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Preparation of GdCaAl3O7 : Eu nanoparticles by a combustion method and their characterization
Sousan Rasouli,Amir M. Arabi,Saeideh Gorji Kandi 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.1
GdCaAl3O7 : Eu nanoparticles were synthesized using a metal nitrate solution with glycine as fuel. X-ray diffraction (XRD), a scanning electron microscope (SEM), a transmission electron microscope (TEM) and a photoluminescence spectrophotometer (PL) were used to characterize the products obtained. XRD patterns revealed that a pure GdCaAl3O7 : Eu phase was formed by combustion of the metal nitrate solution in the presence of glycine at pH = 4. The appearance of spongy agglomerates indicates large amounts of exhaust gases and intense ignition of the powder obtained. SEM and TEM images showed that the agglomerates consisted of nanoparticles and 5-10 nm nanopores. An investigation of the chromaticity of the synthesized naophosphors showed that all samples synthesized at pH = 1 (after calcination), pH = 3 and pH = 4 have a red emission under 245 nm UV lighting. Furthermore, the synthesized sample at pH = 1 (after calcination) and the sample synthesized at pH = 4have almost the same CIE chromaticity xy values.
Synthesis and application of lead telluride nanoparticles for degrediation of organic pollution
Sousan Gholamrezaei,Masoud Salavati-Niasari,Davood Ghanbari 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
PbTe nanoparticles were achieved from reaction of Pb(NO)3 and TeCl4 (as a new precursor for Tellur) in arelatively short time and low temperature in a hydrothermal process. The photocatalytic behavior ofnanoparticles was evaluated using the degradation of a methyl orange (MeO) aqueous solution (as anorganic pollution) under ultraviolet (UV) light irradiation. The results confirm that nanoparticles arepromising materials with excellent performance in photocatalytic applications. In addition to,observations suggest that the as-obtained PbTe nanoparticles exhibit a strong PL peak at roomtemperature that might be ascribed to the high level transition in the PbTe semiconductor.
Effects of phylloquinone supplementation on lipid profile in women with rheumatoid arthritis
Sousan Kolahi,Bahram Pourghassem Gargari,Mehran Mesgari Abbasi,Mohammad Asghari Jafarabadi,Neda Ghamarzad Shishavan 한국영양학회 2015 Nutrition Research and Practice Vol.9 No.2
BACKGROUND/OBJECTIVES: Rheumatoid arthritis (RA) is associated with an excess mortality from cardiovascular disease which is likely attributed to an atherogenic lipid profile. Among nutritional factors vitamin K has been recently focused as a pivotal nutrient in improvement of lipid related markers. Thus, this study was designed to determine the effects of vitamin K on lipid profile in this disease. SUBJECTS/METHODS: Fifty eight patients with definitive RA were participated in the present double blind placebo controlled study. They were randomly allocated into two groups to receive vitamin K1 as phylloquinone [10 mg/day] (n = 30) or placebo pills (n = 28), for eight weeks. In order to control the effects of probable confounders dietary intakes, anthropometric measurements including weight and height, clinical status using disease activity score-28 (DAS-28), physical activity and anxiety status were evaluated at baseline. Moreover, serum levels of lipid related markers including total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C) and triglyceride (TG) were measured at baseline and at the end of intervention. RESULTS: There were no significant differences between the two groups regarding any of the baseline characteristics. After adjusting for some relevant confounders, in comparison between two groups, we observed no significant changes in lipid related markers at the end of intervention. Also, there was no significant difference between before and after intervention values within groups (P > 0.05). CONCLUSIONS: Function of vitamin K1 in lipid profile modification remains still controversial. This study showed that vitamin K1 has no effect on lipid profile in women with rheumatoid arthritis. Further studies with a longer follow-up are required to determine the effects of vitamin K on atherogenic lipid profile.
Sousan Rasouli 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.4
Field flow fractionation is a family of separation techniques applicable to characterize various particulate materials of different nature. In this paper, formation of porous graphite during milling has been investigated by gravitational field flow fractionation. The results from gravitational field flow fractionation were compared to those from Brunauer-Emmett-Teller. The both techniques have shown that particles fracturing and formation of porous graphite was occurred until 50 h milling. Further milling resulted in formation of agglomerated species. There was a good accordance between the results obtained from gravitational field flow fractionation, Brunauer-Emmett-Teller and scanning electron microscopy. Moreover, fractions of porous and non-porous species could be separated by gravitational field flow fractionation technique. Results demonstrated that gravitational field flow fractionation is a simple method with satisfactory results to investigate the evolution of graphite powder during milling process.
A facile hydrothermal method for synthesis different morphologies of PbTe nanostructures
Sousan Gholamrezaei,Masoud Salavati-Niasari,Davood Ghanbari 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Various morphologies of PbTe nanostructures were synthesized via a simple hydrothermal reaction. The effect of presence different surfactants such as anionic, cationic, and polymeric on the morphology and purity of the products was investigated. Results show that the as-obtained PbTe nanostructures show a strong photoluminescence peak at 402 nm at room temperature; also optical absorption spectrum of PbTe nanostructures exhibit an extreme blue-shift, which is attributed to the quantum confinement of charge carriers in the nanostructures. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, photoluminescence spectroscopy, UV–visible and Fourier transformed infrared spectroscopy were used to characterize the as-produced PbTe nanostructures.
Microwave-assisted gel combustion synthesis of ZnO-Co nano-pigments
Sousan Rasouli,Mahdiar Valefi,Shirin Jebeli Moeen,Amir Masoud Arabi 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.4
ZnO-Co ceramic pigments have been prepared by microwave-assisted gel combustion of zinc-nitrate-nitrate cobalt-citric acid precursors calcined at 700 to 1000 oC. The Combustion process has been investigated using thermal analysis and Fourier transformation infrared spectroscopy. X-ray diffraction, diffuse reflectance and scanning-transition electron microscopy was used to characterize the pigments. Results were compared with a solid state reaction. It was demonstrated that powders synthesis by combustion caused 200 oC reduction in the calcination temperature compared with the solid state reaction. The results demonstrated that the microwave-assisted combustion reaction was very simple and rapid to prepare 27-37.2 nm nanocrystalline pigments. Colorimetric results also indicated a broad reflectance band around 540 nm (green region) for all samples. It was deduced that the fuel-rich sample has more chromaticity and has a deeper green color.
Sousan Rasouli,Fatemeh Oshani,Seyed Masoud Hashemi 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.2
TiO2 nanosheets were synthesized by a combustion method using a metal nitrate solution combustion and urea fuel. Microwave irradiation was used as the heating source. X-ray diffraction, scanning and transmission electron microscopy as well as specific surface area analysis and Fourier transform infrared spectroscopy were performed to characterize the samples obtained. X-ray diffraction patterns revealed that the ratio of rutile/anatase phases varied from 25/75 to 69/31 as the fuel-tooxidizer (i.e. urea/titanyl nitrate) ratio changed from lean to rich. The crystallite size of the as-synthesized samples calculated by the Scherrer formula was 6.5-63 nm. From scanning and transmission microscopy images flaky particles with loose packed agglomerates in the form of nanosheets were detected. Due to the smaller crystallite size and higher content of the anatase phase, the fuel lean sample seemed to be a better candidate for photo-catalytic functions. TiO2 nanosheets were synthesized by a combustion method using a metal nitrate solution combustion and urea fuel. Microwave irradiation was used as the heating source. X-ray diffraction, scanning and transmission electron microscopy as well as specific surface area analysis and Fourier transform infrared spectroscopy were performed to characterize the samples obtained. X-ray diffraction patterns revealed that the ratio of rutile/anatase phases varied from 25/75 to 69/31 as the fuel-tooxidizer (i.e. urea/titanyl nitrate) ratio changed from lean to rich. The crystallite size of the as-synthesized samples calculated by the Scherrer formula was 6.5-63 nm. From scanning and transmission microscopy images flaky particles with loose packed agglomerates in the form of nanosheets were detected. Due to the smaller crystallite size and higher content of the anatase phase, the fuel lean sample seemed to be a better candidate for photo-catalytic functions.
Sousan Rasouli 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.6
In the present study, cobalt-doped ZnO nano pigments were synthesized by a solution gel combustion method using glycine fuel. A chamber furnace and microwave irradiation were used as heating sources. Products were characterized by X-ray diffraction, scanning-transmission electron microscopy and diffuse reflectance. The anticorrosive properties of the pigments obtained were investigated by electrochemical impedance spectroscopy. The results have shown that using glycine as the fuel pure ZnO phase was obtained directly by the two heating sources. Electron microscopy demonstrated quasi-spherical particles with a crystallite size of 49 nm for furnace-assisted and rod-like particles of 63 nm for the microwave-assisted procedure were obtained. The corrosion performance of the coating in 3% w/V NaCl solution was evaluated by electrochemical impedance spectroscopy (EIS) and polarization measurements. According to the measurements of EIS and electrochemical polarization,the coatings with a furnace-assisted pigment showed a higher corrosion resistance.