Porosimetry

Delta Analytical Instruments, Inc.
1061 Main Street
North Huntingdon, PA 15642
USA

Tel : (724) 864-9850
Fax : (724) 864-9851

NITROGEN POROSIMETRY:

INSTRUMENTATION:

Micromeritics ASAP 2000, ASAP 2010, and ASAP 2400 analyzers determine pore information by condensing nitrogen in the pores of a material and then calculating the pore volumes from the quantities of gas required to fill the pores. Analyses are usually performed in conjunction with surface area analysis. For porosimetry analyses, the instrument doesn't stop with the first adsorbed layer of gas that is needed for surface area determination. Instead, the instrument continues to fill the sample with gas until bulk condensation begins.

RESULTS:

A typical report consists of an adsorb/desorb isotherm, tabular data, and graphs illustrating pore values.

MERCURY POROSIMETRY:

INSTRUMENTATION:

The Micromeritics Autopore IV 9500 measures pore diameters in the 0.003 um - 360 um range.  This method of structure analysis is faster than nitrogen porosimetry.  Since this analysis requires pressures of a maximum of 60,000 psia and uses mercury, not all materials can be analyzed by this method. With mercury porosimetry, pore information is obtained by forcing liquid mercury into pores by increasing the external pressure. As the pressure is incrementally increased, the amount of mercury required to fill the pores is recorded. This information, as well as information concerning the contact angle, is used to calculate the pore structures.

RESULTS:

Pore area and pore volume graphs, as well as, bulk density, skeletal density, and porosity values are all reported.