Collective Intermolecular Motions Dominate the Picosecond Dynamics of Short Polymer Chains

Morhenn H, Busch S, Meyer H, Richter D, Petry W, Unruh T (2013)

Publication Status: Published

Publication Type: Journal article

Publication year: 2013

Journal

Physical Review Letters American Physical Society

Publisher: AMER PHYSICAL SOC

Book Volume: 111

Journal Issue: 17

DOI: 10.1103/PhysRevLett.111.173003

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.

Authors with CRIS profile

Tobias Unruh Professur für Nanomaterialcharakterisierung (Streumethoden)

Additional Organisation(s)

Exzellenz-Cluster Engineering of Advanced Materials (EAM)

Involved external institutions

Technische Universität München (TUM) DE Germany (DE) Université de Strasbourg (UDS) FR France (FR) Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE)

How to cite

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://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).

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