Physico-Chemical Characterization of the Coprecipitated Y-Ba-Cu-O Fine Powders

1988 ◽  
Vol 121 ◽  
Author(s):  
H. M. Jang ◽  
K. W. Moon ◽  
J. H. Moon ◽  
H. S. Shin ◽  
S. J. Kwon ◽  
...  
Keyword(s):  
Chemical Characterization ◽  
Copper Nitrate ◽  
Systematic Change ◽  
Yttrium Nitrate ◽  
Gravimetric Analysis ◽  
Uniform Size ◽  
Fine Powders ◽  
Metal Nitrates ◽  
Physico Chemical ◽  
Fixed Concentration

ABSTRACTY-Ba-Cu-o fine powders were prepared by coprecipitating in the oxalate form from metal nitrates solution. The stoichiometry of metals in the precipitate was adjusted by systematic change of copper nitrate (or yttrium nitrate) concentration for a fixed concentration of barium nitrate in the ruactant. Approximately one micron size powders, with a uniform size distribution, were obtained by this new approach. The optimum condition for calcination and sintering was studied by thermal gravimetric analysis(TGA), X-ray powder diffraction(XRD) and scanning electron microscopy(SEM).

Surface decontamination in fuel manufacture plants by chelating solution of nanoparticles

2017 ◽  
Vol 0 (0) ◽  
Author(s):  
T. M. Morsi ◽  
Ahmed M. Elbarbary ◽  
Mohamed M. Ghobashy ◽  
Sameh H. Othman
Keyword(s):  
Cyano Group ◽  
Chemical Properties ◽  
Germanium Detector ◽  
Gravimetric Analysis ◽  
Uniform Size ◽  
Transmission Electron ◽  
Physico Chemical ◽  
Radiation Induced ◽  
Surface Decontamination ◽  
Thermal Stability Of

AbstractA nanoparticles chelating solution was synthesized by copolymerization of acrylonitrile (AN) and methacrylic acid (MAA) by radiation induced polymerization technique using 17 kGy irradiation doses. A high copolymer yield was obtained by using 80/20% of AN/MAA and comonomer concentration of 50% (w/w) at a dose rate of 2.58 KGy/h. The resultant cyano group (–CN) of nano-poly(AN/MAA) was converted by chemical modification using hydroxylamine (NH2–OH) to an amidoxime group [–C(=NOH)NH2], which was then confirmed by Fourier transform infrared spectroscopy (FTIR). The physico-chemical properties of poly(AN/MAA) and amidoximated poly(AN/MAA) nanoparticles were studied by FTIR, transmission electron microscopy (TEM), dynamic light scattering (DLS) and thermal gravimetric analysis (TGA). The morphological analysis by TEM and DLS showed a spherical and uniform size of the amidoximated poly(AN/MAA) nanoparticles. TGA results indicated that the thermal stability of poly(AN/MAA) increased by the amidoximation process. The surface decontamination due to uranium was also investigated by the prepared chelating nanoparticles solution. A high purity germanium detector (HPGe) was used as a surface contamination detection tool. The results showed the presence of peaks at different energies, namely, 186.2 keV for Ra-226 (U-238) and 143.76 keV, 163.35 keV and 205.31 for U-235 before the decontamination process. The disappearance of these peaks after decontamination confirmed the applicability and efficiency of the nanoparticles solution in uranium surface decontamination.

Laboratory Methods for the Physico-Chemical Characterization of Recombinant Allergens as Reference Standards

Alergologia ◽  
2020 ◽  
Vol 1 (4) ◽  
pp. 7
Author(s):  
Mariana Vieru ◽  
Florin-Dan Popescu ◽  
Laura Haidar ◽  
Carmen Bunu-Panaitescu
Keyword(s):  
Chemical Characterization ◽  
Reference Standards ◽  
Recombinant Allergens ◽  
Laboratory Methods ◽  
Physico Chemical

Mineralogical and physico-chemical characterization of a sintered feldspathic sand

2010 ◽  
Vol 35 (5) ◽  
pp. 261-267 ◽  
Author(s):  
Wissemn Gallala ◽  
Mohamed Essghaier Gaied ◽  
Borhen Kchaou
Keyword(s):  
Chemical Characterization ◽  
Physico Chemical

Physical - Chemical Issues of Cephalosporin Intercalated Nanoparticles for Life - Threatening Infections Treatment

2001 ◽  
Vol 71 (3) ◽  
pp. 342-349
Author(s):  
Lucian Eva ◽  
Letitia Doina Duceac ◽  
Liviu Stafie ◽  
Constantin Marcu ◽  
Geta Mitrea ◽  
...  
Keyword(s):  
Chemical Characterization ◽  
Advanced Characterization ◽  
Generation Cephalosporin ◽  
Fourth Generation ◽  
Exchange Method ◽  
Physico Chemical ◽  
Life Threatening ◽  
Double Hydroxide ◽  
Double Hydroxides

The fourth generation cephalosporin antibacterial agent, cefepime, was loaded into layered double hydroxides for enhancing antibiotic efficiency, reducing side effects, as well as achieving the sustained release property. The intercalation of antibiotic into the inter-gallery of ZnAl-layered double hydroxide (LDH) was carried out using ion exchange method, by this constituting a nano-sized organic-inorganic hybrid material for a controlled release novel formulation. Although cefepime is a broad spectrum antibiotic, it has various adverse effects and a significant degradation rate. Thus, the preparation and physico-chemical characterization of nanomaterials able to intercalate this drug is an important study for medical and pharmaceutical field. The antibiotic inclusion into LDHs nanostructure was confirmed by advanced characterization techniques and the release profile of cefepime was analysed with the respect to pH of the simulated media.

Physico-chemical characterization and aging effects of fructan exopolysaccharide produced by Weissella cibaria MD2 on Caenorhabditis elegans

LWT ◽  
2021 ◽  
Vol 143 ◽  
pp. 111100
Author(s):  
Avinash Kant Lakra ◽  
Mahesh Ramatchandirane ◽  
Sandeep Kumar ◽  
Kitlangki Suchiang ◽  
Venkatesan Arul
Keyword(s):  
Caenorhabditis Elegans ◽  
Chemical Characterization ◽  
Aging Effects ◽  
Weissella Cibaria ◽  
Physico Chemical
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