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Surface Area and Microporosity of Carbon Aerogels from Gas Adsorption and Small- and Wide-Angle X-ray Scattering Measurements

David Fairen‐JiménezUniversidad de GranadaFrancisco Carrasco-Marı́nDepartamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain, DRFMC/SPrAM/LEMOH, UMR 5819 CEA/CNRS/UJF, CEA Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France, Laboratoire de Thermodynamique et Physico-Chimie Métallurgique, UMR 5614 CNRS-UJF-INPG, Domaine Universitaire, 38402 Saint Martin d'Hères Cedex, France, and Laboratoire de Spectrométrie Physique, UMR 5588 CNRS-UJF, Domaine Universitaire, 38402 Saint Martin d'Hères Cedex, FranceD. DjuradoDepartamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain, DRFMC/SPrAM/LEMOH, UMR 5819 CEA/CNRS/UJF, CEA Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France, Laboratoire de Thermodynamique et Physico-Chimie Métallurgique, UMR 5614 CNRS-UJF-INPG, Domaine Universitaire, 38402 Saint Martin d'Hères Cedex, France, and Laboratoire de Spectrométrie Physique, UMR 5588 CNRS-UJF, Domaine Universitaire, 38402 Saint Martin d'Hères Cedex, FranceF. BleyDepartamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain, DRFMC/SPrAM/LEMOH, UMR 5819 CEA/CNRS/UJF, CEA Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France, Laboratoire de Thermodynamique et Physico-Chimie Métallurgique, UMR 5614 CNRS-UJF-INPG, Domaine Universitaire, 38402 Saint Martin d'Hères Cedex, France, and Laboratoire de Spectrométrie Physique, UMR 5588 CNRS-UJF, Domaine Universitaire, 38402 Saint Martin d'Hères Cedex, FranceFrançoise Ehrburger‐DolleDepartamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain, DRFMC/SPrAM/LEMOH, UMR 5819 CEA/CNRS/UJF, CEA Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France, Laboratoire de Thermodynamique et Physico-Chimie Métallurgique, UMR 5614 CNRS-UJF-INPG, Domaine Universitaire, 38402 Saint Martin d'Hères Cedex, France, and Laboratoire de Spectrométrie Physique, UMR 5588 CNRS-UJF, Domaine Universitaire, 38402 Saint Martin d'Hères Cedex, FranceCarlos Moreno‐CastillaDepartamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain, DRFMC/SPrAM/LEMOH, UMR 5819 CEA/CNRS/UJF, CEA Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France, Laboratoire de Thermodynamique et Physico-Chimie Métallurgique, UMR 5614 CNRS-UJF-INPG, Domaine Universitaire, 38402 Saint Martin d'Hères Cedex, France, and Laboratoire de Spectrométrie Physique, UMR 5588 CNRS-UJF, Domaine Universitaire, 38402 Saint Martin d'Hères Cedex, France

2006en

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Annotatsiya

A carbon aerogel was obtained by carbonization of an organic aerogel prepared by sol-gel polymerization of resorcinol and formaldehyde in water. The carbon aerogel was then CO(2) activated at 800 degrees C to increase its surface area and widen its microporosity. Evolution of these parameters was followed by gas adsorption and small- and wide-angle X-ray scattering (SAXS and WAXS, respectively) with contrast variation by using dry and wet (immersion in benzene and m-xylene) samples. For the original carbon aerogel, the surface area, S(SAXS), obtained by SAXS, is larger than that obtained by gas adsorption (S(ads)). The values become nearly the same as the degree of activation of the carbon aerogel increases. This feature is due to the widening of the narrow microporosity in the carbon aerogel as the degree of activation is increased. In addition, WAXS results show that the short-range spatial correlations into the assemblies of hydrocarbon molecules confined inside the micropores are different from those existing in the liquid phase.

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DOI: 10.1021/jp055992f

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