Mechanisms of adsorption of an azo-polyelectrolyte onto layer-by-layer films

摘要: Abstract The mechanisms which lead to the adsorption of azopolyelectrolyte poly[1-[4-(3-carboxy-4-hydroxyphenylazo) benzene sulfonamido]-1,2-ethanediyl, sodium salt] (PAZO) layer adsorbed onto layer-by-layer films were investigated by monitoring amount per unit area as a function time. kinetics curves obtained variables PAZO concentration and drying process. data was shown be described two processes, one with smaller characteristic time, order seconds, attributed nucleation mechanism second process, times tenth minutes, associated diffusion. During first molecules rapidly adsorb substrate surface creating an electrostatic barrier that makes difficult more molecules. However, positive counterions are allowed they potential is lowered, allowing adsorbed. This last accounting for processes not seen influenced only contribute changes in values parameters, i.e., corresponding amounts. These parameters related available number sites dependent presence both water on layer.