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Non Intrusive Mercury Porosimetry: Pyrolysis of Resorcinol‐Formaldehyde Xerogels
Author(s) -
Job Nathalie,
Pirard René,
Pirard JeanPaul,
Alié Christelle
Publication year - 2006
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.200601011
Subject(s) - porosimetry , mercury intrusion porosimetry , porosity , mercury (programming language) , pyrolysis , mineralogy , resorcinol , chemistry , materials science , porous medium , chemical engineering , thermodynamics , composite material , organic chemistry , computer science , programming language , physics , engineering
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.