Abstract
The surface morphology of various types of Nuclepore® track-etched membranes (with applications in the areas of micro- and ultrafiltration) has been investigated quantitatively. As experimental techniques scanning electron microscopy (SEM) and computerized image analysis (IA) have been employed. From the results it is inferred that, in these membranes, surface pore density is an acceptably controlled parameter; however, the presence of a considerable amount of multiple pores leads to true distributions of pore sizes and shapes which deviate from their nominal values. Porosity is reduced and is related to the relative quantity of multiple pores by a linear correlation. These findings suggest a strong dependence of the characteristic parameters on method of preparation and reveal that the idealized description sometimes assumed for these membranes is not always justified.
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