Open AccessHyperdiffusive Dynamics in Newtonian Nanoparticle Fluids
Author(s) -
Samanvaya Srivastava,
Praveen Agarwal,
Rahul Mangal,
Donald L. Koch,
Suresh Narayanan,
Lynden A. Archer
Publication year - 2015
Publication title -
acs macro letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.966
H-Index - 92
ISSN - 2161-1653
DOI - 10.1021/acsmacrolett.5b00319
Subject(s) - non equilibrium thermodynamics , brownian motion , polymer , brownian dynamics , nanoparticle , materials science , soft matter , newtonian fluid , non newtonian fluid , rheology , soft materials , particle (ecology) , thermal , shear flow , shear (geology) , chemical physics , thermodynamics , nanotechnology , physics , colloid , chemistry , composite material , oceanography , quantum mechanics , geology
© 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
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