Reference : Non intrusive mercury porosimetry: Pyrolysis of resorcinol-formaldehyde xerogels
Scientific journals : Article
Engineering, computing & technology : Chemical engineering
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/25999
Non intrusive mercury porosimetry: Pyrolysis of resorcinol-formaldehyde xerogels
English
Job, Nathalie mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Pirard, René [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Pirard, Jean-Paul mailto [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Alié, Christelle mailto [Université de Liège - ULg > Département de chimie appliquée > Génie Chimique - Chimique Physique appliquée > >]
2006
Particle & Particle Systems Characterization
Wiley-V C H Verlag Gmbh
23
1
72-81
Yes
International
0934-0866
Weinheim
[en] carbon gels ; mercury porosimetry ; pore collapse ; shrinkage ; xerogels
[en] When submitted to mercury porosimetry, some materials are penetrated by mercury whereas others, among the most porous, are densified by the isostatic pressure. Notably, this is the case for materials whose structure is made of particles aggregated into filament-like clusters that are interconnected in a 3-D array. Indeed, that kind of material undergoes a volume variation due to hierarchical pore collapse. In the case of intrusion, the mercury porosimetry data are classically analyzed by the Washburn equation. In the case of hierarchical pore collapse, data can be correctly analyzed by the collapse model equation. Using an equation that does not correspond to the mechanism leads to large errors in the pore size distribution. Thus, an accurate data analysis requires prior determination of the mechanism leading to the volume variation recorded as a function of the pressure. The present work particularly examines the complex and unusual behavior of partially pyrolyzed resorcinol-formaldehyde gels when submitted to mercury porosimetry. The unusual behavior encountered complicates the mechanism identification and, therefore, the equation selection. However, the major part of the volume distribution as a function of the pore size can be determined with a good accuracy.
http://hdl.handle.net/2268/25999
10.1002/ppsc.200601011

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