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RISS 인기검색어
- 검색키워드
- 저자 : Shahram Moradi Dehaghi (검색결과 4 건)
- 무료
- 기관 내 무료
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Evaluation of Eu/Dy ratio on Nd-doped SrAl2O4 and their role on luminescence properties
Seyed Mohsen Mousavi,Shahram Moradi Dehaghi 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.3
The purpose of this study was production of photoluminescent pigments by adding different ratios of Eu/Dy to SrAl2O4: Nd3+composites. Presence of Eu and Dy in the pigments, alone or together causes varying fluorescence and phosphorescenceproperties regarding their emission intensity and afterglow length. The resulted differences in morphology and crystalstructure of these pigments were measured by spectroscopic methods. The interesting fact in this work is the emission typeof the pigments before and after the reduction process; as the pigments were white powders showing strong red emission underUV irradiation and after the reduction process, they showed strongly visible afterglows. Six samples with different Eu/Dyratios were synthesized and named samples N1 to N6. They underwent the thermal reduction process and the resultingsamples were named N1A to N6A. The phosphorescence analysis showed an intensity count of 518 for sample N6A, thefluorescence showed an intensity of 797 counts for sample N6A, and the sample N4A showed an afterglow time of about 5 hwith a strong initial afterglow of about 20 minutes.
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Surfactant effect on synthesize of BaAl2O4 nanoparticles prepared by reverse micelle process
Azita Moheb,Saeid Abedini Khorramie,Shahram Moradi Dehaghi 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.3
Barium aluminate (BaAl2O4) spinel nanoparticles were prepared by a reverse micelle method using micro-reactors made ofdifferent nonionic surfactants (Span 20, Span 40 and Span 60) in a nonpolar solvent benzene. The synthesized nanomaterialswere characterized by X-ray diffraction (XRD) technique. The morphology of the synthesized materials was studied by fieldemission scanning electron microscope (FESEM). Particle size was estimated by XRD and transmission electron microscope(TEM) with using software of ImageJ. The effect of different surfactants on the particles size and morphology was determined. The results revealed, that particle size was increased by decreasing HLB (Hydrophilic-Lipophilic Balance) of surfactants andalso particle size was increased from 23 to 35 nm. HLB of surfactants is a major factor in controlling the final particles sizeof BaAl2O4 powder. The X-ray powder diffraction analysis indicated, all the formation of hexagonal phase on calcinations. Dislocation of peaks (2θ) in XRD with decreasing HLB of surfactant was decreased slightly.
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Surfactant effect on synthesize of SrAl2O4 nanoparticles prepared by reverse micelle process
Azita Moheb,Saeid Abedini Khorramie,Shahram Moradi Dehaghi 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.2
Strontium aluminate (SrAl2O4) spinel nanoparticles were synthesized by microemulsion method using micro-reactors made ofdifferent nonionic surfactants (Span 20, Span 40 and Span 60) in a nonpolar solvent cyclohexane. The synthesizednanomaterials were characterized by X-ray diffraction (XRD) technique. The morphology of the synthesized materials wasstudied by field emission scanning electron microscope (FESEM). The average particles size was estimated by XRD andtransmission electron microscope (TEM) with using software of IMAGE J. The effect of different surfactants on the particlessize and morphology was determined. It was found that the average particles size was decreased by decreasing HLB(Hydrophilic-Lipophilic Balance) of surfactants and also the average particles size was decreased from 31 to 21 nm. HLB ofsurfactants is a major factor in controlling the final particles size of SrAl2O4 powder. Dislocation of peaks (2θ) in XRD withdecreasing HLB of surfactant was decreased slightly. The XRD analysis of all the powders indicated the formation of singlephasespinel structure on calcinations.
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Rouhollah Soltani Goharrizi,Lobat Taghavi,Amir Sarrafi,Abdolreza Karbasi,Shahram Moradi Dehaghi 한국자기학회 2018 Journal of Magnetics Vol.23 No.2
Bentonite is a kind of crystalline clay mineral with the major constituent of montmorillonite. Bentonite mines should be investigated in different areas with different climatic and environmental conditions. Kerman, is a province in the southeast of Iran famous for its rich resources of bentonite mines. In the present study, the physical and chemical characteristics of the supplied bentonites from three different mines of Kerman (Kheirabad, Tang-e Quchan and Horjand) were investigated. Kheirabad sodium bentonite sample was selected as a potent adsorbent of organic and inorganic pollutants due to high swelling index. Besides, magnetite nano composites were synthesized by stabilizing Fe₃O₄ nanoparticles on desired bentonite. The properties of nanocomposites were studied using FTIR, XRD, VSM, BET and TEM analyses.
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