scholarly journals Fe–Mn Alloys Electroforming Process Using Choline Chloride Based Deep Eutectic Solvents

2021 ◽  
Vol 5 (1) ◽  
pp. 40
Author(s):  
Vinicius Sales ◽  
Carlo Paternoster ◽  
Diego Mantovani ◽  
Georgios Kolliopoulos
Keyword(s):  
Cyclic Voltammetry ◽  
Ionic Liquids ◽  
Ethylene Glycol ◽  
Reduction Potential ◽  
Choline Chloride ◽  
Deep Eutectic Solvents ◽  
Electrochemical Potential ◽  
Bath Composition ◽  
Promising Alternative ◽  
Electrodeposition Of Metals

Aqueous solvents, despite being effective in the electrodeposition of metals with positive reduction potential, fail to deposit metals with negative reduction potential due to their narrow electrochemical potential window. Deep eutectic solvents (DESs), a class of ionic liquids, are a promising alternative of inexpensive, biodegradable, non-toxic anhydrous solvents that present wide electrochemical potential windows. The present work reports on the potential of choline chloride/ethylene glycol DES in the electrodeposition of Fe–Mn alloys. Cyclic voltammetry tests showed that increasing the quantity of Mn in the bath composition decreases the deposition current of the alloy.

The Use of Deep Eutectic Solvents Ionic Liquids for Selective Dissolution and Recovery of Sn, Pb and Zn from Electric and Electronic Waste (WEEE)

2017 ◽  
Vol 68 (9) ◽  
pp. 1963-1968
Author(s):  
Ana Maria Popescu ◽  
Cristina Donath ◽  
Elena Ionela Neacsu ◽  
Vasile Soare ◽  
Ionut Constantin ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Anodic Dissolution ◽  
Electronic Waste ◽  
Choline Chloride ◽  
Deep Eutectic Solvents ◽  
Selective Dissolution ◽  
Cathodic Deposition ◽  
Structure And Morphology

The recovery of metals from a multi-component alloy obtained by crushing, melting and anodic dissolution of waste electric and electronic equipment (WEEE) has been investigated. The aim of this paper is to selective recover of Sn, Pb and Zn by a novel ecological technology using ionic liquids. Metallic Sn, Pn and Zn were electrochemically recovered from the WEEE dissolved in choline chloride-ethylene glycol-iodine ionic liquid. Cyclic voltammetry was used in order to determine the deposition potentials of the studied metals. XRD and SEM/EDX analysis methods were used to characterize the structure and morphology of the metallic deposits. Evolution of the cathodic deposition and of the chemical composition of the anode during the anodic dissolution process for Sn, Pb and Zn was also studied. This study has demonstrated the possibility of selective recovery of Sn, Pb and Zn from the multi-component alloy (which resulted from consecutive anodic dissolution of WEEE) by anodic dissolution/deposition in ionic liquids.

Formation of Double-Cone-Shaped ZnO Mesocrystals by Addition of Ethylene Glycol to ZnO Dissolved Choline Chloride–Urea Deep Eutectic Solvents and Observation of Their Manners of Growth

CrystEngComm ◽  
2021 ◽  
Author(s):  
Hajime Wagata ◽  
Ginji Harada ◽  
Eriko Nakashima ◽  
Motoki Asaga ◽  
Tomoaki Watanabe ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Choline Chloride ◽  
Deep Eutectic Solvents ◽  
Double Cone ◽  
Crystal Shapes ◽  
Physical And Chemical

ZnO mesocrystals have been explored for various physical and chemical applications. In spite of effort by a number of researches, it is still difficult to grow specific crystal shapes in...

scholarly journals A Review of the electrochemical corrosion of metals in choline chloride based deep eutectic solvents

2021 ◽  
Author(s):  
Mihael Bučko ◽  
Jelena Bajat
Keyword(s):  
Ionic Liquids ◽  
Corrosion Rate ◽  
Wide Spectrum ◽  
Choline Chloride ◽  
Electrochemical Corrosion ◽  
Deep Eutectic Solvents ◽  
High Viscosity ◽  
Metal Corrosion ◽  
Melting Points ◽  
Separate Class

Deep eutectic solvents (DESs) are a class of mixtures with melting points notably lower than those of their raw constituent components. These liquids have found a tremendously wide spectrum of applications in the last two decades of their research, so their contact and interaction with technical metals and alloys are inevitable. Therefore, the corrosivity of DESs towards metals is an extremely important topic. This review summarizes research efforts collected in the last two decades related to the corrosion rate of various metals in different DESs. Since the DESs are mainly composed of organic raw compounds, and by their physicochemical properties they may be regarded as a separate class of ionic liquids, the literature data about DESs corrosivity has been compared to the data related to the corrosivity of various organic solvents and ionic liquids as well. All the results gained until now show significantly low corrosivity of DESs. This observation is discussed in relation to the chemical composition of DESs. The absence of the oxidizing agents, the inhibitory action of organic ions and molecules, high viscosity and low electrical conductivity have been recognized as the main factors contributing to the low metal corrosion rate in DESs.

scholarly journals Cross-dehydrogenative coupling reaction using copper oxide impregnated on magnetite in deep eutectic solvents

2016 ◽  
Vol 18 (3) ◽  
pp. 826-833 ◽  
Author(s):  
Xavier Marset ◽  
Juana M. Pérez ◽  
Diego J. Ramón
Keyword(s):  
Ethylene Glycol ◽  
Copper Oxide ◽  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
Coupling Reaction ◽  
Deep Eutectic Solvents ◽  
Dehydrogenative Coupling

The synthesis of different tetrahydroisoquinolines using choline chloride : ethylene glycol as a deep eutectic solvent (DES) and copper(ii) oxide impregnated on magnetite as a catalyst has been accomplished successfully.

scholarly journals Reduction of the Coefficient of Friction of Steel-Steel Tribological Contacts by Novel Graphene-Deep Eutectic Solvents (DESs) Lubricants

Lubricants ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 37 ◽  
Author(s):  
Ignacio Garcia ◽  
Silvia Guerra ◽  
Juan de Damborenea ◽  
Ana Conde
Keyword(s):  
Mechanical Properties ◽  
Ionic Liquids ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Adhesive Wear ◽  
Choline Chloride ◽  
Deep Eutectic Solvents ◽  
The Other ◽  
Graphene Flakes ◽  
The Coefficient Of Friction

Deep eutectic ionic liquids (DES) possess similar properties to conventional ionic liquids (ILs). However, ILs cannot be considered as environmentally friendly compounds due to both its processing and synthesis, which could have significant polluting effects. On the contrary, deep eutectic solvents (DESs) can be biodegradable, non-toxic, and have a lower price than most ILs, making them potentially useful in a wide variety of advanced technological applications, such as tribology. On the other hand, graphene has recently been proposed as an extremely promising lubricant due to its combination of mechanical properties and chemical stability as well as its “green” character. In the present paper, graphene flakes (≈250 nm) have been used as an additive to DES composed of choline chloride (ChCl)-urea, ChCl-ethylene glycol, and ChCl-malic acid. According to the results, the addition of 1 wt% graphene reduces friction coefficient (COF) and, notably, prevents adhesive wear, reducing wear rate on steel-steel sliding contacts.

scholarly journals Review on Carbon Dioxide Absorption by Choline Chloride/Urea Deep Eutectic Solvents

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Rima J. Isaifan ◽  
Abdukarem Amhamed
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Bond ◽  
Ionic Liquids ◽  
Choline Chloride ◽  
Deep Eutectic Solvents ◽  
Absorption Capacity ◽  
Carbon Dioxide Absorption ◽  
Hydrogen Bond Donor ◽  
Separation Processes ◽  
Hydrogen Bond Acceptor

In the recent past few years, deep eutectic solvents (DESs) were developed sharing similar characteristics to ionic liquids but with more advantageous features related to preparation cost, environmental impact, and efficiency for gas separation processes. Amongst many combinations of DES solvents that have been prepared, reline (choline chloride as the hydrogen bond acceptor mixed with urea as the hydrogen bond donor) was the first DES synthesized and is still the one with the lowest melting point. Choline chloride/urea DES has proven to be a promising solvent as an efficient medium for carbon dioxide capture when compared with amine alone or ionic liquids under the same conditions. This review sheds light on the preparation method, physical and chemical characteristics, and the CO2 absorption capacity of choline chloride/urea DES under different temperatures and pressures reported up to date.

Unassisted visible solar water splitting with efficient photoelectrodes sensitized by quantum dots synthesized via an environmentally friendly eutectic solvent-mediated approach

2018 ◽  
Vol 6 (45) ◽  
pp. 22566-22579 ◽  
Author(s):  
Uma V. Ghorpade ◽  
Mahesh P. Suryawanshi ◽  
Seung Wook Shin ◽  
Jihun Kim ◽  
Soon Hyung Kang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ethylene Glycol ◽  
Water Splitting ◽  
Choline Chloride ◽  
Environmentally Friendly ◽  
Deep Eutectic Solvents ◽  
Colloidal Quantum Dots ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Synthetic Media

Deep eutectic solvents (DESs) based on choline chloride/ethylene glycol have been explored as synthetic media for Cu–Sb–S based colloidal quantum dots for unassisted solar water splitting.

scholarly journals Adsorption phenomena at the interface between mercury and solutions containing choline chloride, ethylene glycol and water

2021 ◽  
pp. 50-58
Author(s):  
F.I. Danilov ◽  
◽  
Y.D. Rublova ◽  
V.S. Protsenko ◽  
◽  
...  
Keyword(s):  
Free Energy ◽  
Ethylene Glycol ◽  
Choline Chloride ◽  
Specific Interaction ◽  
Mercury Electrode ◽  
Deep Eutectic Solvent ◽  
Deep Eutectic Solvents ◽  
Charged Surface ◽  
Free Energies ◽  
Adsorption Phenomena

Adsorption of the components of deep eutectic solvent ethaline (ethylene glycol and choline chloride) on mercury electrode is investigated by electrocapillary measurements. It is determined that choline cations are mainly adsorbed on the negatively charged surface of mercury, while chloride anions are mainly adsorbed on the positively charged surface. The corresponding values of free energies of adsorption and interactions of adsorbate and solvent with metal are calculated and analyzed. An anomalous increase in both the apparent value of the adsorption at limiting coverage and the free energy of the interaction of the choline cation with mercury is observed in the transition from aqueous to ethylene glycol solutions, which is explained by the formation of complexes in a surface layer that exist in deep eutectic solvents and are capable of adsorbing on the electrode surface. The free energy of interaction with the mercury surface is higher than the energy of squeezing out from the volume of the solution onto its surface, which indicates the specific interaction of the adsorbate with mercury. A marked decrease in interfacial tension on both branches of the electrocapillary curve is observed when water is added to ethaline.

Electrochemical Synthesis of Conducting Polymers Involving Deep Eutectic Solvents

2020 ◽  
Vol 16 (4) ◽  
pp. 478-494 ◽  
Author(s):  
Florentina Golgovici ◽  
Liana Anicai ◽  
Andreea Florea ◽  
Teodor Visan
Keyword(s):  
Ionic Liquids ◽  
Conducting Polymers ◽  
Electrochemical Synthesis ◽  
Conductive Polymers ◽  
Electrochemical Polymerization ◽  
Choline Chloride ◽  
Deep Eutectic Solvents ◽  
Widespread Application ◽  
Eutectic Mixtures ◽  
New Findings

Background: Deep eutectic solvents (DESs) represent a new generation of ionic liquids which are widely promoted as “green solvents”. They are gaining widespread application in materials chemistry and electrochemistry. DESs are defined as eutectic mixtures of quaternary ammonium salt with a hydrogen bond donor in certain molar ratios. Their use as solvents for electrochemical synthesis of conducting polymers could influence the polymer properties and reduce their economic cost. Objective: This review presents the most recent results regarding the electropolymerization of common conductive polymers involving choline chloride based ionic liquids. New findings from our laboratory on the electrochemical growth of conductive polymers are also discussed. Methods: The electrochemical polymerization mechanisms during synthesis of polypyrrole (PPy), polyaniline (PANI) and poly(3,4-ethylenedioxythiophene) (PEDOT) using various formulations of DESs are reviewed, as well as their characteristics, mainly from surface morphology view point. Results: Some general information related to the preparation and characterization of DESs is also presented, followed by an overview of the recent advances in the field of electropolymerization using DESs. Conclusion: Electropolymerization of conducting polymers involving DESs represents an attractive route of synthesis due to their compositional flexibility which makes possible the preparation of unlimited formulations further influencing the polymer morphology and properties. The use of these inexpensive eutectic mixtures has a large potential to contribute to the development of more sustainable technological processes meeting many of the required features characteristic to the green chemistry.

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