Filament Temperature Dependence of the Nano-size MgO Particles Prepared by the HWCVD Technique

Borghei, Seyed Majid; Kamali, Samira; Shakib, Mohammad Homayoon; Bazrafshan, Arezoo; Ghoranneviss, M.

doi:10.1007/s10894-011-9394-3

Cited by 15 publications

(2 citation statements)

References 25 publications

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“…The peak at~2376 cm À1 arises due to absorption of atmospheric CO 2 on the metallic cations. Also, the absorption at~3445 cm À1 indicates the presence of hydroxyl groups (OeH mode), which was probably due to the fact that the spectra was not recorded in situ and some water re-adsorption from the ambient atmosphere as occurred (Selvamani, Yagyu, Kawasaki, & Mukhopadhyay, 2010, Borghei, Kamali, Shakib, Bazrafshan, & Ghoranneviss, 2011.…”

Section: Resultsmentioning

confidence: 99%

Luminescence properties of MgO: Fe3+ nanopowders for WLEDs under NUV excitation prepared via propellant combustion route

Devaraja

Avadhani²,

Nagabhushana

et al. 2015

Journal of Radiation Research and Applied Sciences

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PhosphorPhotoluminescence CCT CIE Co-ordinates a b s t r a c t Nanoparticles of Fe 3þ doped (0e9 mol %) MgO were prepared using low temperature (400 C) solution combustion technique using glycine as fuel. The powder X-ray diffraction (PXRD) patterns of the as-formed product exhibit cubic phase without further calcination.The effect of Fe 3þ ions on luminescence properties of MgO was studied and results were discussed in detail. The phosphors exhibit strong red emission upon 378 nm ( 6 A 1 ( 6 S) / 4 E( 4 G)) excitation. The characteristic photoluminescence (PL) peaks recorded at 513, 618 and 720 nm were attributed to transition of 4E þ 4 A 1 ( 4 G)/ 6 A 1 ( 6 S), 4 T 2 (4G)/ 6 A 1 (6S), 4 T 1 (4G)/ 6 A 1 (6S) respectively. Further, the sample exhibit strong red emission at 720 nm, as a result the phosphor was useful for the applications for (NUV) excitation. The intensity of red emission was attributed to intrinsic defects, especially oxygen-vacancies, which could assist the energy transfer from the MgO host to the Fe 3þ ions. The Commission International De I-Eclairage chromaticity co-ordinates were calculated from emission spectra and the values (x,y) were very close to National Television System Committee standard value of white emission. Therefore, the present phosphor was highly useful for display applications.

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Section: Resultsmentioning

confidence: 99%

Luminescence properties of MgO: Fe3+ nanopowders for WLEDs under NUV excitation prepared via propellant combustion route

Devaraja

Avadhani²,

Nagabhushana

et al. 2015

Journal of Radiation Research and Applied Sciences

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“…The peaks appeared at 1532 and 1108 cm -1 can be ascribed to the carboxyl (-COOH) and C-O functional groups, respectively [39,51]. The peaks at 1000, 850 and 453 cm -1 are related to the Mg-O absorption, MgO stretching (ν1) and stretching band (ν2) of MgO, respectively [52][53][54][55]. The peak appeared at 545 cm -1 is due to the stretching vibration of Zn-O [56].…”

Section: Phase Structure Analysismentioning

confidence: 98%

Removal of Congo Red from Wastewater Using ZnO/MgO Nanocomposites as Adsorbents: Equilibrium Isotherm Analyses, Kinetics and Thermodynamic Studies

Wang

Tang

Gao

et al. 2023

JNanoR

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One step polyacrylamide gel method was used to synthesize the ZnO/MgO adsorbents and the adsorption behavior with Congo red (CR) from wastewater was extensively investigated. Various advanced techniques were applied to confirm the ZnO/MgO adsorbents consist of Zn, C, Mg and O elements and do not contain any other impurity elements. With the increase of MgO content, the morphology of ZnO/MgO adsorbent changes from the agglomeration of large particles to evenly dispersed fine particles and then to icicle structure. Results demonstrated that the adsorption process of ZnO/MgO adsorbents was significantly affected by the change in initial dye solution pH, initial adsorbent dosage, contact time and reaction temperature. The optimum pH, adsorbent dosage, contact time and reaction temperature is 9.81, 2 g /L, 65 min and 293 K, respectively. The maximum adsorption capacity of ZnO/MgO (nZnO:nMgO = 8:2) adsorbents (295.138 mg/g) for the adsorption of CR dye was approximately double that of previous reports (125 mg/g). The adsorption equilibrium data are well fitted by the Freundlich and Langmuir isotherm models. Thermodynamic studies indicate that the adsorption process of ZnO/MgO adsorbents is an exothermic process. Based on the experimental and theoretical analysis, the adsorption mechanism for the ZnO/MgO adsorbents consisted of hydrogen bonding, n-π interaction and electrostatic interaction. The present work pioneers the potential application of ZnO/MgO adsorbents for the adsorption of CR dye and further provides experimental evidence for the synthesis of other adsorbents.

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Metal Oxide Nanoparticles

Fernández-García¹,

Rodgriguez²

2017

Design of Nanostructures

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This chapter covers the fundamental science, synthesis, characterization, physicochemical properties and applications of oxide nanomaterials. Explains fundamental aspects that determine the growth and behavior of these systems, briefly examines synthetic procedures using bottom-up and top-down fabrication technologies, discusses the sophisticated experimental techniques and state of the art theory results used to characterize the physico-chemical properties of oxide solids and describe the current knowledge concerning key oxide materials with important technological applications.

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Filament Temperature Dependence of the Nano-size MgO Particles Prepared by the HWCVD Technique

Cited by 15 publications

References 25 publications

Luminescence properties of MgO: Fe3+ nanopowders for WLEDs under NUV excitation prepared via propellant combustion route

Luminescence properties of MgO: Fe3+ nanopowders for WLEDs under NUV excitation prepared via propellant combustion route

Removal of Congo Red from Wastewater Using ZnO/MgO Nanocomposites as Adsorbents: Equilibrium Isotherm Analyses, Kinetics and Thermodynamic Studies

Metal Oxide Nanoparticles

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