Read by QxMD icon Read

ionic liquids

Yaqing Duan, Auriane Freyburger, Werner Kunz, Cordt Zollfrank
We report on a method for the preparation of cellulose/chitin composite materials from the ionic liquid 1-butyl-3-methylimidazolium acetate and γ-valerolactone as a biosourced sustainable co-solvent. Element analysis and attentuated total reflectance Fourier transform infrared spectroscopy show that the average degree of acetylation of chitin in the composite materials was around 82.5%. This indicates that chitin is not deacetylated to chitosan during the dissolution process. The X-ray diffraction results show that the degree of crystallinity of the composite materials increases from amorphous to 59% with increasing chitin concentration accompanied by a developing crystallite size up to 3 nm...
July 15, 2018: Carbohydrate Polymers
Alexey Kossenko, Svetlana Lugovskoy, Moshe Averbukh
Electroconductive carbon felt (CF) material, having a permeable structure and significant electroconductive surface, is widely used for electrodes in numerous electrochemical applications such as redox flow batteries, fuel cells, electrochemical desalination apparatus, etc. The internal structure of CF is composed of different lengths of carbon filaments bonded together. This structure creates a large number of stochastically oriented and stochastically linked channels that have different lengths and cross sections...
April 23, 2018: Materials
Abdul Rahim Ferhan, Joshua A Jackman, Tun Naw Sut, Nam-Joon Cho
Nanoplasmonic sensors are a popular, surface-sensitive measurement tool to investigate biomacromolecular interactions at solid-liquid interfaces, opening the door to a wide range of applications. In addition to high surface sensitivity, nanoplasmonic sensors have versatile surface chemistry options as plasmonic metal nanoparticles can be coated with thin dielectric layers. Within this scope, nanoplasmonic sensors have demonstrated promise for tracking protein adsorption and substrate-induced conformational changes on oxide film-coated arrays, although existing studies have been limited to single substrates...
April 22, 2018: Sensors
Nan-Nan Shen, Min-Lan Cai, Ying Song, Ze-Ping Wang, Fu-Quan Huang, Jian-Rong Li, Xiao-Ying Huang
A series of hybrid tellurium chlorides based on ionic liquids (ILs), namely, α-[Bmim]2 TeCl6 (1, Bmim = 1-butyl-3-methyl imidazolium), β-[Bmim]2 TeCl6 (2), [HOOCMim]2 TeCl6 (3, HOOCMim = 1-carboxymethyl-3-methyl imidazolium), [Bzmim]2 TeCl6 (4, Bzmim = 1-benzyl-3-methyl imidazolium), [EPy]2 TeCl6 (5, EPy = 1-ethylpyridinium), [Bmmim]2 TeCl6 (6, Bmmim = 1-butyl-2,3-dimethyl imidazolium), have been synthesized and characterized. Different kinds of supramolecular networks have been obtained via self-assemblies of isolated [TeCl6 ]2- anions and various ionic liquid cations...
April 24, 2018: Inorganic Chemistry
Yoshiro Yasaka, Yuma Saito, Yoshifumi Kimura
The mechanism of CO2 absorption by a formate ionic liquid, [P4444 ]HCOO, was studied by Raman spectroscopy. The band area for the symmetric CO2 stretching of the formate anion linearly decreases with the CO2 loading. From the slope of the decrease, 1 : 1 stoichiometry is proven between CO2 and the formate anion. The result favors the mechanism we proposed in a preceding work [J. Chem. Eng. Data 61, 837 (2016)]: HCOO- +CO2 +H2 O→HCOOH+HCO3 - →[HCOOH…HCO3 - ]. Further support for the mechanism is obtained by the observation of antisymmetric vibration of CO for the proposed hydrogen-bonded complex between HCOOH and HCO3 - ...
April 24, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Quintin R Sheridan, William F Schneider, Edward J Maginn
Ionic liquids (ILs) have gained considerable attention in recent years as CO2 -reactive solvents that could be used to improve the economic efficiency of industrial-scale CO2 separations. Researchers have demonstrated that IL physical and chemical properties can be optimized for a given application through chemical functionalization of both cations and anions. The tunability of ILs presents both a great potential and a significant challenge due to the complex chemistries and the many ways in which ILs can be made to react with CO2 ...
April 24, 2018: Chemical Reviews
Lorenzo Gontrani
The structure of choline-amino acid ionic liquids, atoxic task-specific solvents composed of materials originated from renewable feedstocks, is reviewed in this letter. The varied and strong interactions that these liquids are capable of establishing are largely dependent on their structure and confer them outstanding solvating properties with respect to a large number of different solutes. Among the experimental methods capable of yielding structural insight, the energy-dispersive version of X-Ray diffraction, that uses the Bremsstrahlung radiation of the X-Ray tube, is a technique very well suited to investigate these liquid systems...
April 23, 2018: Biophysical Reviews
Hisae Tateishi-Karimata, Naoki Sugimoto
Nucleic acids have emerged as powerful biological and nanotechnological tools. In biological and nanotechnological experiments, methods of extracting and purifying nucleic acids from various types of cells and their storage are critical for obtaining reproducible experimental results. In nanotechnological experiments, methods for regulating the conformational polymorphism of nucleic acids and increasing sequence selectivity for base pairing of nucleic acids are important for developing nucleic acid-based nanomaterials...
April 23, 2018: Biophysical Reviews
Veronika Zeindlhofer, Christian Schröder
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...
April 23, 2018: Biophysical Reviews
Norbert S Chilingarov, Maksim S Zhirov, Anna M Shmykova, Ekaterina A Martynova, Lev M Glukhov, Elena A Chernikova, Leonid M Kustov, Vitaliy Yu Markov, Vitaliy A Ioutsi, Lev Nikolaevich Sidorov
The evaporation of dicationic ionic liquid, 1,3-bis(3-methylimidazolium-1-yl)propane bis(trifluoromethanesulfonyl)amide ([C3 (MIm)22+ ][Tf2 N- ]2 ), was studied by Knudsen effusion mass spectrometry. Its evaporation is accompanied by a partial thermal decomposition producing monocationic ionic liquids, 1,3-dimethylimidazolium and 1-(2-propenyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)amides, as volatile products. This decomposition does not affect the vaporization characteristics of [C3 (MIm)2 2+ ][Tf2 N- ]2 , which were established to be as follows...
April 23, 2018: Journal of Physical Chemistry. A
Hiroshi Abe, Nozomu Hamaya, Yoshihiro Koyama, Hiroaki Kishimura, Takahiro Takekiyo, Yukihiro Yoshimura, Daisuke Wakabayashi, Nobumasa Funamori, Kiyoto Matsuishi
The Bragg reflections of 1-decyl-3-methylimidazolium chloride ([C10 mim][Cl]), a room-temperature ionic liquid, are observed in a lowly scattered wavevector (q) region using high-pressure (HP) small-angle X-ray scattering methods. The HP crystal of [C10 mim][Cl] was characterized by an extremely long periodic structure. The peak position at the lowest q (1.4 nm-1 ) was different from that of the prepeak observed in the liquid state (2.3 nm-1 ). Simultaneously, Bragg reflections at high-q were detected using HP wide-angle X-ray scattering...
April 23, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Mei-E Yue, Qiaoyan Lin, Jie Xu, Ting-Fu Jiang
An ionic liquid-based headspace in-tube liquid-phase microextraction (IL-HS-ITLPME) in-line coupled with capillary electrophoresis (CE) is proposed. The method is capable of quantifying trace amounts of phenols in environmental water samples. In the newly developed method, simply by placing a capillary injected with IL in the HS above the aqueous sample, volatile phenols were extracted into the IL acceptor phase in the capillary. After extraction, electrophoresis of the phenols in the capillary was carried out...
April 23, 2018: Electrophoresis
Rebecca R Hawker, Ronald S Haines, Jason B Harper
A variety of ionic liquids, each containing the same cation but a different anion, were examined as solvents for a nucleophilic aromatic substitution reaction. Varying the proportion of ionic liquid was found to increase the rate constant as the mole fraction of ionic liquid increased demonstrating that the reaction outcome could be controlled through varying the ionic liquid. The solvent effects were correlated with the hydrogen bond accepting ability (β) of the ionic liquid anion allowing for qualitative prediction of the effect of changing this component of the solute...
April 23, 2018: Organic & Biomolecular Chemistry
Cosima Damiana Calvano, Antonio Monopoli, Tommaso R I Cataldi, Francesco Palmisano
Since its introduction in the 1980s, matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS) has gained a prominent role in the analysis of high molecular weight biomolecules such as proteins, peptides, oligonucleotides, and polysaccharides. Its application to low molecular weight compounds has remained for long time challenging due to the spectral interferences produced by conventional organic matrices in the low m/z window. To overcome this problem, specific sample preparation such as analyte/matrix derivatization, addition of dopants, or sophisticated deposition technique especially useful for imaging experiments, have been proposed...
April 23, 2018: Analytical and Bioanalytical Chemistry
Lenin D Sarabia, Berin A Boughton, Thusitha Rupasinghe, Allison M L van de Meene, Damien L Callahan, Camilla B Hill, Ute Roessner
Introduction: Mass spectrometry imaging (MSI) is a technology that enables the visualization of the spatial distribution of hundreds to thousands of metabolites in the same tissue section simultaneously. Roots are below-ground plant organs that anchor plants to the soil, take up water and nutrients, and sense and respond to external stresses. Physiological responses to salinity are multifaceted and have predominantly been studied using whole plant tissues that cannot resolve plant salinity responses spatially...
2018: Metabolomics: Official Journal of the Metabolomic Society
Emmanuel Varona-Torres, Doug D Carlton, Zacariah L Hildenbrand, Kevin A Schug
Concerns about the environmental impact of shale energy exploration (i.e., hydraulic fracturing and other well stimulation techniques) have risen due to its rapid expansion in the United States and other countries. Soils in shale basins engaged in unconventional oil and gas development can become contaminated by volatile organic compounds (VOCs), such as benzene, toluene, ethylbenzene, and xylenes (BTEX) through mishandling of chemical additives, products, and/or waste fluids. In this study, room temperature ionic liquids (RTILs) were evaluated as solvents in an effort to increase sensitivity and to reduce and normalize matrix effects associated with varying soil compositions during analysis...
August 27, 2018: Analytica Chimica Acta
Anu Kadyan, Siddharth Pandey
Salt-added ionic liquid media have emerged as versatile alternative to the conventional electrolytes in several applications. Lithium bis(trifluoromethylsulfonyl)imide (LiTf2N)-added ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([emim][Tf2N]) system up to LiTf2N mole fraction (x_(LiTf_2 N)) of 0.40 is investigated using fluorophore-quencher pair of pyrene-nitromethane in 298.15 - 358.15 K temperature range. Excited-state intensity decay of pyrene fits best to a single exponential decay function irrespective of the concentration of nitromethane, x_(LiTf_2 N) and the temperature...
April 20, 2018: Journal of Physical Chemistry. B
Du-Hyun Lim, Anupriya K Haridas, Stelbin Peter Figerez, Prasanth Raghavan, Aleksandar Matic, Jou-Hyeon Ahn
A novel tailor-made multilayer composite polymer electrolyte, consisting of two outer layers of electrospun polyacrylonitrile (PAN) and one inner layer of poly(vinyl acetate) (PVAc)/poly(methyl methacrylate) (PMMA)/poly(ethylene oxide) (PEO) fibrous membrane, was prepared using continuous electrospinning. These membranes, which are made up of fibers with diameters in the nanometer range, were stacked in layers to produce interconnected pores that result in a high porosity. Gel polymer electrolytes (GPEs) were prepared by entrapping a liquid electrolyte (1 M LiPF6 in ethylene carbonate/dimethyl carbonate) in the membranes...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Ya-Qian Xu, Shu-Shen Liu, Ye Fan, Kai Li
It has been stated by researchers that the antibiotic polymyxin B sulfate (POL) is a key component inducing time-dependent antagonism in freshwater luminescent bacteria, Vibrio qinghaiensis sp.-Q67, exposed in the ternary mixture system of the ionic liquids, pesticide and antibiotics. However, the previous statement is limited to ternary and quaternary mixtures without considering situations such as the binary system. In order to prove the direct inducing of antagonism by POL in a more complete and systematic way, two categories of experiments (adding POL in non-antagonistic ternary system and decomposing antagonistic ternary system with POL into the binary system) have been conducted in this paper...
April 17, 2018: Science of the Total Environment
Edvaldo V Soares Maciel, Ana Lúcia de Toffoli, Fernando Mauro Lanças
The accelerated rising of the world's population increased the consumption of food, thus demanding more rigors in the control of residue and contaminants in food-based products marketed for human consumption. In view of the complexity of most food matrices, including fruits, vegetables, different types of meat, beverages, among others, a sample preparation step is important to provide more reliable results when combined with high performance liquid chromatography separations. An adequate sample preparation step before the chromatographic analysis is mandatory in obtaining higher precision and accuracy in order to improve the extraction of the target analytes, one of the priorities in analytical chemistry...
April 20, 2018: Electrophoresis
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"