|338. Schacher, F.H.; Betthausen, E.; Walther, A.; Schmalz, H.; Pergushov, D.V.; Müller, A.H.E.: Interpolyelectrolyte Complexes of Dynamic Multicompartment Micelles, ACS Nano 3, 2095 (2009) -- DOI: 10.1021/nn900110s -- PDF|
|Stichworte: Dynamic Multicompartment Micelles, Interpolyelectrolyte Complexes, Hybrid Materials, Gold Nanoparticles|
Dynamic core-shell-shell-corona micelles are formed between two oppositely charged block copolymer systems. Preformed polybutadiene-block-poly(N-methyl-2-vinylpyridinium)-block poly(methacrylic acid) (PB-P2VPq-PMAA) block terpolymer micelles with a soft polybutadiene core, an interpolyelectrolyte complex (IPEC) shell made out of poly(N-methyl-2-vinylpyridinium) and poly(methacrylic acid), and a negatively charged PMAA corona were mixed in different ratios at high pH with positively charged poly(N-methyl-2-vinylpyridinium)-block-poly(ethylene oxide) (P2VPq-PEO) diblock copolymers. Under these conditions, mixing results in the formation of a second IPEC shell onto the PB-P2VPq-PMAA precursor micelles, surrounded by a PEO corona. The resulting multicompartmented IPECs exhibit dynamic behavior, highlighted by a structural relaxation within a period of 10 days, investigated by dynamic light scattering (DLS), cryogenic transmission electron microscopy (cryo-TEM), and scanning force microscopy (SFM). After a short mixing time of 1h, the IPECs exhibit a star-shaped structure whereas after 10 days spherical core-shell-shell-corona objects could be observed. To further increase complexity and versatility of the presented systems, the in-situ formation of gold nanoparticles (Au-NPs) in both the precursor micelles and the equilibrated IPEC was tested. For the PB-P2VPq-PMAA micelles, NP formation resulted in narrowly distributed Au-NP located within the PMAA shell whereas for the core-shell-shell-corona IPEC the Au-NPs were confined within the IPEC shell and shielded from the outside through the PEO corona.
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