EFFECT OF IONIC SURFACTANTS ON THE ELECTROKINETIC BEHAVIOR OF MACROPOROUS GLASSES

The electrokinetic potential and surface conductance of the membranes manufactured from porous glass (PG) with the pore radii 66 and 160 nm were measured in solutions containing a specifically adsorbing, counte rion (cetylpyridinium, CP+) and colon (dodecylsulfate, DS-). It was es tablished that the specific adsorption of DS- colons in a neutral rang e of pH does virtually not change the surface conductance of PG and le ads to an increase in the /zeta/ electrokinetic potential at C > 3 x 1 0(-3) M. A decrease in pH of the solution leads to an increase in the specific adsorption of DS- ions and to higher (than for NaCl) zeta val ues at pH < 6. The specific adsorption of surface active CP+ counterio ns causes the reversal of the sign of the zeta-potential (the isoelect ric point corresponds to C-IEP = 2.3 x 10(-4) M), and the extremum cha racter of the dependences of the efficiency coefficient and the specif ic surface conductivity on the concentration of the cetylpyridinium ch loride solution with the minima at the isoelectric point.