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Procedure of layer-by-layer adsorption

Example: Substrate is treated in 5% solution of 3-aminopropyldi-methylethoxysilane and washed in organic solvents. The first step of anionic compound adsorption is carried out in an acidic solution in order to protonate the aminogroups on the surface of the substrate (20 min in a solution containing anionic compound in a mixture of HCl, DMSO, and water at 0C). Then substrate is washed with water and used for the adsorption of cationic compound.

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