The PMI Liquid-Liquid Porometer is designed for pore structure characterization of materials such as membranes, filter media, ceramics, paper, textile, etc., having very small pore sizes. It is capable of measuring pore diameters, pore distribution and liquid flow rates of materials having very low permeability.
Two immiscible & saturated wetting liquids such as silwick and alcohol are taken. Pores are filled with silwick and alcohol is pressurized to displace the silwick and flow through the pores. The amount of liquid flowing out is measured in balance. Alcohol flow rate and differential pressure are measured. Because surface tension of silwick and alcohol are low, contact angles are taken as zero. Mean flow pore diameter and pore distribution are computed like CFP.
Unique Measurable Characteristics
Unique characteristics of the PMI Liquid-Liquid Porometer include:
- Pore diameters down to several nanometers are measurable
- Pressures needed are much less than those for Capillary Flow Porometer
- Very low liquid permeability measured
- Fully automated, user friendly operation