ADVANCES IN PORE MORPHOLOGY CHARACTERIZATION FOR WATER TREATMENT MEMBRANES

摘要

A survey of pore size, pore size distribution and morphology characterization techniques of filtration membranes will bepresented. Most of the current available techniques can provide “bulk” pore properties in the filtration membranes onlyand could not provide “depth” profile of the pore properties and/or three-dimensional pore structure in the multilayerfiltration membranes. The presentation will be divided into two parts: in the first part, a brief review of the currentmethods for characterizing filtration membrane pore properties will be given; in the second part, some innovativemethods can give "depth profile" properties of pore and free volume in filtration membranes from micron-scale toangstrom will be introduced. Two of those innovative methods, nano-transmission x-ray microscope (NTXM) andposition annihilation lifetime spectroscopic (PALS) techniques will be illustrated thoroughly with examples ofmicrofiltration and nanofiltration membranes.