Preparation of hybrid hollow capsules formed with Fe3O4 and polyelectrolytes via the layer-by-layer assembly and the
Masato Nakamura1, Kiyofumi Katagiri, Kunihito Koumoto
1Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
Abstract:
Well-defined magnetic hybrid hollow capsules formed with magnetite (Fe(3)O(4)) and polyelectrolyte-multilayer films were successfully prepared through colloidal templating with layer-by-layer assembly of polyelectrolytes, followed by aqueous solution deposition of Fe(3)O(4). Pd catalyst nanoparticles played an important role in the deposition of Fe(3)O(4). Pd nanoparticles favorably adsorbed onto the polyelectrolyte layer with positively charged amino groups. Hollow capsules were obtained by the removal of the melamine-formaldehyde core particles. Although the processes were performed in aqueous solutions at temperatures less than 60 degrees C, X-ray diffraction patterns revealed that the deposited Fe(3)O(4) was highly crystallized. The hollow capsules were stably dispersed in water; however, the capsules rapidly congregated around a locally applied magnet.
