Synthesis and Characterization of Monodispersed Core−Shell Spherical Colloids with Movable Cores
- 6 February 2003
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 125 (9), 2384-2385
- https://doi.org/10.1021/ja0292849
Abstract
Gold nanoparticles have been conformally coated with amorphous silica (using a sol−gel method) and then an organic polymer (via surface-grafted, atom transfer radical polymerization) to form spherical colloids with a core−double-shell structure. The thickness of silica and polymer shells could be conveniently controlled in the range of tens to several hundred nanometers by changing the concentration of the reagent and/or the reaction time. Selective removal of the silica layer (through etching in aqueous HF) led to the formation of hollow polymer beads containing movable gold cores. This new form of core−shell particles provides a unique system for measuring the feature size and transport property associated with hollow particles. In one demonstration, we showed that the thickness of a closed polymer shell could be obtained by mapping the electrons backscattered from the core and shell. In another demonstration, the plasmon resonance band of the gold cores was used as an optical probe to follow the diffusion kinetics of chemical reagents across the polymer shells.Keywords
This publication has 17 references indexed in Scilit:
- Synthesis and Utilization of Monodisperse Superparamagnetic Colloidal Particles for Magnetically Controllable Photonic CrystalsChemistry of Materials, 2001
- Synthesis and Characterization of Mesoscopic Hollow Spheres of Ceramic Materials with Functionalized Interior SurfacesChemistry of Materials, 2001
- Preparation of Structurally Well-Defined Polymer−Nanoparticle Hybrids with Controlled/Living Radical PolymerizationsJournal of the American Chemical Society, 1999
- Preparation and Optical Properties of Colloidal Gold MonolayersLangmuir, 1999
- Novel Hollow Polymer Shells by Colloid-Templated Assembly of PolyelectrolytesAngewandte Chemie-International Edition, 1998
- Assembly of Latex Particles by Using Emulsion Droplets as Templates. 1. Microstructured Hollow SpheresLangmuir, 1996
- Effect of the Solution Refractive Index on the Color of Gold ColloidsLangmuir, 1994
- Preparation of monolayer particle coated powder by the dry impact blending process utilizing mechanochemical treatmentColloids and Surfaces A: Physicochemical and Engineering Aspects, 1994
- Preparation and properties of uniform size colloidsChemistry of Materials, 1993
- Mechanism of sustained‐action medication. Theoretical analysis of rate of release of solid drugs dispersed in solid matricesJournal of Pharmaceutical Sciences, 1963