Spectrothermal investigation of the decomposition course of lanthanum acetate hydrate

1994 ◽  
Vol 42 (6) ◽  
pp. 1091-1102 ◽  
Author(s):  
G. A. M. Hussein
Keyword(s):  
Acetate Hydrate ◽  
Lanthanum Acetate

Kinetics of nonisothermal dehydration of unirradiated and γ-ray irradiated neodymium (III) acetate hydrate

2019 ◽  
Vol 107 (2) ◽  
pp. 165-178
Author(s):  
Noura Mossaed Saleh ◽  
Ghada Adel Mahmoud ◽  
AbdelRahman AbdelMonem Dahy ◽  
Soliman Abdel-Fadeel Soliman ◽  
Refaat Mohamed Mahfouz
Keyword(s):  
Absorbed Dose ◽  
Isoconversional Methods ◽  
Gas Diffusion ◽  
Conversion Degree ◽  
Monoclinic System ◽  
Air Atmosphere ◽  
Dehydration Reactions ◽  
Γ Ray ◽  
Acetate Hydrate ◽  
Kinetics Of

Abstract Kinetics of dehydration of unirradiated and γ-ray irradiated neodymium (III) acetate hydrate with 103 kGy total γ-ray dose absorbed in air atmosphere were studied by isoconversional nonisothermal method. The dehydration proceeds in two steps with the elimination of 0.8 and 0.4 mol of H2O, respectively. This result indicates that the investigated neodymium (III) acetate hydrate contains 1.2 mol of crystalline water in its structure. The dehydration reactions are best described by nucleation (A2 model) and gas diffusion (D4 model) for unirradiated and γ-ray irradiated samples, respectively. Analysis of the kinetic data using linear and nonlinear isoconversional methods showed that the apparent activation energy, Ea (kJ/mol) is dependent on the conversion degree, α, of the dehydration process. The Ea−α plots for both unirradiated and γ-ray irradiated neodymium (III) acetate hydrate showed that the dehydration is a complex process and contains multistep reactions. The results showed that γ-ray irradiation has a significant effect on the kinetics and thermodynamic parameters of the dehydration reaction. Powder X-ray diffraction showed that neodymium (III) acetate hydrate has a monoclinic system (SG P2/m) and no phase transformation was detected by γ-ray irradiation up to 103 kGy absorbed dose. The system maintains the same crystal structure before and after dehydration.

Evaluation of treatment with zinc acetate hydrate in patients with liver cirrhosis complicated by zinc deficiency

2020 ◽  
Vol 50 (4) ◽  
pp. 488-501
Author(s):  
Itaru Ozeki ◽  
Tomoaki Nakajima ◽  
Hirokazu Suii ◽  
Ryoji Tatsumi ◽  
Masakatsu Yamaguchi ◽  
...  
Keyword(s):  
Liver Cirrhosis ◽  
Zinc Deficiency ◽  
Zinc Acetate ◽  
Acetate Hydrate

scholarly journals Morphological and Optical Properties of Cobalt Ion-Modified ZnO Nanowires

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 614
Author(s):  
Seok Cheol Choi ◽  
Do Kyung Lee ◽  
Sang Ho Sohn
Keyword(s):  
Optical Properties ◽  
Hydrothermal Synthesis ◽  
Oxygen Vacancies ◽  
Morphological Changes ◽  
Zno Nanowires ◽  
Oxide Cluster ◽  
Co Doping ◽  
Co Concentration ◽  
Acetate Hydrate ◽  
Low Levels

In this study, we prepared cobalt (Co) ion-modified ZnO nanowires using hydrothermal synthesis with zinc acetate dehydrate and Co (II) acetate hydrate precursors in ethanol solutions. Their morphological and optical properties were investigated with varying Co precursor concentration. The morphological changes of the ZnO nanowires depended positively on the concentration of the Co precursor. The ZnO nanowires showed modified crystal orientations and nanostructure shapes depending on the Co concentration in the solutions. Variations in the optical properties of the Co ion-modified ZnO nanowires could be explained by the interaction of the Co ions with the band electrons, oxygen vacancies, and zinc interstitials. The overall growth and characteristics of ZnO nanowires synthesized in solutions containing low levels of Co ions were related to Co doping into the ZnO bulks. In solutions containing high levels of Co ions, these were additionally related to the Co oxide cluster.

Electrochemical performance of M3(BTC)2·12H2O (M=Co, Ni, and Zn) for Supercapacitors

2011 ◽  
Vol 15 (2) ◽  
pp. 79-82
Author(s):  
Chenmin Liao ◽  
Jiachang Zhao ◽  
Bohejin Tang ◽  
Aomin Tang ◽  
Yanhong Sun ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Impedance ◽  
Metal Organic Frameworks ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scan Rate ◽  
Metal Organic ◽  
Acetate Hydrate ◽  
Xrd Patterns ◽  
Maximum Specific Capacitance

A series of Metal-Organic Frameworks (MOFs) based on 1,3,5-benzenetricarboxylic (BTC) acid and M(II) acetate hydrate (M=Co, Ni, and Zn) were successfully synthesized and named as M3(BTC)2·12H2O. These compounds were examined by X-ray diffraction (XRD) patterns. Electrochemical properties of the materials were characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in 6 M KOH aqueous solutions. The maximum specific capacitance of Ni3(BTC)2·12H2O is found to be 429 F g-1 at 5 mV s-1 and 154 F g-1 at 200 mV s-1 scan rate.

scholarly journals THE PRODUCTION OF A PERSISTENT ALTERATION IN INFLUENZA VIRUS BY LANTHANUM OR ULTRAVIOLET IRRADIATION

1948 ◽  
Vol 88 (4) ◽  
pp. 445-461 ◽  
Author(s):  
Sven E. Björkman ◽  
Frank L. Horsfall
Keyword(s):  
Influenza Virus ◽  
Serial Passage ◽  
Heterogeneous Population ◽  
Chick Embryos ◽  
Single Treatment ◽  
Virus Particles ◽  
Elution Rate ◽  
The Difference ◽  
Subsequent Passage ◽  
Lanthanum Acetate

The rates of elution from RBC of the Lee and PR8 strains of influenza virus were studied by means of a step-wise elution technique. By means of a single treatment with lanthanum acetate or irradiation with ultraviolet and subsequent passage in chick embryos, it was possible to alter the elution rate of the Lee strain so that it was similar to that of the PR8 strain. This alteration proved to be persistent on serial passage in the absence of the agent which caused it. As far as was determined, the elution rate of the virus appeared to be the only property which was altered. The phenomenon can be most readily understood on the assumption that the difference in elution rates of the two strains is due to a heterogeneous population of virus particles in the Lee strain with respect to elution rate.

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