Influence of iron oxide nanoparticles on the rheological properties of hybrid chitosan ferrogels.
Magnetite nanoparticles have been successfully synthesized in the presence of chitosan using an in situ coprecipitation method in alkali media. This method allows obtaining chitosan ferrogels due to the simultaneous gelation of chitosan. The chitosan concentration has been varied and its effects on the particle synthesis investigated. It has been demonstrated that high chitosan concentrations prevents the formation of magnetite due to the slow diffusion of the alkali species through the viscous medium provided by chitosan, instead iron hydroxides are formed. The presence of magnetite nanoparticles increases the elastic modulus which results in a reinforcement of the chitosan ferrogels. This effect is counterbalanced by the disruption of hydrogen bonding responsible for the formation of chitosan hydrogels in alkali media.
Hernández
Rebeca
R
Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva, 3, 28006 Madrid, Spain. rhernandez@ictp.csic.es
Zamora-Mora
Vanessa
V
Sibaja-Ballestero
María
M
Vega-Baudrit
José
J
López
Daniel
D
Mijangos
Carmen
C
D048271:Chitosan / Q000737:chemistry*; D055119:Elastic Modulus; D005290:Ferric Compounds / Q000737:chemistry; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D020100:Hydrogels / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles; D012212:Rheology
D005290:Ferric Compounds; D020100:Hydrogels; C000499:ferric oxide; D048271:Chitosan; D052203:Ferrosoferric Oxide