title: Self-assembly of maltoheptaose-block-polystyrene into micellar nanoparticles and encapsulation of gold nanoparticles.
abstract: The present paper discusses the controlled self-assembly of sugar-containing block copolymer, maltoheptaose-block-polystyrene (MH(1.2k)-b-PS(4.5k)), into micellar nanoparticles of ca. 30 nm radius in aqueous media and their possibility of gold encapsulation. Micellar association of MH(1.2k)-b-PS(4.5k) into nanoparticles was demonstrated by mixing a large amount of water (MH-selective solvent) with a solution of MH(1.2k)-b-PS(4.5k) in a mixture of tetrahydrofuran (THF) (PS-selective solvent) and water with a certain weight fraction [4:1 (w/w) THF/water], where MH(1.2k)-b-PS(4.5k) exists as well-swollen single chains, followed by evaporation of THF. The mean hydrodynamic radii (Rh) of the nanoparticles were determined by dynamic light scattering (DLS) to be ca. 30 and 80 nm depending upon the method of preparation. The resulting nanoparticles were clearly visualized by transmission electron microscopy (TEM), atomic force microscopy (AFM), and field emission gun-scanning electron microscopy (FEG-SEM) imaging and complemented by nanoparticle tracking analysis (NTA) using a NanoSight instrument. The preliminary study of the self-assembly of MH(1.2k)-b-PS(4.5k) in the presence of gold nanoparticles functionalized with PS chains grafted on their surface indicated potential possibilities of encapsulation of gold nanoparticles into the block copolymer nanoparticles in aqueous media.
authors.affiliation: Centre de Recherches sur les Macromolécules Végétales (CERMAV, UPR-CNRS 530), affiliated with Grenoble Alpes University, member of Institut de Chimie Moléculaire de Grenoble (ICMG, FR-CNRS 2607) and Institut Carnot PolyNat, BP53, 38041 Grenoble Cedex 9, France.
authors.forename: Issei
authors.initials: I
authors.lastname: Otsuka
authors.forename: Marina
authors.initials: M
authors.lastname: Osaka
authors.forename: Yoko
authors.initials: Y
authors.lastname: Sakai
authors.forename: Christophe
authors.initials: C
authors.lastname: Travelet
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Putaux
authors.forename: Redouane
authors.initials: R
authors.lastname: Borsali
mesh_terms: D005936:Glucans / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008823:Micelles; D018625:Microscopy, Atomic Force; D046529:Microscopy, Electron, Transmission; D011108:Polymers / Q000737:chemistry; D011137:Polystyrenes / Q000737:chemistry*
chemical_list: D005936:Glucans; D008823:Micelles; D011108:Polymers; D011137:Polystyrenes; C031146:maltoheptaose; D006046:Gold