| Highly dispersible Fe3O>sub>4 nanoparticles via anionic surface modification |
Jae Uk Hur, Jae Seok Choi, Sung‑Churl Choi, Gye Seok An
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| Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni‑ro, Seongdong‑gu, Seoul 04763, South Korea |
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Received: November 8, 2019; Accepted: November 18, 2019. Published online: January 31, 2020. |
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| ABSTRACT |
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The dispersibility in an aqueous solution of magnetite nanoparticles was enhanced by appropriate anionic surface treatment. The Fe3O>sub>4 nanoparticles were modified with various types of the precursor to include anionic terminal functional groups. The nanoparticles modified by polyacrylic acid, tri-sodium citrate dihydrate or ammonia exhibited an increased zeta potential owing to the large amount of terminal hydroxyl and carboxyl groups. As a result, the surface-modified particles exhibited improved dispersion behaviour in the aqueous solution owing to a change in the electrostatic force due to the surface charge on each particle. In addition, the physical properties of the surface-modified magnetite nanoparticles were discussed. |
| Key words:
Magnetite · Dispersion · Superparamagnetic nanoparticle · Surface modification · Electrostatic hindrance |
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