Abstract
A new kind of synthetic membrane was designed that has the ability to adjust the pore diameter in a wide range of sizes (from 0.8 to 22.3 μm) just by changing the pH of the aqueous media where they are immersed; in this way changing the pH can externally control the pore size of these membranes. A non-linear mathematical model, based on the overlap of charged particles, was developed to explain the behavior of the adjustment of pore size when the pH was varied. This model fits correctly the oscillatory behavior of the pore size as a function of pH. It has been reported by us that a similar behavior was found when the external temperature is changed. It is then possible to design smart membranes which respond to external parameters like temperature or pH.