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ionic liquids

Urszula Maria Domanska, Patrycja Okuniewska, Kamil Paduszyński, Marta Królikowska, Maciej Zawadzki, Mikolaj Wieckowski
This work presents some important issues and topics related to possible extraction of 2-phenylethanol (PEA) from aqueous phase "in situ" during the biosynthesis. It consist of a series of experimental phase equilibrium measurements in binary and ternary systems. Ionic liquids (ILs) are an important new media for imaging and sensing applications because of their solvation property, thermal stability and negligible vapor pressure. However, complex procedures and non-miscibility with water are often required in PEA extraction...
July 19, 2017: Journal of Physical Chemistry. B
Xinglei Tao, Hanyu Jia, Yonglin He, Shenglong Liao, Yapei Wang
With the use of an ionic liquid as the ultrathermosensitive fluid, a paper thermometer is successfully developed with intrinsic ability of ultrafast response and high stability upon temperature change. The fluidic nature allows the ionic liquid to be easily deposited on paper by pen writing or inkjet printing, affording great promise for large-scale fabrication of low-cost paper sensors. Owing to the advantages of nonvolatilization, excellent continuity and deformability, the thermosensitive ink trapped within the cellulose fibers of paper matrix has no leakage or evaporation at open states, ensuring the excellent stability and repeatability of thermal sensing against arbitrary bending and folding operation...
March 24, 2017: ACS Sensors
Sangita Kundu, Chiranjib Banerjee, Nilmoni Sarkar
One of the key necessary steps to prevent human neurological disorders is the efficient disruption of protein aggregation or amyloid fibril. In this article, we have explored the effect of three amphiphilic surface active ionic liquids (SAILs) namely 1-methyl-3-octylimidazolium chloride ([C8mim]Cl), 1-dodecyl-3-methyllimidazolium chloride ([C12mim]Cl) and 1-hexadecyl-3-methyllimidazolium chloride ([C16mim]Cl) having concentration of 5.8 mM, 0.29 mM and 0.08 mM respectively on bovine serum albumin (BSA) and human serum albumin (HSA) fibril...
July 19, 2017: Journal of Physical Chemistry. B
Jae Yoon Shin, Steven A Yamada, Michael D Fayer
Supported ionic liquid membranes (SILMs) are porous membranes impregnated with ionic liquids (ILs) and used as advanced carbon capture materials. Here, two-dimensional infrared (2D IR) and IR polarization selective pump-probe (PSPP) spectroscopies were used to investigate CO2 reorientation and spectral diffusion dynamics in SILMs. The SILM contained 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonly)imide in the poly(ether sulfone) membrane with average pore size of ~350 nm. Two ensembles of CO2 were observed in the SILM, one in the IL phase in the membrane pores and the other in the supporting membrane polymer...
July 19, 2017: Journal of the American Chemical Society
Xinxin Wang, Xingmei Lu, Qing Zhou, Yongsheng Zhao, Xiaoqian Li, Suojiang Zhang
Refractive index is one of the important physical properties, which is widely used in separation and purification. In this study, the refractive index data of ILs were collected to establish a comprehensive database, which included about 2138 pieces of data from 1996 to 2014. The Group Contribution-Artificial Neural Network (GC-ANN) model and Group Contribution (GC) method were employed to predict the refractive index of ILs at different temperatures from 283.15 K to 368.15 K. Average absolute relative deviations (AARD) of the GC-ANN model and the GC method were 0...
July 19, 2017: Physical Chemistry Chemical Physics: PCCP
Joshua E S J Reid, Filipe Agapito, Carlos E S Bernardes, Filomena Martins, Adam J Walker, Seishi Shimizu, Manuel E Minas da Piedade
How does cation functionality influence the strength of intermolecular interactions in protic ionic liquids (PILs)? Quantifying the energetics of PILs can be an invaluable tool to answer this fundamental question. With this in view, we have determined the standard molar enthalpy of vaporization, , and the standard molar enthalpy of formation, , of three tertiary ammonium acetate PILs with varying cation functionality, and of their corresponding precursor amines, through a combination of Calvet-drop microcalorimetry, solution calorimetry, and ab initio calculations...
July 19, 2017: Physical Chemistry Chemical Physics: PCCP
Ryosuke Ishizuka, Nobuyuki Matubayasi
A self-consistent scheme combining the molecular dynamics (MD) simulation and density functional theory (DFT) was recently proposed to incorporate the effects of the charge transfer and polarization of ions into non-poralizable force fields of ionic liquids for improved description of energetics and dynamics. The purpose of the present work is to analyze the detailed setups of the MD/DFT scheme by focusing on how the basis set, exchange-correlation (XC) functional, charge-fitting method or force field for the intramolecular and Lennard-Jones interactions affects the MD/DFT results of 1,3-dimethylimidazolium bis(trifluoromethylsulfonyl) imide ( [C1mim][NTf2]) and 1-ethyl-3-methylimidazolium glycinate ( [C2mim][Gly])...
July 18, 2017: Journal of Computational Chemistry
Lisa Weigand, Shahrokh Mostame, Agnieszka Brandt-Talbot, Tom Welton, Jason P Hallett
The ionoSolv pretreatment is a new technique employing protic low-cost ionic liquids and has previously been applied to successfully fractionate switchgrass and the grass Miscanthus giganteus. This study investigates the effect of using the protic ionic liquid solution [N2220][HSO4]80% with two different acid/base ratios (1.02 and 0.98) at 120, 150 and 170 °C on the pretreatment outcome of the hardwood willow. The ionic liquid solution was able to fractionate willow, and a pulp and lignin fraction were recovered after treatment...
July 18, 2017: Faraday Discussions
Witold Zielinski, Rafal Kukawka, Hieronim Maciejewski, Marcin Smiglak
The authors are sorry to report that the yield of the hydrosilylation reaction in [P44414][NTf2] (1) IL with [RhCl(PPh3)3] was replaced with the yield reported for [P44414][NTf2] (1) IL with K2PtCl4 in their published paper [1]. [...].
July 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Lisa Warner, Erica Gjersing, Shelby E Follett, K Wade Elliott, Sergei V Dzyuba, Krisztina Varga
Ionic liquids have great potential in biological applications and biocatalysis, as some ionic liquids can stabilize proteins and enhance enzyme activity, while others have the opposite effect. However, on the molecular level, probing ionic liquid interactions with proteins, especially in solutions containing high concentration of ionic liquids, has been challenging. In the present work the (13)C, (15)N-enriched GB1 model protein was used to demonstrate applicability of high-resolution magic-angle-spinning (HR-MAS) NMR spectroscopy to investigate ionic liquid - protein interactions...
December 2016: Biochemistry and Biophysics Reports
Mirosław Chorążewski, Eugene B Postnikov, Bernadeta Jasiok, Yuriy V Nedyalkov, Johan Jacquemin
During this work, we demonstrate, for the first time, that the volumetric properties of pure ionic liquids could be truly predicted as a function of temperature from 219 K to 473 K and pressure up to 300 MPa. This has been achieved by using only density and isothermal compressibility data at atmospheric pressure through the Fluctuation Theory-based Tait-like Equation of State (FT-EoS). The experimental density data of 80 different ionic liquids, described in the literature by several research groups as a function of temperature and pressure, was then used to provide comparisons...
July 17, 2017: Scientific Reports
Boris A Noskov, Michael M Krycki
The review discusses the mechanism of formation of protein/surfactant adsorption layers at the liquid - gas interface. The complexes of globular proteins usually preserve their compact structure a low surfactant concentrations. Therefore a simple kinetic model of the adsorption of charged compact nanoparticles is discussed first and compared with experimental data. The increase of surfactant concentrations results in various conformational transitions in the surface layer. One can obtain information on the changes of the adsorption layer structure using the dilational surface rheology...
July 6, 2017: Advances in Colloid and Interface Science
Dawood Elhamifar, Hakimeh Ardeshirfard
A novel phenyl and ionic liquid based bifunctional periodic mesoporous organosilica supported copper (Cu@BPMO-Ph-IL) is prepared, characterized and its catalytic application is developed in the clean production of polyhydroquinolines. The Cu@BPMO-Ph-IL was prepared via chemical grafting of ionic liquid groups onto phenyl-based PMO followed by treatment with copper acetate. This nanocatalyst was characterized with transmission electron microscopy (TEM), scanning electron microscopy (SEM), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs), thermal gravimetric analysis (TGA), powder X-ray diffraction (PXRD), nitrogen-sorption and energy dispersive X-ray (EDX) analyses...
July 3, 2017: Journal of Colloid and Interface Science
A Ehsani, E Kowsari, F Boorboor Ajdari, R Safari, H Mohammad Shiri
In present work, for improving the electrochemical performance of conductive polymer, POAP/3-methyl-1-[2-(2-{2-[2-[(3-methyl-1-H-imidazol-3-ium-1-yl)ethoxy]ethoxy}-ethoxy)ethyl]-1-H-imidazol-3-ium dichloride (MIEID) composite films have been fabricated by poly ortho aminophenol (POAP) electropolymerization in the presence of MIEID as active electrodes for electrochemical supercapacitors. Different electrochemical methods including galvanostatic charge discharge experiments, cyclic voltammetry and electrochemical impedance spectroscopy have been applied to study the system performance...
July 3, 2017: Journal of Colloid and Interface Science
Muhammad Nasir, Sajid Rauf, Nawshad Muhammad, Mian Hasnain Nawaz, Aqif Anwar Chaudhry, Muhammad Hamza Malik, Shakir Ahmad Shahid, Akhtar Hayat
Nanoparticles proved a viable alternative to the already used sensing and diagnostics methods due to their low cost, good stability, easy availability and easy synthesis. In the present approach, nitrogen doped titania nanoparticles are prepared through freeze drying method, and subsequently stabilized through ionic liquid. These nanoparticles were characterized through various techniques such as X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), BET pore size and surface area analyzer, X-ray photoelectron spectroscopy (XPS) and UV-Visible diffuse reflectance spectroscopy (UV-Vis...
July 6, 2017: Journal of Colloid and Interface Science
Tyler Cosby, Zachariah Vicars, Yangyang Wang, Joshua R Sangoro
Experimental access to the lifetimes and dynamics of mesoscopic structures in room temperature ionic liquids - a feature expected to correlate with many physicochemical properties of these materials - remains limited. Here, we report the observation of slow, sub- α relaxations corresponding to dynamics of nanoscale hydrophobic aggregates in a systematic series of 1-alkyl-3-methylimidazolium-based ionic liquids from detailed analysis of dynamic-mechanical and broadband dielectric spectra. The emergence of the sub-α relaxations as determined by the two experimental methods correlates with an increase in alkyl spacer length on the imidazolium cation and results in higher zero-shear viscosity and static dielectric permittivity, constituting direct evidence of the influence of mesoscale aggregation on the physicochemical properties of ionic liquids...
July 17, 2017: Journal of Physical Chemistry Letters
Ranu Satish Dhale, Prabhat Kumar Sahu, Moloy Sarkar
The present study has been undertaken with an aim to find out the suitability of a binary solvent system, comprising an ionic liquid, 1-(2-Hydroxyethyl)-3-methylimidazolium bis (trifluoromethylsulfonyl)imide ([OHEMIM][NTf2]) and ethylene glycol (EG), towards lithium ion battery applications. For this purpose, the behavior in terms of structure, intermolecular interaction and dynamics of several solvent systems, [OHEMIM][NTf2], [OHEMIM][NTf2]-LiNTf2(lithium bis(trifluoromethylsulfonyl)imide), [OHEMIM][NTf2]-EG and [OHEMIM][NTf2]-EG-LiNTf2 are investigated by carrying out steady state and time-resolved fluorescence, nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR) measurements...
July 17, 2017: Journal of Physical Chemistry. B
Li Sun, Hua Zhou, Li Li, Ying Yao, Haonan Qu, Chengli Zhang, Shanhu Liu, Yanmei Zhou
Heteroatom-doped hierarchical porous carbon materials derived from the potential precursors and prepared by a facile, effective and low-pollution strategy have recently been particularly concerned in different research fields. In this study, the interconnected nitrogen/sulfur-codoped hierarchically porous carbon materials have been successfully obtained via one-step carbonization of the self-assembly of [Phne][HSO4] (a protic ionic liquid originated from dilute sulfuric acid and phenothiazine by a straight-forward acid-base neutralization) and the double soft-template of OP-10 and F-127...
July 17, 2017: ACS Applied Materials & Interfaces
Takeshi Kobayashi, Joshua E S J Reid, Seishi Shimizu, Maria Fyta, Jens Smiatek
We study the properties of residual water molecules at different mole fractions in dialkylimidazolium based ionic liquids (ILs), namely 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIM/BF4) and 1-butyl-3-methylimidazolium tetrafluoroborate (BMIM/BF4) by means of atomistic molecular dynamics (MD) simulations. The corresponding Kirkwood-Buff (KB) integrals for the water-ion and ion-ion correlation behavior are calculated by a direct evaluation of the radial distribution functions. The outcomes are compared to the corresponding KB integrals derived by an inverse approach based on experimental data...
July 17, 2017: Physical Chemistry Chemical Physics: PCCP
Hatem M Titi, Steven P Kelley, Max E Easton, Stephen D Emerson, Robin D Rogers
The ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate was utilized as a liquid-state crystallization agent to form ionic co-crystals using amphoteric azoles selected as model compounds for active pharmaceutical ingredients. Weakly acidic azoles crystallize the IL relatively quickly, while stronger acidic azoles undergo slower ion exchange with the IL to form salts.
July 17, 2017: Chemical Communications: Chem Comm
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