Synthesis and Characterisation of Rod-Like Magnetic Nanoparticles (original) (raw)
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Variety of experimental tools have been used for characterization of morphology of magnetic nanoparticles in colloid suspensions. Ferric oxide particles of sizes between 5 and 20 nm have been prepared by different methods, aqueous co-precipitation of ferrous salts, thermal decomposition of metal complexes in organic solvents, and using mechanical milling of micron sized particles. They were covered by stabilizing layer of different surfactants and dispersed in organic solvents. The analysis and comparison of the collected data allowed to assess the performance of each technique and give recommendations for obtaining precise structural data for nanoparticles dispersions of the given size range.
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales, 2020
In the last decade, magnetic nanomaterials have been widely used in the fields of chemistry, physics, engineering, and medicine due to their optical, magnetic, and conductive properties, and as contrast agents in magnetic resonance. Their influence in the treatment of cancerous tumors has been evaluated and has sparked great interest in its use in environmental repair systems such as magnetic absorbers that trap metal particles and some contaminants. Here we analyze the influence of process parameters to obtain magnetic nanoparticles under three chemical synthesis methods. Its morphological characterization was performed by scanning electron microscopy (SEM), its elemental composition by energy dispersive spectroscopy (EDS), and its structure by x-ray diffraction (XRD). Our results showed that the obtention method had a great influence as evidenced by the variability in nanoparticle sizes. It is worth highlighting that we obtained particles at a nanometric scale, especially Fe3O4 (m...
Preparation and characterization of magnetic nanoparticles
Lambert publication , 2022
Magnetic nano particles have prime importance in the development of magnetic recorders, semi conducting devices, water treatment. The increasing in magnetization gives best result in environmental fields. In this study, prepared Ca(OH) 2, MgO, MnO 2 and Fe 2 O 3 nanoparticles in optimum size and shape. Fe 2 O 3 magnetic nanoparticle is doped with Titanium and magnesium to alter its magnetic nature towards paramagnetic from Ferromagnetic and also MnO 2 Magnetic nature altered towards ferromagnetic from Antiferromagnetic. In this study XRD is employed to identify the crystal structure and lattice arrangement of Ca(OH) 2, MgO, MnO 2 and Fe 2 O 3 doped with Ti and Mg shows trigonal, cubic, tetragonal and trigonal (rhombohedral) respectively. The atomic arrangement and magnetic symmetry are calculated for Ti doped Fe 2 O 3. It shows the magnetic symmetry of Ti doped Fe 2 O 3 is P4 3 32 normal Fe 2 O 3 shows R¯3 the change in the symmetry is due to the doping affect the lattice arrangement. In MnO 2 it shows I4/m' as magnetic symmetry. SEM analysis employs to confirm the nano particle size and shape of the nano particles. DLS employs to confirm the distribution of the nano particle, all nano particles are having PDI as 1 this shows all nano particles are mono dispersed. TEM is employed to find the accurate crystal structure of Fe 2 O 3 doped with Ti and Mg. The Ti doped Fe 2 O 3 is trigonal (rhombohedral) and the morphology is needle shape. SAED from TEM shows the molecular binding after doping and the additional lines in SAED confirm the doping exist in Fe 2 O 3 .VSM is employed to find the magnetization Ms=437. 90E-6 and coercivity as 79.787G of the particular nano particle and hysteresis graph shows the ferromagnetic nature of the MnO 2. XPS employs to confirm the atomic composition of the doped Fe 2 O 3 , Ti doped in 2p position at 17% and Mg doped in 1s position at 5% FTIR is employed to confirm the metal ligand bond in the nano particle the absorption at 555 cm-1 represent for MgO lattice, 621 cm-1 represent for MnO 2 stretching, 793 cm-1 , and 466 cm-1 represent for Fe-O and Ti respectively. DSG-TGA is employed to find out the melting point of the Fe 2 O 3 doped with Ti and Mg, after 1200 o C 38% and a 58 % sample remaining respectively. Then the prepared nano particle was used in water treatment, compared with conventional coagulant it gives better result. In phenolic effluent it gives 60% removal
Magnetic nanoparticles: preparation, structure and properties
Russian Chemical Reviews, 2005
The key methods for the preparation of magnetic nanoparticles are described systematically. The experimental data on their properties are analysed and generalised. The main theoretical views on the magnetism of nanoparticles are considered.
Journal of Experimental Nanoscience, 2020
In present study, nanosized iron oxides particles are synthetised by easy one step precipitation from Mohric salt (NH 4) 2 Fe(SO 4) 2 Á6H 2 O reacting with sodium hydroxide solution in temperature up to 60 C. When changing the time of reaction, the iron oxide particles of different shape are prepared and when drying wet extracted particles at elevated temperature of 60 C the change of 2D shaped morphology is observed. Depending on the time of reaction different ratios of FeOOH and Fe 3 O 4 are obtained in this study. DTA-TGA, XRD, FTIR and SEM are used for the characterisation of particles in this study.
Preparation and Properties of Various Magnetic Nanoparticles
Sensors, 2009
The fabrications of iron oxides nanoparticles using co-precipitation and gadolinium nanoparticles using water in oil microemulsion method are reported in this paper. Results of detailed phase analysis by XRD and Mössbauer spectroscopy are discussed. XRD analysis revealed that the crystallite size (mean coherence length) of iron oxides (mainly γ-Fe 2 O 3) in the Fe 2 O 3 sample was 30 nm, while in Fe 2 O 3 /SiO 2 where the ε-Fe 2 O 3 phase dominated it was only 14 nm. Gd/SiO 2 nanoparticles were found to be completely amorphous, according to XRD. The samples showed various shapes of hysteresis loops and different coercivities. Differences in the saturation magnetization (MS) correspond to the chemical and phase composition of the sample materials. However, we observed that MS was not reached in the case of Fe 2 O 3 /SiO 2 , while for Gd/SiO 2 sample the MS value was extremely low. Therefore we conclude that only unmodified Fe 2 O 3 nanoparticles are suitable for intended biosensing application in vitro (e.g. detection of viral nucleic acids) and the phase purification of this sample for this purpose is not necessary.
A REVIEW ON MAGNETIC NANOPARTICLES
This review shows the research on magnetic nanoparticles on their types of production, specific methods for preparing magnetic nanoparticles, Magnetic Properties, most widely encountered particles, stabilization of the particles and determination of the size by different methods, Substantial progress has been made for the preparation of magnetic nanoparticles, a major challenge is to find out the most efficient and economical one. At present ferrite nanoparticles and oxide nanoparticles are the most employed one. The application of this particle is vast subject as they can be embedded to all technical disciplines. Finally, the areas of application of these particles are highlighted.
Journal of Magnetism and Magnetic Materials, 2014
Different size of iron oxide nanoparticles were synthesized via hydrothermal process. The change of the size of nanoparticles with reaction temperatures (60, 100, 150, and 180°C) was investigated. To have further insight into the growth of nanoparticles, the different reaction times were also studied at the temperatures of 100, 150, and 180°C. The structural characterization was carried out with X-ray diffractometer and Fourier transform infrared spectroscopy. The nanoparticles were found to have high crystalline iron oxides with a mixture of magnetite and maghemite crystalline phases. With the increase of the nanoparticle size, the ratio of magnetite to maghemite phase increased and reached to a pure magnetite phase for the 123 ± 44 nm particles. When the reaction temperature increased from 100 to 180°C for 12 h, the size of the nanoparticles increased from 14.5 ± 4 to 29.9 ± 9 nm according to transmission electron microscopy analysis. At 180°C, as the reaction time increased from 1 to 48 h, the size of nanoparticles increased from 20.6 ± 6 to 123 ± 44 nm. This means that the reaction times are more effective on the growth of the nanoparticles at high temperatures. Magnetic analysis by vibrating sample magnetometer showed that the nanoparticles are ferrimagnetic. By considering all nanoparticles, the saturation magnetization increased as the size of the nanoparticle increased. And the high size of nanoparticles reached the high saturation magnetization value at low applied magnetic fields. The structural and magnetic properties of the nanoparticles are found to be depending on the nanoparticle sizes which are substantially affected by the reaction temperature and time.
Synthesis of magnetic nanoparticles via the sol-gel technique
MATERIALS SCIENCE-POLAND
Magnetic nanopowders have been prepared by the sol-gel method. The particles were characterized using nitrogen adsorption-desorption isotherms and SEM techniques. The properties of the magnetic nanopowders were characterized by 57 Fe Mössbauer absorption spectrometry and magnetization measurements.
Characterization and Chemical Stability of Hydrophilic and Hydrophobic Magnetic Nanoparticles
Materials Research
Magnetic nanoparticles can improve the efficiency of phase separation time in multi-stage operations when a magnetic field is present. As such operations involve contact with aqueous and/or organic solutions, hydrophilic magnetic nanoparticles synthesized through the co-precipitation method were functionalized with oleic acid to attain hydrophobic magnetic nanoparticles. Both nanoparticles were characterized morphologically, chemically and magnetically. The results revealed that the particles (size ≈ 10 nm) consisted of an iron oxide mixture of magnetite and maghemite. The functionalization with oleic acid was effective in converting them into hydrophobic nanoparticles. Both particles were ferro/ferrimagnetic and the presence of oleic acid did not interfere significantly in the saturation magnetization value. The chemical stability of both nanoparticles were also evaluated, as an attempt of simulating broad industrial conditions to which the nanoparticles may be subjected; the hydrophilic nanoparticles were resistant at pH ≥ 4, while the hydrophobic nanoparticles were stable at pH ≥ 3.