Hyperdiffusive Dynamics in Newtonian Nanoparticle Fluids

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• 作者：Samanvaya Srivastava ; Praveen Agarwal ; Rahul Mangal ; Donald L. Koch ; Suresh Narayanan ; Lynden A. Archer
• 刊名：ACS Macro Letters
• 出版年：2015
• 出版时间：October 20, 2015
• 年：2015
• 卷：4
• 期：10
• 页码：1149-1153
• 全文大小：391K
• ISSN：2161-1653

文摘

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.