scholarly journals Advantages of Electrochemical Polishing of Metals and Alloys in Ionic Liquids

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 959
Author(s):  
Olga Lebedeva ◽  
Dmitry Kultin ◽  
Alexandre Zakharov ◽  
Leonid Kustov
Keyword(s):  
Stainless Steel ◽  
Ionic Liquids ◽  
Aqueous Solutions ◽  
Metal Surfaces ◽  
Mechanical Treatment ◽  
Electrochemical Stability ◽  
Metals And Alloys ◽  
Electrochemical Polishing ◽  
Special Equipment ◽  
Medical Instruments

Electropolishing of metal surfaces is a benign alternative to mechanical treatment. Ionic liquids are considered as green electrolytes for the electropolishing of metals. They demonstrate a number of advantages in comparison with acid aqueous solutions and other methods of producing smooth or mirror-like surfaces that are required by diverse applications (medical instruments, special equipment, implants and prostheses, etc.). A wide window of electrochemical stability, recyclability, stability and tunability are just a few benefits provided by ionic liquids in the title application. An overview of the literature data on electropolishing of such metals as Ti, Ni, Pt, Cu, Al, U, Sn, Ag, Nb, stainless steel and other alloys in ionic liquids is presented.

Adsorption of Aqueous Nonylphenol Ethoxylate Surfactants on Metal Sample Loops: Effect on Quantitation by Liquid Chromatography

1990 ◽  
Vol 73 (2) ◽  
pp. 322-324
Author(s):  
B B Sithole ◽  
B Zvilichovsky ◽  
C Lapointe ◽  
L H Allen
Keyword(s):  
Stainless Steel ◽  
Liquid Chromatography ◽  
Aqueous Solutions ◽  
Metal Surfaces ◽  
Peak Height ◽  
Surfactant Adsorption ◽  
Good Precision ◽  
Metal Sample ◽  
Nonylphenol Ethoxylate ◽  
Calibration Curves

Abstract In aqueous solutions of Igepal CO 610, a nonionic nonylphenol ethoxylate surfactant, adsorption of the surfactant takes place onto stainless steel metal surfaces. This adsorption results in increased peak height of the surfactant when a sample loop is purged with increasing volumes of the surfactant. This, in turn, affects the quantitation of the surfactant. However, the adsorption is reproducible at constant purging volumes and results in calibration curves with good precision.

scholarly journals Plasma Polishing of Stainless Steels – The Electrolyte Concentration Vs. Gloss Level

2018 ◽  
Vol 26 (42) ◽  
pp. 171-176 ◽  
Author(s):  
Štefan Podhorský ◽  
Martin Bajčičák
Keyword(s):  
Stainless Steel ◽  
Aqueous Solutions ◽  
Ammonium Sulphate ◽  
Stainless Steels ◽  
Electrolyte Concentration ◽  
Inorganic Salts ◽  
Electrochemical Polishing ◽  
Polishing Process ◽  
Environmental Friendly ◽  
The Common

Abstract The technology of plasma polishing in electrolyte is considered as environmental friendly alternative to the common electrochemical polishing process. The solutions of the electrolyte use no acids or toxicants, but the environmental safe, low concentrated aqueous solutions of various inorganic salts are used instead. The dependence of the gloss level of the treated surface upon the electrolyte concentration as well as upon the voltage is examined in this paper. The specimens of stainless steel were used for plasma polishing in ammonium sulphate based electrolyte. The influence of the voltage on the overall properties of the process is discussed, as well.

scholarly journals Enhancing Artemisinin Solubility in Aqueous Solutions: Searching for Hydrotropes based on Ionic Liquids

2021 ◽  
Vol 534 ◽  
pp. 112961
Author(s):  
Isabela Sales ◽  
Dinis O. Abranches ◽  
Pedro Costa ◽  
Tânia E. Sintra ◽  
Sónia P.M. Ventura ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Aqueous Solutions

scholarly journals Comparison of the Performances of Different Computational Methods to Calculate the Electrochemical Stability of Selected Ionic Liquids

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3221
Author(s):  
Annalisa Paolone ◽  
Sergio Brutti
Keyword(s):  
Ionic Liquids ◽  
Density Functional ◽  
Quantitative Agreement ◽  
Electrochemical Stability ◽  
Functional Theory ◽  
Molecular Systems ◽  
Reduction Potentials ◽  
Adiabatic Transitions ◽  
Alkyl Ammonium ◽  
Transition Scheme

The electrochemical stability windows (ESW) of selected ionic liquids have been calculated by comparing different computational approaches previously suggested in the literature. The molecular systems under study are based on di-alkyl imidazolium and tetra-alkyl ammonium cations coupled with two different imide anions (namely, bis-fluorosulfonyl imide and bis-trifluoromethyl sulfonyl imide), for which an experimental investigation of the ESW is available. Thermodynamic oxidation and reduction potentials have here been estimated by different models based on calculations either on single ions or on ionic couples. Various Density Functional Theory (DFT) functionals (MP2, B3LYP, B3LYP including a polarizable medium and empirical dispersion forces) were exploited. Both vertical and adiabatic transitions between the starting states and the oxidized or reduced states were considered. The approach based on calculations on ionic couples is not able to reproduce the experimental data, whatever the used DFT functional. The best quantitative agreement is obtained by calculations on single ions when the MP2 functional in vacuum is considered and the transitions between differently charged states are vertical (purely electronic without the relaxation of the structure). The B3LYP functional underestimates the ESW. The inclusion of a polar medium excessively widens the ESW, while a large shrinkage of the ESW is obtained by adopting an adiabatic transition scheme instead of a vertical transition one.

Adsorption of imidazolium-based ionic liquids with different chemical structures onto various resins from aqueous solutions

RSC Advances ◽  
2015 ◽  
Vol 5 (52) ◽  
pp. 41352-41358 ◽  
Author(s):  
Luyang Li ◽  
Yu Wang ◽  
Xinhua Qi
Keyword(s):  
Ionic Liquids ◽  
Aqueous Solutions ◽  
Adsorption Behavior ◽  
Chemical Structures

The adsorption behavior of a series of imidazolium-based ionic liquids with different chemical structures onto various resins was investigated.

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