water-soluble polyelectrolyte complexes has been intensively studied by means of turbidity measurements [58]. Aqueous mixtures of oppositely charged polyelectrolytes are usually homogenous at the stoichiometry far from the neutralization point. First, such complexes permit an increase in the size of the assembly construction blocks. Second, they make it possible to immobilize with polyion, which were impossible to use in the assembly directly (poor charged nanoparticles, dyes, and proteins).

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