen und Autoren

Forschungszentrum Jülich GmbH (FZJ)
Technische Universität München (TUM)
Université de Strasbourg (UDS)


Forschungsbereiche

A2 Nanoanalysis and Microscopy
Exzellenz-Cluster Engineering of Advanced Materials


Zitierweisen

APA:
Morhenn, H., Busch, S., Meyer, H., Richter, D., Petry, W., & Unruh, T. (2013). Collective Intermolecular Motions Dominate the Picosecond Dynamics of Short Polymer Chains. Physical Review Letters, 111(17). https://dx.doi.org/10.1103/PhysRevLett.111.173003

MLA:
Morhenn, Humphrey, et al. "Collective Intermolecular Motions Dominate the Picosecond Dynamics of Short Polymer Chains." Physical Review Letters 111.17 (2013).

BibTeX: 

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