Synthesis of high saturation magnetic iron oxide nanomaterials via low temperature hydrothermal method

Precisely Tuning the Contrast Properties of ZnxFe3–xO4 Nanoparticles in Magnetic Resonance Imaging by Controlling Their Doping Content and Size

“…In Figure a, we illustrate the X-ray diffraction patterns for Zn x Fe 3– x O 4 ( x = 0/0.1/0.2/0.3/0.4) under 2θ values ranging from 20 to 80°. We can observe here that the occurring peaks are contributed from the indexed crystal planes, (220), (311), (400), (422), (511), and (440), respectively, and the diffraction peaks of Zn x Fe 3– x O 4 ( x = 0.1/0.2/0.3/0.4) are similar to those of pure Fe 3 O 4 , indicating that all of these samples have a crystal unit with face-centered cubic inverse spinel structure. ,− To check the peak displacement by changing x , as shown in Figure b, the strongest diffraction peak is selected from the (311) plane in 2θ ranging from 34 to 37° to study the structure change of the crystal unit. Taking the (311) peak of Fe 3 O 4 as the baseline, we can notice that with the increase of x , the (311) peak tends to shift to a lower angle.…”

Polydopamine-Coated Magnetic Iron Oxide Nanoparticles: From Design to Applications

“…Chemical methods involve, on the contrary, bottom-up approaches, since they use molecular precursors to synthetize nanocrystals. Chemical methods for the synthesis of high-quality magnetic nanoparticles include co-precipitation [ 19 ], microemulsion [ 20 ], hydrothermal treatment [ 21 ], and thermal decomposition in the presence of molecular precursors [ 22 ]. The co-precipitation method is extensively used for the synthesis of MNPs, with a good control on size and magnetic properties for biomedical applications.…”

“…For example, Zheng et al [ 23 ] have reported the hydrothermal synthesis of Fe 3 O 4 NPs in the presence of sodium bis (2-ethylhexyl) sulfosuccinate as surfactant. The main disadvantage associated with this synthetic route is that nanoparticles smaller than 10 nm in size cannot be obtained [ 21 ]. Among the various chemical methods used for the fabrication of MNPs, the thermal decomposition of organometallic precursors in the presence of stabilizing agents such as surfactants best allows the synthesis of inorganic nanoparticles in a wide range of composition, including oxides, metals, and semiconductors, with a good control of their size, shape, size dispersion, crystallinity, and, accordingly, the resulting physicochemical properties.…”

Flintstone as a nanocomposite material for photonics

“…In particular, there is a change in the following properties: mechanical -increased solidity in combination with high plasticity; electrical -small particles becoming semiconductors; magnetic -extreme dependence of magnetic properties on the particle size, with the transition to superparamagnetism; thermallowered sintering temperatures, changed temperatures of polymorphic transformations due to high proportion of the liquid-like nonautonomous phase; optical -changed radiation and absorption spectra; chemical -increased reactivity, etc. [115,[201][202][203][204][205][206][207][208][209][210][211][212][213][214][215][216]. As follows from the findings of a number of studies on the nanocrystals formation, their structure and properties are often governed by the chemical and thermal background of the original compositions and by the their formation mechanism [59,95,[97][98][99][119][120][121].…”