Dyeing method for determining pore radius of dialysis membranes

Abstract

A newly-improved method using dye (C. I. Direct Yellow 12 M. W. 680) was employed to determine pore radius of small tubular dialysis membranes made of regenerated cel lulose (RC). The diffusion coefficient of the dye in pores was measured by dyeing method. The diffusion coefficient allows determination of membrane pore radius using pore theory. The dye diffuses in membrane pores obeying Fick's 2nd law and pore radius data were almost identical with those obtained by RI method.