Thermoresponsive polymeric nanoparticles stabilized by surfactants
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Solutions of poly(N-isopropylacrylamide) (PNIPA) with ionic and nonionic surfactants were investigated by light scattering methods at temperatures 15–45 °C. In contrast to previous studies, where surfactants were used in excess, lower concentrations of surfactants were used. The formation of well-defined nanoparticles of PNIPA was observed on heating above the lower critical solution temperature. The effect of PNIPA and surfactant concentrations, and molecular weight of PNIPA on nanoparticle parameters and on the phase transition temperature of PNIPA solutions were investigated. An interpretation based on stabilization of PNIPA nuclei by surfactants was suggested.
KeywordsLight scattering Nanoparticles Particle nucleation Poly(N-isopropylacrylamide) Surfactants
Financial support of the Grant Agency of the Academy of Sciences of the Czech Republic (grants A100500501) is gratefully acknowledged.
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