METHOD OF MEASURING SIZES OF PORES OF MEMBRANES Russian patent published in 1994 - IPC

FIELD: measurement technology. SUBSTANCE: chamber which has standard and tested membrane is filled with deionized water. Water is under effect of electric field generated by potential difference between electrodes which are disposed on both sides of the membrane. Rate of changes in hydrogen factor or redox-potential is measured. Diameters of pores are calculated from the relation d²=d2s

_tand · v/v_stand, where d and d_stand are diameters of pores of tested and standard membranes correspondingly; V and v_stand are rates of changes in hydrogen potential of redox-potential when using tested and standard membranes correspondingly. EFFECT: improved precision of measurement.