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ionic liquids

Tirath Raj, Ruchi Gaur, Bhawna Yadav Lamba, Nitu Singh, Ravi P Gupta, Ravindra Kumar, Suresh K Puri, S S V Ramakumar
An insight into the properties of cell wall of mustard stalk (MS) pretreated by five ionic liquids (ILs) revealed ILs interaction with cellulose, hemicellulose and lignin components. Differential Scanning Calorimetry (DSC) showed increased pore size coupled with increased population of pores evoked by certain ILs in better facilitating enzymatic accessibility. Interestingly, all the five ILs predominantly increased the propensity of two pore sizes formation; 19 and 198 nm, but remarkable difference in the pore volumes of pretreated MS suggested the supremacy of [OAc](-) based ILs, resulting in higher glucose yields...
October 4, 2017: Bioresource Technology
Yoon Hwa, Hyeon Kook Seo, Jong Min Yuk, Elton J Cairns
The ambient-temperature rechargeable lithium/sulfur (Li/S) cell is a strong candidate for the beyond lithium ion cell, since significant progress on developing advanced sulfur electrodes with high sulfur loading has been made. Here we report on a new sulfur electrode active material consisting of a cetyltrimethylammonium bromide-modified sulfur-graphene oxide-carbon nanotube (S-GO-CTA-CNT) nano-composite prepared by freeze drying. We show the real-time formation of nano-crystalline lithium sulfide (Li2S) at the interface between the S-GO-CTA-CNT nano-composite and the liquid electrolyte by in situ TEM observation of the reaction...
October 16, 2017: Nano Letters
Jessica Meijide, Marta Pazos, Maria Ángeles Sanromán
The application of the electro-Fenton process for organic compound mineralisation has been widely reported over the past years. However, operational problems related to the use of soluble iron salt as a homogeneous catalyst involve the development of novel catalysts that are able to operate in a wide pH range. For this purpose, polyvinyl alcohol-alginate beads, containing goethite as iron, were synthesised and evaluated as heterogeneous electro-Fenton catalyst for 1-butylpyridinium chloride mineralisation. The influence of catalyst dosage and pH solution on ionic liquid degradation was analysed, achieving almost total oxidation after 60 min under optimal conditions (2 g/L catalyst concentration and pH 3)...
October 15, 2017: Environmental Science and Pollution Research International
Carmen M Domínguez, Macarena Munoz, Asunción Quintanilla, Zahara M de Pedro, Jose A Casas
In the last few years, several works dealing with Fenton oxidation of ionic liquids (ILs) have proved the capability of this technology for their degradation, achieving complete ILs removal and non-toxic effluents. Nevertheless, very little is known about the kinetics of this process, crucial for its potential application. In this work, the effect of several operating conditions, including reaction temperature (50-90 °C), catalyst load (10-50 mg L(-1) Fe(3+)), initial IL concentration (100-2000 mg L(-1)), and hydrogen peroxide dose (10-200% of the stoichiometric amount for the complete IL mineralization) on 1-butyl-3-methylimidazolium chloride ([C4mim]Cl) oxidation has been investigated...
October 15, 2017: Environmental Science and Pollution Research International
Douglas R MacFarlane, Alison L Chong, Maria Forsyth, Mega Kar, R Vijayaraghavan, Anthony Somers, Jennifer M Pringle
In the field of ionic liquids (ILs) it has long been of fundamental interest to examine the transition from salt-in-solvent behaviour to pure liquid-salt behaviour, in terms of structures and properties. At the same time, a variety of applications have beneficially employed IL-solvent mixtures as media that offer an optimal set of properties. Their properties in many cases can be other than as expected on the basis of simple mixing concepts. Instead, they can reflect the distinct structural and interaction changes that occur as the mixture passes through the various stages from pure coulombic medium, to "plasticised" coulombic medium, into a meso-region where distinct molecular and ionic domains can co-exist...
October 16, 2017: Faraday Discussions
Cheng Liu, Yingmin Liao, Xiaojia Huang
This work prepared a new poly (ionic liquid)-functionalized magnetic adsorbent (PFMA) for the extraction of triazole fungicides (TFs) in environmental waters prior to determination by high performance liquid chromatography/diode array detection (HPLC-DAD). A polymerizable ionic liquid, 1-methyl-3-allylimidazolium bis(trifluoromethylsulfonyl)imide was employed to copolymerize with divinylbenzene on the surface of modified magnetite to fabricate the PFMA. The morphology, spectroscopic and magnetic properties of the new adsorbent were investigated by different techniques...
September 28, 2017: Journal of Chromatography. A
Mark P Heitz, Jason W Rupp
The inhibition effects of imidazolium ionic liquids (ILs) on the enzyme kinetics of mushroom tyrosinase is reported. A simple UV-VIS spectrophotometric assay was used to measure the reaction kinetics of the reaction between mushroom tyrosinase and L-dopa. Seven different imidazolium ILs, comprised of 1-alkyl-3-methylimidazolium ([Imn1(+)], n=2, 4, 6) cations paired with several anions that included Cl(-), [NO3(-)], methanesulfonate ([MeSO3(-)]), trifluoromethanesulfonate (or triflate, [TFMS(-)]), and bis(trifluoromethylsulfonyl)imide ([Tf2N(-)])...
October 12, 2017: International Journal of Biological Macromolecules
Manvir Kaur, Gurbir Singh, Sandeep Kumar, Navnidhi, Tejwant Singh Kang
Ionic liquid (IL), 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, [C2mim] [Tf2N], as a non-polar phase in conjunction with polar ethylene glycol (EG) forms microemulsions stabilized by surface active ionic liquids (SAILs), N-methyl-N-alkylimidazolium chlorides, [Cnmim] [Cl], where n = 8, 12 and 16 in conjunction with decanol as co-surfactant. The phase behaviour of the ternary systems has been investigated and three regions of microemulsions - polar-in-ionic liquid, bicontinuous and ionic liquid-in-polar, have been identified using electrical conductivity measurements...
October 7, 2017: Journal of Colloid and Interface Science
Yaqi Xu, Jun Wang, Lusheng Zhu, Zhongkun Du, Jinhua Wang, Kai Wei
Ionic liquids (ILs) are considered environmentally friendly solvents and are widely applied in various fields; however, some researchers have noted the toxicity of ILs to plants cultivated in nutrient solution. To evaluate the toxicities of ILs to wheat seedlings in soil, the natural growth environment of plants, a study was performed using three imidazolium-based ionic liquids with different anions: 1-octyl-3-methylimidazolium chloride ([C8mim]Cl), 1-octyl-3-methylimidazolium bromide ([C8mim]Br) and 1-octyl-3-methylimidazolium tetrafluoroborate ([C8mim]BF4)...
September 25, 2017: Chemosphere
Ayesha Sadaf, Arti Kumari, S K Khare
Present work reports the inhibition of Bacillus cereus EMB20 β-lactamase by a deep eutectic solvent, maline in an uncompetitive manner. Far-UV CD and intrinsic fluorescence spectroscopy revealed a disrupted secondary as well as tertiary structure as a function of maline concentration. The effect of individual components of maline on β-lactamase inhibition showed that malonic acid was mainly responsible for inhibiting the β-lactamase. Structural and docking studies found that malonic acid led to major perturbations in the secondary and tertiary structure of the enzyme while H-bonding with the active site residues...
October 10, 2017: International Journal of Biological Macromolecules
Nicole Lenca, Colin F Poole
The solvation parameter model is used to prepare a system map for the retention of volatile organic compounds on the ionic liquid stationary phase 1,12-di(tripropylphosphonium)dodecane bis(trifluoromethylsulfonyl)imide (SLB-IL60) by gas chromatography over the temperature range 80-280°C. Retention is governed by dispersion, dipole-type and hydrogen-bonding interactions with a different temperature dependence. The hydrogen-bond acidity of the SLB-IL60 column is unexpected since the stationary phase contains no hydrogen-bond acid groups and is not obviously connected to contributions from the deactivated column wall...
October 7, 2017: Journal of Chromatography. A
Zhangtao Li, Lu Wang, Jun Meng, Xingmei Liu, Jianming Xu, Fan Wang, Philip Brookes
Nanoscale zero-valent iron (NZVI) has a high adsorption capacity for heavy metals, but it forms aggregates easily. In this study, zeolite-supported nanoscale zero-valent iron (Z-NZVI) was synthesized from a simplified liquid-phase reduction of iron(III) salts which simultaneously adsorbed As(III), Cd(II) and Pb(II) from aqueous solution and soil. Scanning electron micrographs showed that aggregation was eliminated and the NZVI evenly dispersed onto the surface of zeolite. FTIR spectra reveal that NZVI was protected from oxidization on the surface of Z-NZVI...
September 22, 2017: Journal of Hazardous Materials
Aurélien Perera
Aqueous mixtures of small molecules, such as lower n-alkanols for example, are known to be micro-segregated, with domains in the nano-meter range. One consequence of this micro-segregation would be the existence of long range domain-domain oscillatory correlations in the various atom-atom pair correlation functions, and subsequent pre-peaks in the corresponding atom-atom structure factors, in the q-vector range corresponding to nano-sized domains. However, no such pre-peak have ever been observed in the large corpus of radiation scattering data published so far on aqueous mixtures of small n-alkanols...
October 13, 2017: Physical Chemistry Chemical Physics: PCCP
Bing-Jian Yao, Luo-Gang Ding, Fei Li, Jiang-Tao Li, Qi-Juan Fu, Yujie Ban, Ang Guo, Yu-Bin Dong
CO2 capture and transformation are of great importance to make cuts in greenhouse gas emissions. Nano metal-organic frameworks (NMOFs) could serve as the ideal fillers for polymer-membranes owing to their structural diversity and regulable micro-environment of the nanocage. Herein, a bifunctional robust and chemically cross-linked NMOF-based membrane was successfully constructed by the post-synthetic polymerization of imidazolium-based ionic liquid decorated UiO-66 type nanoparticles (NPs) and isocyanate-terminated polyurethane oligomer under mild condition...
October 13, 2017: ACS Applied Materials & Interfaces
Chae Bin Kim, Ki-Beom Jeong, Beom Joo Yang, Jong-Won Song, Bon Cheol Ku, Seunghyun Lee, Seung Ki Lee, Chiyoung Park
We herein report a facile, cost-competitive, and scalable method for producing viscoelastic conductors via one-pot melt-blending using polymers and supramolecular gels composed of carbon nanotubes (CNTs), diphenylamine (DP), and benzophenone (BP). When mixed, a non-volatile eutectic liquid (EL) produced by simply blending DP with BP (1:1 molar ratio) enabled not only the gelation of CNTs (EL-CNTs) but also the dissolution of a number of commodity polymers. In order to take these advantages, viscoelastic conductors were produced via one-pot melt-blending the EL and CNTs with a model thermoplastic elastomer, poly(styrene-b-butadiene-b-styrene) (SBS, styrene 30 wt%)...
October 10, 2017: Angewandte Chemie
Xiang-Kui Ren, Lin Lu, Rui Liu, Xu-Qiang Jiang, Lai-Yao Geng, Jun-Feng Zheng, Yakai Feng, Er-Qiang Chen
A novel tetraphenylethylene complex (ETTC-DOAB) with enhanced solid-state emission was designed and synthesized via ionic self-assembly (ISA) strategy. The aggregation-induced emission property, phase behavior, and supramolecular structure of the complex were characterized by a combination of variety experimental measurements. The experimental results reveal that the ISA complex could self-assemble into ordered helical supramolecular structure with enhanced luminescent property though the ETTC cores possess large conjugation and high rigidity...
October 10, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Paola Astolfi, Elisabetta Giorgini, Valentina Gambini, Barbara Rossi, Lisa Vaccari, Francesco Vita, Oriano Francescangeli, Cristina Marchini, Michela Pisani
Lyotropic cubic liquid crystalline systems have received increasing attention due to their unique microstructural and physicochemical properties as efficient nanocarriers for drug delivery. In this study we report the preparation and characterization of bulk phases and cubosome dispersions of phytantriol loaded with the anticancer drug 5-fluorouracil, in neutral and anionic forms. In both cases, a Pn3m cubic phase was observed. The phytantriol phase behavior can be influenced by the addition of ionic agents and to this purpose a positively charged lipid, such as N-[1-(2,3-dioleoyloxy)propyl]-N,N,N-trimethylammonium chloride salt (DOTAP), was included in the studied formulations...
October 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Mengmeng Dong, Jun Gao, Chengbu Liu, Dongju Zhang
To illustrate the formation mechanism of normal and abnormal N-heterocyclic carbene-carbon dioxide adducts (NHC-CO2 and aNHC-CO2), we implement DFT calculations on the reactions of two imidazolium-based ionic liquids ([C2C1Im][OAc] and [C2C1Im][CH3SO3]) with CO2. The reaction of [C2C1Im][OAc] with CO2 is mimicked using the gas phase model, implicit solvent model, and combined explicit-implicit solvent model. In gas phase, the calculated barrier at 125℃ and 10 MPa is 12.1 kcal/mol for the formation of NHC-CO2 and 22...
October 12, 2017: Journal of Physical Chemistry. B
S Papović, N Cvjetićanin, Slobodan Gadžurić, M Bešter-Rogač, M Vraneš
Ionic liquid/organic solvent mixtures are investigated as potential optimal electrolytes for lithium-ion batteries (LIBs) that can combine low flammability, good thermal stability and high electrical conductivity. In this work the standard ionic association constants of different 1-alkyl-3-methylimidazolium ([Cnmim](+), n is the number of C in the alkyl side chain - 2, 4, 6 or 8) TFSI(-) based ionic liquids (ILs) in γ-butyrolactone (GBL) are determined using the low concentration Chemical Model (lcCM). Based on the values of for ILs in GBL and earlier physicochemical systematic investigations in that solvent, the system with the lowest was selected for the preparation of the LiTFSI/C2mimTFSI/GBL electrolyte for testing TiO2 nanotube arrays as anode material for LIBs...
October 12, 2017: Physical Chemistry Chemical Physics: PCCP
Joshua E S J Reid, Carlos E S Bernardes, Filipe Agapito, Filomena Martins, Seishi Shimizu, Manuel E Minas da Piedade, Adam J Walker
The ionic nature of a functionalized protic ionic liquid cannot be rationalized simply through the differences in aqueous proton dissociation constants between the acid precursor and the conjugate acid of the base precursor. The extent of proton transfer, i.e. the equilibrium ionicity, of a tertiary ammonium acetate protic ionic liquid can be significantly increased by introducing an hydroxyl functional group on the cation, compared to the alkyl or amino-functionalized analogues. This increase in apparent ionic nature correlates well with variations in solvent-solute and solvent-solvent interaction parameters, as well as with physicochemical properties such as viscosity...
October 12, 2017: Physical Chemistry Chemical Physics: PCCP
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