One-Step Formation of Morphologically Controlled Nanoparticles with Projection Coronas
Identifieur interne : 000270 ( Istex/Checkpoint ); précédent : 000269; suivant : 000271One-Step Formation of Morphologically Controlled Nanoparticles with Projection Coronas
Auteurs : Tatsuo Kaneko [Japon] ; Kazuhiro Hamada [Japon] ; Ming Qing Chen [Japon] ; Mitsuru Akashi [Japon]Source :
- Macromolecules [ 0024-9297 ] ; 2003.
Abstract
Nanoparticles with projection coronas were prepared by the one-step dispersion terpolymerization of styrene, acrylonitrile, and poly(ethylene glycol) monomethacrylate in ethanol−water solution, and their morphologies were controlled. When the mole composition of acrylonitrile to the total monomers CAN was 0.49−0.66, electron microscopy showed that the nanoparticles were spherical and had a number of projections on the surface. A CAN of more than 0.66 yielded no nanospheres, and a CAN smaller than 0.49 yielded projection-free nanospheres. The morphology of the nanospheres could be controlled by changing the reaction conditions, and some conditions yielded a regular arrangement of uniform projections on the surface similar to that seen in some coronaviruses. X-ray and spectroscopic studies suggested that the projections might be formed as a result of the nonequilibrated swelling of acrylonitrile and poly(ethylene glycol) domains on the surface.
Url:
DOI: 10.1021/ma035276g
Affiliations:
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<front><div type="abstract">Nanoparticles with projection coronas were prepared by the one-step dispersion terpolymerization of styrene, acrylonitrile, and poly(ethylene glycol) monomethacrylate in ethanol−water solution, and their morphologies were controlled. When the mole composition of acrylonitrile to the total monomers CAN was 0.49−0.66, electron microscopy showed that the nanoparticles were spherical and had a number of projections on the surface. A CAN of more than 0.66 yielded no nanospheres, and a CAN smaller than 0.49 yielded projection-free nanospheres. The morphology of the nanospheres could be controlled by changing the reaction conditions, and some conditions yielded a regular arrangement of uniform projections on the surface similar to that seen in some coronaviruses. X-ray and spectroscopic studies suggested that the projections might be formed as a result of the nonequilibrated swelling of acrylonitrile and poly(ethylene glycol) domains on the surface.</div>
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