Ethylenediaminetetraacetic acid as capping ligands for highly water-dispersible iron oxide particles

Abstract

Monodispersed magnetite (Fe3O4) particles were synthesized using a high-temperature hydrolysis reaction with the assistance of ethylenediaminetetraacetic acid (EDTA) as capping ligands. These particles were composed of small primary nanocrystals and their sizes could be tuned from about 400 to about 800 nm by simply changing the EDTA or precursor concentration. Surface-tethered EDTA made the particles highly water-dispersible. The as-prepared magnetite particles also showed superparamagnetic behavior at room temperature, and their magnetic properties were size dependent. In addition, the particles had a strong response to external magnetic field due to their high magnetization saturation values. These properties were very important for some potential biomedical applications, such as magnetic separation and magnetic-targeted substrate delivery.

Convenient pH-responsive removal of Acid Black 1 by green l-histidine/iron oxide magnetic nanoadsorbent from water: performance and mechanistic studies

“…The larger clusters of bare MNPs as compared to His-MNPs indicate that surface coating with L-His could stabilize MNPs, which might suppress their aggregation. 30 Thus, the results of AFM and SEM are in close agreement with each other. The SEM-EDS spectra ( Fig.…”

Cu nanoparticles embedded on reticular chitosan-derived N-doped carbon: Application to the catalytic hydrogenation of alkenes, alkynes and N-heteroarenes

“…Crystalline copper nanoparticles grown on carbonized chitosan without cross-linking (EDTA) in CuCS-700 or without using melamine in CuNC-700, display similar diffraction patterns, but giving a large crystal size of 48 nm and 37 nm, respectively. This confirms the proposed role of EDTA as a cross-linker to sequestrate the growing metal leading to high particles dispersion [39], and the use of the nitrogen for stabilizing smallsized metal species in the materials [40]. No copper oxides or other crystalline phase were observed, indicating selective formation of crystalline copper nanoparticles.…”

Role of capping agents in the application of nanoparticles in biomedicine and environmental remediation: recent trends and future prospects

“…Rahal et al [ 40 ] synthesized nickel oxide (NiO) nanoparticles capped with EDTA via co-precipitation method and results showed that EDTA capped nanoparticles were smaller in size as compared to the pure NiO nanoparticles with enhanced surface magnetization properties. EDTA was also employed in the synthesis of magnetic iron oxide nanoparticles to enhance the mono dispersion via high-temperature hydrolysis reaction resulting in more water solubility and enhanced magnetic properties [ 41 ].…”