High-Yield Synthesis of Monodisperse Dumbbell-Shaped Polymer Nanoparticles
Original Entry: Tom Dimiduk APPHY 225 Fall 2010
[High-Yield Synthesis of Monodisperse Dumbbell-Shaped Polymer Nanoparticles http://pubs.acs.org.ezp-prod1.hul.harvard.edu/doi/pdf/10.1021/ja101760q]
Surface Tension, Janus Colloid, Polymerization, Asymmetry, Core-shell Particle
The authors present a high yield, scalable method for synthesis of asymmetric nanoparticles with aspect ratios of up to 1.8. They use core shell particle consisting of a polystyrene core with a random copolymer of styrene and trimethoxysilylpropylacrylate (TMSPA) grown on the outside as a shell. The polystyrene can be swelled with toluene or styrene monomer. At sufficiently high swelling, the core will breach through the copolymer shell (see figure 1 and 2). They then polymerize on more polystyrene, it preferentially adds to the polystyrene numb protruding from the core-shell particle. By controlling ammount of monomer added, they can control the aspect ratio of the particles. These particles self assemble into interesting structures which the authors believe may be useful for photonic crystal applications.