John Erik Wong, Akhilesh Krishnakumar Gaharwar, Detlef Müller-Schulte, Dhirendra Bahadur, Walter Richtering:
Layer-by-Layer assembly of a magnetic nanoparticle shell on a thermoresponsive microgel core
Journal of Magnetism and Magnetic Materials, 2007, 311(1), 219-223
We describe the surface modification of magnetic nanoparticles (MNPs), the coverage of poly(N-isopropylacrylamide) (PNiPAM) microgel with the MNPs and the inductive heating of these carriers. PNiPAM surface itself was modified using the layer-by-layer (LbL) assembly of polyelectrolytes to facilitate the deposition of surface-modified MNPs. One advantage of this concept is it allows the tuning of the magnetic and thermoresponsive properties of individual components (nanoparticles and microgels) separately before assembling them. Characterisations of the hybrid core-shell are discussed. In particular, it is shown that (i) each layer is successfully deposited and, more importantly, (ii) the coated microgel retains its thermoresponsive and magnetic behaviour.