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

Journal Article · Tue Jan 14 00:00:00 EST 2014 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4861043· OSTI ID:22254170

Hernández, Rebeca; Mijangos, Carmen ^[1]; Nogales, Aurora; Ezquerra, Tiberio A. ^[2]; Sprung, Michael ^[3]

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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)

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.

• OSTI ID: 22254170
• Journal Information: Journal of Chemical Physics, Vol. 140, Issue 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
77 NANOSCIENCE AND NANOTECHNOLOGY
GELS
IRON OXIDES
NANOSTRUCTURES
PARTICLES
PHOTONS
POLYMERS
POROUS MATERIALS
RELAXATION
SPECTROSCOPY
X RADIATION