Hyperdiffusive Dynamics in Newtonian Nanoparticle Fluids

Srivastava, Samanvaya; Agarwal, Praveen; Mangal, Rahul; Koch, Donald L.; Narayanan, Suresh; Archer, Lynden A.

Hyperdiffusive Dynamics in Newtonian Nanoparticle Fluids

Type

Article

Authors

Srivastava, Samanvaya
Agarwal, Praveen
Mangal, Rahul
Koch, Donald L.
Narayanan, Suresh
Archer, Lynden A.

KAUST Grant Number

KUS-C1018-02

Online Publication Date

2015-09-24

Print Publication Date

2015-10-20

Date

2015-09-24

Abstract

© 2015 American Chemical Society. Hyperdiffusive relaxations in soft glassy materials are typically associated with out-of-equilibrium states, and nonequilibrium physics and aging are often invoked in explaining their origins. Here, we report on hyperdiffusive motion in model soft materials comprised of single-component polymer-tethered nanoparticles, which exhibit a readily accessible Newtonian flow regime. In these materials, polymer-mediated interactions lead to strong nanoparticle correlations, hyperdiffusive relaxations, and unusual variations of properties with temperature. We propose that hyperdiffusive relaxations in such materials can arise naturally from nonequilibrium or non-Brownian volume fluctuations forced by equilibrium thermal rearrangements of the particle pair orientations corresponding to equilibrated shear modes.

Citation

Srivastava S, Agarwal P, Mangal R, Koch DL, Narayanan S, et al. (2015) Hyperdiffusive Dynamics in Newtonian Nanoparticle Fluids. ACS Macro Letters 4: 1149–1153. Available: http://dx.doi.org/10.1021/acsmacrolett.5b00319.

Acknowledgements

This work was supported by the National Science Foundation Award No. DMR-1006323 and by Award No. KUS-C1018-02, made by King Abdullah University of Science and Technology (KAUST). Use of the Advanced Photon Source, operated by Argonne National Laboratory, was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357.