Spinel Magnetic Iron Oxide Nanoparticles: Properties, Synthesis and Washing Methods

Abstract

Nanoparticles have experienced increasing interest over the past three decades owing to the development of new synthesis methods and the adaptation of analysis tools with spatial resolutions below one micrometer. Among the different types of nanoparticles developed in recent years (metals, metal oxides, silica, polymers, etc.), significant scientific interest has developed around iron oxide nanoparticles. This review will focus on these magnetic iron oxide nanoparticles. We will first discuss the magnetic properties of iron oxide nanoparticles, then the different methods of synthesis and washing. Finally, we will discuss some functionalization strategies of iron oxide nanoparticles which are developed within our research team.

Unveiling the role of inorganic nanoparticles in Earth’s biochemical evolution through electron transfer dynamics

“…Tetrahedral sites house Fe (III) ions, while octahedral sites contain both Fe (III) and Fe (II) ions in equal measure. This leads to the chemical formula Fe(III) tetra [Fe(II)Fe(III)] octa (O 2− ) 4 , indicating the position of ferrous and ferric ions within the structure 132 ( Figure S7 E). Similarly, maghemite displays a spinel crystal structure with all iron cations in the trivalent state, and the charge neutrality of the cell is maintained through the presence of cation vacancies.…”

Superparamagnetic Iron Oxide Nanoparticles (SPION): From Fundamentals to State-of-the-Art Innovative Applications for Cancer Therapy

“…Once magnetized, a ferrimagnetic material retains its magnetic properties due to the non-instantaneous nature of the magnetic spins orientation with the field. This phenomenon gives rise to the remanent magnetization (M R ), coercive field (H C ), and hysteresis loop observed when the magnetization of a material is measured as a function of the external magnetic field [ 15 ]. Regarding magnetite and maghemite, organization in magnetic domains is usually observed for crystals with sizes above 100 nm [ 16 ].…”

Potential of Iron Oxides in Photovoltaic Technology

“…In contrast, iron oxide has fewer unpaired electrons than standalone iron because of oxygen. The FeO has antiferromagnetic properties, while Fe 3 O 4 and γ-Fe 2 O 3 have ferrimagnetic properties for the temperatures below their Curie temperature ( T C ), at ∼480 and ∼645 °C, respectively, with saturation magnetization ( M S ) around 92 emu/g and 74 emu/g, respectively . α-Fe 2 O 3 and β-Fe 2 O are antiferromagnetic, while ε-Fe 2 O 3 is ferrimagnetic with a very large coercivity field ( H C ) .…”

“…The FeO has antiferromagnetic properties, 92 while Fe 3 O 4 and γ-Fe 2 O 3 have ferrimagnetic properties for the temperatures below their Curie temperature (T C ), at ∼480 and ∼645 °C, respectively, with saturation magnetization (M S ) around 92 emu/g and 74 emu/g, respectively. 104 α-Fe 2 O 3 and β-Fe 2 O are antiferromagnetic, while ε-Fe 2 O 3 is ferrimagnetic with a very large coercivity field (H C ). 105 The magnetic properties of iron oxides are predicted to improve the solar cell's performance.…”