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ionic liquids

Paola Dugo
No abstract text is available yet for this article.
March 21, 2017: Analytical and Bioanalytical Chemistry
Liwen Mu, Yijun Shi, Xiaojing Guo, Wei Zhuang, Long Chen, Tuo Ji, Jing Hua, Huaiyuan Wang, Jiahua Zhu
Two different heteroelement-rich molecules have been successfully grafted on graphene oxide (GO) sheets which were then used as lubricant additives in bio-ionic liquid. The grafting was processed with reactions between GO sheets and synthesized heteroelement-rich molecules (Imidazol-1-yl phosphonic dichloride and 1H-1,2,4-triazol-1-yl phosphonic dichloride, respectively). The modified GO (m-GO) was added into [Choline][Proline] ([CH][P]) bio-ionic liquid, and has been demonstrated effective additive in promoting lubrication...
March 9, 2017: Journal of Colloid and Interface Science
Paola D'Angelo, Valentina Migliorati, Alessandra Serva, Riccardo Spezia
A diluted solution of Ce(NO₃)₃ in the protic ionic liquid (IL) ethylammonium nitrate (EAN) is investigated using molecular dynamics (MD) simulations and extended X-ray absorption fine structure (EXAFS) spectroscopy. For the first time polarizable effects are included in the MD force field to describe a heavy metal ion in a protic IL, but, unlike water, they are found to be unessential. The CeIII ion first solvation shell is formed by nitrate ions arranged in an icosahedral structure, and an equilibrium between monodentate and bidentate ligands is present in the solution...
March 20, 2017: Chemistry: a European Journal
Maria Sarno, Lucia Baldino, Carmela Scudieri, Stefano Cardea, Paolo Ciambelli, Ernesto Reverchon
Energy density, safety, simple and environmentally friendly preparation methods are very significant aspects in the realization of a compact supercapacitor. Herein we report the use of a supercritical CO2 assisted gel drying process (SC-CO2) for the preparation of porous electrodes containing dispersed graphene in a Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) binder membrane to sandwich in a new portable supercapacitor based on graphene oxide (GO). A GO loading of 60 wt.% has been found to give the better combination of factors (porosity, wettability, mechanical and electrochemical properties,...
March 20, 2017: Nanotechnology
Siying Che, Rina Dao, Weidong Zhang, Xiaoyu Lv, Haoran Li, Congmin Wang
A novel anion-functionalized fluorescent ionic liquid was designed and prepared, which was capable of capturing sulphur dioxide with high capacity and could also be used as a good colorimetric and fluorescent SO2 sensor. Compared to conventional fluorescent sensors, this fluorescent ionic liquid did not undergo aggregation-caused quenching or aggregation-induced emission, and the fluorescence was quenched when exposed to SO2, and the fluorescence would quench when exposed to SO2. The experimental absorption, spectroscopic investigation, and quantum chemical calculations indicated that the quenching of the fluorescence originated from SO2 physical absorption, not chemical absorption...
March 20, 2017: Chemical Communications: Chem Comm
Sang-Don Lee, Kyu-Nam Jung, Hyeongil Kim, Hyun-Seop Shin, Seung-Wan Song, Min-Sik Park, Jong-Won Lee
All-solid-state lithium batteries offer notable advantages over conventional Li-ion batteries with liquid electrolytes in terms of energy density, stability, and safety. To realize this technology, it is critical to develop highly reliable solid-state inorganic electrolytes with high ionic conductivities and acceptable processability. Li1+xAlxTi2-x(PO4)3 (LATP) with a NASICON (Na superionic conductor)-like structure is regarded as a potential solid electrolyte, owing to its high "bulk" conductivity (~10-3 S cm-1) and excellent stability against air and moisture...
March 20, 2017: ChemSusChem
Jiu-Ju Feng, Xiao-Xiao Lin, Li-Xian Chen, Meng-Ting Liu, Junhua Yuan, Ai-Jun Wang
A facile one-pot coreduction strategy was developed to synthesize composition-tunable cross-linked AgPt aerogels, where ionic liquid (1-aminopropyl-3-methylimidazolium bromide, [APMIm]Br) played a significant role in controlling the morphology and structure. During the synthesis progress, Br(-) easily reacted with Ag(+) to form AgBr precipitate and consequently slowed down the reducing rate of Ag(+), as well as acting as a capping agent to promote the anisotropic growth of AgPt aerogels, as mainly demonstrated by the electronic microscopy, Brunauer-Emmett-Teller, X-ray diffraction and X-ray photoelectron spectroscopy analysis...
March 8, 2017: Journal of Colloid and Interface Science
Tomislav Vinković, Ondrej Novák, Miroslav Strnad, Walter Goessler, Darija Domazet Jurašin, Nada Parađiković, Ivana Vinković Vrček
The increasing development of different nanomaterials, such as silver nanoparticles (AgNPs), and their practical use in agriculture and biotechnology has created a strong need for elucidations of biological effects and risk assessments of AgNPs in plants. This study was aimed to investigate AgNPs effects on metal uptake and their biodistribution in pepper plants as well as on morphological parameters and hormonal responses of the isoprenoid cytokinin (CK) family. In addition, the comparison of effects silver form, nanoparticles vs...
March 14, 2017: Environmental Research
Chao Wang, Jie Bao, Wenxiao Pan, Xin Sun
Using direct numerical simulations, we provide a thorough study regarding the electrokinetics of ionic liquids. In particular, modified Poisson-Nernst-Planck (MPNP) equations are solved to capture the crowding and overscreening effects characteristic of an ionic liquid. For modeling electrokinetic flows in an ionic liquid, the MPNP equations are coupled with Navier-Stokes equations to study the coupling of ion transport, hydrodynamics, and electrostatic forces. Specifically, we consider the ion transport between two parallel charged surfaces, charging dynamics in a nanopore, capacitance of electric double-layer capacitors, electro-osmotic flow in a nanochannel, electroconvective instability on a plane ion-selective surface, and electroconvective flow on a curved ion-selective surface...
March 17, 2017: Electrophoresis
Alexander M Smith, Alpha A Lee, Susan Perkin
The structure and interactions in electrolytes at high concentration have implications from energy storage to biomolecular interactions. However, many experimental observations are yet to be explained in these mixtures, which are far beyond the regime of validity of mean-field models. Here, we study the structural forces in a mixture of ionic liquid and solvent that is miscible in all proportions at room temperature. Using the surface force balance to measure the force between macroscopic smooth surfaces across the liquid mixtures, we uncover an abrupt increase in the wavelength above a threshold ion concentration...
March 3, 2017: Physical Review Letters
Cassie Kimble, Christopher M Burba
Ionic liquids are a fertile and active area of research, in part, due to the unique properties these solvents offer over traditional molecular solvents. Since these properties are rooted in the fundamental ion-ion interactions that govern liquid structure, there is a strong motivation to characterize liquid structure. Infrared spectroscopy is a standard analytical tool for assessing the liquid structure, for the intramolecular vibrational modes of the composing the materials are often quite sensitive to the local environment about a given ion...
March 17, 2017: Journal of Physical Chemistry. B
I V Morozov, E B Deeva, T Yu Glazunova, S I Troyanov, F I Guseinov, L M Kustov
Ionic liquids that are stable toward oxidation and nitration and are based on the 1-n-butyl-3-methylimidazolium cation (BMIm(+)) can be used as solvents and reaction media for copper dissolution in liquid dinitrogen tetraoxide N2O4. The ionic liquid not only favors the dissociation of N2O4 into NO(+) and NO3(-), but also takes part in the formation of different crystalline products. Thus, NO[BF4], NO[Cu(NO3)3] and (BMIm)2[Cu2(CF3COO)6] were prepared using (BMIm)A, A(-) = [BF4](-), (CF3SO2)2N(-), CF3COO(-), respectively...
March 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Li Qin, Binshen Wang, Yongya Zhang, Li Chen, Guohua Gao
Hierarchical porous poly(ionic liquid)s (PILs) with high specific surface area were firstly synthesized via anion exchange. The exchange of bulky salicylate and its dimers/clusters in PILs by other smaller anions increased the specific surface area and fabricated a hierarchical porous structure. The high specific surface area and hierarchical porous structure prompted a high degree of exposure of the active sites and made the heterogeneous PIL catalysts contact with substrates sufficiently, enhancing their catalytic activity...
March 17, 2017: Chemical Communications: Chem Comm
Sou Ryuzaki, Makusu Tsutsui, Yuhui He, Kazumichi Yokota, Akihide Arima, Takanori Morikawa, Masateru Taniguchi, Tomoji Kawai
Rapid structural analysis of nanoscale matter in a liquid environment represents innovative technologies that reveal the identities and functions of biologically important molecules. However, there is currently no method with high spatio-temporal resolution that can scan individual particles in solutions to gain structural information. Here we report the development of a nanopore platform realizing quantitative structural analysis for suspended nanomaterials in solutions with a high z-axis and xy-plane spatial resolution of 35...
April 18, 2017: Nanotechnology
Svetlana V Muginova, Dina A Myasnikova, Sergei G Kazarian, Tatiana N Shekhovtsova
This paper reviews the primary literature reporting the use of ionic liquids (ILs) in optical sensing technologies. The optical chemical sensors that have been developed with the assistance of ILs are classified according to the type of resultant material. Key aspects of applying ILs in such sensors are revealed and discussed. They include using ILs as solvents for the synthesis of sensor matrix materials; additives in polymer matrices; matrix materials; modifiers of the surfaces; and multifunctional sensor components...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Shamraja S Nadar, Rohini G Pawar, Virendra K Rathod
The increasing interest of industrial enzymes demands for development of new downstream strategies for maximizing enzyme recovery. The significant efforts have been focused on the development of newly adapted technologies to purify enzymes in catalytically active form. Recently, an aqueous two phase system (ATPS) is emerged as powerful tools for efficient extraction and purification of enzymes due to their versatility, lower cost, process integration capability and easy scale-up. The present review gives an overview of effect of parameters such as tie line length, pH, neutral salts, properties of polymer and salt involved in traditional polymer/polymer and polymer/salt ATPS for enzyme recovery...
March 13, 2017: International Journal of Biological Macromolecules
Tuanan C Lourenço, Santiago Aparicio, Gabriela C Costa, Luciano T Costa
Despite the innumerous papers regarding the study of the ionic liquids as a potential candidate for CO2 capture, many details concerning the structure and dynamics of CO2 in the system are still to be revealed, i.e., the correlation between the local environment structure and the dynamic properties of the substance. This present work relied on the performance of molecular dynamics both for the neat [C2mim][Tf2N] and [C2mim][Tf2N]/CO2 mixtures in an attempt to elucidate the local environment of CO2 and their effects on the dynamic properties of [C2mim][Tf2N]...
March 14, 2017: Journal of Chemical Physics
Clio Deferm, Bieke Onghena, Tom Vander Hoogerstraete, Dipanjan Banerjee, Jan Luyten, Harald Oosterhof, Jan Fransaer, Koen Binnemans
Most metal extraction studies focus on the kinetics, the maximum loading and the extraction equilibrium, while structural information on the extracted complexes has been limited. This paper concerns the nature of the indium(iii) chloride complexes, present in the organic and aqueous phase during the solvent extraction of indium(iii) from an aqueous HCl solution by undiluted ionic liquids Cyphos(®) IL 101 and Aliquat(®) 336. In an aqueous HCl solution (0-12 M), indium(iii) exists as octahedral mixed complexes, [In(H2O)6-nCln](3-n) (0 ≤ n ≤ 6)...
March 15, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Ervin Kaminski Lenzi, Rafael S Zola, Haroldo Valentin Ribeiro, Denner Serafim Vieira, Federica Ciuchi, Alfredo Mazzulla, Nicola Scaramuzza, Luiz Roberto Evangelista
We argue that ion motion in electrolytic cells containing Milli--Q water, weak electrolytes, or liquid crystals may exhibit unusual diffusive regimes that deviate from the expected behavior, leading the system to present anomalous diffusion. Our arguments lie on the investigation of the electrical conductivity and its relation with the mean square displacement, which may be used to characterize the ionic motion. In our analysis, the PNP diffusional model is used with extended boundary conditions to simulated the charge transfer, accumulation and/or adsorption -- desorption at the electrodes surfaces...
March 15, 2017: Journal of Physical Chemistry. B
Rahul Kumar Sharma, Yogendra Nath Chouryal, Sushmita Chaudhari, Jeganathan Saravanakumar, Suhash Ranjan Dey, Pushpal Ghosh
Phase tuned quantum confined In2S3 nanocrystals are accessible solvothermally using task-specific ionic liquids (ILs) as structure directing agents. Selective tuning of size, shape, morphology and, most importantly, crystal phase of In2S3 is achieved by changing the alkyl side chain length, the H-bonding and aromatic -stacking ability of the 1-alkyl-3- methylimidazolium bromide ILs, [Cnmim]Br (n=2,4,6,8 and 10). It is observed that crystallite size is significantly less when ILs are used compared to the synthesis without ILs keeping the other reaction parameters same...
March 14, 2017: ACS Applied Materials & Interfaces
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