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A defined and controllable permeability of the capsule wall of hollow polyelectrolyte capsules has been achieved. The walls of these capsules can be switched between an open and a closed state with respect to macromolecules by adjusting the salt concentration of the solution in which the capsules are dispersed. The Figure shows part of the mechanism to encapsulate and release macromolecules by this method.
Ibarz et al. (Sat,) studied this question.