

FOLLOWUS
a.State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
b.Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, China
tianm@mail.buct.edu.cn (M.T.)
mijg@mail.buct.edu.cn (J.G.M.)
Received:24 December 2018,
Revised:2019-1-27,
Accepted:31 January 2019,
Online First:12 March 2019,
Published:2019-07
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Citation: Ye, Y.; Qin, H.; Tian, M.; Mi, J. G. Diffusion mode transition between Gaussian and non-Gaussian of nanoparticles in polymer solutions. Chinese J. Polym. Sci. 2019, 37, 719–728
Yi Ye, Han Qin, Ming Tian, et al. Diffusion Mode Transition between Gaussian and Non-Gaussian of Nanoparticles in Polymer Solutions[J]. Chinese Journal of Polymer Science, 2019, 37(7): 719-728.
Citation: Ye, Y.; Qin, H.; Tian, M.; Mi, J. G. Diffusion mode transition between Gaussian and non-Gaussian of nanoparticles in polymer solutions. Chinese J. Polym. Sci. 2019, 37, 719–728 DOI: 10.1007/s10118-019-2237-9.
Yi Ye, Han Qin, Ming Tian, et al. Diffusion Mode Transition between Gaussian and Non-Gaussian of Nanoparticles in Polymer Solutions[J]. Chinese Journal of Polymer Science, 2019, 37(7): 719-728. DOI: 10.1007/s10118-019-2237-9.
The dynamic density functional theory is applied to study the diffusion of nanoparticles in polymer solutions
in which different diffusion modes have been identified by exploiting the density and free energy evolutions. Under the condition of low polymer concentration
diffusion is controlled by particle free motion with a normal Gaussian type. As the concentration increases
the non-Gaussian behavior can be observed when the particle size is comparable to the correlation length of polymer chain. Particles need to penetrate through a cage and overcome an entropic barrier
where the hopping and the model-coupling diffusion coexist. Further increase of polymer concentration can result in complete restriction of the particle by surrounding polymer segments. In this case
the non-Gaussian process fades away
and particle diffusion is controlled by Rouse dynamics of polymer chains with the generalized Gaussian characteristics.
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