Abstract
Fe3O4 nanoparticles with cluster structure are superparamagnetic particles with applicability in various high-tech fields. In this study, the influence of surface modification with polyacrylic acid (PAA), a polymeric precursor, on the characteristics of Fe3O4 nanoparticles was investigated. The particles were synthesized by the polyol method and surface modified with various amounts of PAA. The surficial, structural, optical, and magnetic properties of the PAA-modified Fe3O4 nanoparticles were analyzed, confirming that negatively charged carboxyl groups were formed on the particle surface, and the particle dispersibility was enhanced by surface modification. This arises from an increase in the electrostatic repulsive force due to the surface functional groups. Functionalization promoted dissociation of the cluster particles, which became more pronounced as the PAA content increased. The optical parameters changed with the PAA content. Analysis of the magnetic properties showed that the saturation magnetization decreased as the PAA content increased. Overall, PAA modification induces structural changes of the Fe3O4 nanoparticles that enhance the dispersibility and influence the characteristics of the particles.
Highlights
Superparamagnetic nanoparticles are a group of materials that have received significant attention because of their unique physical properties, distinctive magnetic properties, and high magnetic susceptibility [1,2]
The Fe3 O4 nanoparticles exhibited suitable colloidal stability in aqueous and physiological media due to the increased electrostatic repulsive force induced by the carboxyl groups on the surface, and it was confirmed that these particles exhibited resistance to bovine serum albumin (BSA) protein due to the negative surface charge
This study focused on the structural changes of Fe3 O4 nanoparticles cluster structure synthesized by polyol method according to the amounts of carboxyl precursor, and the effect of the changes on the characteristics of Fe3 O4
Summary
Superparamagnetic nanoparticles are a group of materials that have received significant attention because of their unique physical properties, distinctive magnetic properties, and high magnetic susceptibility [1,2]. Negatively charged carboxyl groups were formed on the surface of the particles, and the magnetic properties of the Fe3 O4 nanoparticles changed according to the surface modifier. The results confirmed that the particle size, shape, and optical properties were changed by surface treatment using organic modifiers These prior studies consistently illustrate changes in the structure and properties of Fe3 O4 nanoparticles via surface treatment. Most of these prior studies have not focused on the specific change of structure and properties according to condition of surface functionalization such as amounts of surface modifier For this reason, this study focused on the structural changes of Fe3 O4 nanoparticles cluster structure synthesized by polyol method according to the amounts of carboxyl precursor, and the effect of the changes on the characteristics of Fe3 O4. Processes 2021, 9, 1795 as aqueous dispersibility, are presented by comprehensive analysis of the characteristics arising from controlled surface modification
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