Showing results 201 to 220 of 264
 Caractérisation de matériaux poreux par analyse d'images 3DBlacher, Silvia  ; Gommes, Cédric ; Léonard, Angélique et alConference (2006, February) Detailed reference viewed: 38 (5 ULg) Synthesis optimization of organic xerogels produced from convective air-drying of resorcinol-formaldehyde gelsJob, Nathalie ; ; Marien, José et alin Journal of Non-Crystalline Solids (2006), 352(1), 24-34 Resorcinol-formaldehyde gels were produced at 50, 70 and 90 degrees C and with three different R/C ratios (500, 1000 and 2000). The effect of these variables combined with that of aging time was studied ... [more ▼] Resorcinol-formaldehyde gels were produced at 50, 70 and 90 degrees C and with three different R/C ratios (500, 1000 and 2000). The effect of these variables combined with that of aging time was studied in order to optimize the synthesis conditions. The convective air-drying process was used, and the drying duration was studied with regard to the synthesis conditions. The aging time has no effect on the pore texture after 24 h at 90 degrees C or 48 h at 70 C, whatever the R/C value. The synthesis-aging step can be shortened by increasing the temperature. Nevertheless, the pore size tends then to decrease, especially when R/C is high, but this can be counterbalanced by increasing R/C. Moreover, bubbles often appear in the gel at high synthesis temperature, which limits the temperature to about 70 degrees C in the case of monolithic parts. At 70 degrees C and with an air velocity of 2 m/s, the elimination of 90% of the solvent requires 1 h drying when the pore size reaches 400-600 nm, 2.5 h for 50 nm wide pores and 3 h when the pore size decreases to 15-20 nm. The drying duration does not exceed 8 h in all cases and could be shortened by increasing the temperature at the end of the process. (c) 2005 Elsevier B.V. All rights reserved. [less ▲] Detailed reference viewed: 30 (1 ULg)Use of x-ray microtomography to visualise dynamic adsorption of organic vapour and water vapour on activated carbon; Blacher, Silvia ; Léonard, Angélique in Adsorption (2006), 12(1), 19-26 X-ray microtomography coupled with image analysis was used to quantify the adsorption of vapours on activated carbon beds. This technique was tested using three different challenges: CCl4, water vapour ... [more ▼] X-ray microtomography coupled with image analysis was used to quantify the adsorption of vapours on activated carbon beds. This technique was tested using three different challenges: CCl4, water vapour and a mixture of water- and organic vapour. It is shown that the used technique allows determining the adsorption front progress in the case of organic vapour and mixture of water and organic vapour whereas the existence of this front was not so obvious in the case of water vapour. Experimental results obtained for organic vapours were interpreted on the basis of the Wheeler-Jonas equation: a good agreement was found between experimental and theoretical breakthrough times. [less ▲] Detailed reference viewed: 56 (14 ULg) Metal catalysts suppported on texture-tailored carbon xerogelsJob, Nathalie ; Léonard, Angélique ; et alin Studies in Surface Science and Catalysis (2006), 162 Detailed reference viewed: 46 (4 ULg)Avoiding mass transfer limitations in carbon supported catalysis by using carbon xerogel as supportsJob, Nathalie ; Heinrichs, Benoît ; Léonard, Angélique et alin Chemistry for Sustainable Development (2006), 14 Detailed reference viewed: 16 (4 ULg)The porous structure of biodegradable scaffolds obtained with supercritical CO2 as foaming agentBlacher, Silvia ; Calberg, Cédric ; et alin Studies in Surface Science and Catalysis (2006), 160 Detailed reference viewed: 7 (2 ULg)Élimination des limitations de transfert de matière en catalyse supportée sur carbone par utilisation de supports de type xérogel de carboneJob, Nathalie ; Heinrichs, Benoît ; Léonard, Angélique et alConference (2006) Detailed reference viewed: 12 (0 ULg)Metal catalysts supported on texture tailored carbon xerogelsJob, Nathalie ; Léonard, Angélique ; Pirard, René et alConference (2006) Detailed reference viewed: 20 (4 ULg)Avoiding mass transfer limitations in carbon supported catalysis by using carbon xerogel type supportsJob, Nathalie ; Heinrichs, Benoît ; Léonard, Angélique et alConference (2006) Detailed reference viewed: 13 (0 ULg)Production de xérogels de carbone hyperporeux par séchage convectifLéonard, Angélique ; Job, Nathalie ; et alin Azzaro-Pantel, Catherine; Bertrand, Joel; Cabassub, Michel (Eds.) et al Récents progrès en génie des procédés N° 92: 10ème Congrès de la SFGP, Toulouse 2005. Le génie des procédés vers de nouveaux espaces (2005, October) Detailed reference viewed: 29 (2 ULg)Towards the production of carbon xerogel monoliths by optimizing convective drying conditionsLéonard, Angélique ; ; Job, Nathalie et alPoster (2005, October) Detailed reference viewed: 28 (10 ULg)High-resolution X-ray microtomography to determine the kinetics of water vapour adsorption; Léonard, Angélique ; Blacher, Silvia Conference (2005, October) Detailed reference viewed: 15 (0 ULg)X-ray microtomography coupled with image analysis: a useful tool or 3D characterization of polymer foamsBlacher, Silvia ; ; Calberg, Cédric et alConference (2005, October) Detailed reference viewed: 37 (4 ULg)Analyse quantitative de la texture poreuse d'un matériau polymère cellulaire basée sur des images de microtomographie à rayons X; Toye, Dominique ; et alPoster (2005, October) Detailed reference viewed: 15 (0 ULg)Étude de la texture poreuse d'un matériau polymère cellulaire utilisé en ingénierie tissulaire par microtomographie à rayons X; Toye, Dominique ; et alPoster (2005, October) Detailed reference viewed: 33 (6 ULg)Production de xérogels de carbone hyperporeux par séchage convectifLéonard, Angélique ; Job, Nathalie ; et alPoster (2005, September 20) Detailed reference viewed: 3 (0 ULg)Texture characterisation of ultramacroporous materials using x-ray microtomography: application to alumina foams and deer antlersLéonard, Angélique ; Blacher, Silvia ; et alConference (2005, September) Detailed reference viewed: 29 (3 ULg)Textural comparison of resorcinol-formaldehyde xerogels obtained by vacuum drying and convective dryingLéonard, Angélique ; Job, Nathalie ; et alPoster (2005, July 10) Detailed reference viewed: 3 (1 ULg)Textural comparison of resorcinol-formaldehyde xerogels obtained by vacuum drying and convective dryingLéonard, Angélique ; Job, Nathalie ; et alPoster (2005, July) Detailed reference viewed: 12 (1 ULg)Suitability of convective air drying for the production of porous resorcinol-formaldehyde and carbon xerogelsLéonard, Angélique ; Job, Nathalie ; Blacher, Silvia et alin Carbon (2005), 43(8), 1808-1811 Detailed reference viewed: 37 (2 ULg) |
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