TY - JOUR
T1 - Morphology and Gas Adsorption Properties of Palladium - Cobalt-Based Cyanogels
AU - Deshpande, Rahul S.
AU - Sharp-Goldman, Stefanie L.
AU - Willson, Jennifer L.
AU - Bocarsly, Andrew Bruce
AU - Gross, Joachim
AU - Finnefrock, Adam C.
AU - Gruner, Sol M.
PY - 2003/11/4
Y1 - 2003/11/4
N2 - The morphology of cyanide-bridged palladium-cobalt (Pd-Co) gels, synthesized from aqueous solutions of Na2PdCl4 and K 3[Co(CN)6], is elucidated using nitrogen and carbon dioxide adsorption, permeability measurements, electron microscopy, and small-angle X-ray scattering. The aerogels formed from the Pd-Co hydrogels possess both micro- and mesoporosity. Electron microscopy indicates that the aerogels are constituted of spherical microporous particles; the interstices between these particles constitute the mesopores. The aerogel surfaces are found to be fractal as analyzed by gas adsorption and small-angle X-ray scattering. Both these techniques yield, within experimental error, the same surface fractal dimension of 2.6 ± 0.2 for the aerogels. The Pd-Co xerogels, unlike the aerogels, are predominantly microporous with a narrow microporosity. Transmission electron microscopy reveals that the xerogels are constituted of particles of an average size of ∼10 nm. Unlike the aerogels, the xerogels do not possess surface fractality. The mechanism of adsorption of different gases on these gels is analyzed on the basis of the gel morphologies.
AB - The morphology of cyanide-bridged palladium-cobalt (Pd-Co) gels, synthesized from aqueous solutions of Na2PdCl4 and K 3[Co(CN)6], is elucidated using nitrogen and carbon dioxide adsorption, permeability measurements, electron microscopy, and small-angle X-ray scattering. The aerogels formed from the Pd-Co hydrogels possess both micro- and mesoporosity. Electron microscopy indicates that the aerogels are constituted of spherical microporous particles; the interstices between these particles constitute the mesopores. The aerogel surfaces are found to be fractal as analyzed by gas adsorption and small-angle X-ray scattering. Both these techniques yield, within experimental error, the same surface fractal dimension of 2.6 ± 0.2 for the aerogels. The Pd-Co xerogels, unlike the aerogels, are predominantly microporous with a narrow microporosity. Transmission electron microscopy reveals that the xerogels are constituted of particles of an average size of ∼10 nm. Unlike the aerogels, the xerogels do not possess surface fractality. The mechanism of adsorption of different gases on these gels is analyzed on the basis of the gel morphologies.
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U2 - 10.1021/cm034216m
DO - 10.1021/cm034216m
M3 - Article
AN - SCOPUS:0242626161
SN - 0897-4756
VL - 15
SP - 4239
EP - 4246
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 22
ER -