Table 1.

Au-colloid binding capacities of 5-µm nylon membranes modified with multilayer polyelectrolyte films. The Au-colloid feed solution contained 0.05 mM Au and was passed through the membrane at a flux of 19 cm/h. (Multiple numbers represent experiments with different membranes.)

Polyelectrolyte Film	aBinding Capacity at 80% Breakthrough (mg/mL)
	1 bilayer	2 bilayers	3 bilayers
PSS/PEI	26,28	31,31	30,39,40,42
PSS/PAH	9,6	14,23	14,25
PSS/PDADMAC	10,17	37,31	37,41,73a

^aFor these membranes, the capacity was determined at <80% breakthrough in two of three cases because these particular systems sometimes plug, or flux greatly decreases.