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Influence of iron oxide nanoparticles on the rheological properties of hybrid chitosan ferrogels

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Academic year: 2020

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Fig. 2. Schematic representation of the synthesis of iron oxide in the presence of a chitosan solution: (a) neat chitosan; (b) formation of a complex Fe–chitosan and (c) chitosan ferrogel (black dots represent iron oxide nanoparticles).
Fig. 4. Wide angle X-ray diffractograms of: (a) pure chitosan; (b) 2 wt.% chitosan ferrogel immersed in NaOH for 1 h and (c) 3 wt.% chitosan ferrogel immersed in NaOH for 1 h.
Fig. 7. FT-IR spectra of: (a) raw chitosan; (b) 2 wt.% chitosan ferrogel and (c) 3 wt.%
Fig. 8 shows a representative plot of the frequency dependence of G 0 and G 00 for a 2 wt.% chitosan hydrogel formed by neutralizing an acidic solution of chitosan with an alkali coagulating solution.
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