Gas Liquid Porometry (GLP) can be applied to the characterisation of polymeric and ceramic membranes for micro and ultra-filtration applications with pore sizes ranging from 500 μm down to 15 nm. Flat sheet, tubular and hollow fibres can be measured by using an appropriate sample holder. The figure on the right shows the wet, dry and half dry curves of a full porometry test of a flat sheet commercial polymeric membrane used in water treatment.
GLP measurements of melt blown and spun bound materials, were carried out by using a POROLUX™ 100NW porometer. The POROLUX™ 100NW is specially designed for nonwoven characterisation and it is based on the pressure scan method. The method is fast and typically generates very reproducible results, which makes the POROLUX™ 100NW very suited for quality control.
The POROLUX™ 100 has been optimised for the pressure range between 1-5 bar (0.64 μm-0.128 μm) and it is specially indicated for paper testing. Different paper types (printing paper, cigarette, etc.) have been characterised with a POROLUX™ 100.
The characterisation of hollow bre membranes by capillary ow porometry can be challenging, given the fact that the samples might burst or collapse under pressure. The POROLUX™ 1000 has an specially designed Sample Holder for Hollow Fibres (SHHF) which permits attaching the hollow bres in two di erent ways, depending on the direction of the gas ow (inside-out or outside-in). The bottom connector parts with di erent bore diameters are available, for measuring is possible to measure bres of variable diameter.
The structure and properties of the separator are very important because they affect the battery performance (energy and power density, cycle life and safety) to great extent. Therefore, an accurate characterisation of the pore size distribution and the permeability of the separator is fundamental to understand how it works and to identify routes of improvement. This is how our POROLUX™ 1000 porometer can help.
GLP has proven to be a promising and environmentally friendly alternative to mercury injection porosimetry for petrophysics applications. It permits obtaining several parameters and information with good accuracy and reproducibility in one individual and fast measurement, reducing the measuring time from several hours to minutes. The POROLUX™ 1000 has been used successfully to measure flow relevant parameters of cretaceous sandstones.