Nanocapsules wall thickness

As a third possibility, nanocapsules in a miniemulsion system could be achieved using different interfacial reactions in inverse miniemulsions. The formation of polyurea, polythiourea, and polyurethane nanocapsules synthesized through the polyaddition reaction has been described in detail [110-112], The size of the nanocapsules could be controlled by the amount of surfactant used and the addition time of the diisocyanate. The wall thickness was adjusted by the amount of employed monomers. dsDNA molecules were successfully encapsulated into poly-butylcyanoacrylate (PBCA) nanocapsules by anionic polymerization, which took place at the interface between the miniemulsion droplets and the continuous phase [113]. 

The examples show the influence of the confinement on polymers. Nanoparticles and nanocapsules of PS-6-PMMA with different molecular weights were prepared. Their morphology could be precisely tuned by changing the amount of surfactant and hexadecane in double confinement. Also, the wall thickness of the capsules could be controlled by the amount of hexadecane employed during formation using a miniemulsion process with subsequent solvent evaporation. 

Nanocapsules are generally considered as spherical, hollow structures with an average diameter <1 (im [38-40]. Typically, the capsule consists of a polymeric wall with a thickness in the nanometer region, filled with an oil which can dissolve... 

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