Mercury Porosimetry For Porous Structures – PASCALL Porosimeter

The mercury porosimetry technique is one of the most useful methods to investigate the porous structure of solid samples in a quantitative way. It provides reliable information about pore size/volume distribution, particle size distribution, bulk (envelope) density and specific surface for most porous solids.Porosimeter

Pressurization by Automatic Speed-up and Continuous Adjustment Logic, or, in short Pascal, is a special operating principle developed by Thermo Fisher Scientific and used in the new generation of automatic mercury porosimeters the Pascal Range, which reduces run times by up to 30%. Providing fast automated measurements with selectable intrusion/extrusion speed rates to minimise hysteresis effects, the PASCAL range provides maximum resolution in minimum time. 

Mercury porosimetry analysis is based on the measure of the intrusion of mercury into the pores of the sample at various pressures. In principle it is impossible to know which pressure rate is the most suitable for the sample as the pore size range and pore shape in different solid samples are unknown. An excessively high pressurization rate gives wrong results because the pores are not completely filled at the corresponding pressure, whereas a low pressurization rate wastes valuable laboratory time. The solution is Pascal.

Nine different speed characteristics are available covering different application fields. When mercury intrusion is detected by the mercury level detector, the pressurization immediately slows down without stopping completely. The acceleration and deceleration of the pumping system are balanced to assure a constant pressure over the sample during the mercury intrusion into the pores with the same access size, thus providing proper equilibrium time

The Pascal method automatically determines the correct pressurization speed according to the presence of pores and to the actual mercury penetration rate thereby eliminating dead times during the analysis. This operation is performed at any pressure. The Pascal method combines all the benefits in one system:

Optimum information quality at every speed and at every pressure

Highest resolution

Minimum analysis time

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