Preparation, characterization and optical properties ofα-Fe2O3 films by sol-spinning process

Chauhan, Pratima; Annapoorni, S.; Trikha, S. K.

doi:10.1007/bf02744922

Cited by 12 publications

(4 citation statements)

References 15 publications

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“…Iron oxide nano-particles were prepared by the sol-gel method using ferric nitrate (Fe(NO 3 ) 3 • 9H 2 O 99.99% purity, Aldrich Co.) as a precursor and 2-methoxy ethanol (C 3 H 8 O 2 ) as a solvent [28]. Polyaniline in emeraldine oxidation state in powder form was prepared via chemical oxidation of aniline monomer (Aldrich, reagent grade) with ammonium persulfate (NH 4 ) 2 S 2 O 8 (Aldrich reagent grade) in hydrochloric acid [29] Rigaku Rotaflex Diffratometer using Cu K α radiation (1.54 Å).…”

Section: Methodsmentioning

confidence: 99%

Alignment of magnetic clusters in polymer using Ar ion beam

Malik¹,

Sharma²,

Kanjilal³

et al. 2009

J. Phys. D: Appl. Phys.

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Free standing sheets of polyaniline and iron oxide (γ-Fe2O3)/polyaniline are synthesized by the solution casting method. The study describes the alignment of magnetic clusters in iron oxide/polyaniline nano-composite sheets using energetic argon (Ar) ions. The energy of the Ar ion was varied from 0.06 to 1.2 MeV and the fluence was varied from 1015 to 1017 ions cm−2. X-ray diffraction studies confirm that the single phase of γ-Fe2O3 has been retained in the composite sheets. The polyaniline free standing sheets do not show any structure. Clusters are observed in polyaniline/iron oxide nano-composite sheets using scanning electron microscopy. In addition to the dispersion of clusters, orientations of clusters have been observed. The observed increase in conductivity as a result of ion irradiation has been attributed to the formation of a carbonized phase and production of different chemical species. The magnetic properties of the composite samples, as a result of ion irradiation, remained unaffected.

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Section: Methodsmentioning

confidence: 99%

Alignment of magnetic clusters in polymer using Ar ion beam

Malik¹,

Sharma²,

Kanjilal³

et al. 2009

J. Phys. D: Appl. Phys.

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“…Maghemite nanoparticles were prepared using the sol-gel method using ferric nitrate (Fe(NO 3 ) 3 .9H 2 O) as the precursor and 2-methoxy ethanol as the solvent [5][6][7]. The powder obtained using this method was suspended in distilled water and stirred using a magnetic stirrer for 5 h. The above suspension was placed in a sonicator for 10 min.…”

Section: Methodsmentioning

confidence: 99%

“…The most commonly studied magnetic nanomaterials are the oxides, in the form of ferrites and substituted ferrites. They are prepared using various processes like hydrothermal precipitation, sol-gel, sonochemical methods, sputtering and electron beam evaporation [3][4][5][6]. Among the standard methods, the sol-gel method has the advantage of good composition control and a low processing temperature.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of polypyrrole-coated iron oxide nanoparticles

Sharma¹,

Lamba²,

Annapoorni³

2005

J. Phys. D: Appl. Phys.

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Iron oxide nanoparticles were prepared by sol -gel process. In-situ polymerization of pyrrole monomer in the presence of oxygen in iron oxide -ethanol suspension resulted in a iron-oxide polypyrrole nanocomposite. The structure and magnetic properties of the nanocomposites with varying pyrrole concentrations are investigated. The X-Ray diffraction studies indicate the presence of γ − F e 2 O 3 phase for the concentrations investigated. FTIR studies confirm the presence of polypyrrole. The TEM studies show agglomeration in uncoated samples and in samples with a lower concentration of polypyrrole. Agglomeration is much reduced for samples coated with higher concentration of polypyrrole. The ac susceptibility measurements performed in the temperature range 77 -300 K shows the presence of blocking, indicating the superparamagnetic phase. The blocking temperature is found to depend on the pyrrole concentration. Monte Carlo studies for an array of polydispersed single domain magnetic particles, based on an interacting random anisotropy model were also carried out and the blocking temperatures obtained from the simulation of the ZFC-FC magnetization compares favorably with experimental results.

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“…In the second method of preparation, the iron oxide nanoparticles prepared by sol-gel process 17 were dispersed in water:ethanol mixture in the ratio 1:2. About 0.2 ml ͑0.19 g͒ of pyrrole monomer was added to this in an ultrasonic bath followed by the addition of 4 ml of 0.4% polyvinyl alcohol ͑PVA͒ solution which acts as a binder.…”

Section: Synthesismentioning

confidence: 99%

Magnetic relaxation studies in organic-inorganic nanoclusters

Sharma

Suri

Tandon

et al. 2006

Journal of Applied Physics

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Inorganic/organic nanocomposites of iron oxide and polypyrrole, prepared by two different techniques, namely, simultaneous gelation/polymerization and polymerization over core iron oxide particles, were investigated for their structural and magnetic properties. The presence of the polymer was confirmed by Fourier transform infrared spectroscopy. The magnetic properties were found to be very sensitive not only to the concentration of polymer but also to the method of preparation. ac susceptibility measurements performed in the temperature range of 77-300 K show the signature of superparamagnetic behavior in both the systems. The blocking temperature was found to be dependent on the cluster size and interaction effects. The frequency variation of the blocking temperature in the samples prepared by simultaneous gelation and polymerization seems to indicate weakly interacting magnetic clusters, whereas in the samples prepared by polymerization around the core oxide particles, a strongly interacting signature is seen. ac susceptibility as calculated by kinetic Monte Carlo simulations based on an interacting model for single domain particles shows a qualitative agreement with the trends observed in the experimental results.

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Preparation, characterization and optical properties ofα-Fe2O3 films by sol-spinning process

Cited by 12 publications

References 15 publications

Alignment of magnetic clusters in polymer using Ar ion beam

Alignment of magnetic clusters in polymer using Ar ion beam

Magnetic properties of polypyrrole-coated iron oxide nanoparticles

Magnetic relaxation studies in organic-inorganic nanoclusters

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