UNPAD Researchers Optimize Oleic-Acid–Modified Magnetite Nanoparticles for Biomedical Use (SDG 3 & SDG 9)
A Universitas Padjadjaran team reports an in-situ oleic acid (OA) surface modification during co-precipitation—with controlled mechanical stirring (250/500 rpm)—to produce Fe₃O₄ nanoparticles that stay well-dispersed and retain the inverse-spinel crystal structure. TEM shows spherical particles (≈11.39–36.94 nm), while FTIR confirms carboxylate binding of OA; XRD indicates crystallites ≈7.91–11.35 nm.
Magnetic tests (SQUID) at 300 K yield Ms ≈ 54.6–68.3 emu/g, Hc ≈ 21.9–25.1 Oe, Mr ≈ 1.66–2.47 emu/g—and a blocking temperature TB ≈ 279.94 K, meaning the samples exhibit superparamagnetic-like behavior near room temperature, desirable for targeted drug delivery and other biomedical applications.

Read more (Open Access): https://doi.org/10.1186/s40712-025-00303-x