ABSTRACT
There are several independent methods for determining pore statistics or pore size distributions. The most useful and common are presented here. In particular: Electron and atomic force microscopy techniques and computerized image analysis, gas-liquid and liquid-liquid displacement methods, mercury porosimetry, adsorption-desorption techniques, permporometry, thermoporometry and solute retention methods. For all these methods some examples are shown in this chapter. The different methods are described and the physical principles, operative conditions and mathematical procedures shown in some detail here. While other less developed methods are also mentioned. These methods are shown to cover complementary ranges and different characteristics linked with structure and permeation in porous membranes used in micro-, ultraand nanofiltration as well as other porous materials. The value and drawbacks of each method are discussed and compared for very regular track-etched membranes. The effect of pore size distribution on electrokinetic parameters, focusing on streaming potential, is also shown.
