Effect of calcinations temperature on the structure of Cr&lt;inf&gt;2&lt;/inf&gt;O&lt;inf&gt;3&lt;/inf&gt; nanoparticles prepared by novel solvent free synthesis

Meenambika, R.; Ramalingom, S.; Thanu, T. Chithambara

doi:10.1109/icanmeet.2013.6609303

Cited by 3 publications

(4 citation statements)

References 17 publications

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“…Cr 2 O 3 thin films have been prepared by a variety of techniques, among which there can be mentioned microwave irradiation [13], Solvent Free Method [14], precipitation [15,16], photosynthesis method [17], solution based chemical method [18], Green Synthesis [19], hydrothermal method [20], thermal evaporation [21], solid thermal decomposition [22], electron-beam evaporation [23], flame fusion method [3] and sol -gel method [24]. Recently, the sol-gel process has emerged as one of the best methods for the synthesis of metal oxide materials with particularly important properties [25].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films

Zekaik

Benhebal

Benrabah

2019

High Temperature Materials and Processes

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Cu-doped Cr2O3 thin films were deposited onto glass substrate by the sol–gel dip-coating (SGDC) process using dopant values of 0, 3, 6, 9 and 12%. The Chromium (III) Nitrate Nonahydrate [Cr(NO3)3·9H2O] was used as a Cr source, whilst for the dopant, the corresponding nitrate (Cu(NO3)2) was used. The crystal structure, as well as the optical and electrical properties were examined. XRD data showed that the films with a high degree of crystallinity were rhombohedral Cr2O3 phase. The crystallite size reduces with increase in Cu doping proportion. The AFM results indicate a decrease in the surface roughness of the doped Cr2O3: Cu thin films. The UV-Vis spectra of the Cu doped-Cr2O3 films showed high transparency in the visible region. The optical band gap of Cr2O3 thin films decreases with increasing in Cu doping rate. The Nyquist plot shows that the equivalent circuit of Cu doped-Cr2O3 films is a parallel circuit RpCp. As the concentration of Cu increases, Resistance RP regresses while capacitance Cp increases.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films

Zekaik

Benhebal

Benrabah

2019

High Temperature Materials and Processes

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“…To ensure the complete formation of crystallized Cr 2 O 3 , the catalyst was calcined in air at 500 °C. Unfortunately, as reported, the calcination at 400 °C led to the increase in the particle size by more than 50% [23]. In addition, the pre-fluorination by CHClF 2 before reaction also results in the partial coke deposition.…”

Section: Introductionmentioning

confidence: 87%

Solution Combustion Synthesis of Cr2O3 Nanoparticles and the Catalytic Performance for Dehydrofluorination of 1,1,1,3,3-Pentafluoropropane to 1,3,3,3-Tetrafluoropropene

Wang

Han

et al. 2019

Molecules

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Cr2O3 nanoparticles were prepared by solution combustion synthesis (SCS) with chromium nitrate as the precursor and glycine as the fuel. Commercial Cr2O3 and Cr2O3 prepared by a precipitation method were also included for comparison. The morphology, structure, acidity and particle size of fresh and spent Cr2O3 catalysts were investigated by techniques such as XRD, SEM, TEM, BET and NH3-TPD. In addition, catalytic performance was evaluated for the dehydrofluorination of 1,1,1,3,3-pentafluoropropane (CF3CH2CHF2, HFC-245fa) to 1,3,3,3-tetra-fluoropropene (CF3CH=CHF, HFO-1234ze). The catalytic reaction rate of Cr2O3 prepared by SCS method is as high as 6 mmol/h/g, which is about 1.5 times and 2 times higher than that of precipitated Cr2O3 and commercial Cr2O3, respectively. The selectivity to HFO-1234ze for all the catalysts maintains at about 80%. Compared with commercial and precipitated Cr2O3, Cr2O3-SCS prepared by SCS possesses higher specific surface area and acid amount. Furthermore, significant change in the crystal size of Cr2O3 prepared by SCS after reaction was not detected, indicating high resistance to sintering.

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“…Structural, magnetic, and morphological properties of Cr 2 O 3 nanoparticles have been studied by several authors. 3,4 With the continuous development in the field of polymer modifications, considerable interest has grown toward irradiation of polymers with one of the most common ionizing radiation life gamma rays. This process produces a specific damage known as chemical bond scission forming very reactive intermediates, free radicals, ions, and excited states.…”

Section: Introductionmentioning

confidence: 99%

“…Nanoparticles of chromium oxide (Cr 2 O 3 ) are widely used in many fields serving as catalysts, wear resistance materials, and advanced colorants. Structural, magnetic, and morphological properties of Cr 2 O 3 nanoparticles have been studied by several authors . With the continuous development in the field of polymer modifications, considerable interest has grown toward irradiation of polymers with one of the most common ionizing radiation life gamma rays.…”

Section: Introductionmentioning

confidence: 99%

Structural and Optical Modifications in Polyvinyl Alcohol Due to Cr₂O₃ Nanoparticles Additives Concentration, and Gamma Irradiation

2015

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Nanosized chromium oxide Cr 2 O 3 was prepared and mixed with polyvinyl alcohol (PVA) to produce nanocomposite films. X-ray diffraction (XRD) and transmission electron microscopy were performed to study the crystallinity and size of nano-Cr 2 O 3 . Based on the results, the average particle size of the Cr 2 O 3 was found to be 29 nm. The effects of nanosized chromium oxide Cr 2 O 3 concentration and gamma dose on the structural and optical properties of PVA have been studied. The resultant effect of Cr 2 O 3 concentration on the properties of PVA has been investigated using XRD and UV spectroscopy. The results reveal that the addition of Cr 2 O 3 to PVA up to 0.80% leads to a more compact structure of PVA, resulted in an improvement in the isotropic nature of the polymer samples due to the increase in the refractive index. In addition, the effect of gamma irradiation on the 0.50% Cr 2 O 3 /PVA nanocomposite has been investigated. Samples from the 0.50% Cr 2 O 3 nanocomposite were irradiated with gamma doses in the range 200-1 kGy. It is found that the irradiation in the dose range 200-800 Gy causes cross-linking that increases the amorphous regions and gives polymer resilience. C

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Effect of calcinations temperature on the structure of Cr<inf>2</inf>O<inf>3</inf> nanoparticles prepared by novel solvent free synthesis

Cited by 3 publications

References 17 publications

Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films

Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films

Solution Combustion Synthesis of Cr2O3 Nanoparticles and the Catalytic Performance for Dehydrofluorination of 1,1,1,3,3-Pentafluoropropane to 1,3,3,3-Tetrafluoropropene

Structural and Optical Modifications in Polyvinyl Alcohol Due to Cr₂O₃ Nanoparticles Additives Concentration, and Gamma Irradiation

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Effect of calcinations temperature on the structure of Cr<inf>2</inf>O<inf>3</inf> nanoparticles prepared by novel solvent free synthesis

Cited by 3 publications

References 17 publications

Synthesis and characterization of Cu doped chromium oxide (Cr2O3) thin films

Synthesis and characterization of Cu doped chromium oxide (Cr2O3) thin films

Solution Combustion Synthesis of Cr2O3 Nanoparticles and the Catalytic Performance for Dehydrofluorination of 1,1,1,3,3-Pentafluoropropane to 1,3,3,3-Tetrafluoropropene

Structural and Optical Modifications in Polyvinyl Alcohol Due to Cr2O3 Nanoparticles Additives Concentration, and Gamma Irradiation

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Product

Resources

About

Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films

Synthesis and characterization of Cu doped chromium oxide (Cr₂O₃) thin films

Structural and Optical Modifications in Polyvinyl Alcohol Due to Cr₂O₃ Nanoparticles Additives Concentration, and Gamma Irradiation