Structurally stable hybrid magnetic materials based on natural polymers – preparation and characterization

Abstract

Novel, structurally stable hybrid magnetic materials based on polymers of natural origin and containing superparamagnetic iron oxide nanoparticles (SPIONs) were obtained. SPIONs coated with the chitosan derivative were linked with the chitosan-collagen hydrogel matrix by the covalent bonds formed between the macromolecules of nanoparticles' coating and matrix on their crosslinking with genipin. The systems obtained were structurally stable as confirmed by turbidity studies. Their microstructure was determined by electron microscopy studies (SEM). The homogenic distribution of SPIONs in hybrid materials was observed by Scanning Transmission Electron Microscopy (STEM). Magnetic force microscopy (MFM) confirmed the magnetic properties of hybrids and SPIONs distribution within the samples. The rheological studies allowed to determine the effect of hybrid material composition on their mechanical properties (storage modulus). Magnetic characterization confirmed that SPIONs preserved their superparamagnetic properties in the hybrid materials fabricated.

Keywords

• Magnetic hydrogels
• Hybrid materials
• Magnetic nanoparticles
• Biopolymers
• Immobilization