Bibliographies thématiques / Aqueous ionic liquid

Littérature scientifique sur le sujet « Aqueous ionic liquid »

Auteur : Grafiati
Publié le 18 mai 2024

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Articles de revues sur le sujet "Aqueous ionic liquid"

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Zafarani-Moattar, Mohammad Taghi, Hemayat Shekaari et Elnaz Mazaher Haji Agha. « Measurement and Modeling of Solubility of Galactose in Aqueous Ionic Liquids, 1-Butyl-3-Methyl Imidazolium Bromide, 1-Hexyl-3-Methyl Imidazolium Bromide and 1-Butyl-3-Methylimidazolium Chloride at T = (298.15 And 308.15) K ». Pharmaceutical Sciences 25, no 4 (20 décembre 2019) : 319–30. http://dx.doi.org/10.15171/ps.2019.32.

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Background: Saccharides are considered as abundant, cheap and renewable starting materials for chemicals and fuels. Recently, ionic liquids have been used as green solvents for saccharides. The solubility values of galactose in aqueous ionic liquid solutions are not available. Thus, the main objective of this research was to determine the solubility of galactose in aqueous solutions containing ionic liquids, 1-butyl-3-methyl imidazolium bromide, [BMIm]Br, 1-butyl-3-methylimidazolium chloride [BMIm]Cl and 1-hexyl-3-methyl imidazolium bromide, [HMIm]Br at different mole fractions of ionic liquids at T = (298.15 and 308.15) K. Methods: In this study, the gravimetric method was used to measure the solubility of galactose in aqueous ionic liquids solutions. Results: The solubility values of galactose in water and aqueous ionic liquid solutions were correlated with the activity coefficient models of Wilson, NRTL, modified NRTL, NRF-NRTL, and UNIQUAC. Conclusion: It was concluded that with increasing the mole fraction of ionic liquids, the solubility values of galactose decrease and in fact all of these ionic liquids show salting-out effect on aqueous galactose solutions and this behavior is stronger in ionic liquid 1-butyl-3-methylimidazolium chloride.
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Mohammed, Sawsan A. M., et Mohammed Saadi Hameed. « Extraction of Phenol from Aqueous Solutions Using Bulk ionic Liquid Membranes ». Iraqi Journal of Chemical and Petroleum Engineering 17, no 1 (30 mars 2016) : 83–97. http://dx.doi.org/10.31699/ijcpe.2016.1.8.

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Room temperature ionic liquids show potential as an alternative to conventional organic membrane solvents mainly due to their properties of low vapour pressure, low volatility and they are often stable. In the present work, the technical feasibilities of room temperature ionic liquids as bulk liquid membranes for phenol removal were investigated experimentally. In this research several hydrophobic ionic liquids were synthesized at laboratory. These ionic liquids include (1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide[Bmim][NTf2], 1-Hexyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide[Hmim][NTf2], 1-octyl-3-methylimidazolium bis (trifluoromethylsulfonyl)imide[Omim][NTf2],1‐butyl‐1‐methylimidazoliumhexafluorophosphate[Bmim][PF6], 1‐hexyl‐1‐methylimidazoliumhexafluorophosphate[Hmim][PF6], 1-butyl-1-methylpyrrolidinium bis (trifluoromethylsulfonyl) imide[Bmpyr][NTf2], and 1-octyl-3-methyl imidazolium tetra fluoroborate[Omim][BF4]. The distribution coefficients for phenol in these ionic liquids were measured at different pH values and found to be much larger than those in conventional solvents. Through the values of the distribution coefficients and the experiments that were conducted on bulk liquid membrane applying various types of prepared ionic liquids, 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide was selected as the best ionic liquid which gave the highest extraction and stripping efficiencies. The effect of several parameters, namely, feed phase pH(2-12), feed concentration(100-1000 ppm), NaOH concentration(0-0.5M), temperature (20-50oC), feed to membrane volume ratio (200-400ml/80ml ionic liquid) and stirring speeds(75-125 rpm) on the performance of the choosen ionic liquid membrane were also studied. The preliminary study showed that high phenol extraction and stripping efficiencies of 97% and 95% respectively were achieved by ionic liquid membrane with a minimum membrane loss which offers a better choice to organic membrane solvents.
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Ressmann, Anna K., Ronald Zirbs, Martin Pressler, Peter Gaertner et Katharina Bica. « Surface-active Ionic Liquids for Micellar Extraction of Piperine from Black Pepper ». Zeitschrift für Naturforschung B 68, no 10 (1 octobre 2013) : 1129–37. http://dx.doi.org/10.5560/znb.2013-3196.

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We present the application of ionic liquid-aqueous micellar solutions as isolation media for the pharmaceutically active ingredient piperine from black pepper. Several surface-active ionic liquids including a biodegradable betaine derivative were used for the extraction of piperine, and a strong correlation between extraction yield and the critical micelle concentration of the respective ionic liquid was found. A scaled strategy for the isolation of piperine was developed that allowed recovery and recycling of the aqueous ionic liquid micellar solution for five runs without any loss in extraction efficiency.
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Turanov, A. N., V. K. Karandashev, O. I. Artyushin et E. V. Sharova. « Effect of 1-alkyl-3-methylimidazolium di-2-ethylhexylsulfosuccinate on the extraction of lanthanides(III) with 1,3-bis[(diphenylphosphorylacetamido)methyl]benzene from nitric acid solutions ». Журнал общей химии 93, no 11 (15 décembre 2023) : 1744–52. http://dx.doi.org/10.31857/s0044460x23110112.

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It was found that the efficiency of extraction of lanthanide(III) ions from nitric acid solutions with 1,3-bis[(diphenylphosphorylacetamido)methyl]benzene significantly increases in the presence of ionic liquids, 1-alkyl-3-methylimidazolium di-2-ethylhexylsulfosuccinates, in the organic phase. The partition of ionic liquids between the organic and aqueous phases was studied depending on the concentration of the ionic liquid and nitric acid. The stoichiometry of the extractable lanthanide(III) complexes was determined by the equilibrium shift method. The influence of the length of alkyl radicals in the cationic part of the ionic liquid and the concentration of HNO3 in the aqueous phase on the efficiency of the extraction of metal ions into the organic phase containing the ionic liquid was considered.
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Zeindlhofer, Veronika, et Christian Schröder. « Computational solvation analysis of biomolecules in aqueous ionic liquid mixtures ». Biophysical Reviews 10, no 3 (23 avril 2018) : 825–40. http://dx.doi.org/10.1007/s12551-018-0416-5.

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Abstract Based on their tunable properties, ionic liquids attracted significant interest to replace conventional, organic solvents in biomolecular applications. Following a Gartner cycle, the expectations on this new class of solvents dropped after the initial hype due to the high viscosity, hydrolysis, and toxicity problems as well as their high cost. Since not all possible combinations of cations and anions can be tested experimentally, fundamental knowledge on the interaction of the ionic liquid ions with water and with biomolecules is mandatory to optimize the solvation behavior, the biodegradability, and the costs of the ionic liquid. Here, we report on current computational approaches to characterize the impact of the ionic liquid ions on the structure and dynamics of the biomolecule and its solvation layer to explore the full potential of ionic liquids.
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Cubova, Katerina, Miroslava Semelova, Mojmir Nemec et Vit Benes. « Liquid-Liquid Extraction of Ferric Ions into the Ionic Liquids ». Minerals 12, no 1 (22 décembre 2021) : 11. http://dx.doi.org/10.3390/min12010011.

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Imidazolium ionic liquids containing acetylacetone, thenoyltrifluoroacetone, or 8-hydroxyquinoline, respectively, were used as the extracting agents for the separation of traces of iron (III) from its aqueous solutions with or without citric and oxalic acids. The results show that 8-hydroxyquinoline in imidazolium ionic liquids extract iron quantitatively from all the tested solutions including complexing ones, regardless of indications of unexpected iron behavior/speciation.
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Kurnia, Kiki Adi, Ana M. Fernandes, Simão P. Pinho et João A. P. Coutinho. « Ion speciation : a key for the understanding of the solution properties of ionic liquid mixtures ». Physical Chemistry Chemical Physics 21, no 38 (2019) : 21626–32. http://dx.doi.org/10.1039/c9cp04533c.

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Papaiconomou, Nicolas, Isabelle Billard et Eric Chainet. « Extraction of iridium(iv) from aqueous solutions using hydrophilic/hydrophobic ionic liquids ». RSC Adv. 4, no 89 (2014) : 48260–66. http://dx.doi.org/10.1039/c4ra06991a.

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Removal of iridium(iv) using hydrophilic or hydrophobic ionic liquids was studied. IrCl62− anionic metal complexes were precipitated out from water using bromide-based ionic liquids, yielding water-insoluble salts with low Ks values. Liquid–liquid extraction of Ir(iv) using [NTf2]-based ionic liquids yielded distribution coefficients up to 70 with [OMIM][NTf2] at pH 2.
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Zhang, Guo Feng, Xiu Jie Ji, Bo Wen Cheng, Jun Song, Fei Lu, Ran Ran Fu, Jie Ru Huang et al. « A Green Procedure for the Ionic Liquid Catalyzed Oxidation of Benzylic Alcohols to Aldehydes or Ketones in Aqueous Media ». Advanced Materials Research 873 (décembre 2013) : 567–70. http://dx.doi.org/10.4028/www.scientific.net/amr.873.567.

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A green oxidation of benzylic alcohols to the corresponding aldehydes or ketones was achieved in aqueous media using ionic liquid/H2O2/HCl catalytic oxidation system. The procedure is mild, environment-friendly and simple. Ionic liquids can be successfully recovered and reused for the oxidation of the same (different) substance. The directing effect of the ionic liquid is supported by the good selectivities and yields. These reactions demonstrate the catalytic oxidation and phase transfer function of the ionic liquid is stronger than that without ionic liquid.
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Yao, Tian, Shun Yao, Dan Tang, Long Jing, Daocai Wang et Hang Song. « Synthesis, magnetism, aqueous-two phase formation and physical properties of novel guanidinium-based magnetic ionic liquids ». RSC Advances 6, no 58 (2016) : 52898–904. http://dx.doi.org/10.1039/c6ra09879g.

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Thèses sur le sujet "Aqueous ionic liquid"

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Stoffers, Martin [Verfasser]. « Liquid-Liquid Extraction of n-Butanol from Aqueous Solutions Using Ionic Liquids / Martin Stoffers ». München : Verlag Dr. Hut, 2014. http://d-nb.info/1055863524/34.

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Passos, Helena Isabel Sousa. « Extraction of bioactive compounds with ionic liquid aqueous solutions ». Master's thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/9694.

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Mestrado em Engenharia Química
O principal objetivo do presente trabalho é estudar a aplicação dos líquidos iónicos (LIs) na formação de sistemas aquosos bifásicos (SAB) e avaliar a sua capacidade para extrair compostos bioativos. Deste modo, este estudo foca essencialmente a procura de sistemas mais benignos, através da aplicação de sais orgânicos, e uma melhor compreensão dos mecanismos que regem a partição de biomoléculas entre as duas fases destes sistemas. Os SAB constituídos por LIs apresentam uma grande aplicabilidade na extração e purificação de uma vasta gama de compostos, sendo capazes de preservar as suas características. Assim, com o intuito de fomentar os estudos efetuados nesta área, e de melhorar a performance destes sistemas, iniciou-se o presente trabalho com a caracterização de SAB compostos por vários LIs e o sal orgânico citrato de potássio. O conjunto de LIs selecionados permitiu estudar o efeito da natureza do anião e do catião central sobre a capacidade de formação destes sistemas. Adicionalmente analisou-se o efeito do tamanho da cadeia alquílica do catião imidazólio e o efeito do pH. A extração de um conjunto de alcaloides foi efetuada, não apenas para verificar a aplicabilidade dos SAB compostos por LIs e um sal orgânico, mas também para estudar o efeito da agregação dos LIs, e o seu consequente impacto na partição de diferentes biomoléculas. Os resultados obtidos mostraram que a agregação dos LIs tem um efeito significativo e permite uma manipulação das extrações. Por fim, investigou-se a aplicabilidade dos SAB compostos por LIs na extração e concentração de compostos que apresentam riscos para a saúde humana. Normalmente, a baixa concentração do bisfenol A (um disruptor endócrino) nos fluídos humanos dificulta a sua deteção através de técnicas analíticas convencionais. Estudou-se o efeito do catião central e otimizaram-se as condições de extração. Os resultados obtidos demonstraram uma elevada capacidade de extração por parte dos SAB selecionados e a possibilidade de concentrar até 100 vezes o bisfenol A presente nos fluidos biológicos.
The main objective of the present work is to study the application of ionic liquids (ILs) in the formation of aqueous two-phase systems (ATPS) and to evaluate their capability in the extraction of bioactive compounds. This study is essentially focused on the finding of more benign systems, making use of organic salts, and in the gathering of a deeper understanding on the mechanisms which rule the partitioning of biomolecules between the coexisting phases of ATPS. IL-based ATPS display a widespread applicability in the extraction and purification of a large range of compounds, while preserving their characteristics. Thus, with the purpose of fostering the studies conducted in this area and to improve the performance of these systems, this work starts with the characterization of ATPS composed of several ILs and the organic salt potassium citrate. The selected ILs allowed the study of the effect of the anion nature and cation core towards the phase diagrams behavior. Additionally, it was analyzed the influence of the imidazolium cation alkyl side chain length, as well as the pH, in the formation of these systems. The extraction of a series of alkaloids was carried out not only to verify the applicability of ATPS formed by imidazolium-based ILs and an organic salt, but also to study the effect of the ILs self-aggregation and subsequent impact on the partitioning pathway of different biomolecules. The obtained results show that the self-aggregation of ILs has a significant effect and allows tailored extractions. Finally, the actual applicability of IL-based ATPS in the extraction and concentration of compounds of human concern from biological fluids was investigated. Usually, the low concentrations of bisphenol A, an endocrine disruptor, in human fluids make it difficult to detect via conventional techniques. The effect of the IL cation core was investigated and the extraction conditions were optimized. The results showed a high extraction efficiency and concentration up to 100-fold of bisphenol A from biological fluids.
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Gomes, Hugo André do Monte. « Extraction of caffeine from spent coffee using aqueous solutions of ionic liquids ». Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/19137.

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Mestrado em Engenharia Química
The main objective of this work consists on the development of a more benign and efficient technique for the extraction of added-value compounds from biomass. In particular, the use of ionic liquids (ILs) for the extraction of caffeine from spent coffee was investigated. This compound display important properties with relevance in food, pharmaceutical, cosmetic and agrochemical industries. Spent coffee grounds (SCG) are a waste product without commercial value, being thus a raw material with virtually no cost and with a huge potential of value-added compounds able to be extracted. To this end, solid-liquid extractions from biomass were carried out using aqueous solutions of various ILs as well as mixtures of ILs and salts. As a first attempt, several protic Ils (PILs) were synthesized and characterized. These were chosen since they have unique characteristics that facilitate their recovery as well as the separation of the extracted components. The results obtained indicate that triethanolammonium acetate is the best candidate to extract caffeine. More specifically, at the concentration of 2 M, a temperature of 358 K (85°C), a solid-liquid ratio of 0,1 and 45 minutes of extraction time, it was achieved a value of extracted caffeine of 3.01% (w/w). Aqueous solutions of different aprotic ILs, with a common cholinium cation, were also investigated for the extraction of caffeine. A factorial planning was carried out in order to identify the optimum operating conditions. The optimum operating conditions for caffeine extraction with aqueous solutions of cholinium bicarbonate were obtained in the following conditions: time of 30 minutes, temperature of 323 K (50°C), solid-liquid ratio of 0.05 and LI concentration of 1.5 M, where the value of caffeine extraction obtained was of 1.85% (w/w). Mixtures of salts with hydrotropic characteristics with ILs were finally investigated for the extraction of caffeine in order to combine the properties of both classes of compounds. It has been found that the compounds containing the tosylate anion have a higher ability to extract caffeine. In addition, the LI 1-butyl-3-methylimidazolium tosylate or an equimolar mixture of sodium tosylate with 1-butyl-3-methylimidazolium chloride, lead to similar values of extracted caffeine. More specifically, for a concentration of 1M, the value obtained for the extraction of caffeine was of 3.50% (w/w), at a temperature of 348 K (75°C), extraction time of 30 minutes and solid-liquid ratio of 1:10. In summary, this thesis describes the application of aqueous solutions of ILs foreseeing the development of more efficient and sustainable extractive processes.
O principal objetivo desta dissertação recai sob o estudo de técnicas de extração alternativas de compostos de valor acrescentado a partir de biomassa, mais benignas e eficientes do que as habitualmente utilizadas. Em particular, estudou-se a utilização de soluções aquosas de líquidos iónicos (LIs) para a extração de cafeína a partir de borras de café. O interesse da extração deste composto deve-se às suas propriedades e consequente interesse pelas indústrias alimentar, farmacêutica, cosmética e agroquímica. De salientar ainda que as borras de café são um produto residual sem valor associado, constituindo uma matéria-prima praticamente sem custos e com um enorme potencial de compostos químicos de valor acrescentado passíveis de serem extraídos. Para tal, efetuaram-se extrações do tipo sólido-líquido a partir de borras de café utilizando várias soluções aquosas de LIs, assim como misturas de LIs com sais. Começou-se pela síntese de líquidos iónicos próticos (LIPs) e sua caracterização. A utilização de LIPs prende-se com o facto de possuírem características muito singulares que facilitariam a recuperação bem como a separação dos compostos extraídos. Os resultados obtidos mostraram, que dos LIPs sintetizados, o mais promissor na extração de cafeína foi o acetato de trietanolamina. Mais concretamente, para uma concentração de 2 M, uma temperatura de 358 K (85˚C), uma razão sólido-liquido de 0,1 e um tempo de extração de 45 minutos, conseguiu-se obter uma percentagem de cafeína extraída de 3,01% (m/m). Também se estudou a otimização da extração da cafeína de borras de café utilizando como solvente soluções aquosas de diferentes LIs apróticos, com o catião colínio em comum, em que se recorreu a um planeamento fatorial por forma a obter o ponto ótimo de extração, relativamente à temperatura, razão sólido-liquido, tempo e concentração do LI. Verificou-se que o ponto ótimo de operação para a extração de cafeína com soluções aquosas de bicarbonato de colínio ocorre para um tempo de 30 minutos, um temperatura de 323 K (50ºC), uma razão sólido-liquido de 0,05 e concentração de LI de 1,5 M, onde a extração de cafeína obtida foi de 1,85% (m/m). Foram também testadas misturas de sais com atividade hidrotrópica com LIs apróticos, com um catião imidazólio em comum, a fim de conjugar as propriedades de ambos os compostos de forma a potenciar a extração de cafeína. Constatou-se que os compostos (sal ou LI) que contêm o anião tosilato tem capacidade de extrair uma maior percentagem de cafeina. Os valores de extração obtidos, utilizando o LI tosilato de 1-butil-3-metilimidazólio ou uma mistura equimolar de tosilato de sódio com cloreto de 1-butil-3-metilimidazólio, foram semelhantes, sendo que para a concentração de 1M a extração de cafeina foi de 3,50 % (m/m), a uma temperatura de 348 K (75ºC), tempo de 30 minutos e razão sólido-liquido de 1:10. Em suma, esta tese descreve a aplicação de soluções aquosas LIs visando o desenvolvimento de processos extrativos mais eficientes e sustentáveis.
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Li, Qi. « Experimental and numerical investigations of ionic liquid-aqueous microchannel extractions ». Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10054094/.

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The thesis presents investigations on the process intensification behaviour in small scale separators operating in plug (segmented) flow. The continuous extraction behaviour, as well as the hydrodynamic characteristics of the liquid-liquid flow in microchannels is numerically and experimentally studied. The interphase mass transfer process using the extractant species Europium (III) as tracer was observed and quantified. The Eu(III) microfluidic extraction from nitric acid solutions was carried out in 0.2 mm and 0.5 mm channels using an ionic liquid solution (0.2M n-octyl(phenyl)-N,Ndiisobutylcarbamoylmethyphosphine oxide (CMPO) -1.2M Tributylphosphate) (TBP)/1-butyl- 3-methylimidazolium bis[(trifluoromethyl)sulfonyl]amide; ([C4min][NTf2]) as the extraction phase. Distribution and mass transfer coefficients were found to have maximum values at nitric acid concentration of 1M. Mass transfer coefficients were higher in the small channel, where recirculation within the plugs and interfacial area are large, compared to the large channel for the same mixture velocities and phase flow rates. Within the same channel, mass transfer coefficients decreased with increasing residence time indicating that significant mass transfer takes place at the channel inlet where the two phases come into contact. The experimental results were compared with previous correlations on mass transfer coefficients in plug flows. To better characterize the microfluidic flow, bright field Micro-Particle Image Velocimetry and high speed imaging were employed to measure velocity profiles and to obtain the geometric characterstics of the plug flow for the 1M HNO3 solution that was used in the extraction experiments. Correlations regarding film thickness, plug velocity and plug length are developed based dimensionless parameters. It was found that the liquid film surrounding the plug is largely affected by the changes in the front cap for the range of Capillary numbers studied (0.0224< Ca <0.299), while the droplet volume is highly dependent on the channel diameter as well as the mixture velocity. The volume-of-fluid (VOF) method is then used to model the velocities and pressure distribution in the plug flow in the channel and shows good agreement with experimental results and previous models. These features will help in optimizing the microfluidic plug flow for mixing, as well as mass and heat mass transfer enhancement. The mass transfer profiles of the extractant species Eu(III) are also studied using Laser Induced Fluorescence. Recirculation patterns appear in the dispersed aqueous phase from the plug formation stage, and 30-50 % of the mass transfer occurs during plug formation, where new interfaces are formed and mixing is enhanced from the recirculation pattern, especially at high Umix. After experiencing convection and normal diffusion extraction equilibrium achieved, the fluorescent signal in the ionic liquid phase is very strong as Eu(III) transfers into it. The correlations proposed on the hydrodynamics and observations of the mass transfer characteristics during plug flow will contribute to the development of microfluidic devices.
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Young, Taylor Tront. « Lipid Bilayer Formation in Aqueous Solutions of Ionic Liquids ». Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/35292.

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The formation of lipid bilayer membranes between droplets of ionic liquid is presented as a means of forming functional bimolecular networks for use in sensor applications. Ionic liquids are salts that have a number of useful properties, such as low melting points making them liquid at room temperature and exceedingly low vapor pressure. Ionic liquids have seen recent popularity as environmentally friendly industrial solvent alternatives. Our research demonstrates that it is possible to consistently form lipid bilayers between droplets of ionic liquid solutions. Analysis shows that the ionic liquids have negligible effects on the physical stability and electrical properties of the bilayer. It is also shown that the magnitude of the conductance levels of Alamethicin peptide are altered by some ionic liquids.
Master of Science
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Roy, Milan Chandra. « Investigation of assorted interactions of vital compounds aqueous ionic liquid and vitamin solutions and solvent arrangements ». Thesis, University of North Bengal, 2016. http://ir.nbu.ac.in/handle/123456789/2756.

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Li, Zhonghao, et Andreas Taubert. « Cellulose/gold nanocrystal hybrids via an ionic liquid/aqueous precipitation route ». Universität Potsdam, 2009. http://opus.kobv.de/ubp/volltexte/2010/4504/.

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Injection of a mixture of HAuCl4 and cellulose dissolved in the ionic liquid (IL) 1-butyl-3-methylimidazolium chloride [Bmim]Cl into aqueous NaBH4 leads to colloidal gold nanoparticle/cellulose hybrid precipitates. This process is a model example for a very simple and generic approach towards (noble) metal/cellulose hybrids, which could find applications in sensing, sterile filtration, or as biomaterials.
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Radjenovic, P. M. « Novel ionic liquid based electrolytes for non-aqueous lithium-oxygen batteries ». Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3019782/.

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Superoxide (O2•-) is the key discharge intermediary driving many non-aqueous metal-oxygen (M-O2) battery chemistries.1–4 Characteristic dioxygen (O2x, where x = -2, -1, 0, +1) stretching vibrations (νO-O) have been well documented spectroscopically in numerous chemically unique systems.5–8 Therefore, the O2•- intermediary can be used as a diagnostic molecule to spectroscopically probe electrolyte effects on O2 reduction-evolution reaction (OR/ER) processes at the electrode/electrolyte interface, providing fundamental insight into non-aqueous M-O2 reaction mechanisms. However, it is first important to understand the vibrational spectra of O2x, though a concise overview of the large amount of empirical data in different chemical environments is lacking. Herein, reviewing the spectroscopy of O2•- and other O2x species gave a good spectroscopic grounding that supported in situ spectroscopic studies of OR/ERs in novel ionic liquid (IL) based electrolytes. Fundamental studies of OR/ERs at the roughened gold (rAu) model electrode interface in a variety of IL electrolytes using in situ surface enhanced Raman spectroscopy (SERS) were performed to study IL cation and anion effects on the chemical nature of O2•-. Analysis of νO-O and IL vibrational peak intensities and Stark shifts provided valuable information about electrolyte interactions. Furthermore, IL:solvent (IL:sol) blended electrolytes were studied to determine the effect of the solvent and salt additives on the properties of the IL electrolyte. Overall, four key parameters were shown to affect the chemical nature of O2•- at the electrode/electrolyte interface, the: (1) IL cation, (2) IL anion, (3) solvent additive Gutmann acceptor/donor number (AN/DN) and (4) the electrode potential. To optimise various physicochemical properties of the electrolyte, A general heuristic methodology for “tailoring”, screening and optimising the electrolyte was developed and a series of novel electrolytes were formulated. These novel electrolytes showed improved O2 reduction reaction (ORR) electrochemistry and exceptional stability in contact with lithium metal (Li-metal) with good physicochemical properties. Our study provides valuable information for the design and tailoring of novel IL based electrolytes for Li and other M-O2 batteries.
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Wang, Nan. « CO2 Separation - from Aqueous Amine Solvent to Ionic Liquid-based solvent ». Licentiate thesis, Luleå tekniska universitet, Energivetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-84244.

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Ferreira, Fábio Miguel Mendes. « Valorization of pharmaceutical wastes using ionic liquids ». Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/13789.

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Mestrado em Biotecnologia - Biotecnologia Industrial e Ambiental
The main objective of the present work is the application of aqueous biphasic systems (ABS) with ionic liquids (ILs) in the extraction of pharmaceutical wastes. Nowadays, after their expiration date time recovered medicine waste are incinerated, destroying most of the valuable compounds present, with only a minor thermic valorisation. Therefore the development of new processes that allow this wastes valorization is crucial to create a more environmentally friendly process and the use of wastes as a source of raw materials. The development of new ABS with ILs and their study allowed the optimization of the extraction of paracetamol and caffeine. Finally the application of this simple and fast process to a medical waste (ALGIK) resulted in a complete extraction of both paracetamol and caffeine.
Este trabalho tem como objetivo estudar a aplicação de sistemas aquosos bifásicos (SAB) com líquidos iónicos (LIs) na extração de compostos ativos de resíduos farmacêuticos. Atualmente os medicamentos fora do mercado são recolhidos e incinerados, sendo por isso a totalidade dos compostos ativos de interesse perdidos por combustão completa. Apesar da valorização energética destes resíduos há grandes perdas ao nível dos vários compostos presentes. Deste modo o desenvolvimento de novos processos simples de extração com vista a’ valorização dos compostos ativos presentes nos mesmos é de grande importância, minimizando os impactos ambientais e permitindo a utilização destes resíduos como fonte de matérias primas. Foi possível desenvolver novos SAB com LIs e proceder ao estudo e otimização dos mesmos na extração de cafeína e paracetamol. Por fim o processo otimizado foi aplicado a um resíduo medicamentoso (ALGIK). O resultado obtido demonstra uma completa extração dos compostos ativos com os SAB utilizados.
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Livres sur le sujet "Aqueous ionic liquid"

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Freire, Mara G., dir. Ionic-Liquid-Based Aqueous Biphasic Systems. Berlin, Heidelberg : Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-52875-4.

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Freire, Mara G. Ionic-Liquid-Based Aqueous Biphasic Systems : Fundamentals and Applications. Springer, 2018.

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Freire, Mara G. Ionic-Liquid-Based Aqueous Biphasic Systems : Fundamentals and Applications. Springer London, Limited, 2016.

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Freire, Mara G. Ionic-Liquid-Based Aqueous Biphasic Systems : Fundamentals and Applications. Springer Berlin / Heidelberg, 2016.

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Chapitres de livres sur le sujet "Aqueous ionic liquid"

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Rao, K. Srinivasa, Pankaj Bharmoria, Tushar J. Trivedi et Arvind Kumar. « Self-Assembly of Surface-Active Ionic Liquids in Aqueous Medium ». Dans Ionic Liquid-Based Surfactant Science, 175–92. Hoboken, NJ : John Wiley & Sons, Inc, 2015. http://dx.doi.org/10.1002/9781118854501.ch8.

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Freire, Mara G. « Introduction to Ionic-Liquid-Based Aqueous Biphasic Systems (ABS) ». Dans Green Chemistry and Sustainable Technology, 1–25. Berlin, Heidelberg : Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-52875-4_1.

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Behera, Kamalakanta, Rewa Rai, Shruti Trivedi et Siddharth Pandey. « Surfactant Self-Assembly Within Ionic-Liquid-Based Aqueous Systems ». Dans Green Chemistry and Sustainable Technology, 221–45. Berlin, Heidelberg : Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-52875-4_10.

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Cheng, Yufeng, Weizong Wang, Jinrui Zhang et Guobiao Cai. « Stably electrospraying concentrated aqueous solution with outer ionic liquid ». Dans Aerospace and Associated Technology, 340–44. London : Routledge, 2022. http://dx.doi.org/10.1201/9781003324539-62.

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Andelman, David, Francoise Brochard et Jean-Francois Joanny. « Structured Monolayers of Charged and Polar Molecules at the Liquid/Air Interface ». Dans The Physics and Chemistry of Aqueous Ionic Solutions, 417–27. Dordrecht : Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3911-0_19.

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Singh, Seema, et Blake A. Simmons. « Ionic Liquid Pretreatment : Mechanism, Performance, and Challenges ». Dans Aqueous Pretreatment of Plant Biomass for Biological and Chemical Conversion to Fuels and Chemicals, 223–38. Chichester, UK : John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9780470975831.ch11.

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García, María José Salar, S. Sánchez-Segado, V. M. Ortiz-Martínez, C. Godinez-Seoane et L. J. Lozano-Blanco. « Ionic Liquid Membrane Technology for Heavy Metal Removal from Aqueous Effluents ». Dans Membrane Technologies for Heavy Metal Removal from Water, 242–55. Boca Raton : CRC Press, 2023. http://dx.doi.org/10.1201/9781003326281-14.

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Rahman, Noor A. ’in A., Gowri Selvaraj et Cecilia Devi Wilfred. « Modified Alginate Adsorbent Using Ionic Liquid for Manganese Removal from Aqueous Solution ». Dans Proceedings of the 6th International Conference on Fundamental and Applied Sciences, 15–25. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4513-6_2.

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Blesic, Marijana, Kenneth R. Seddon, Natalia V. Plechkova, Nimal Gunaratne, António Lopes et Luís Paulo N. Rebelo. « How Hydrophilic Ionic Liquids Behave in Aqueous Solutions ». Dans Molten Salts and Ionic Liquids, 37–48. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9780470947777.ch3.

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Shi, Kemeng, Christian Marcus Pedersen et Yan Qiao. « Magnetic/Ionic Liquids for the Extraction of Phenolic Compounds from Aqueous Medium ». Dans Encyclopedia of Ionic Liquids, 1–9. Singapore : Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-10-6739-6_97-1.

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Actes de conférences sur le sujet "Aqueous ionic liquid"

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Moon, Hyejin, Praveen Kunchala, Yasith Nanayakkara et Daniel W. Armstrong. « Liquid-Liquid Extraction Based on Digital Microfluidics ». Dans ASME 2009 7th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2009. http://dx.doi.org/10.1115/icnmm2009-82268.

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Liquid-liquid extraction techniques are one of the major tools in chemical engineering, analytical chemistry, and biology, especially in a system where two immiscible liquids have an interface solutes exchange between the two liquid phases along the interface up to a point where the concentration ratios in the two liquids reach their equilibrium values [1]. In this paper, we propose to use room temperature ionic liquid (RTIL) as a second liquid phase for extraction, which forms immiscible interface with aqueous solutions. We demonstrate liquid-liquid extraction with the EWOD digital microfluidic device, two model extraction systems were tested. One is organic dye extracted from RTIL(1-butyl-3-methylimidazolium bis(trifluoromethanesulfonylimide or BMIMNTf2) to water and the other is iodine (I2) extracted from water to BMIMNTf2. Droplets of aqueous solution and BMIMNTf2 solution were generated on chip reservoir then transported for extraction and separated by EWOD actuation successfully.
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Zhou, Bo, Gao-zhang Gou, Shi-juan Xu, Na Wu et Wei Liu. « Extraction of parathion by hydroxyl-functionalized ionic liquid aqueous two-phase system ». Dans 5th International Conference on Information Engineering for Mechanics and Materials. Paris, France : Atlantis Press, 2015. http://dx.doi.org/10.2991/icimm-15.2015.95.

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Wu, Zhibin, Yun Li, Ping Cheng, Zhenbin Lei et Weijia Huang. « Density Functional Theory Study of Adding Ionic Liquid to Aqueous Ammonia System ». Dans 2022 6th International Conference on Universal Village (UV). IEEE, 2022. http://dx.doi.org/10.1109/uv56588.2022.10185493.

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Khan, Saif. « Fireflies-on-a-Chip - Ionic liquid-Aqueous Droplets for Biphasic Chemical Analysis ». Dans 14th Asia Pacific Confederation of Chemical Engineering Congress. Singapore : Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-1445-1_778.

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Kumar, Nirbhay, Kumar Nishant Ranjan Sinha, Md Qaisar Raza, Debabrata Seth et Rishi Raj. « Aqueous Ionic Liquid Solution based Two-phase Thermal Management for Adverse Gravity Applications ». Dans 2019 IEEE 21st Electronics Packaging Technology Conference (EPTC). IEEE, 2019. http://dx.doi.org/10.1109/eptc47984.2019.9026654.

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Sharma, Samriti, Sandarve, Amit K. Sharma et Meena Sharma. « Solvation behaviour of L-leucine in aqueous ionic liquid at different temperatures : Volumetric approach ». Dans 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5033267.

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Kunchala, Praveen, Hyejin Moon, Yasith Nanayakkara et Daniel W. Armstrong. « EWOD Based Liquid-Liquid Extraction and Separation ». Dans ASME 2009 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2009. http://dx.doi.org/10.1115/sbc2009-206690.

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Liquid-liquid extraction techniques are one of the major tools in chemical engineering, analytical chemistry, and biology, especially in a system where two immiscible liquids have an interface solutes exchange between the two liquid phases along the interface up to a point where the concentration ratios in the two liquids reach their equilibrium values [1]. Solutes including nucleic acids and proteins of interests can be extracted from one liquid phase to the other immiscible liquid phase as a preparation step for many analytical processes. There are several advantages in miniaturizing the liquid-liquid extraction methods to on-chip level extraction. Usual advantages of miniaturization are the reduction in the sample size and portability. In addition, transport phenomena is faster in Micro-systems than in ordinary size systems, and therefore, one may expect that liquid-liquid extraction takes less time to achieve in miniaturized devices. It is due to shorter diffusion time in micro scale as well as high surface to volume ratio of Microsystems. Electrowetting on dielectric (EWOD) digital microfluidics is an efficient platform to process droplet based analytical processes [2]. Nanoliter (nL) or smaller volume of aqueous liquid droplets can be generated and transported on a chip by EWOD process. In addition to the high surface to volume ratio, high chemical potential can be expected in droplet based extraction when the droplets are in motion. In this paper, we propose to use room temperature ionic liquid (RTIL) as a second liquid phase for extraction, which forms immiscible interface with aqueous solutions. Properties of RTIL can be tailored by choice of cation, anion and substituents. RTIL has been investigated as replacements for the organic solvents and various “task-specific” ionic liquid are being developed which exhibit many attractive properties such as very low vapor pressure, high thermal stability [3]. We recently published EWOD properties of various RTILs toward microfluidic applications [4]. To demonstrate liquid-liquid micro extraction on chip, we fabricated and tested EWOD digital microfluidic devices. Fig. 1 shows (a) top and (b) cross sectional views of EWOD device. Two model extraction systems were tested. One is organic dye extracted from RTIL (1-butyl-3-methylimidazolium bis(trifluoromethanesulfonylimide or BMIMNTf2) to water and the other is iodine (I2) extracted from water to BMIMNTf2. The later model experiment is demonstrated in Fig. 2. Droplets of aqueous solution and BMIMNTf2 solution were generated on chip reservoir then transported for extraction and separated by EWOD actuation. When an aqueous solution and BMIMNTf2 solution join together, they created an interface, since water and BMIMNTf2 are immiscible. Extraction of I2 was done along the interface. After successful extraction, two immiscible liquid phases were separated by EWOD actuation and formed two separate droplets. From the result shown in Fig 2 (g), it is expected that extraction performance at the interface of moving droplet would be enhanced compared to the stationary droplet, because a moving interface prevent the chemical equilibrium, thus more chemical extraction potential can be provided with a moving interface than at a stationary interface. This demonstration is the first step toward total analysis system. The presented result opens the way to on-chip micro extraction, which will be readily integrated with other sample preparation microfluidic components and detection components. Currently, micro extraction systems for larger molecules such as nucleic acids, proteins and biological cells are being developed for further analytical applications.
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Vunder, Veiko, Andres Punning et Alvo Aabloo. « Back-Relaxation of Carbon-Based Ionic Electroactive Polymer Actuators ». Dans ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-8127.

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Back-relaxation — a phenomenon, where the ionic electro-active polymer actuator in its excited state decays back towards its initial shape — is commonly associated with the aqueous IPMC and explained with leak of water. Regardless of the absence of the fluent liquid, the dry actuators with electrodes made of carbon and ionic liquid as electrolyte, exhibit similar side effect. We show that by means of their long-term transient spatial actuation, moment of force, and back-relaxation, the behavior of the carbon-based actuators is comparable to the water-based IPMC actuators.
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Tsaoulidis, Dimitrios, Natalia Plechkova, Kenneth R. Seddon et Panagiota Angeli. « {UO2}2+ Extraction Using Ionic Liquids in Intensified Extractors ». Dans 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-31268.

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The extraction of dioxouranium(VI) from aqueous nitric acid solutions (3M) into TBP/ionic liquid mixtures (30% v/v), relevant to spent fuel reprocessing, was investigated experimentally in intensified small channel extraction units. The intensified extractor consisted of a “T” shaped inlet and a FEP channel of 0.5 mm internal diameter. Important hydrodynamic characteristics such as, plug length, and plug speed were determined by means of bright field imaging, and were related to the extraction performance of the extraction unit. The amount of dioxouranium(VI) extracted was measured online by using UV-Vis spectroscopy.
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Huaming Yu, Jie Chang, Jia Hu, Juan Fan et Huaming Yu. « A novel method for woody biomass separation with the mixture of aqueous ethanol and ionic liquid ». Dans Environment (ICMREE). IEEE, 2011. http://dx.doi.org/10.1109/icmree.2011.5930873.

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