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Structural and magnetic properties of iron species/SiO 2 nanocomposites obtained by sol‐gel methods

“…in all samples. Previously reported X-ray diffraction [6] and transmission electron microscopy [2] data have shown only short-range local order (amorphous state) in all com-posites, and hence, the difficulty of a reliable analysis of the iron phase composition, with main influence on the magnetic properties. In order to overcome this aspect, the high resolution 57 Fe Mössbauer spectroscopy was used for the simultaneous analysis of iron phase composition and local magnetic interactions.…”

“…FeSO 4 ·7H 2 O was used as iron oxide source, while the SiO 2 matrix was obtained starting from the following precursors: tetraethoxysilane (TEOS), methyltriethoxylane (MTEOS), phenyltriethoxysilane (PTEOS) and colloidal silica sol (Ludox). The preparation and the general structural characterization of the iron oxide-SiO 2 nanocomposites have been already reported [6][7][8]. This paper reports on the influence of the matrix on the phase composition and structural/morphological characteristics, as well as on the local magnetic interactions in the iron phases.…”

Influence of Preparation Condition of Iron Hydroxide/Nano-Carbon Composite on Its Properties

“…In the present stage, the Sol-gel precipitation, an effective method to provide uniform nanoparticles, has been utilized. 10,11 Some parameters are to be optimized for the high utility of iron, while rather simple condition without colloid stabilizer in order to avoid the contamination on electrochemical usage. The electrochemistry of iron is somewhat complicated, containing an 'intermediate' oxidation in addition to reversible redox couple Fe(0)/Fe(II).…”

Effect of iron on the dielectric properties of silicate glasses prepared by sol‐gel

“…Recently, iron oxide-silica nanocomposites have been extensively investigated for diverse applications, for instance; in magnetic hyperthermia due to their biocompatibility property [1], in microwave and electronic devices [2], in catalysts [3] as well as sensors [4]. Iron oxide nanocomposites can be synthezied by several methods including chemical methods such as sol-gel, co-precipitation, hydrothermal [4][5][6] or physical methods like laser ablation, mechanical ball milling and sputtering [7][8][9].…”

“…Therefore the size of the magnetic nanoparticles and the magnetic interaction between them should be considered [1]. Using the sol-gel method, between organic or inorganic coatings employed such as polymers, dextran, chitosan and silica, silica is easier to prepare when metal alkoxides are used as precursors [10,11] 3 as starting materials formed γ-Fe 2 O 3 for heat treatment less than 900 °C and α-Fe 2 O 3 at higher temperature [2]. However, the introduction of magnetic nanoparticles into the silica matrix resulted in a reduction of net magnetization.…”