One-Dimensional Anomalous Diffusion of Gold Nanoparticles in a Polymer Melt.

Journal Article (Journal Article)

We investigated the dynamics of polymer-grafted gold nanoparticles loaded into polymer melts using x-ray photon correlation spectroscopy. For low molecular weight host matrix polymer chains, normal isotropic diffusion of the gold nanoparticles is observed. For larger molecular weights, anomalous diffusion of the nanoparticles is observed that can be described by ballistic motion and generalized Lévy walks, similar to those often used to discuss the dynamics of jammed systems. Under certain annealing conditions, the diffusion is one-dimensional and related to the direction of heat flow during annealing and is associated with an dynamic alignment of the host polymer chains. Molecular dynamics simulations of a single gold nanoparticle diffusing in a partially aligned polymer network semiquantitatively reproduce the experimental results to a remarkable degree. The results help to showcase how nanoparticles can under certain circumstances move rapidly in polymer networks.

Full Text

Duke Authors

Cited Authors

  • Song, J-J; Bhattacharya, R; Kim, H; Chang, J; Tang, T-Y; Guo, H; Ghosh, SK; Yang, Y; Jiang, Z; Kim, H; Russell, TP; Arya, G; Narayanan, S; Sinha, SK

Published Date

  • March 2019

Published In

Volume / Issue

  • 122 / 10

Start / End Page

  • 107802 -

PubMed ID

  • 30932658

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.122.107802

Language

  • eng