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J. Korean Ceram. Soc. > Volume 57(1); 2020 > Article
Journal of the Korean Ceramic Society 2020;57(1): 80-84.
doi: https://doi.org/10.1007/s43207-019-00001-3
Highly dispersible Fe3O>sub>4 nanoparticles via anionic surface modification
Jae Uk Hur, Jae Seok Choi, Sung‑Churl Choi, Gye Seok An
Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni‑ro, Seongdong‑gu, Seoul 04763, South Korea
Correspondence  Gye Seok An ,Email: faustmaro@hanyang.ac.kr
Received: November 8, 2019;  Accepted: November 18, 2019.  Published online: January 31, 2020.
ABSTRACT
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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