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Mercury intrusion curve high-pore-volume silica

Figure 2. Mercury intrusion curve of a typical high-pore-volume silica used in... Figure 2. Mercury intrusion curve of a typical high-pore-volume silica used in...
In a previous study [5], we showed that some materials, in particular the low density silica xerogels, exhibit a remarkable behavior when submitted to mercury porosimetry. At low pressure, the volume variation observed is entirely due to a crushing mechanism, generally irreversible with sometimes a weak elastic component. At high pressure, these xerogels are invaded by mercury which intrudes the pore network. The transition fi om the crushing mechanism to intrusion is sudden at a pressure Pi, characteristic of the material. This particular point can be easily located on the curve of cumulative volume versus logarithm of pressure by... [Pg.604]

High dispersive precipitated silica submitted to an increasing pressure in a mercury porosimeter shows successively a collapse mechanism of porous texture followed by a mechanism of mercury intrusion in the part of pore network which has resisted to the collapse. Such a behavior has been previously observed on low density xerogels and on some carbon black. Both mechanisms can be clearly distinguished by a sharp variation of slope of cumulative pore volume curve versus pressure. [Pg.610]


See other pages where Mercury intrusion curve high-pore-volume silica is mentioned: [Pg.336]    [Pg.607]   
See also in sourсe #XX -- [ Pg.344 , Pg.346 ]




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