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https://www.readbyqxmd.com/read/28107622/newton-output-blocking-force-under-low-voltage-stimulation-for-carbon-nanotube-electroactive-polymer-composite-artificial-muscles
#1
I-Wen Peter Chen, Ming-Chia Yang, Chia-Hui Yang, Yiwen Chen, Dai-Xuan Zhong, Ming-Chun Hsu
This is a study on the development of carbon nanotube-based composite actuators using a new ionic liquid-doped electroactiveionic polymer. For scalable production purposes, a simple hot-pressing method was used. Carbon nanotube/ionic liquid-Nafion/carbon nanotube composite films were fabricated that exhibited a large output blocking force and a stable cycling life with low alternating voltage stimuli in air. Of particular interest and importance, a blocking force of 1.5 N was achieved at an applied voltage of 6 V...
January 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28107004/microviscosity-offered-by-ionic-liquids-and-ionic-liquid-glycol-mixtures-is-probe-dependent
#2
Anu Kadyan, Siddharth Pandey
Interactions present within the solubilizing media constituted of ionic liquids (ILs) govern the outcomes of chemical processes carried out within such media by controlling the behavior of solutes dissolved therein. Fluidity afforded by IL-based media, in this context, not only reveals interactions present within the system, it also helps decide whether the system is suitable for an application. Response of spectroscopic microviscosity probes dissolved in IL and IL-based solvents, in this regard, reveals information on both solute-solvent and solvent-solvent interactions present within the system...
January 20, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28106342/electrochemical-reduction-of-oxygen-in-aprotic-ionic-liquids-containing-metal-cations-na-o2-system-case-study
#3
Eneko Azaceta, Lukas Lutz, Alexis Grimaud, Jose Manuel Vicent-Luna, Said Hamad, Luis Yate, Geman Cabañero, Hans-Jurgen Grande, Juan Antonio Anta, Jean-Marie Tarascon, Ramon Tena-Zaera
Metal-air batteries are intensively studied because of their high theoretical energy storage capability. However, the fundamental science at work dealing with electrodes, electrolytes and reaction products still need to be better understood. In this report, the ionic liquid N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide (PYR14TFSI) is chosen to study the influence of a wide range of metal cations (Mn+) on the electrochemical behavior of oxygen.. We demonstrate the relevance of the Lewis hard-soft acid-base (HSAB) theory to predict satisfactorily the reduction potential of the oxygen reduction in electrolytes containing metal cations...
January 19, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28106340/gas-chromatography-with-mass-spectrometry-for-the-determination-of-phthalates-preconcentrated-by-microextraction-based-on-an-ionic-liquid
#4
Juan Ignacio Cacho, Natalia Campillo, Pilar Viñas, Manuel Hernández-Córdoba
A new procedure is proposed for the analysis of migration test solutions obtained from plastic bottles used in the packaging of edible oils. Ultrasound assisted emulsification microextraction with ionic liquids was applied for the preconcentration of six phthalate esters: dimethyl-, diethyl-, di-n-butyl, n-butylbenzyl, di-2-ethylhexyl and di-n-octylphthalate. The enriched ionic liquid was directly analyzed by gas chromatography and mass spectrometry using direct insert microvial thermal desorption. The different factors affecting the microextraction efficiency, like volume of the extracting phase (30 μL of the ionic liquid) and ultrasounds application time (25 s); and the thermal desorption step, such as desorption temperature and time, and gas flow rate, were studied...
January 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28106335/competition-between-cation-solvent-and-cation-anion-interactions-in-imidazolium-ionic-liquids-with-polar-aprotic-solvents
#5
Bogdan A Marekha, Oleg N Kalugin, Marc Bria, Toshiyuki Takamuku, Slobodan Gadžurić, Abdenacer Idrissi
Subtle interplay between ion solvation and association was analyzed in mixtures of imidazolium-based ionic liquids (ILs) with polar aprotic solvents. Site-specific pattern of cation-solvent and cation-anion interactions was disclosed by means of a careful analysis of the 1H and 13C NMR chemical shift mixture composition dependence. It was established that less polar but more donating γ-butyrolactone is more prone to establish H-bonds with the imidazolium ring hydrogen atoms of IL cations than propylene carbonate, particularly at the H2 site and at high dilutions xIL < 0...
January 20, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28104235/determination-and-quantification-of-cations-in-ionic-liquids-by-capillary-electrophoresis-mass-spectrometry
#6
Marcelina Pyschik, Martin Winter, Sascha Nowak
In this study, a capillary electrophoresis (CE) method hyphenated to a high-resolution mass spectrometer is presented to detect the cations in ionic liquids (ILs) and their decomposition products. The investigated ILs were 1-methyl-1-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR13TFSI), 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR14TFSI) and 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (EMIM TFSI). With this method, it was possible to achieve baseline separation of the decomposition products from the main cations in short migration times...
January 13, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28103664/relaxation-in-a-prototype-ionic-liquid-influence-of-water-on-the-dynamics
#7
David L Price, Oleg Borodin, Miguel A González, Maiko Kofu, Kaoru Shibata, Takeshi Yamada, Osamu Yamamuro, Marie-Louise Saboungi
The influence of water on the relaxation of a prototype ionic liquid (IL) C8mimBF4 is examined in the IL-rich regime combining quasi-elastic neutron scattering (QENS) and molecular dynamics (MD) simulations. The QENS and MD simulations results for relaxation of the IL and the equimolar mixture with water probed by the dynamics of the C8mim hydrogen atoms in the time range of 2 ps - 1 ns are in excellent agreement. The QENS data show that translational relaxation increases by a factor of 7 on addition of water, while rotational relaxation involving multiple processes fitted by a KWW function with low β values is speeded up by a factor of 3 on the timescale of QENS measurements...
January 20, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28103428/aqueous-biphasic-systems-for-the-synthesis-of-formates-via-catalytic-co2-hydrogenation-integrated-reaction-and-catalyst-separation-for-co2-scrubbing-solutions
#8
Martin Scott, Beatriz Blas Molinos, Christian Westhues, Giancarlo Franciò, Walter Leitner
Aqueous biphasic systems were investigated for the production of formate-amine-adducts via metal-catalyzed CO2-hydrogenation. Different hydrophobic organic solvents and ionic liquids could be employed as the stationary phase for cis-Ru(dppm)2Cl2 as prototypical catalyst without any modification or tagging of the complex. The solvent pair methyl-isobutylcarbinol (MIBC) and water led to the most practical and productive system and repetitive use of the catalyst phase was demonstrated achieving high endurance with a total TON 150...
January 19, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28102680/ionicity-of-protic-ionic-liquid-quantitative-measurement-by-spectroscopic-methods
#9
Minming Shen, Yuyang Zhang, Kaizhou Chen, Siying Che, Jia Yao, Haoran Li
The ionicity value, which is a key property of protic ionic liquids, was obtained by the attenuated total reflection Fourier transform infrared spectroscopy and nuclear magnetic resonance respectively for a protic ionic liquid: n-propylammonium acetate. The method of potentiometric titration is found not suitable for such kind of ionic liquid as the ∆pKa of the compositing acid and base is relatively small. In the IR spectrum, molecular species can be directly observed in the range 1200-1800 cm-1, and the ratio of ionic and molecular species can be quantitatively calculated by the area of characteristic absorption peaks calibrated by standard curve from NaAc/HAc solutions...
January 19, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28102400/using-chiral-ionic-liquid-additives-to-enhance-asymmetric-induction-in-a-diels-alder-reaction
#10
P Goodrich, H Q Nimal Gunaratne, L Hall, Y Wang, L Jin, M J Muldoon, A P C Ribeiro, A J L Pombeiro, V I Pârvulescu, P Davey, C Hardacre
A bis-oxazoline ligand has been complexed using Cu(ii) and Zn(ii) trifluoromethanesulfonate and a range of chiral ionic liquid (CIL) additives based on natural products were used as a co-catalyst for a Diels-Alder reaction. The catalytic performance of these systems was compared for the asymmetric Diels-Alder reaction between N-acryloyloxazolidinone and cyclopentadiene with and without the presence of a CIL additive. In the absence of the CIL, both catalysts resulted in low enantioselectivities in conventional solvents and ionic liquids...
January 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28099808/dynamics-in-a-room-temperature-ionic-liquid-from-the-cation-perspective-2d-ir-vibrational-echo-spectroscopy
#11
Steven A Yamada, Heather E Bailey, Amr Tamimi, Chunya Li, Michael D Fayer
The dynamics of the room temperature ionic liquid (RTIL) 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BmimNTf2) were investigated with two dimensional infrared (2D IR) vibrational echo spectroscopy and polarization selective pump-probe (PSPP) experiments. The CN stretch frequency of a modified Bmim+ cation (referred to hereafter as 2-SeCN-Bmim+), in which a SeCN moiety was substituted onto the C-2 position of the imidazolium ring, was used as a vibrational probe. A major result of the 2D IR experiments is the observation of a long timescale structural spectral diffusion component of 600 ps in addition to short and intermediate timescales similar to those measured for selenocyanate anion (SeCN‒) dissolved in BmimNTf2...
January 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28099800/interfacial-structures-of-trihexyltetradecylphosphonium-bis-mandelato-borate-ionic-liquid-confined-between-gold-electrodes
#12
Yonglei Wang, Mikhail Golets, Bin Li, Sten Sarman, Aatto Laaksonen
Atomistic molecular dynamics simulations have been performed to study microscopic interfacial ionic structures, molecular arrangements and orientational preferences of trihexyltetradecylphosphonium-bis(mandelato)borate ($[\textrm{P}_{6,6,6,14}]$[BMB]) ionic liquid confined between neutral and charged gold electrodes. It is found that both $[\textrm{P}_{6,6,6,14}]$ cations and [BMB] anions are coabsorbed onto neutral electrodes at different temperatures. The hexyl and tetradecyl chains in $[\textrm{P}_{6,6,6,14}]$ cations lie preferentially flat on neutral electrodes...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28098280/single-lithium-ion-conducting-solid-polymer-electrolytes-advances-and-perspectives
#13
REVIEW
Heng Zhang, Chunmei Li, Michal Piszcz, Estibaliz Coya, Teofilo Rojo, Lide M Rodriguez-Martinez, Michel Armand, Zhibin Zhou
Electrochemical energy storage is one of the main societal challenges to humankind in this century. The performances of classical Li-ion batteries (LIBs) with non-aqueous liquid electrolytes have made great advances in the past two decades, but the intrinsic instability of liquid electrolytes results in safety issues, and the energy density of the state-of-the-art LIBs cannot satisfy the practical requirement. Therefore, rechargeable lithium metal batteries (LMBs) have been intensively investigated considering the high theoretical capacity of lithium metal and its low negative potential...
January 18, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28097741/-inherently-chiral-ionic-liquid-media-effective-chiral-electroanalysis-on-achiral-electrodes
#14
Simona Rizzo, Serena Arnaboldi, Voichita Mihali, Roberto Cirilli, Alessandra Forni, Armando Gennaro, Abdirisak Ahmed Isse, Marco Pierini, Patrizia Romana Mussini, Francesco Sannicolò
To achieve enantioselective electroanalysis either chiral electrodes or chiral media are needed. High enantiodiscrimination properties can be granted by the "inherent chirality" strategy of developing molecular materials in which the stereogenic element responsible for chirality coincides with the molecular portion responsible for their specific properties, an approach recently yielding outstanding performances as electrode surfaces. Inherently chiral ionic liquids (ICILs) have now been prepared starting from atropisomeric 3,3'-bicollidine, synthesized from inexpensive reagents, resolved into antipodes without need of chiral HPLC and converted into long-chain dialkyl salts with melting points below room temperature...
January 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28097501/efficient-production-of-free-fatty-acids-from-ionic-liquid-based-acid-or-enzyme-catalyzed-bamboo-hydrolysate
#15
Le Mi, Dandan Qin, Jie Cheng, Dan Wang, Sha Li, Xuetuan Wei
Two engineered Escherichia coli strains, DQ101 (MG1655 fadD (-))/pDQTES and DQ101 (MG1655 fadD (-))/pDQTESZ were constructed to investigate the free fatty acid production using ionic liquid-based acid- or enzyme-catalyzed bamboo hydrolysate as carbon source in this study. The plasmid, pDQTES, carrying an acyl-ACP thioesterase 'TesA of E. coli in pTrc99A was constructed firstly, and then (3R)-hydroxyacyl-ACP dehydratase was ligated after the TesA to give the plasmid pDQTESZ. These two strains exhibited efficient fatty acid production when glucose was used as the sole carbon source, with a final concentration of 2...
January 17, 2017: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28096353/high-coulombic-efficiency-aluminum-ion-battery-using-an-alcl3-urea-ionic-liquid-analog-electrolyte
#16
Michael Angell, Chun-Jern Pan, Youmin Rong, Chunze Yuan, Meng-Chang Lin, Bing-Joe Hwang, Hongjie Dai
In recent years, impressive advances in harvesting renewable energy have led to a pressing demand for the complimentary energy storage technology. Here, a high Coulombic efficiency (∼99.7%) Al battery is developed using earth-abundant aluminum as the anode, graphite as the cathode, and a cheap ionic liquid analog electrolyte made from a mixture of AlCl3 and urea in a 1.3:1 molar ratio. The battery displays discharge voltage plateaus around 1.9 and 1.5 V (average discharge = 1.73 V) and yielded a specific cathode capacity of ∼73 mAh g(-1) at a current density of 100 mA g(-1) (∼1...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28094396/nanostructuration-of-ionic-liquids-impact-on-the-cation-mobility-a-multi-scale-study
#17
Filippo Ferdeghini, Quentin Berrod, Jean-Marc Zanotti, Patrick Judeinstein, Victoria García Sakai, Orsolya Czakkel, Peter Fouquet, Doru Constantin
When probed at the macroscopic scale, Ionic Liquids (ILs) behave as highly dissociated (i.e. strong) electrolytes while, at the molecular scale, they show clear characteristics of weak ionic solutions. The multi-scale analysis we report in this paper reconciles these apparently at odds behaviors. We investigate by quasi-elastic neutron scattering (QENS) and neutron spin-echo (NSE), the nanometer/nanosecond dynamics of OMIM-BF4, an imidazolium-based IL showing strong nanostructuration. We also probe the same IL on the microscopic (μm and ms) scale by pulsed field gradient NMR...
January 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28094153/development-and-validation-of-a-fast-ionic-liquid-based-dispersive-liquid-liquid-microextraction-procedure-combined-with-lc-ms-ms-analysis-for-the-quantification-of-benzodiazepines-and-benzodiazepine-like-hypnotics-in-whole-blood
#18
Marieke De Boeck, Sophie Missotten, Wim Dehaen, Jan Tytgat, Eva Cuypers
To date, thorough clean-up of complex biological samples remains an essential part of the analytical process. The solid phase extraction (SPE) technique is the well-known standard, however, its main weaknesses are the labor-intensive and time-consuming protocols. In this respect, dispersive liquid-liquid microextractions (DLLME) seem to offer less complex and more efficient extraction procedures. Furthermore, ionic liquids (ILs) - liquid salts - are emerging as new promising extraction solvents, thanks to their non-flammable nature, negligible vapor pressure and easily adaptable physiochemical properties...
December 26, 2016: Forensic Science International
https://www.readbyqxmd.com/read/28092704/x-ray-reflectivity-study-of-interaction-of-an-imidazolium-based-ionic-liquid-with-soft-supported-lipid-membrane
#19
Gourav Bhattacharya, Rajendra P Giri, Himani Saxena, Ved Varun Agrawal, Ashish Gupta, Mrinmay Kumar Mukhopadhyay, Sajal Kumar Ghosh
Ionic liquids (ILs) are important for their antimicrobial activity and are found to be toxic to some of the micro-organisms. To shed light on the mechanism of their activities, the interaction of an imidazolium-based IL 1-butyl-3-methylimidazolium tetrfluroborate ([BMIM][BF4]) with E-coli bacteria and cell membrane mimicking lipid mono- and bi-layers have been studied. The survival of the bacteria and corresponding growth inhibition are observed to be a function of concentration of the IL. The IL alters the pressure area isotherm of the monolayer formed at air-water interface by the lipid 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC)...
January 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28092134/reversible-formation-of-2d-electron-gas-at-the-lafeo3-srtio3-interface-via-control-of-oxygen-vacancies
#20
Pengfa Xu, Wei Han, Philip M Rice, Jaewoo Jeong, Mahesh G Samant, Katayoon Mohseni, Holger L Meyerheim, Sergey Ostanin, Igor V Maznichenko, Ingrid Mertig, Eberhard K U Gross, Arthur Ernst, Stuart S P Parkin
A conducting 2D electron gas (2DEG) is formed at the interface between epitaxial LaFeO3 layers >3 unit cells thick and the surface of SrTiO3 single crystals. The 2DEG is exquisitely sensitive to cation intermixing and oxygen nonstoichiometry. It is shown that the latter thus allows the controllable formation of the 2DEG via ionic liquid gating, thereby forming a nonvolatile switch.
January 16, 2017: Advanced Materials
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