title: Nanoparticle-loaded cylindrical micelles from nanopore extrusion of block copolymer spherical micelles.
abstract: Hybrid cylindrical micelles loaded with nanoparticles are fabricated via extrusion of spherical micelles in solution phase through small long cylindrical pores. Small gold nanoparticles (AuNPs) are pre-coated with thiol-terminated polystyrene and then further encapsulated in the core part of block copolymer spherical micelles by a precipitation method. By varying the starting mass ratio of AuNPs and the diblock copolymers polystyrene-b-polyisoprene (PS-b-PI) during the encapsulation, the AuNPs loading density along the cylindrical micelles can be controlled. The mechanism for this sphere-to-cylinder transition induced by extruding hybrid spherical micelles through small cylindrical nanopores is discussed. These findings provide a novel way to manufacture high-quality and functional polymeric nano-wires, which may open the door to new applications such as in plasmonic waveguides.
authors.affiliation: Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong.
authors.forename: Qianjin
authors.initials: Q
authors.lastname: Chen
authors.forename: Jianqi
authors.initials: J
authors.lastname: Wang
authors.forename: Lei
authors.initials: L
authors.lastname: Shao
mesh_terms: D002070:Butadienes / Q000737:chemistry*; D006046:Gold / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry; D008823:Micelles; D046529:Microscopy, Electron, Transmission; D058608:Nanopores / Q000648:ultrastructure*; D010316:Particle Size; D010420:Pentanes / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry*
chemical_list: D002070:Butadienes; D008823:Micelles; D010420:Pentanes; D011137:Polystyrenes; C522518:polystyrene-block-polyisoprene; D006046:Gold
keywords: block copolymer; gold nanoparticles; hybrid cylindrical micelles; nanopore extrusion