Deep eutectic solvent electrolysis for preparing water-soluble magnetic iron oxide nanoparticles.

Area of Science:

• Materials Science
• Nanotechnology
• Electrochemistry

Background:

• Magnetic iron oxide nanoparticles (MIONPs) are crucial for biomedical applications.
• Synthesizing stable, highly dispersible hydrophilic MIONPs remains a challenge.
• Existing methods often lack control over quantity and dispersibility.

Purpose of the Study:

• To present a novel deep-eutectic solvent electrolysis method for MIONP synthesis.
• To achieve high quantity and controllability in preparing water-dispersible MIONPs.
• To overcome limitations of current MIONP synthesis strategies.

Main Methods:

• Utilized deep-eutectic solvent electrolysis for MIONP synthesis.
• Oxidized iron from the anode electrode to ferric ions.
• Combined ferric ions with reactive oxygen species from solvent decomposition to form iron oxide nanocrystals.
• Grafted hydrophilic amine groups onto nanoparticles during synthesis.

Main Results:

• Synthesized monodisperse MIONPs with sizes ranging from 6 to 9 nm.
• Achieved stable, highly dispersible hydrophilic nanoparticles in water without post-modification or stabilizers.
• Observed hydrodynamic particle diameters between 20 and 30 nm.
• Maintained transparent aqueous dispersions for over 600 days without precipitation.

Conclusions:

• Deep-eutectic solvent electrolysis is an effective method for synthesizing stable, hydrophilic MIONPs.
• The synthesized nanoparticles exhibit excellent water dispersibility and long-term stability.
• This method offers a controllable and scalable approach for producing MIONPs for biomedical use.