scholarly journals X-Ray structure and ionic conductivity studies of anhydrous and hydrated choline chloride and oxalic acid deep eutectic solvents

2018 ◽  
Vol 20 (48) ◽  
pp. 30120-30124 ◽  
Author(s):  
Lorenzo Gontrani ◽  
Matteo Bonomo ◽  
Natalia V. Plechkova ◽  
Danilo Dini ◽  
Ruggero Caminiti
Keyword(s):  
Molecular Dynamics ◽  
Ionic Conductivity ◽  
Oxalic Acid ◽  
Choline Chloride ◽  
Deep Eutectic Solvents ◽  
X Ray ◽  
Effect Of Water ◽  
Shed Light

X-Ray, conductivity and molecular dynamics studies shed light on the effect of water of crystallization on choline chloride–oxalic acid DESs

Deep eutectic solvent delignification: Impact of initial lignin

BioResources ◽  
2017 ◽  
Vol 12 (4) ◽  
pp. 7301-7310
Author(s):  
Veronika Majová ◽  
Silvia Horanová ◽  
Andrea Škulcová ◽  
Jozef Šima ◽  
Michal Jablonský
Keyword(s):  
Lactic Acid ◽  
Oxalic Acid ◽  
Lignin Content ◽  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
Deep Eutectic Solvents ◽  
Kappa Number ◽  
Kraft Pulps ◽  
Oxygen Delignification ◽  
Detailed Understanding

This study aimed to resolve the issue of the lack of detailed understanding of the effect of initial lignin content in hardwood kraft pulps on pulp delignification by deep eutectic solvents. The authors used Kappa number of the concerned pulp, intrinsic viscosity, and selectivity and efficiency of delignification as the parameters of the effect. The pulp (50 g oven dry pulp) was treated with four different DESs systems based on choline chloride with lactic acid (1:9), oxalic acid (1:1), malic acid (1:1), and system alanine:lactic acid (1:9); the results were compared to those reached by oxygen delignification. The results showed that the pulp with a higher initial lignin content had a greater fraction of easily removed lignin fragments.

scholarly journals Ab Initio Molecular Dynamics Investigations of the Speciation and Reactivity of Deep Eutectic Electrolytes in Aluminum Batteries

2021 ◽  
Author(s):  
David Carrasco-Busturia ◽  
Steen Lysgaard ◽  
Piotr Jankowski ◽  
Tejs Vegge ◽  
Arghya Bhowmik ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Ab Initio ◽  
Deep Eutectic Solvents ◽  
Ionic Species ◽  
Electrochemical Activity ◽  
Molecular Composition ◽  
Ab Initio Molecular Dynamics ◽  
The Stability ◽  
Shed Light ◽  
Battery Anode

Deep eutectic solvents (DES) have emerged as an alternative for conventional ionic<br>liquids in aluminum batteries. Elucidating DES composition is fundamental to<br>understand aluminum electrodeposition in the battery anode. Despite numerous<br>experiemental efforts, the speciation of these DES remains elusive. This work shows<br>how \textit{Ab initio} molecular dynamics (AIMD) simulations can shed light on the<br>molecular composition of DES. For the particular example of AlCl$_{3}$:urea, one of<br>the most popular DES, we carried out a systematic AIMD study, showing how an<br>excess of AlCl$_{3}$ in the AlCl$_{3}$:urea mixture promotes the stability of ionic<br>species vs neutral ones and also favors the reactivity in the system. These two facts<br>explain the experimentally observed enhanced electrochemical activity in salt-rich<br>DES. We also observe the transfer of simple $[$AlCl$_{x}$(urea)$_{y}]$ clusters<br>between different species in the liquid, giving rise to free $[$AlCl$_{4}]^{-}$ units. The<br>small size of these $[$AlCl$_{4}]^{-}$ units favors the transport of ionic species towards<br>the anode, facilitating the electrodeposition of aluminum.

Corrosion Processes of Uranus B6 and Monel 400 Special Alloys in Deep Eutectic Solvents

2019 ◽  
Vol 70 (8) ◽  
pp. 2968-2972
Author(s):  
Elena Ionela Neacsu ◽  
Virgil Constantin ◽  
Cristina Donath ◽  
Kazimir Yanushkevich ◽  
Aliona Zhivulka ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Corrosion Behaviour ◽  
Choline Chloride ◽  
Deep Eutectic Solvents ◽  
Corrosion Process ◽  
Specific Magnetization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Before And After ◽  
Monel 400

The corrosion behaviour of special alloys (Uranus B6 steel and Monel 400) exposed to chlorine chloride-deep eutectic solvents (DES) at 353 K has been investigated by polarization curves method. The corresponding corrosion parameters in choline chloride-oxalic acid and choline chloride-malonic acid were calculated. Micrographic images before and after immersion in the corrosive medium were obtained. Measurements of the influence of the corrosion process on the crystal structure and specific magnetization of the studied steels was carried out by using X-ray diffraction and respectivelly ponderomotive methods.

scholarly journals Study on catalytic conversion of cellulose to 5-Hydroxymethyl furfural by directional degradation in deep eutectic solvent

BioResources ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 3344-3355
Author(s):  
Hongyan Yang ◽  
Jinyan Lang ◽  
Junliang Lu ◽  
Ping Lan ◽  
Heng Zhang
Keyword(s):  
Green Chemistry ◽  
Oxalic Acid ◽  
Microcrystalline Cellulose ◽  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
Deep Eutectic Solvents ◽  
Direct Conversion ◽  
Metal Chlorides ◽  
Hydroxymethyl Furfural ◽  
New Type

The direct conversion of microcrystalline cellulose (MCC) degrading into 5-hydroxymethyl furfural (5-HMF) was studied using four synthetic deep eutectic solvents (DESs) as solvents and choosing four metal chlorides as catalysts. The factors that affected the yields of the products, such as the type of DESs, the type and dosage of catalysts, the ratio of DESs to MCC, and reaction temperature were researched. It was found that the DES synthesized from oxalic acid and choline chloride (O-DES) and SnCl4 showed the better performance. The highest 5-HMF and glucose yields of 11.0% and 22.0% were obtained, respectively, for a reaction carried out at 160 °C for 90 min in O-DES (the ratio of it to MCC was 25:1) using 1.42 wt% SnCl4 as the catalyst. As a new type of dissolution and catalysis system, the DESs were not only cheaper but also easy to obtain. Most importantly, the realization of the concept of green chemistry was achieved in this study.

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