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https://www.readbyqxmd.com/read/28927003/expanding-the-applicability-of-poly-ionic-liquids-in-solid-phase-microextraction-pyrrolidinium-coatings
#1
David J S Patinha, Liliana C Tomé, Mehmet Isik, David Mecerreyes, Armando J D Silvestre, Isabel M Marrucho
Crosslinked pyrrolidinium-based poly(ionic liquids) (Pyrr-PILs) were synthesized through a fast, simple, and solventless photopolymerization scheme, and tested as solid phase microextraction (SPME) sorbents. A series of Pyrr-PILs bearing three different alkyl side chain lengths with two, eight, and fourteen carbons was prepared, characterized, and homogeneously coated on a steel wire by using a very simple procedure. The resulting coatings showed a high thermal stability, with decomposition temperatures above 350 °C, excellent film stability, and lifetime of over 100 injections...
September 18, 2017: Materials
https://www.readbyqxmd.com/read/28926907/research-on-the-quick-and-efficient-recovery-of-1-allyl-3-methylimidazolium-chloride-after-biomass-pretreatment-with-ionic-liquid-aqueous-alcohol-system
#2
Xiaocong Liang, Yan Fu, Jie Chang
Membrane-based methodology electrodialysis (ED) was employed for the quick and efficient recovery of ionic liquid AmimCl from the aqueous solutions after biomass pretreatment with AmimCl-aqueous methanol/ethanol systems. IL recovery performance was relatively stable as the variation of IL-alcohol systems employed in the pretreatment process. IL recovery ratio (R) of 66%-71%, IL recovery performance of specific energy consumption (Sp) of 429-467g/kwh and IL transport rate (Tr) of 5.3-8.2g/(m(2)min) were obtained by single ED treatment...
August 24, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28926256/conductivity-relaxation-relations-in-nanocomposite-polymer-electrolytes-containing-ionic-liquid
#3
Mansoureh Shojaatalhosseini, Khalid Elamin, Jan Swenson
In this study we have used nonocomposite polymer electrolytes, consisting of poly(ethylene oxide) (PEO), δ-Al2O3 nanoparticles and lithium bis(trifluoromethanesolfonyl)imide (LiTFSI) salt (with 4 wt% δ-Al2O3 and PEO:Li ratios of 16:1 and 8:1), and added different amounts of the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethanesolfonyl)imide (BMITFSI). The aim was to elucidate whether the ionic liquid is able to dissociate the Li-ions from the ether oxygens and thereby decouple the ionic conductivity from the segmental polymer dynamics...
September 19, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28926208/ionic-liquids-solvents-and-sorbents-in-sample-preparation
#4
REVIEW
Kevin D Clark, Miranda N Emaus, Marcelino Varona, Ashley N Bowers, Jared L Anderson
The applications of ionic liquids (ILs) and IL-derived sorbents are rapidly expanding. By careful selection of the cation and anion components, the physicochemical properties of ILs can be altered to meet the requirements of specific applications. Reports of IL solvents possessing high selectivity for specific analytes are numerous and continue to motivate the development of new IL-based sample preparation methods that are faster, more selective, and environmentally benign compared to conventional organic solvents...
September 19, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28926059/br%C3%A3-nsted-acidity-in-deep-eutectic-solvents-and-ionic-liquids
#5
Andrew P Abbott, Sahar S M Alabdullah, Azhar Y M Al-Murshedi, Karl S Ryder
Despite the importance of ionic liquids in a variety of fields, little is understood about the behaviour of protons in these media. The main difficulty arises due to the unknown activity of protons in non-aqueous solvents. This study presents acid dissociation constants for nine organic acids in deep eutectic solvents (DESs) using standard pH indicator solutes. The pKIn value for bromophenol blue was found by titrating the DES with triflic acid. The experimental method was developed to understand the acid-base properties of deep eutectic solvents, and through this study it was found that the organic acids studied were slightly less dissociated in the DES than in water with pKa values between 0...
September 19, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28925690/fiber-alignment-and-liquid-crystal-orientation-of-cellulose-nanocrystals-in-the-electrospun-nanofibrous-mats
#6
Weiguang Song, Dagang Liu, Nana Prempeh, Renjie Song
Sulfate cellulose nanocrystal (CNC) dispersions always present specific self-assembled cholesteric mesophases which is easily affected by the inherent properties of particle size, surface charge and repulsion or affinity interaction, and external field force generated from ionic potential of added electrolytes, magnetic, electric, and/or mechanical shearing or stretching. Aiming at understanding the liquid crystal orientation and fiber alignment under high-voltage electric field, randomly distributed, uniform-aligned, or core-sheath nanofibrous mats involving PVA and charged CNCs were electrospun; and amongst them, specific straight arrayed fine nanofibers wi...
September 19, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28925581/advanced-materials-based-on-polymers-and-ionic-liquids
#7
REVIEW
Yuzo Kitazawa, Kazuhide Ueno, Masayoshi Watanabe
Ionic liquids (ILs) are ambient temperature molten salts, which have attracted considerable attention owing to their unique properties. In this contribution, we review advanced materials composed of ILs and polymers for the basis of a new design protocol to fabricate novel materials. As electrolytes for electrochemical devices, cross-linked polymers containing ILs (ion gels) are endowed with functional properties inherited from ILs and mechanical consistency derived from polymers. To create such materials, micro-phase separation of block copolymers and colloidal arrays in the ILs are utilized...
September 19, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28924624/nano-mechanics-of-ionic-liquids-at-dielectric-and-metallic-interfaces
#8
Léo Garcia, Léa Jacquot, Elisabeth Charlaix, Benjamin Cross
Using a dynamic surface force apparatus, we investigate the nano-mechanics and the nano-rheology of an ionic liquid at dielectric and metallic solid surfaces. On smooth dielectric Pyrex surfaces, we find an ordered interfacial phase extending over less than 3 nm away from the top of the layer, with a compression modulus of 15 MPa extracted from the profile of the oscillatory forces. We discuss the boundary flow of the Newtonian bulk phase on this ordered interfacial layer. On metallic platinum surfaces, our hydrodynamic measurements evidence an interfacial soft solid layer extending up to 20 nm away from the top of the layer...
September 19, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28922914/the-effect-of-boron-clusters-on-the-ignition-reaction-of-hno3-and-dicynanamide-based-ionic-liquids
#9
Michael W Schmidt, Mark S Gordon
Many ionic liquids containing the dicynamide anion (DCA-1, formula N(CN)2-1) exhibit hypergolic ignition when exposed to the common oxidizer nitric acid. However, the ignition delay is often about ten times longer than the desired 5 milliseconds for rocket applications, so that improvements are desired. Experiments in the last decade have suggested both a mechanism for the early reaction steps, and also that additives such as decaborane can reduce the ignition delay. The mechanism for reaction of nitric acid with both DCA-1 and protonated DCAH are considered here, using accurate wave function methods...
September 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28921977/photoinduced-bimolecular-electron-transfer-in-ionic-liquids
#10
Boning Wu, Mark Maroncelli, Edward W Castner
The present work seeks to better understand the role of solute diffusion and solvation dynamics on bimolecular electron transfer in ionic liquids (ILs). Steady-state and time-resolved measurements of the reductive fluorescence quenching of five fluorophores ("F") by six quenchers ("Q"; electron donors) are reported in acetonitrile and two ionic liquids, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide and trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)amide. Data were collected on 66 different F-Q-solvent systems, which span a 2...
September 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28921897/a-combined-experimental-and-theoretical-approaches-to-correlate-the-structure-and-properties-of-n-methylpyrrolidone-based-protic-ionic-liquids
#11
Somenath Panda, Kaushik Kundu, Siva Umapathy, Ramesh Gardas
Correlation of the structure and properties of ionic liquids (ILs) is essential for the development of optimized materials in the fields of gas capture and separation, battery electrolyte, and cellulose dissolution process. In view of this, a detailed vibrational spectroscopic analysis and quantum-chemical calculation were performed to explore the interionic interactions in N-methylpyrrolidone cation and carboxylate anion-based ILs. FTIR and Raman spectroscopy were applied to identify the H-bonding interactions between ion-pair, in which red-shifted vibrational modes were evidenced as a function of anion chain length...
September 17, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28921788/characterization-of-doubly-ionic-hydrogen-bonds-in-protic-ionic-liquids-by-nmr-deuteron-quadrupole-coupling-constants-differences-to-h-bonds-in-amides-peptides-and-proteins
#12
Ralf Ludwig, Alexander E Khudozhitkov, Peter Stange, Benjamin Golub, Dietmar Paschek, Alexander G Stepanov, Daniil I Kolokolov
We present the first deuteron quadrupole coupling constants (DQCC) for selected protic ionic liquids (PILs) measured by solid-state NMR spectroscopy. The experimental data are supported by dispersion-corrected density functional theory (DFT-D3) calculations and molecular dynamics (MD) simulations. The DQCCs of the N-D bond in the triethylammonium cations are the lowest reported for deuterons in PILs indicating strong doubly ionic hydrogen bonds. The NMR coupling parameters are compared to those in amides, peptides, and proteins...
September 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28921712/a-review-of-nmr-methods-used-in-the-study-of-the-structure-and-dynamics-of-ionic-liquids
#13
Raju Nanda, Krishnan Damodaran
Recently, NMR spectroscopy has been emerging out as a powerful tool to study the structure and dynamics of ionic liquids (ILs) and ILs-Li(+) salt mixtures. This mini-review primarily focuses on the applications of various NMR spectroscopic techniques such as self-diffusion measurements, NMR relaxometry, two-dimensional NMR and other novel NMR approaches to study the structure and dynamics of ILs and its mixtures with lithium salts.
September 18, 2017: Magnetic Resonance in Chemistry: MRC
https://www.readbyqxmd.com/read/28920938/partial-breaking-of-the-coulombic-ordering-of-ionic-liquids-confined-in-carbon-nanopores
#14
Ryusuke Futamura, Taku Iiyama, Yuma Takasaki, Yury Gogotsi, Mark J Biggs, Mathieu Salanne, Julie Ségalini, Patrice Simon, Katsumi Kaneko
Ionic liquids are composed of equal quantities of positive and negative ions. In the bulk, electrical neutrality occurs in these liquids due to Coulombic ordering, in which ion shells of alternating charge form around a central ion. Their structure under confinement is far less well understood. This hinders the widespread application of ionic liquids in technological applications. Here we use scattering experiments to resolve the structure of a widely used ionic liquid (EMI-TFSI) when it is confined inside nanoporous carbons...
September 18, 2017: Nature Materials
https://www.readbyqxmd.com/read/28920607/tuning-the-electronic-environment-of-zinc-ions-with-a-ligand-for-dendrite-free-zinc-deposition-in-an-ionic-liquid
#15
Zhen Liu, Guozhu Li, Tong Cui, Abhishek Lahiri, Andriy Borodin, Frank Endres
In this work, we report on the influence of an organic ligand on the electrodeposition of Zn from an ionic liquid (IL) electrolyte. Zinc oxide was first dissolved in a protic IL. By introducing a 2-methylimidazole (2-MIm) ligand, the electronic environment of zinc ions, Zn(ii) complexes and the structure of the IL are considerably altered, as verified by both X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. Due to the electron donation effect of the ligand, the zinc ions become less positively charged and exhibit a lower binding energy by -0...
September 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28920460/in-situ-biobutanol-recovery-from-clostridial-fermentations-a-critical-review
#16
Pablo Jiménez-Bonilla, Yi Wang
Butanol is a precursor of many industrial chemicals, and a fuel that is more energetic, safer and easier to handle than ethanol. Fermentative biobutanol can be produced using renewable carbon sources such as agro-industrial residues and lignocellulosic biomass. Solventogenic clostridia are known as the most preeminent biobutanol producers. However, until now, solvent production through the fermentative routes is still not economically competitive compared to the petrochemical approaches, because the butanol is toxic to their own producer bacteria, and thus, the production capability is limited by the butanol tolerance of producing cells...
September 18, 2017: Critical Reviews in Biotechnology
https://www.readbyqxmd.com/read/28920423/self-organization-of-ions-at-the-interface-between-graphene-and-ionic-liquid-deme-tfsi
#17
Guangliang Hu, Gaind P Pandey, Qingfeng Liu, Radhika S Anaredy, Chunrui Ma, Ming Liu, Jun Li, Scott K Shaw, Judy Z Wu
Electrochemical effects manifest as nonlinear responses to an applied electric field in electrochemical devices, and are linked intimately to the molecular orientation of ions in the electric double layer (EDL). Herein, we probe the origin of the electrochemical effect using a double-gate graphene field effect transistor (GFET) of ionic liquid N,N-diethyl-N-(2-methoxyethyl)-N-methylammonium bis-(trifluoromethylsulfonyl)-imide (DEME-TFSI) top-gate, paired with a ferroelectric Pb0.92La0.08Zr0.52Ti0.48O3 (PLZT) back-gate of compatible gating efficiency...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28917807/simultaneous-determination-of-designer-benzodiazepines-in-human-serum-using-non-aqueous-capillary-electrophoresis-tandem-mass-spectrometry-with-successive-multiple-ionic-polymer-layer-coated-capillary
#18
Martin Švidrnoch, Barbora Boráňová, Jana Tomková, Peter Ondra, Vítězslav Maier
A novel non-aqueous capillary electrophoresis - tandem mass spectrometry method for the simultaneous separation, identification and quantification of nine designer benzodiazepines (bentazepam, etizolam, deschloroetizolam, diclazepam, flubromazepam, flubromazolam, nimetazepam, phenazepam, and pyrazolam) was developed. A non-aqueous running electrolyte consisting of 25mM ammonium acetate with 100mM trifluoroacetic acid in acetonitrile was used. The separation was carried out using a semipermanent coated capillary (successive multiple ionic-polymer coating) with a strong anodic electroosmotic flow at a negative separation voltage within twelve minutes...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917749/trace-determination-of-volatile-polycyclic-aromatic-hydrocarbons-in-natural-waters-by-magnetic-ionic-liquid-based-stir-bar-dispersive-liquid-microextraction
#19
Juan L Benedé, Jared L Anderson, Alberto Chisvert
In this work, a novel hybrid approach called stir bar dispersive liquid microextraction (SBDLME) that combines the advantages of stir bar sorptive extraction (SBSE) and dispersive liquid-liquid microextraction (DLLME) has been employed for the accurate and sensitive determination of ten polycyclic aromatic hydrocarbons (PAHs) in natural water samples. The extraction is carried out using a neodymium stir bar magnetically coated with a magnetic ionic liquid (MIL) as extraction device, in such a way that the MIL is dispersed into the solution at high stirring rates...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28916744/hydrogen-sulphate-based-ionic-liquid-assisted-electro-polymerization-of-pedot-catalyst-material-for-high-efficiency-photoelectrochemical-solar-cells
#20
Buket Bezgin Carbas, Mahir Gulen, Merve Celik Tolu, Savas Sonmezoglu
This work reports the facile, one-step electro-polymerization synthesis of poly (3,4-ethylenedioxythiophene) (PEDOT) using a 1-ethyl-3-methylimidazolium hydrogen sulphate (EMIMHSO4) ionic liquid (IL) and, for the first time its utilization as a counter electrode (CE) in dye-sensitized solar cells (DSSCs). Using the IL doped PEDOT as CE, we effectively improve the solar cell efficiency to as high as 8.52%, the highest efficiency reported in 150 mC/cm(2) charge capacity, an improvement of ~52% over the control device using the bare PEDOT CE (5...
September 15, 2017: Scientific Reports
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