4.7 Article

Slow dynamics of nanocomposite polymer aerogels as revealed by X-ray photocorrelation spectroscopy (XPCS)

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JOURNAL OF CHEMICAL PHYSICS
卷 140, 期 2, 页码 -

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AMER INST PHYSICS
DOI: 10.1063/1.4861043

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  1. Fundacion Domingo Martinez
  2. L'Oreal-Unesco fellowship FWIS and of MEC [MAT2012-33517, MAT2011-23455, MAT2011-24797]

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We report on a novel slow dynamics of polymer xerogels, aerogels, and nanocomposite aerogels with iron oxide nanoparticles, as revealed by X-ray photon correlation spectroscopy. The polymer aerogel and its nanocomposite aerogels, which are porous in nature, exhibit hyper-diffusive dynamics at room temperature. In contrast, non-porous polymer xerogels exhibit an absence of this peculiar dynamics. This slow dynamical process has been assigned to a relaxation of the characteristic porous structure of these materials and not to the presence of nanoparticles. (C) 2014 AIP Publishing LLC.

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