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The present work introduces colloid behaviour of core-shell nanoparticles, where hard paramagnetic cores are coated by hydrophilic polyelectrolyte-based shells. Paramagnetic cores are built from water insoluble Gd(III) complexes with alkyl-malonate derivatives of thiacalix[4]arenes adopting 1,3-alternate conformation. Polystyrenesulfonate (PSS) and polyethyleneimine (PEI) are used to deposit one (PSS) or two (PSS-PEI) polyelectrolyte layers onto the cores. Small angle light scattering was used to reveal both size and aggregation behaviour of the core-shell colloids in aqueous solutions.

Colloid Properties of Paramagnetic Nanoparticles Based on Novel Thiacalix[4]arenes and Gd(III) Ions