I. P. Sergeeva, D. A. Semenov, V. D. Sobolev, and N. V. Churaev
Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia
Received July 31, 2007
Abstract—The effect of molecular mass on the formation of a bilayer structure upon the layer-to-layer adsorp-
tion of a cationic polyelectrolyte (poly(dimethyldiallylammonium chloride), molecular mass M = 500 000 and
100 000–200 000 Da) and an anionic polyelectrolyte sodium (poly(acrylate), M = 30 000 and 2100 Da) on the
surface of fused quartz is studied by the capillary electrokinetic method. The time required to reach constant
adsorption values and the structure of bilayer systems depend on the ratio between molecular masses of the cat-
ionic and anionic polyelectrolytes. The deformability of the bilayer system significantly exceeds that of the first
layer in the case when the second layer is formed from an anionic polyelectrolyte with a lower molecular mass,
thus suggesting the loosening of the first adsorption layer of the cationic polyelectrolyte. The adsorption of the
anionic polyelectrolyte with higher molecular mass insignificantly affects the density of the first layer. Variation
in the deformability of the layer with time (its aging) depends on the ratio between molecular masses of the
polyelectrolytes.
DOI: 10.1134/S1061933X08050116
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