Pore Analysis
Pore Analysis Services
Gas Adsorption Technique
Once details of the isotherm curve are accurately expressed as a series of pressure vs. quantity adsorbed data pairs, a number of different methods (theories or models) can be applied to determine the pore size distribution. Available micropore methods include: Density Functional Theory (DFT), MP-Method, Dubinin Plots (Dubinin-Radushkevich D-R, Dubinin-Astakov D-A), and Horvath-Kawazoe (H-K) calculations. Available Mesopore methods include: Barrett, Joyner and Halenda method (BJH), and Density Functional Theory (DFT). T-Plot analysis is also available for total micropore area as well.


Mercury Intrusion Technique
As mercury is forced to enter pores within the sample material, it is depleted from a capillary stem reservoir connected to the sample cup. The incremental volume depleted after each pressure change is determined by measuring the change in capacitance of the stem. This intrusion volume is recorded with the corresponding pressure or pore size.
NOTE: The maximum pore size that any mercury porosimeter can characterize depends on a number of factors. The primary limiting factors are 1) the contact angle between mercury and the sample material, and 2) the head pressure gradient associated with a volume of mercury and the volume of sample material subjected to these pressures.
Capillary Flow Technique
With this method, pore properties are calculated by measuring the fluid flow when an inert, pressurized gas is applied to displace an inert and nontoxic wetting fluid impregnated in the porous network of the sample.
Parameters such as first bubble point (corresponding to the largest pores present) can be calculated with accuracy and repeatability according to ASTM F316.


Liquid-Liquid Displacement Technique
Using this method, we can measure nanopores (1,000 to 2 nm) at low pressures by displacing the wetting liquid with an immiscible liquid at increasing pressure. This eliminates error from collapse or mechanical damage caused by high pressure when measuring materials such as hollow fibers.