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This work addresses the challenge of creating hollow polymer capsules with wall thickness in the single-nanometer range under mild conditions. We present a simple and scalable method for the synthesis of hollow polymer nanocapsules in the bilayers of spontaneously assembled surfactant vesicles. Polymerization is initiated thermally with the help of a peroxide initiator and an amine activator codissolved with monomers and cross-linkers in the hydrophobic interior of the surfactant bilayer. To avoid premature polymerization, the initiator and the activator were added separately to the mixtures of cetyltrimethylammonium tosylate (CTAT) and sodium dodecylbenzenesulfonate (SDBS) containing monomers and cross-linkers. Upon hydration and mixing of the aqueous solutions, equilibrium monomer-loaded vesicles formed spontaneously after a brief incubation. The removal of oxygen and further incubation at slightly elevated temperatures (35-40 °C) for 1 to 2 h has led to the formation of hollow polymer nanocapsules. Structural and permeability characterization supported the high yield of nanocapsules with no pinhole defects.

Directed Assembly of Vesicle-Templated Polymer Nanocapsules under Near-Physiological Conditions