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- W2912511974 abstract "Ferrogel beads composed of iron-oxide nanoparticles (FeOx NPs) and chitosan hydrogel (CH) were successfully synthesized using a syringe pump system. The dynamic magnetic susceptibility were also investigated in the frequency ranges of 10Hz-10kHz via PPMS, and 100Hz-100kHz via coil-FRA-system built in the laboratory. Synthesis is done by dropping the CH/ Fe3+/Fe2+ solution in a syringe, which is controlled by a syringe-assisted pump device, into an NH4OH coagulation bath to form the ferrogel beads. The CH concentration and the ratio of Fe3+/Fe2+ precursors were also varied for synthesis optimization. We have demonstrated that the amount of CH does not affect the Fe3O4 NPs inside the gel, whereas the Fe3+/Fe2+ with ratio of 1:2 and 1:3 can produce ferrogel beads with Fe3O4 crystal structures. PPMS results showed that the imaginary part of susceptibility has peak around 200 Hz whereas two peaks showed at 200Hz and 18000Hz using the coil-FRA-system. Using the Brownian relaxation equation, the hydrodynamic size of the FeOx NPs inside the beads were estimated to be have a bimodal size distribution. This bimodal distribution of the NPs hydrodynamic size were inferred to be due to the clustered and unbound NPs inside the ferrogel beads. We have demonstrated that by studying the dynamic susceptibility of ferrogel beads could help us understand the morphological properties of NPs within the ferrogel." @default.
- W2912511974 created "2019-02-21" @default.
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- W2912511974 date "2019-01-01" @default.
- W2912511974 modified "2023-10-12" @default.
- W2912511974 title "Facile synthesis and AC characterization of chitosan and iron oxide nanoparticles magnetic beads" @default.
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- W2912511974 doi "https://doi.org/10.1063/1.5089449" @default.
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