scholarly journals Thermal stability, electrochemical and structural characterization of hydrothermally synthesised cobalt ferrite (CoFe2O4)

RSC Advances ◽  
2019 ◽  
Vol 9 (57) ◽  
pp. 33282-33289 ◽  
Author(s):  
Michele Bastianello ◽  
Silvia Gross ◽  
Matthias T. Elm
Keyword(s):  
Thermal Stability ◽  
Low Temperature ◽  
Structural Characterization ◽  
High Purity ◽  
Cobalt Ferrite ◽  
Hazardous Chemicals ◽  
Hydrothermal Route ◽  
Nano Crystalline

Monophasic nano-crystalline CoFe2O4 (CFO) nanoparticles of high purity have been synthesised through a low temperature hydrothermal route, which does not involve hazardous chemicals, or conditions.

Synthesis and Structural Characterization of NaxSi136 (0 < x ≤ 24) Single Crystals and Low-Temperature Transport of Polycrystalline Specimens

2012 ◽  
Vol 51 (16) ◽  
pp. 8686-8692 ◽  
Author(s):  
Stevce Stefanoski ◽  
Christos D. Malliakas ◽  
Mercouri G. Kanatzidis ◽  
George S. Nolas
Keyword(s):  
Low Temperature ◽  
Single Crystals ◽  
Structural Characterization ◽  
X 24

Photoluminescence of ZnO:Eu3+ Nanoflowers

2008 ◽  
Vol 8 (3) ◽  
pp. 1307-1311 ◽  
Author(s):  
Peter A. Tanner ◽  
Lixin Yu
Keyword(s):  
Low Temperature ◽  
Conduction Band ◽  
Selective Excitation ◽  
Ftir Spectra ◽  
Photoluminescence Spectra ◽  
Defect States ◽  
Hydrothermal Route ◽  
Broadband Emission ◽  
The Eu

The synthesis of ZnO:Eu3+ nanoflowers by a low-temperature hydrothermal route is described. Characterization of the materials was performed by ESEM, XRD and FTIR spectra. The 355 nm excited photoluminescence spectra at 10 K do not indicate the presence of Eu2+ or the ZnO defect states which give rise to green or red broadband emission. Excitation into the ZnO conduction band at low temperature does not give emission from Eu3+. Selective excitation of the Eu3+ emission shows that Eu3+ ions occupy a variety of different sites, of which one of them is similar to Eu3+ in C-type Eu2O3.

scholarly journals Biochemical and Structural Characterization of the Subclass B1 Metallo-β-Lactamase VIM-4

2010 ◽  
Vol 55 (3) ◽  
pp. 1248-1255 ◽  
Author(s):  
Patricia Lassaux ◽  
Daouda A. K. Traoré ◽  
Elodie Loisel ◽  
Adrien Favier ◽  
Jean-Denis Docquier ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Escherichia Coli ◽  
Thermal Stability ◽  
Pseudomonas Aeruginosa ◽  
Structural Characterization ◽  
Catalytic Efficiency ◽  
X Ray ◽  
Stabilizing Effect ◽  
Loop 2

ABSTRACTThe metallo-β-lactamase VIM-4, mainly found inPseudomonas aeruginosaorAcinetobacter baumannii, was produced inEscherichia coliand characterized by biochemical and X-ray techniques. A detailed kinetic study performed in the presence of Zn2+at concentrations ranging from 0.4 to 100 μM showed that VIM-4 exhibits a kinetic profile similar to the profiles of VIM-2 and VIM-1. However, VIM-4 is more active than VIM-1 against benzylpenicillin, cephalothin, nitrocefin, and imipenem and is less active than VIM-2 against ampicillin and meropenem. The crystal structure of the dizinc form of VIM-4 was solved at 1.9 Å. The sole difference between VIM-4 and VIM-1 is found at residue 228, which is Ser in VIM-1 and Arg in VIM-4. This substitution has a major impact on the VIM-4 catalytic efficiency compared to that of VIM-1. In contrast, the differences between VIM-2 and VIM-4 seem to be due to a different position of the flapping loop and two substitutions in loop 2. Study of the thermal stability and the activity of the holo- and apo-VIM-4 enzymes revealed that Zn2+ions have a pronounced stabilizing effect on the enzyme and are necessary for preserving the structure.

scholarly journals Low temperature synthesis route and structural characterization of (Bi0.5A0.5)(Sc0.5Nb0.5)O3 (A = K+ and Na+) perovskites

2018 ◽  
Vol 5 (5) ◽  
pp. 1033-1044 ◽  
Author(s):  
T. Wesley Surta ◽  
Alicia Manjón-Sanz ◽  
Eric Qian ◽  
T. Thao Tran ◽  
Michelle R. Dolgos
Keyword(s):  
Crystal Structure ◽  
Low Temperature ◽  
Structural Characterization ◽  
Structure Determination ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Synthesis And Crystal Structure ◽  
Synthesis Route ◽  
Phase Pure

First report of the phase pure synthesis and crystal structure determination for Bi0.5A0.5(Sc0.5Ta0.5)O3 (A = K+, Na+).

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