A novel method for estimating the C-values of the BET equation in the whole range 0&lt;P/Po&lt;1 using a Scatchard-type treatment of it

Pomonis, P.J.; Petrakis, Dimitrios; Ladavos, Athanasios; Kolonia, K.M; Armatas, Gerasimos S.; Sklari, S.D.; Dragani, P.C; Zarlaha, A.; Stathopoulos, Vassilis N.; Sdoukos, Antonios T.

doi:10.1016/j.micromeso.2004.01.009

Cited by 35 publications

(40 citation statements)

References 20 publications

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“…Similar heat of adsorption has been reported for transition metal MCM-Al type mesoporous phases [37]. Mesoporous MCM-Si has lower heat of adsorption $1.8 kJ/mol [37]. These results suggest different interaction of nitrogen with the gallium oxide framework than that Table 1 General synthesis conditions and textural properties of mesoporous nanocrystalline gallium oxide phases calcined at 350°C via self-assembly microwave-assisted heating.…”

Section: Resultssupporting

confidence: 66%

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Microwave-assisted synthesis of nanocrystalline mesoporous gallium oxide

Deshmane

Jasiński

Carreón

2010

Microporous and Mesoporous Materials

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Section: Resultssupporting

confidence: 66%

“…The C constants of the BET equation range from $41 to 71, and correspond to net heat of adsorption of 2.3-2.7 kJ/mol [33]. Similar heat of adsorption has been reported for transition metal MCM-Al type mesoporous phases [37]. Mesoporous MCM-Si has lower heat of adsorption $1.8 kJ/mol [37].…”

Section: Resultsmentioning

confidence: 80%

Microwave-assisted synthesis of nanocrystalline mesoporous gallium oxide

Deshmane

Jasiński

Carreón

2010

Microporous and Mesoporous Materials

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“…The polyacrylamide xerogel revealed strange nitrogen adsorption-desorption isotherms where the adsorbed volume of nitrogen is found to be perfectly linear over the whole P/P 0 range, with the adsorption and desorption behaviors being identical. This uncommon behavior coupled with the small value of the BET constant (C=2.5) indicates very weak adsorbateadsorbent interactions where the heat of adsorption of nitrogen in the first layer is slightly higher than the heat of condensation of the adsorbate in the pores [49]. Thus the nitrogen fills the pores of the polyacrylamide xerogel by condensation instead of being adsorbed layer by layer on the surface.…”

Section: Nitrogen Adsorptionmentioning

confidence: 99%

Synthesis and Characterization of Mesoporous Hybrid Silica-Polyacrylamide Aerogels and Xerogels

Ramadan

Coradin

Masse

et al. 2010

Silicon

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We report the synthesis of highly porous hybrid silica-polyacrylamide aerogels where the inorganic network was obtained through the hydrolysis and poly-condensation of tetramethoxysilane via a two-step sol-gel process while the polyacrylamide polymer was made by photocopolymerization of two organic monomers, the acrylamide and the bis-acrylamide. These aerogels were obtained after a carbon dioxide supercritical drying while the corresponding xerogels were dried by simple evaporation. These materials, as well as pure silica and polyacrylamide aerogels and xerogels, were characterized by FTIR spectroscopy, solid-state 29 Si and 13 C NMR spectroscopy, Thermogravimetric Analysis, a nitrogen adsorptiondesorption technique, and Scanning Electron Microscopy. The FTIR and NMR spectra and the TGA/DTA analyses confirm the coexistence of highly branched silica and polyacrylamide networks reflecting the hybrid nature of the materials obtained. Nitrogen adsorption measurements reveal high specific surface areas and pore size distributions disclosing the mesoporous character of these hybrid materials. Hybrid silica-polyacrylamide aerogels having a specific surface area equal to 572 m 2 /g and a pore volume 1.92 cm 3 /g were successfully prepared for the first time in this study. The high porosity of these aerogels is due to a better resistance of the silica network to capillary forces during the supercritical drying when silica coexists with a polyacrylamide network.

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“…The surface area is generally determined from the equilibrium adsorption isotherm of a gas measured in a range of relative pressures from 0.01 to 0.3. Currently two major methods are generally used to evaluate specific surface area from gas adsorption data: the Brunauer-Emmett-Teller (BET) method [98][99][100][101] and the I-point method, 102 which was proposed to overcome a limitation of the BET method. The recently proposed Freundlich specific surface area 103 is an enlargement of the specific surface area determined by the BET method.…”

Section: Specific Surface Area Determinationmentioning

confidence: 99%