Shape up your polymersome: Polymeric vesicles composed of block-copolymers with a glassy hydrophobic segment are no longer merely destined to take on the morphology obtained right after self-assembly. Gradual introduction of plasticizing solvents creates a permeable vesicular membrane, which together with osmotic pressure differences leads to shape transformation (see scheme).
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Meeuwissen et al. (2011) studied this question.
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