Abstract:Nanopowders of single-crystalline rod-like magnetite have been synthesized in a glycerol-water system under hydrothermal condition by using the goethite (α-FeOOH) precursor. The influence of different reaction parameters on the morphology and composition of the products have been investigated. The structure, morphology and magnetic properties of the products were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM) and superconduc… Show more
“…observed lattice spacing of 0.298 nm, which match well with the (220) lattice planes and confirmed that the nanorods grew along (110) direction [50,42]. Fig.…”
Section: Wang Et Al Observed a Lattice Spacing Of 048 Nm For Fe3o4 supporting
confidence: 68%
“…Crystallography of Fe3O4 naanoparticles are inverse-spinel crystal with face-centered cubic, structures (Fd3m space group) [41]. Several work have reported the elongation of magnetite iron oxide crystal based on (110) plan [42][43][44], (100) plan [45,46], and (111) plan [47,48], which formed nanorods morphology.…”
Section: Proposed Formation Mechanism Of Nanoparticles With Differentmentioning
Graphical abstract2 ABSTRACT A novel one-pot method was developed in this work to synthesize and disperse nanoparticles in a binary base fluid. As an example, stable magnetite iron oxide (Fe3O4) dispersions, i.e., nanofluids, were produced in a high ionic media of binary lithium bromide-water using a microemulsion-mediated method. The effects of temperature and precursor concentration on morphology and size distribution of produced nanoparticles were evaluated. An effective steric repulsion force was provided by the surface functionalization of nanoparticles during the phase transfer, supported by the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. The formed nanoparticles exhibited a superior stability against agglomeration in the presence of high concentrations of lithium bromide, i.e., from 20 to 50 wt.%, which make them good candidates for a range of novel applications.
“…observed lattice spacing of 0.298 nm, which match well with the (220) lattice planes and confirmed that the nanorods grew along (110) direction [50,42]. Fig.…”
Section: Wang Et Al Observed a Lattice Spacing Of 048 Nm For Fe3o4 supporting
confidence: 68%
“…Crystallography of Fe3O4 naanoparticles are inverse-spinel crystal with face-centered cubic, structures (Fd3m space group) [41]. Several work have reported the elongation of magnetite iron oxide crystal based on (110) plan [42][43][44], (100) plan [45,46], and (111) plan [47,48], which formed nanorods morphology.…”
Section: Proposed Formation Mechanism Of Nanoparticles With Differentmentioning
Graphical abstract2 ABSTRACT A novel one-pot method was developed in this work to synthesize and disperse nanoparticles in a binary base fluid. As an example, stable magnetite iron oxide (Fe3O4) dispersions, i.e., nanofluids, were produced in a high ionic media of binary lithium bromide-water using a microemulsion-mediated method. The effects of temperature and precursor concentration on morphology and size distribution of produced nanoparticles were evaluated. An effective steric repulsion force was provided by the surface functionalization of nanoparticles during the phase transfer, supported by the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. The formed nanoparticles exhibited a superior stability against agglomeration in the presence of high concentrations of lithium bromide, i.e., from 20 to 50 wt.%, which make them good candidates for a range of novel applications.
“…3 ). The magnetization value of nanorod is much larger than the previous reported pure hematite alone [ 40 , 41 ], which could due to the ferromagnetic nature of magnetite, of which the magnetization in pure form can reach up to 100 emu/g [ 42 ]. Fig.…”
Background
Hyperthermia is one of the promising cancer treatment strategies enabled by local heating with the use of tumor-targeting magnetic nanoparticles (MNP) under a non-invasive magnetic field. However, one of the remaining challenges is how to achieve therapeutic levels of heat (without causing damages to regular tissues) in tumors that cannot be effectively treated with anti-tumor drug delivery.
Results
In this work, we report a facile method to fabricate magnetic nanorods for hyperthermia by one-step wet chemistry synthesis using 3-Aminopropyltrimethoxysilane (APTMS) as the shape-controlling agent and ferric and ferrous ions as precursors. By adjusting the concentration of APTMS, hydrothermal reaction time, ratios of ferric to ferrous ions, magnetic nanorods with aspect ratios ranging from 4.4 to 7.6 have been produced. At the clinically recommended field strength of 300 Oe (or less) and the frequency of 184 kHz, the specific absorption rate (SAR) of these nanorods is approximately 50 % higher than that of commercial Bionized NanoFerrite particles.
Conclusions
This increase in SAR, especially at low field strengths, is crucial for treating deep tumors, such as pancreatic and rectal cancers, by avoiding the generation of harmful eddy current heating in normal tissues.
“…[48][49][50]. The aqueous co-precipitation of Fe 2+ and Fe 3+ by a base, usually sodium hydroxide or aqueous ammonia, is the well-known method which is usually carried out for synthesizing the magnetite nanoparticle [51]. This method is the most scalable chemical synthesis routes which results in iron oxide nanospherical crystal.…”
Nanorods are nanostructures that are the object of fundamental and applied research. They may be prepared from carbon, gold, zinc oxide, and many other materials. They are bigger than individual atoms (measured in angstroms, 1Å=10 À10 m) and also than small molecules. The turning point for nanomaterials research was the discovery of carbon nanotubes in 1991. Their mechanical, electrical, and optical properties depend upon their size, allowing for multiple applications. Also, nanorods may be functionalized for different applications. In this Chapter, the methods of synthesis and analysis, and the applications of carbon, zinc oxide, gold, and magnetic nanorods are reviewed.
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