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

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.
Authors:
;  [1] ; ;  [2] ;  [3]
  1. Instituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC, Juan de la Cierva, 3, 28006 Madrid (Spain)
  2. Instituto de Estructura de la Materia, IEM-CSIC, Serrano 121, 28006 Madrid (Spain)
  3. Petra III at DESY, Notkestr. 85, 22607 Hamburg (Germany)
Publication Date:
OSTI Identifier:
22254170
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 140; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; GELS; IRON OXIDES; NANOSTRUCTURES; PARTICLES; PHOTONS; POLYMERS; POROUS MATERIALS; RELAXATION; SPECTROSCOPY; X RADIATION