Liquid−Liquid Equilibrium in Systems with an Ionic Liquid: Experimental Data for an Example of the Biphasic Acid Scavenging Utilizing Ionic Liquids Process

Sahandzhieva, Katya; Naydenov, Deyan; Kamps, Álvaro Pérez-Salado; Bart, Hans‐Jörg; Maurer, Gerd

doi:10.1021/je1004966

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…The ILs such as 1methylimidazolium chloride (MIMCl, 98%), 1-ethyl-3-methylimidazolium chloride (EMIMCl, >98%), and 1-butyl-3methylimidazolium chloride (BMIMCl, 99%) were purchased from Iolitec GmbH. These ILs are solid at room temperature and their melting points are 86, 46 89, 47 and 70 °C, 48 respectively. Ultrapure water (Millipore) was used and the pH of the dispersions were adjusted to 4 or 10 with HCl or KOH, respectively.…”

Section: ■ Introductionmentioning

confidence: 99%

Stability of Titania Nanomaterials Dispersed in Aqueous Solutions of Ionic Liquids of Different Alkyl Chain Lengths

Rouster

Pavlović²,

Cao

et al. 2019

J. Phys. Chem. C

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Charging and aggregation of titania nanosheets (TNS) and spherical titania nanoparticles (TNP) were studied in aqueous solutions of ionic liquids. The pH and the length of the alkyl chain of the IL cations [1-methylimidazolium (MIM+), 1-ethyl-3-methylimidazolium (EMIM+), and 1-butyl-3-methylimidazolium (BMIM+)] were systematically varied in the experiments. No detectable interaction was observed between the IL cations and the positively charged TNS or TNP surfaces at low pH, where the imidazolium derivatives are the co-ions. For the negatively charged titania nano-objects, significant adsorption of MIM+ and EMIM+ took place, leading to charge neutralization and overcharging at appropriate concentrations. The BMIM+ behaved like a simple salt constituent causing charge screening. For both TNS and TNP, the MIM+ < EMIM+ < BMIM+ counterion order was obtained in the critical coagulation concentrations, indicating that MIM+ was the most effective in destabilization of the dispersions. The major interparticle forces were of electrostatic origin; however, viscous stabilization was also observed at high IL concentrations. The same aggregation mechanism and charging behavior were found for the titania nano-objects irrespective of their shape. The results shed light on the hydrophilic nature of the surface of the TNS and TNP of negative charge, in contrast to earlier findings with hydrophobic colloidal particles, where the increasing alkyl chain length gave rise to higher destabilization power. The charging properties were governed by specific adsorption of the IL constituents, while the major interparticle forces were qualitatively well-predicted by the Derjaguin, Landau, Verwey, and Overbeek theory.

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Section: ■ Introductionmentioning

confidence: 99%

Stability of Titania Nanomaterials Dispersed in Aqueous Solutions of Ionic Liquids of Different Alkyl Chain Lengths

Rouster

Pavlović²,

Cao

et al. 2019

J. Phys. Chem. C

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“…A more modern approach can rely on the use of ionic liquid formation to scavenge the inorganic acid as a biphasic liquid. 35 Relying on high avidity of certain moieties to react, some scavenger strategies use an insoluble polymer (a resin) coupled with a reactive entity to scavenge specific reagent that could thus be used in large excess. For example, an aldehyde moiety can be couple onto a resin to scavenge excess of reactive amine.…”

Section: What Is a Scavenger?mentioning

confidence: 99%

“…To avoid such phenomenon, hydrogen‐less amine can be used in excess, like triethylamine, to scavenge the HCl molecules produced. A more modern approach can rely on the use of ionic liquid formation to scavenge the inorganic acid as a biphasic liquid 35 …”

Section: Introductionmentioning

confidence: 99%

Melatonin facts: Lack of evidence that melatonin is a radical scavenger in living systems

Boutin,

Liberelle,

Yous

et al. 2023

Journal of Pineal Research

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Melatonin is a small natural compound, so called a neuro‐hormone that is synthesized mainly in pineal gland in animals. Its main role is to master the clock of the body, under the surveillance of light. In other words, it transfers the information concerning night and day to the peripheral organs which, without it, could not “know” which part of the circadian rhythm the body is in. Besides its main circadian and circannual rhythms mastering, melatonin is reported to be a radical scavenger and/or an antioxidant. Because radical scavengers are chemical species able to neutralize highly reactive and toxic species such as reactive oxygen species, one would like to transfer this property to living system, despite impossibilities already largely reported in the literature. In the present commentary, we refresh the memory of the readers with this notion of radical scavenger, and review the possible evidence that melatonin could be an in vivo radical scavenger, while we only marginally discuss here the fact that melatonin is a molecular antioxidant, a feature that merits a review on its own. We conclude four things: (i) the evidence that melatonin is a scavenger in acellular systems is overwhelming and could not be doubted; (ii) the transposition of this property in living (animal) systems is (a) theoretically impossible and (b) not proven in any system reported in the literature where most of the time, the delay of the action of melatonin is over several hours, thus signing a probable induction of cellular enzymatic antioxidant defenses; (iii) this last fact needs a confirmation through the discovery of a nuclear factor—a key relay in induction processes—that binds melatonin and is activated by it and (iv) we also gather the very important description of the radical scavenging capacity of melatonin in acellular systems that is now proven and shared by many other double bond‐bearing molecules. We finally discussed briefly on the reason—scientific or else—that led this description, and the consequences of this claim, in research, in physiology, in pathology, but most disturbingly in therapeutics where a vast amount of money, hope, and patient bien‐être are at stake.

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Sustainable Energy Supply by Absorption Chillers and Heat Pumps Using Multifunctional Working Pairs

Schneider

Seiler

2011

Chemie Ingenieur Technik

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Sustainable Energy Supply by Absorption Chillers and Heat Pumps Using Multifunctional Working PairsEnergy efficient, sustainable technologies for cooling and heating represent major pillars of the megatrends resource efficiency and globalization of technologies. Cooling and heating cycles, using renewable energies or waste heat rather than conventionally generated electricity, contribute to sustainably address issues like industrial or comfort cooling with a substantially reduced carbon footprint. In this context, absorption chillers or heat pumps represent a promising technology.However, working pair related drawbacks such as crystallization, corrosion, and instability limit the market penetration.This contribution indicates how new working pairs based on ionic liquids can eliminate a number of state-of-the-art drawbacks and thereby allow leveraging unused energetic potentials in a sustainable manner.

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Liquid−Liquid Equilibrium in Systems with an Ionic Liquid: Experimental Data for an Example of the Biphasic Acid Scavenging Utilizing Ionic Liquids Process

Cited by 6 publications

References 2 publications

Stability of Titania Nanomaterials Dispersed in Aqueous Solutions of Ionic Liquids of Different Alkyl Chain Lengths

Stability of Titania Nanomaterials Dispersed in Aqueous Solutions of Ionic Liquids of Different Alkyl Chain Lengths

Melatonin facts: Lack of evidence that melatonin is a radical scavenger in living systems

Sustainable Energy Supply by Absorption Chillers and Heat Pumps Using Multifunctional Working Pairs

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