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Title: Hyperdiffusive dynamics in Newtonian nanoparticle fluids [Hyperdiffusive dynamics in equilibrated nanoparticle fluids]

Hyperdiffusive relaxations in soft glassy materials are typically associated with out-of-equilibrium states, and non-equilibrium physics and aging are often invoked in explaining their origins. Here, we report on hyperdiffusive motion in a model, equilibrium soft material comprised of single-component polymer-tethered-nanoparticles. In these materials, polymer mediated interactions lead to strong nanoparticle correlations, hyperdiffusive relaxations, and unusual variations of properties with temperature. Our experimental observations complement the current hypothesis that hyperdiffusive relaxations in soft materials require the material to exist in out–of–equilibrium states capable of driving structural rearrangements. Lastly, we propose alternatively that hyperdiffusive relaxations in our materials can arise naturally from volume fluctuations brought about by equilibrium thermal forces.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Cornell Univ., Ithaca, NY (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
ACS Macro Letters
Additional Journal Information:
Journal Volume: 4; Journal Issue: 10; Journal ID: ISSN 2161-1653
Publisher:
American Chemical Society (ACS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
National Science Foundation (NSF); USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1342385

Srivastava, Samanvaya, Agarwal, Praveen, Mangal, Rahul, Koch, Donald L., Narayanan, Suresh, and Archer, Lynden A.. Hyperdiffusive dynamics in Newtonian nanoparticle fluids [Hyperdiffusive dynamics in equilibrated nanoparticle fluids]. United States: N. p., Web. doi:10.1021/acsmacrolett.5b00319.
Srivastava, Samanvaya, Agarwal, Praveen, Mangal, Rahul, Koch, Donald L., Narayanan, Suresh, & Archer, Lynden A.. Hyperdiffusive dynamics in Newtonian nanoparticle fluids [Hyperdiffusive dynamics in equilibrated nanoparticle fluids]. United States. doi:10.1021/acsmacrolett.5b00319.
Srivastava, Samanvaya, Agarwal, Praveen, Mangal, Rahul, Koch, Donald L., Narayanan, Suresh, and Archer, Lynden A.. 2015. "Hyperdiffusive dynamics in Newtonian nanoparticle fluids [Hyperdiffusive dynamics in equilibrated nanoparticle fluids]". United States. doi:10.1021/acsmacrolett.5b00319. https://www.osti.gov/servlets/purl/1342385.
@article{osti_1342385,
title = {Hyperdiffusive dynamics in Newtonian nanoparticle fluids [Hyperdiffusive dynamics in equilibrated nanoparticle fluids]},
author = {Srivastava, Samanvaya and Agarwal, Praveen and Mangal, Rahul and Koch, Donald L. and Narayanan, Suresh and Archer, Lynden A.},
abstractNote = {Hyperdiffusive relaxations in soft glassy materials are typically associated with out-of-equilibrium states, and non-equilibrium physics and aging are often invoked in explaining their origins. Here, we report on hyperdiffusive motion in a model, equilibrium soft material comprised of single-component polymer-tethered-nanoparticles. In these materials, polymer mediated interactions lead to strong nanoparticle correlations, hyperdiffusive relaxations, and unusual variations of properties with temperature. Our experimental observations complement the current hypothesis that hyperdiffusive relaxations in soft materials require the material to exist in out–of–equilibrium states capable of driving structural rearrangements. Lastly, we propose alternatively that hyperdiffusive relaxations in our materials can arise naturally from volume fluctuations brought about by equilibrium thermal forces.},
doi = {10.1021/acsmacrolett.5b00319},
journal = {ACS Macro Letters},
number = 10,
volume = 4,
place = {United States},
year = {2015},
month = {9}
}