Hyperdiffusive Dynamics in Newtonian Nanoparticle Fluids

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

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


© 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.
Original languageEnglish (US)
Pages (from-to)1149-1153
Number of pages5
JournalACS Macro Letters
Issue number10
StatePublished - Sep 24 2015
Externally publishedYes


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