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Title: The tracer diffusion coefficient of soft nanoparticles in a linear polymer matrix

The diffusion properties of nanoparticles in polymer nanocomposites are largely unknown and are often difficult to determine experimentally. To address this shortcoming, we have developed a novel method to determine the tracer diffusion coefficient of soft polystyrene nanoparticles in a linear polystyrene matrix. Monitoring the interdiffusion of soft nanoparticles into a linear polystyrene matrix provides the mutual diffusion coefficient of this system, from which the tracer diffusion coefficient of the soft nanoparticle can be determined using the slow mode theory. Utilizing this protocol, the role of nanoparticle molecular weight and rigidity on its tracer diffusion coefficient is provided. These results demonstrate that the diffusive behavior of these soft nanoparticles differ from that of star polymers, which is surprising since our recent studies suggest that the nanoparticle interacts with a linear polymer similarly to that of a star polymer. It appears that these deformable nanoparticles mostly closely mimic the diffusive behavior of fractal macromolecular architectures or microgels, where the transport of the nanoparticle relies on the cooperative motion of neighboring linear chains. Finally, the less cross-linked, and thus more deformable, nanoparticles diffuse faster than the more highly crosslinked nanoparticles, presumably because the increased deformability allows the nanoparticle to distort and fitmore » into available space.« less
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [3] ; ORCiD logo [3]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
  3. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
RSC Advances
Additional Journal Information:
Journal Volume: 7; Journal Issue: 25; Journal ID: ISSN 2046-2069
Publisher:
Royal Society of Chemistry
Research Org:
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1352804

Imel, Adam E., Rostom, Sahar, Holley, Wade, Baskaran, Durairaj, Mays, J. W., and Dadmun, Mark D.. The tracer diffusion coefficient of soft nanoparticles in a linear polymer matrix. United States: N. p., Web. doi:10.1039/C7RA00871F.
Imel, Adam E., Rostom, Sahar, Holley, Wade, Baskaran, Durairaj, Mays, J. W., & Dadmun, Mark D.. The tracer diffusion coefficient of soft nanoparticles in a linear polymer matrix. United States. doi:10.1039/C7RA00871F.
Imel, Adam E., Rostom, Sahar, Holley, Wade, Baskaran, Durairaj, Mays, J. W., and Dadmun, Mark D.. 2017. "The tracer diffusion coefficient of soft nanoparticles in a linear polymer matrix". United States. doi:10.1039/C7RA00871F. https://www.osti.gov/servlets/purl/1352804.
@article{osti_1352804,
title = {The tracer diffusion coefficient of soft nanoparticles in a linear polymer matrix},
author = {Imel, Adam E. and Rostom, Sahar and Holley, Wade and Baskaran, Durairaj and Mays, J. W. and Dadmun, Mark D.},
abstractNote = {The diffusion properties of nanoparticles in polymer nanocomposites are largely unknown and are often difficult to determine experimentally. To address this shortcoming, we have developed a novel method to determine the tracer diffusion coefficient of soft polystyrene nanoparticles in a linear polystyrene matrix. Monitoring the interdiffusion of soft nanoparticles into a linear polystyrene matrix provides the mutual diffusion coefficient of this system, from which the tracer diffusion coefficient of the soft nanoparticle can be determined using the slow mode theory. Utilizing this protocol, the role of nanoparticle molecular weight and rigidity on its tracer diffusion coefficient is provided. These results demonstrate that the diffusive behavior of these soft nanoparticles differ from that of star polymers, which is surprising since our recent studies suggest that the nanoparticle interacts with a linear polymer similarly to that of a star polymer. It appears that these deformable nanoparticles mostly closely mimic the diffusive behavior of fractal macromolecular architectures or microgels, where the transport of the nanoparticle relies on the cooperative motion of neighboring linear chains. Finally, the less cross-linked, and thus more deformable, nanoparticles diffuse faster than the more highly crosslinked nanoparticles, presumably because the increased deformability allows the nanoparticle to distort and fit into available space.},
doi = {10.1039/C7RA00871F},
journal = {RSC Advances},
number = 25,
volume = 7,
place = {United States},
year = {2017},
month = {3}
}