Synthesis and Characterization of CoFe2O4 Nanoparticles by Glycothermal Process

2007 ◽  
Vol 544-545 ◽  
pp. 865-868 ◽  
Author(s):  
Chil Soon Lee ◽  
Dong Sik Bae
Keyword(s):  
Room Temperature ◽  
Cofe2o4 Nanoparticles ◽  
Synthesis Parameters ◽  
Metal Nitrates ◽  
Temperature And Pressure ◽  
Starting Solutions ◽  
Average Size ◽  
Glycol Solution ◽  
Mild Temperature

CoFe2O4 nanoparticles were prepared in ethylene glycol solution under mild temperature and pressure conditions by precipitation from metal nitrates. The average size of the synthesized CoFe2O4 nanoparticles was in the range of 5 to 10, and they were narrowly distributed in the crystalline phase. Their magnetic property was of superparamagnetic character at room temperature. The effect of synthesis parameters is discussed such as the pH of starting solutions and reaction temperature.

Synthesis and Characterization of Nanosized ZnxMn1-xFe2O4 Powders by Glycothermal Process

2005 ◽  
Vol 486-487 ◽  
pp. 436-439 ◽  
Author(s):  
Dong Sik Bae ◽  
Eun Jung Kim ◽  
Sang Whan Park ◽  
Kyong Sop Han
Keyword(s):  
Magnetic Property ◽  
Ethylene Glycol ◽  
Room Temperature ◽  
Synthesis And Characterization ◽  
Metal Nitrates ◽  
Temperature And Pressure ◽  
Average Size ◽  
Glycol Solution ◽  
Mild Temperature

Nanosized ZnxMn1-xFe2O4 powders were prepared in ethylene glycol solution under mild temperature and pressure conditions by precipitation from metal nitrates. The average size and distribution of the synthesized ZnxMn1-xFe2O4 powders were 10- 20 ㎚ and narrow, respectively. The magnetic property of the synthesized ZnxMn1- xFe2O4 powder was of superparamagnetic character at room temperature.

Synthesis and Characterization of Nanosized ITO Powders by Glycothermal Processing

2005 ◽  
Vol 486-487 ◽  
pp. 440-443
Author(s):  
Dong Sik Bae ◽  
Hye Kyoung Kim ◽  
Rak Hee Kim ◽  
Jae Won Kim ◽  
Je Hyun Lee ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Potassium Hydroxide ◽  
Oxide Powders ◽  
Metal Nitrates ◽  
Aqueous Potassium Hydroxide ◽  
Temperature And Pressure ◽  
Average Size ◽  
Glycol Solution ◽  
Mild Temperature

Nanosized ITO(indium tin oxide) powders were prepared in ethylene glycol solution under mild temperature and pressure conditions by precipitation from metal nitrates with aqueous potassium hydroxide. The average size and distribution of the synthesized ITO powders were about 20 ㎚ and broad, respectively. The phase of synthesized particles was crystalline reacted at 230 0C for 6 h.. The optical properties of the synthesized ITO powders were transparent.

Fabrication and Characterization of Barium Doped Ceria Nanopowders by a Solvothermal Processing

2016 ◽  
Vol 868 ◽  
pp. 84-88
Author(s):  
Dae Han Lee ◽  
Dong Sik Bae
Keyword(s):  
Ammonium Hydroxide ◽  
Cubic Phase ◽  
Solvent Ratio ◽  
Solution Ph ◽  
Starting Solution ◽  
Metal Nitrates ◽  
Temperature And Pressure ◽  
Average Size ◽  
Mild Temperature

Ba doped CeO2 nanopowders were prepared under mild temperature and pressure conditions by precipitation from metal nitrates with aqueous ammonium hydroxide. Spherical Ba doped CeO2 nanopowders were obtained with reaction at the temperature range of 210°C to 230°C for 6 h. The average size of the synthesized Ba doped CeO2 powders were below 10 nm and its distribution was narrow. The XRD pattern showed that the synthesized Ba doped CeO2 powders were crystalline with cubic phase of CeO2. This study has shown that the synthesis of Ba doped CeO2 nanopowders is possible under mild temperature and pressure conditions in ethylene gylcol solution. The effects of synthesis parameters, such as the solvent ratio of starting solution, pH of starting solution, reaction temperature and time, are discussed.

Synthesis and Characterization of Superparamagnetic NiFe2O4 Nanoparticles

2010 ◽  
Vol 663-665 ◽  
pp. 1325-1328 ◽  
Author(s):  
De Hui Sun ◽  
De Xin Sun ◽  
Yu Hao
Keyword(s):  
Room Temperature ◽  
Size Range ◽  
X Ray Diffraction ◽  
Inverse Spinel ◽  
Cubic Crystal ◽  
Xrd Pattern ◽  
X Ray ◽  
Nife2o4 Nanoparticles ◽  
Average Size

The superparamagnetic NiFe2O4 nanoparticles were synthesized using a hydrothermal technology through P123 sphere micelles as ‘nanoreactor’ in this work. Their morphologies, structures, surface properties and magnetism were characterized by FE-SEM, XRD, FTIR, and VSM, respectively. The nickel ferrite samples are nearly spherical and homogeneous nanoparticles with average size range of about 50-120 nm. They possess superparamagnetism at room temperature and higher saturation magnetization. X-ray diffraction (XRD) pattern confirms that the samples belong to the cubic crystal system with an inverse-spinel structure. Fourier transform infrared (FTIR) absorption spectrum indicates that the NiFe2O4 nanoparticles are stabilized by the P123 adsorbed on the surface of nanoparticles.

scholarly journals Preparation and Characterization of High Purity Anhydrous β-Lactose from α-Lactose Monohydrate at Mild Temperature

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Ana L. López-Pablos ◽  
César C. Leyva-Porras ◽  
Macrina B. Silva-Cázares ◽  
Francisco E. Longoria-Rodríguez ◽  
Sergio A. Pérez-García ◽  
...  
Keyword(s):  
Room Temperature ◽  
Alcoholic Solution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lactose Monohydrate ◽  
Diffraction Patterns ◽  
Mild Temperature ◽  
Dietary Food ◽  
Scanning Electron

Lactose is a disaccharide of importance in humans dietary, food products, and the pharmaceutical industry. From the existing isomeric forms, β-lactose is rarely found in nature. Thus, in this work, a simple methodology to obtain anhydrous β-lactose (βL) from α-lactose monohydrate (αL·H2O) is presented. The αL·H2O powder was dispersed into a basic alcoholic solution (72 hours), at controlled conditions of temperature (27, 29, 31, and 32°C), without stirring. The slurry was dried at room temperature and characterized. Fourier transform infrared spectroscopy showed the formation of βL for the samples prepared at 29 and 32°C. Raman spectroscopy confirmed this result and suggested the occurrence of crystalline βL. Rietveld refinement of the X-ray diffraction patterns was employed to identify and quantify the composition of the isomers. The samples prepared at 29 and 31°C showed the formation of pure βL, while those at 27 and 32°C showed the presence of αL·H2O and a mixture of the two isomers, respectively. The morphology of the powders was studied by scanning electron microscopy, observing the formation of irregular shape αL·H2O particles and axe-like βL particles. Clearly, with this methodology, it was possible to obtain pure, crystalline, and anhydrous βL at mild temperature.

Preparation and Characterization of Well-Dispersed Nd1.6Eu0.4Zr2O7 Solid Solution and its Fluorescent Behavior

2010 ◽  
Vol 97-101 ◽  
pp. 182-186
Author(s):  
Yu Ping Tong ◽  
Jing Wang ◽  
Rui Zhu Zhang ◽  
Shun Bo Zhao
Keyword(s):  
Solid Solution ◽  
Solid Solutions ◽  
Room Temperature ◽  
Single Phase ◽  
Combustion Process ◽  
Crystal Form ◽  
Scherrer Formula ◽  
Xrd Patterns ◽  
Average Size

Well-dispersed Nd1.6Eu0.4Zr2O7 solid solutions were successfully prepared by a convenient salt-assisted combustion process using glycine as fuel. The samples were characterized by XRD, Raman, TEM and HRTEM. The results showed that the Nd ion can be partially replaced by Eu ion. The substituted product was still single-phase solid solutions and the crystal form remained unchanged. TEM images showed that the Nd1.6Eu0.4Zr2O7 solid solutions were composed of well-dispersed sphere-shaped nanocrystals with an average size of 30 nm, which is consistent with the value obtained from XRD patterns using the Scherrer formula. Moreover, the fluorescent characterization of the Nd1.6Eu0.4Zr2O7 nanocrystals at 385 nm upon excitation was carried out at room temperature, and the results showed that there were some intense and prevailing emission peaks located at 590-650 nm.

Synthesis and Characterization of Y2Ti2O7 Photocatalytic Powders by Thermal Assist Process

2017 ◽  
Vol 380 ◽  
pp. 86-91 ◽  
Author(s):  
Won Joon Lee ◽  
Dong Sik Bae
Keyword(s):  
Calcination Temperature ◽  
Size Range ◽  
Coating Layer ◽  
Dip Coating ◽  
Solution Ph ◽  
Glass Substrates ◽  
Synthesis Parameters ◽  
Co Precipitation ◽  
Average Size

Y2Ti2O7nanoparticles have been synthesized by co-precipitation. Y2Ti2O7was coated on a glass substrate. The average size of the synthesized Y2Ti2O7particles and thickness of the coating layer can be controlled by manipulating the relative conditions. The average size of synthesized Y2Ti2O7nanoparticles was about in the size range of 20 to 30nm with calcination temperature. The effects of synthesis parameters, such as solution pH and calcination temperature, are discussed. The synthesized Y2Ti2O7nanoparticles were coated on glass substrates by a dip coating process.

scholarly journals Synthesis and characterization of isoniazid immobilized polylactide-co-glycolide nanoparticles

2021 ◽  
Vol 101 (1) ◽  
pp. 61-70
Author(s):  
Ye.M. Tazhbayev ◽  
◽  
A.R. Galiyeva ◽  
T.S. Zhumagaliyeva ◽  
M.Zh. Burkeyev ◽  
...  
Keyword(s):  
Physicochemical Parameters ◽  
Surfactant Concentration ◽  
Synthesis And Characterization ◽  
Optimal Conditions ◽  
Drug Form ◽  
Synthesis Parameters ◽  
Antituberculous Drug ◽  
Average Size ◽  
Instrumental Methods

This article considers someaspects of synthesis and characterizationof polylactide-co-glycolide nanoparticles immobilized withthe antituberculous drug isoniazid. The influence of some synthesis parameters of nanoparticles (the ratio of drug substance:polymer and surfactant concentration) onproperties of the obtained nanosomal drug form of isoniazid has been studied. Optimal conditions for obtainingthenanoparticles with the best physicochemical parameters such as: particle size, polydispersity, conversion, etc. have been found. These nanoparticlescan be used asdrug carriers.The results revealed thata polymer: drug ratio of 1:1 and the use of 3% Twin 80 are necessaryto obtain stable emulsions of nanoparticles of polylactide-co-glycolide with satisfactory characteristics. Average size of the obtained particles was 196.4 nm,and the polydispersity value was 0.323. The aggregation stability of nanoparticles during 4 hours at temperatures of 4ºC and 20ºC has been evaluated. The morphology of the obtained nanoparticles has been studied.Analysis of nanoparticles was characterized by various instrumental methods includinggas chromatography and thermogravimetrytechniques. The resulting nanoparticles of polylactide-co-glycolide immobilized with isoniazid are stable in time andcanprolong the action of the drug. In vitrorelease of isoniazid from polylactide-co-glycolide nanoparticles hasbeen studied.

Synthesis and Characterization of Superparamagnetic Fe3O4 Nanoparticles

2013 ◽  
Vol 750-752 ◽  
pp. 340-343 ◽  
Author(s):  
De Hui Sun ◽  
Jiao Wu ◽  
Ji Lin Zhang
Keyword(s):  
Room Temperature ◽  
Thermal Method ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Xrd Pattern ◽  
X Ray ◽  
Magnetic Investigation ◽  
Average Size

We synthesized Fe3O4 nanoparticles using a solvent thermal method and characterized the morphologies, structures, surface properties, thermal stability and magnetism of the products by Field emission scanning electron microscopy (FE-SEM), Powder X-ray diffraction (XRD), Fourier transform infrared (FTIR), thermal gravimetric analysis (TGA) and vibrating sample magnetometer (VSM). The experimental results showed that the Fe3O4 nanoparticles have a tunable average size range from 55 nm to 85 nm. Their diameters decreased with increase of precursor FeCl24H2O concentration or increase of the reaction time under other reaction conditions held constant. The XRD pattern confirmed that the Fe3O4 nanoparticles belong to cubic structure. Magnetic investigation reveals that the Fe3O4 nanoparticles have higher saturation magnetization and negligible coercivity at room temperature.

Synthesis and Characterization of Gd2O3 Doped CeO2 Nanopowders by a Glycothermal Process

2010 ◽  
Vol 297-301 ◽  
pp. 1140-1145
Author(s):  
Hyun Ju Kim ◽  
Hoy Yul Park ◽  
Min Cheol Chu ◽  
Dong Sik Bae
Keyword(s):  
Spherical Shape ◽  
Ammonium Hydroxide ◽  
Solvent Ratio ◽  
Solution Ph ◽  
Starting Solution ◽  
Xrd Diffraction ◽  
Metal Nitrates ◽  
Doped Ceo2 ◽  
Average Size ◽  
Glycol Solution

Gd2O3 doped CeO2 nanopowders were prepared under high temperature and pressure conditions by precipitation from metal nitrates with aqueous ammonium hydroxide. Spherical shape Gd2O3 doped CeO2 nanopowders were obtained By a reaction at the temperature range of 200°C – 230°C for 6 h. The average size and size distribution of the synthesized particles were below 10 nm and narrow, respectively. The XRD diffraction pattern shows that the synthesized powders were crystalline. This study has shown that the synthesis of Gd2O3 doped CeO2 nanopowders is possible under glycothermal conditions in ethylene glycol solution. The effects of synthesis parameters, such as the solvent ratio of starting solution, pH of starting solution, reaction temperature and time, are discussed.

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