A cell for the study of the electrolytic conductivity at high temperature in aqueous solutions

1993 ◽  
Vol 64 (6) ◽  
pp. 1636-1640 ◽  
Author(s):  
H. Bianchi ◽  
H. R. Corti ◽  
R. Fernández‐Prini
Keyword(s):  
High Temperature ◽  
Aqueous Solutions ◽  
Electrolytic Conductivity ◽  
A Cell

The Study of the Kinetics of the Passivation of Nickel in High Temperature Aqueous Solutions

1995 ◽  
Vol 185-188 ◽  
pp. 655-666
Author(s):  
T. Agladze ◽  
G. Tsurtsumia ◽  
I. Khorbaladze ◽  
T. Ekhvaia
Keyword(s):  
High Temperature ◽  
Aqueous Solutions ◽  
Kinetics Of

Electrolytic synthesis of ZrSi/ZrC nanocomposites from ZrSiO4 and carbon black powder in molten salt

2020 ◽  
Vol 111 (7) ◽  
pp. 581-586
Author(s):  
Li Ming ◽  
Wu Xiufeng
Keyword(s):  
Electron Microscopy ◽  
High Temperature ◽  
Carbon Black ◽  
Molten Salt ◽  
Cell Voltage ◽  
Black Powder ◽  
X Ray ◽  
Carbon Black Powder ◽  
Transmission Electron ◽  
A Cell

Abstract ZrSi/ZrC nanocomposites have stable high-temperature properties, where conventional materials cannot meet increasingly demanding high-temperature environments. In this paper, the microstructure and electrochemical reduction mechanism of ZrSi/ZrC nanocomposites have been studied. A mixture of ZrSiO4 and carbon black powder was processed using ball grinding, sheet pressing, and sintering, and cylindrically-sintered sheet was prepared as the cathode for the electrolytic work. A high purity graphite rod was utilized as the anode.The microstructure of the electrolytic product was characterized and analyzed using X-ray diffraction, scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy, and transmission electron microscopy. The experimental results showed that the diameter of the as-synthesized ZrSi/ ZrC fibers typically range between 100-400 nm when produced by the electrolysis of sintered pellets in equimolar CaCl2-NaCl molten salt at 850°C with a cell voltage of 2.8 V for 20 h under an argon atmosphere. The nanofibers were formed in core-shell microstructures that overlap and grow.

Structural and electronic evolution of the As(OH)3 molecule in high temperature aqueous solutions: An x-ray absorption investigation

2004 ◽  
Vol 121 (18) ◽  
pp. 8973-8982 ◽  
Author(s):  
Denis Testemale ◽  
Jean-Louis Hazemann ◽  
Gleb S. Pokrovski ◽  
Yves Joly ◽  
Jacques Roux ◽  
...  
Keyword(s):  
High Temperature ◽  
Aqueous Solutions ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Solubility and Bioactivity of the Pseudomonas Quinolone Signal Are Increased by a Pseudomonas aeruginosa-Produced Surfactant

2005 ◽  
Vol 73 (2) ◽  
pp. 878-882 ◽  
Author(s):  
M. Worth Calfee ◽  
John G. Shelton ◽  
James A. McCubrey ◽  
Everett C. Pesci
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Aqueous Solutions ◽  
Opportunistic Pathogen ◽  
Homoserine Lactone ◽  
Cellular Functions ◽  
Pseudomonas Quinolone Signal ◽  
Serious Infections ◽  
Enhanced Solubility ◽  
Apoptosis Assay ◽  
A Cell

ABSTRACT Pseudomonas aeruginosa is a gram-negative bacterium that causes serious infections in immunocompromised individuals and cystic fibrosis patients. This opportunistic pathogen controls many of its virulence factors and cellular functions through the activity of three cell-to-cell signals, N-(3-oxododecanoyl)-l-homoserine lactone, N-butyryl-l-homoserine lactone, and the Pseudomonas quinolone signal (PQS). The activity of these signals is dependent upon their ability to dissolve in and freely diffuse through the aqueous solution in which P. aeruginosa happens to reside. Despite this, our data indicated that PQS was relatively insoluble in aqueous solutions, which led us to postulate that P. aeruginosa could be producing a PQS-solubilizing factor. In this report, we show that the P. aeruginosa-produced biosurfactant rhamnolipid greatly enhances the solubility of PQS in aqueous solutions. The enhanced solubility of PQS led to an increase in PQS bioactivity, as measured by both a gene induction assay and an apoptosis assay. This is the first demonstration of the importance of a bacterial surfactant in the solubilization and bioactivity of a cell-to-cell signal.

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