The POROLIQ™ 1000 is
a Liquid-Liquid Porometer (LLP). This rapid, precise method employed by the POROLIQ™ 1000 allows for testing of pore size down to 2nm and, compared to other techniques, uses lower pressures for characterization of traditional micro-, Nano-porous materials.
It is the first LLP equipment based on a pressure driven concept, which guarantees the maximum accuracy, especially when measuring pore sizes in the submicron range.
A measurement consists first of complete saturation of the porous membrane with a wetting liquid. The subsequent displacement of the wetting liquid from the pores is achieved by a second, immiscible liquid (displacement liquid). The pressure (P) required to expel the wetting liquid out of the pore depends on its diameter (D) as expressed by the Young-Laplace equation P=4*γ*cos θ/D , where γ is the interfacial tension between the wetting and displacement liquid.
Typical interfacial tension values lie between 0.35 and 4 mN/m. This allows pores as small as 2 nm to be probed or, in comparison to traditional gas liquid porometry, for the use of more moderate pressures to test traditional submicron pore size ranges.
By measuring the flow rate of liquid through the sample, a complete pore size distribution can be obtained.