title: Preparation and characterization of core-shell nanoparticles hardened by gamma-ray.
abstract: Core-shell nanoparticles have been prepared by irradiation of gamma-ray on block copolymer micelles consisting of hydrophilic polyacrylic acid and hydrophobic polyisoprene with each 40 monomer units. The structure was determined by means of dynamic light scattering (DLS), small angle X-ray scattering (SAXS) and atomic force microscopy (AFM). The size distribution of the core-shell nanoparticles determined by DLS and AFM was very narrow. The average diameter of the particles decreased from 48 nm for the original micelles to 26 nm by the irradiation of 30 kGy. The core size determined by SAXS combined with DLS was roughly constant of 10 nm, irrespective of irradiation dose, whereas the shell thickness of the micelles was twice as large as the core size, and decreased with increasing irradiation dose.
authors.affiliation: Department of Biological and Chemical Engineering, Faculty of Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Narita
authors.forename: Ken
authors.initials: K
authors.lastname: Terao
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Dobashi
authors.forename: Naotsugu
authors.initials: N
authors.lastname: Nagasawa
authors.forename: Fumio
authors.initials: F
authors.lastname: Yoshii
mesh_terms: D005720:Gamma Rays; D018625:Microscopy, Atomic Force; D036103:Nanotechnology; D010316:Particle Size; D012542:Scattering, Radiation