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Ionic liquid

Luc Belloni, Daniel Borgis, Maximilien Levesque
The ion-induced long-range orientational order between water molecules recently observed in second harmonic scattering experiments and illustrated with large scale molecular dynamics simulations is quantitatively explained using the Ornstein-Zernike integral equation approach of liquid physics. This general effect, not specific to hydrogen-bonding solvents, is controlled by electroneutrality condition, dipolar interactions and dielectric+ionic screening. As expected, all numerical theories recover the well-known analytical expressions established 40 years ago...
March 15, 2018: Journal of Physical Chemistry Letters
Helena Passos, Teresa B V Dinis, Emanuel V Capela, Maria V Quental, Joana Gomes, Judite Resende, Pedro P Madeira, Mara G Freire, João A P Coutinho
In the past decade, the remarkable potential of ionic-liquid-based aqueous biphasic systems (IL-based ABSs) to extract and purify a large range of valued-added biocompounds has been demonstrated. However, the translation of lab-scale experiments to an industrial scale has been precluded by a poor understanding of the molecular-level mechanisms ruling the separation or partition of target compounds between the coexisting phases. To overcome this limitation, we carried out a systematic evaluation of specific interactions, induced by ILs and several salts used as phase-forming components, and their impact on the partition of several solutes in IL-based ABSs...
March 15, 2018: Physical Chemistry Chemical Physics: PCCP
Yu Hang Li, Ling Cheng, Peng Fei Liu, Le Zhang, Meng Yang Zu, Chong Wu Wang, Yan Huan Jin, Xiao Ming Cao, Huagui Yang, Chunzhong Li
Electrocatalytic reduction of carbon dioxide (CO2) to carbon monoxide (CO) is the first step in carbon-based fuels synthesis and feedstocks using renewable electricity. Although molybdenum or tungsten based compounds can efficiently catalyze this reaction, they generally require the costly ionic liquid as electrolyte, making it essential to find a suitable compound substitute to achieve CO2 reduction with high selectivity in aqueous medium. Here we demonstrate a simple cadmium sulfide as an efficient and stable electrocatalyst for CO2 reduction in aqueous medium for more than 40 hours with a steady CO Faradaic efficiency of ca...
March 14, 2018: ChemSusChem
Jatindranath Maiti, Nitul Kakati, Sung Pil Woo, Young Soo Yoon
This data provides the fuel cell performance of Nafion based hybrid membranes containing GO and dihydrogen phosphate functionalized ionic liquid (IL) at 70 °C under anhydrous condition. Readers are requested to go through the article entitled "Nafion® based hybrid composite membrane containing GO and dihydrogen phosphate functionalized ionic liquid for high temperature polymer electrolyte membrane fuel cell" (Maiti et al., 2017) [1] for further interpretation and discussion.
February 2018: Data in Brief
Eden E L Tanner, Stanislav V Sokolov, Kamonwad Ngamchuea, Robert G Palgrave, Richard G Compton
X-ray Photoelectron Spectroscopy was used to characterise silver nanoparticles capped with poly(ethylene) glycol in a room temperature ionic liquid (RTIL), 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]). The amounts of oxygen and silver present in nanoparticles capped with different molecular weight thiolated PEG chains were monitored, and the number of thiolated PEG chains per nanoparticle was calculated, an in situ characterisation not previously possible.
March 14, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Mahmoud Nasrollahzadeh, Mohaddeseh Sajjadi, Fatemeh Ghorbannezhad, S Mohammad Sajadi
A3 coupling is one of the few transition-metal catalyzed carbon-carbon bond forming reactions that have been established as a most direct, efficient and atom-economical synthetic approach to afford propargylamine derivatives using various catalysts. A large number of nanosized heterogeneous catalysts for three-component coupling reactions between an aldehyde, an amine, and a terminal alkyne have been popularly introduced as an A3 coupling in the last decade. The coupling product has found a broad application as a key intermediate for a variety of heterocyclic useful compounds and numerous biologically active molecules such as β-lactams, conformationally restricted peptides, isosteres, herbicides, fungicides, indolizines, pyrroles, quinolines and therapeutic drug molecules...
March 14, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Maria B Vazquez-Santos, Pedro Tartaj, Enrique Morales, Jose Manuel Amarilla
Here we summarize some results on the use of TiO2 nanostructures as anode materials for more efficient Li-ion (LIBs) and Na-ion (NIBs) batteries. LIBs are the leader to power portable electronic devices, and represent in the short-term the most adequate technology to power electrical vehicles, while NIBs hold promise for large storage of energy generated from renewable sources. Specifically, TiO2 an abundant, low cost, chemically stable and environmentally safe oxide represents in LIBs an alternative to graphite for applications in which safety is mandatory...
March 14, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Oscar Cabeza, Luisa Segade, Montserrat Domínguez-Pérez, Esther Rilo, David Ausín, Anna Martinelli, Negin Yaghini, Bernhard Gollas, Manfred Kriechbaum, Olga Russina, Alessandro Triolo, Elena López-Lago, Luis M Varela
This paper extends the study of the induced temperature change in the mesostructure and in the physical properties occurring in aqueous mixtures of the ionic liquid 1-ethyl-3-methyl imidazolium octyl-sulfate [EMIm][OSO4 ]. For some compositions, these mixtures undergo a phase transition between the liquid (isotropic in the mesoscale) and the mesomorphic state (lyotropic liquid crystalline) at about room temperature. The behavior of mixtures doped with a divalent metal sulfate was investigated in order to observe their applicability as electrolytes...
March 14, 2018: Physical Chemistry Chemical Physics: PCCP
Jesse Gatten McDaniel, Chang Yun Son, Arun Yethiraj
Room temperature ionic liquids composed of organic anions bis(trifluoromethanesulfonyl)imide (TFSI), bis(fluorosulfonyl)imide (FSI), and trifluoromethanesulfonate (OTf) exhibit interesting physical properties and are important for many electrochemical applications. TFSI and FSI form ``hydrophobic'' ionic liquids, immiscible with water but miscible with many organic solvents and polymers; for computer simulation studies, it is thus essential to develop force fields for these anions that are transferable among this wide variety of chemical environments...
March 14, 2018: Journal of Physical Chemistry. B
Badrinath Jagannath, Sriram Muthukumar, Shalini Prasad
We have investigated the role of kosmotropic anionic moieties and chaotropic cationic moieties of room temperature hydrophilic ionic liquids in enhancing the biosensing performance of affinity based immunochemical biosensors in human sweat. Two ionic liquids, 1-butyl-3-methylimidazolium tetrafluoroborate (BMIM[BF4 ]) and choline dihydrogen phosphate (Choline[DHP]) were investigated in this study with Choline[DHP] being more kosmotropic in nature having a more protein stabilizing effect based on the hofmeister series...
August 3, 2018: Analytica Chimica Acta
Kamil Paduszyński
Conductor-like screening model for real solvents (COSMO-RS) is nowadays one of the most popular and commonly applied tools for estimation of thermodynamic properties of complex fluids. The goal of this work is to provide a comprehensive review and analysis of the performance of this approach in calculating liquid-liquid equilibrium (LLE) phase diagrams in ternary systems composed of ionic liquid (IL) and two molecular compounds belonging to diverse families of chemicals (alkanes, aromatics, S/N-compounds, alcohols, ketones, ethers, carboxylic acid, esters and water)...
March 13, 2018: Journal of Physical Chemistry. B
Shugo Sato, Satoru Ohisa, Yukihiro Hayashi, Ryo Sato, Daisuke Yokoyama, Tetsuya Kato, Michinori Suzuki, Takayuki Chiba, Yong-Jin Pu, Junji Kido
A lot of research, mostly using electron-injection layers (EILs) composed of alkali-metal compounds has been reported with a view to increase the efficiency of solution-processed organic light-emitting devices (OLEDs). However, these materials have intractable properties, such as a strong affinity for moisture, which cause the degradation of OLEDs. Consequently, optimal EIL materials should exhibit high electron-injection efficiency as well as be stable in air. In this study, polymer light-emitting devices (PLEDs) based on the commonly used yellow-fluorescence-emitting polymer F8BT, which utilize poly(diallyldimethylammonium)-based polymeric ionic liquids, are experimentally and analytically investigated...
March 13, 2018: Advanced Materials
Ming Li, Yonglai Xue, Zhenjiang Liu, Jin Guo, Liyun Liu, Yuanyuan Zhang, Lu Gao, Lizhao Wang, Yin Cui, Daolin Du
Arabidopsis thaliana was selected as model organisms to investigate the toxic effect and mechanism of four kinds of imidazolium and pyridinium ionic liquids (ILs) on plant seedling taproots. After exposure to ILs, the growth of seedling taproots was significantly inhibited in a dose-dependent manner. The toxicity of ILs on seedling taproots was [Bmim][BF4 ] > [Bmpy][BF4 ] > [Bmim][Br] > [Bmpy][Br]. The reduction of seedling root cell vitality, aggravation of seedling root cell death, and repression of gravitropic growth responses were observed...
March 12, 2018: Environmental Science and Pollution Research International
Jia Wu, Zilin Xu, Yixuan Pan, Yi Shi, Xiujie Bao, Jun Li, Yu Tong, Han Tang, Shuyan Ma, Xuedong Wang, Jianxin Lyu
Herein, a novel magnetic effervescence tablet-assisted microextraction coupled to in situ metathesis reaction of ionic liquid (IS-META-ILDM) is presented for the determination of four endogenous steroids in human urine, pregnant women's blood, and fetal umbilical cord blood. The magnetic effervescent tablets, which were composed of Fe3 O4 nanoparticles, sodium carbonate (alkaline source), and tartaric acid (acidic source), were used to disperse the extractant and for convenient magnetic separation. After the effervescent reaction, in situ reaction between NH4 PF6 and [C6 MIM]BF4 was adopted to change hydrophilic ionic liquid to hydrophobic liquid, which could be separated from the aqueous phase...
March 12, 2018: Analytical and Bioanalytical Chemistry
Zhu Liang, Wei Bu, Karl J Schweighofer, David J Walwark, Jeffrey S Harvey, Glenn R Hanlon, Daniel Amoanu, Cem Erol, Ilan Benjamin, Mark L Schlossman
During solvent extraction, amphiphilic extractants assist the transport of metal ions across the liquid-liquid interface between an aqueous ionic solution and an organic solvent. Investigations of the role of the interface in ion transport challenge our ability to probe fast molecular processes at liquid-liquid interfaces on nanometer-length scales. Recent development of a thermal switch for solvent extraction has addressed this challenge, which has led to the characterization by X-ray surface scattering of interfacial intermediate states in the extraction process...
March 12, 2018: Proceedings of the National Academy of Sciences of the United States of America
Jianfeng Sun, Nil Tandogan, April Z Gu, Sinan Müftü, Edgar D Goluch, Kai-Tak Wan
A microfluidic device was designed to investigate filtration of particles in an electrolyte in the presence of liquid flow. Polystyrene spheres in potassium chloride solution at concentrations of 3-100 mM were allowed to settle and adhere to a glass substrate. A particle free solution at the same concentration was then flushed through the microfluidic channel at 0.03-4.0 mL/h. As the hydrodynamic drag on the adhered particles exceeded the intersurface interaction with the substrate, "pull-off" occurred and the particles detached...
February 21, 2018: Colloids and Surfaces. B, Biointerfaces
Fangyou Yan, Wensi He, Qingzhu Jia, Shuqian Xia, Qiang Wang
The quantitative structure-activity relationship (QSAR) model is an effective alternative to traditional experimental toxicity testing, which is undoubtedly important for modern environmental risk assessment and property prediction. Based on this background, the toxicological effects of ionic liquids (ILs) against Candida albicans (C. albicans) were studied via the QSAR method. A large diverse group of 141 and 85 ILs that have a minimal inhibitory concentration (MIC) and a minimum fungicidal concentration (MBC) against C...
February 26, 2018: Chemosphere
Joshua A Hammons, Fan Zhang, Jan Ilavsky
HYPOTHESIS: Many applications of deep eutectic solvents (DES) rely on exploitation of their unique yet complex liquid structures. Due to the ionic nature of the DES components, their diffuse structures are perturbed in the presence of a charged surface. We hypothesize that it is possible to perturb the bulk DES structure far (>100 nm) from a curved, charged surface with mesoscopic dimensions. EXPERIMENTS: We performed in situ, synchrotron-based ultra-small angle X-ray scattering (USAXS) experiments to study the solvent distribution near the surface of charged mesoporous silica particles (MPS) (≈0...
March 3, 2018: Journal of Colloid and Interface Science
Anna Gołąbiewska, Marta Paszkiewicz-Gawron, Aleksandra Sadzińska, Wojciech Lisowski, Ewelina Grabowska, Adriana Zaleska-Medynska, Justyna Łuczak
To investigate the effect of the ionic liquid (IL) chain length on the surface properties and photoactivity of TiO2 , a series of TiO2 microspheres have been synthesized via a solvothermal method assisted by 1-methyl-3-octadecylimidazolium chloride ([ODMIM][Cl]) and 1-methyl-3-tetradecylimidazolium chloride ([TDMIM][Cl]). All as-prepared samples were characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), diffuse reflectance spectroscopy (DRS), scanning transmission microscopy (STEM) and the Brunauer-Emmett-Teller (BET) surface area method, whereas the photocatalytic activity was evaluated by the degradation of phenol in aqueous solution under visible light irradiation (λ > 420 nm)...
2018: Beilstein Journal of Nanotechnology
Javier González-Sálamo, Miguel Ángel González-Curbelo, Bárbara Socas-Rodríguez, Javier Hernández-Borges, Miguel Ángel Rodríguez-Delgado
A new hollow fiber liquid-phase microextraction (HF-LPME) method has been developed for the extraction of a group of phthalic acid esters (PAEs) of interest from different water samples prior to gas chromatography tandem mass spectrometry analysis. HF-LPME was carried out using 1-octanol as extraction solvent followed by a back extraction step with cyclohexane. The different parameters that affect HF-LPME such as sample pH, ionic strength, extraction time, stirring rate, extraction temperature and back extraction conditions were investigated...
March 1, 2018: Chemosphere
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