Hollow polyelectrolyte capsules have been recently introduced as a novel type of artificial smart material. Here is reported the successful filling of polyelectrolyte capsules based on human erythrocytes with various dye compounds using a novel method of selective precipitation. Control of surface properties and conditions leads to preferential crystallization in the interior of the capsules, as shown schematically in the Figure.
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Sukhorukov et al. (2000) studied this question.