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

被引：15

作者：

Song, Jing-Jin ^{[1
]}

Bhattacharya, Rupak ^{[2
]}

Kim, Hyunki ^{[3
]}

Chang, Jooyoung ^{[3
]}

Tang, Tsung-Yeh ^{[4
]}

Guo, Hongyu ^{[5
]}

Ghosh, Sajal K. ^{[2
]}

Yang, Yi ^{[2
]}

Jiang, Zhang ^{[6
]}

Kim, Hyeyoung ^{[3
]}

Russell, Thomas P. ^{[3
]}

Arya, Gaurav ^{[4
]}

Narayanan, Suresh ^{[6
]}

Sinha, Sunil K. ^{[2
]}

机构：

[1] Univ Calif San Diego, Dept Mat Sci & Engn, 9500 Gilman Dr, La Jolla, CA 92093 USA

[2] Univ Calif San Diego, Dept Phys, 9500 Gilman Dr, La Jolla, CA 92093 USA

[3] Univ Massachusetts, Polymer Sci & Engn Dept, Amherst, MA 01003 USA

[4] Univ Calif San Diego, Dept NanoEngn, 9500 Gilman Dr, La Jolla, CA 92093 USA

[5] NIST, 100 Bur Dr, Gaithersburg, MD 20899 USA

[6] Argonne Natl Lab, Adv Photon Source, 9700 Cass Ave, Lemont, IL 60439 USA

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 10期

关键词：

X-RAY; DYNAMICS; NANOCOMPOSITES; RHEOLOGY; SHEAR; VISCOELASTICITY; SCATTERING;

D O I：

10.1103/PhysRevLett.122.107802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 Levy 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.

引用

页数：6

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