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Ionic liquid

Huidan Wei, Yongtao Wang, Jia Yao, Haoran Li
The physicochemical properties including melting point, density, viscosity, conductivity, and surface tension as well as spectral properties such as infrared and EPR spectra of the chelate-based ILs [Cnmim][Cu(F6-acac)3] (n = 6, 8, 10, 12, 14) were studied as functions of temperature and chain length. The thermodynamic properties such as the standard molar entropy and crystal energy were estimated by Glasser's theory, the molar enthalpy of vaporization was calculated by Kabo's method, and the ionicity was estimated by the Walden rule...
January 22, 2018: Physical Chemistry Chemical Physics: PCCP
Shuanggen Wu, Liangbin Zeng, Chaoyun Wang, Yuanru Yang, Wanlai Zhou, Fenfang Li, Zhijian Tan
Cytotoxicity studies are important tools for the assessment of the toxicity of ionic liquids (ILs). In the present study, the cytotoxicity of eleven ILs against Spodoptera frugiperda 9 (Sf-9) cell lines were evaluated via 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assays. The effect on cellular morphology, ultrastructural morphology, and nuclear morphology induced by 1-ethyl-3-methylimidazolium bromide ([C2mim][Br]) was studied via inverted light microscopy observation, acridine orange staining, and transmission electron microscope (TEM) analysis, respectively...
January 17, 2018: Journal of Hazardous Materials
Kartik Pilar, Victor Balédent, Mehdi Zeghal, Patrick Judeinstein, Sangsik Jeong, Stefano Passerini, Steve Greenbaum
X-ray scattering measurements were utilized to probe the effects of pressure on a series of ionic liquids, N-alkyl-N-methyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr1A-TFSI) (A = 3, 6, and 9), along with mixtures of ionic liquid and 30 mol. % lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt. No evidence was found for crystallization of the pure ionic liquids or salt mixtures even at pressures up to 9.2 GPa. No phase separation or demixing was observed for the ionic liquid and salt mixtures...
January 21, 2018: Journal of Chemical Physics
Shipeng Chen, Baohao Zhang, Nanxiang Zhang, Fengsheng Ge, Bao Zhang, Xiaoji Wang, Jian Song
Formation of supramolecular ionic liquid gels (ionogels) induced by low-molecular mass gelators (LMMGs) is an efficient strategy to confine ionic liquids and the negligible influence of LMMGs on the electrochemical properties of ionic liquids makes ionogels ideal quasi-solid electrochemical materials. Furthermore, the stimuli-responsive and self-healing characters of the supramolecular gel can be utilized for the potential development of smart electrochemical materials. However, the poor mechanical properties of supramolecular ionogel reported so far limit their practical applications...
January 19, 2018: ACS Applied Materials & Interfaces
Ke Ma, Jan Forsman, Clifford E Woodward
We develop an extended classical density-functional theory to describe clustering of imidazolium-based cations into linear chains, driven by π-π stacking. We find that the associating system displays a similar short-ranged structure to the completely dissociated fluid. We also construct a restricted primitive model for associating ionic species in an RTIL+solvent mixture. The double-layer formed in these systems exhibits strong overscreening by the cation chains, as expected. Significantly enhanced capacitance is also observed for the case where counterions are the associating species...
December 2017: Physical Review. E
Antarip Poddar, Jayabrata Dhar, Suman Chakraborty
Advent of nematic liquid crystal flows has attracted renewed attention in view of microfluidic transport phenomena. Among various transport processes, electro-osmosis stands as one of the efficient flow actuation mechanisms through narrow confinements. In the present study, we explore the electrically actuated flow of an ordered nematic fluid with ionic inclusions, taking into account the influences from surface-induced elasticity and electrical double layer (EDL) phenomena. Toward this, we devise the coupled flow governing equations from fundamental free-energy analysis, considering the contributions from first- and second-order elastic, dielectric, flexoelectric, charged surface polarization, ionic and entropic energies...
July 2017: Physical Review. E
Xiaofu Sun, Lu Lu, Qinggong Zhu, Congyi Wu, Dexin Yang, Chunjun Chen, Buxing Han
Electrochemical reduction of CO2 into value-added product is an interesting area. In this work, we synthesized MoP nanoparticles supported on porous carbon using metal-organic frameworks as the carbon precusor, and conducted the first work on CO2 electroreduction using MoP-based catalyst. It was discovered that MoP nanoparticles supported on In-doped porous carbon had outstanding performance for CO2 reduction to formic acid. The Faradaic efficiency and current density could reach 96.5 % and 43.8 mAcm-2, respectively, when using ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate as the supporting electrolyte...
January 18, 2018: Angewandte Chemie
Aleksandra Piotrowska, Anna Syguda, Bogdan Wyrwas, Lukasz Chrzanowski, Till Luckenbach, Hermann J Heipieper
Ionic liquids consisting of a combination of herbicidal anions with a quaternary ammonium cation act as efficient herbicides, which are under consideration to be used in the agriculture. In the present study, we used embryos of the zebrafish (Danio rerio) as a model to assess the toxic potential of ammonium-based ionic liquids for aquatic organisms. As we assumed interference of the partially hydrophobic ionic liquid cation with lipids, we investigated the adaptation response in the lipid composition of the zebrafish embryos, triggered by the ionic compound...
2018: PloS One
Alexander Venker, Tobias Vollgraff, Jörg Sundermeyer
New ferrocenylsulfonium cation based ionic liquids were prepared by direct alkylation of the corresponding ferrocenyl-based thioethers with N-alkylbis(trifluoromethanesulfonyl)imides (R'TFSI). This convenient direct access to organometallic sulfonium bis(trifluoromethanesulfonyl)imide (TFSI) salts without the need for ion exchange was chosen in order to obtain highly pure and reversibly redox active room temperature ILs in many cases. In other cases the anion cation interaction in the solid state was studied by XRD analyses...
January 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Jong Baek Park, Mehmet Isik, Hea Jung Park, In Hwan Jung, David Mecerreyes, Do-Hoon Hwang
Interfacial layers play a critical role in building up the ohmic contact between the electrodes and functional layers in organic photovoltaic solar cells. These layers are based on either inorganic oxides (ZnO, TiO2) or water-soluble organic polymers such as poly[(9,9-dioctyl-2,7-fluorene)-alt-(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)] (PFN) and polyethylenimine ethoxylated (PEIE). In this work, we have developed a series of novel poly(ionic liquid) non-conjugated block copolymers for improving the performance of inverted organic photovoltaic cells (OPVs) by acting as work function modifiers of indium tin oxide (ITO) cathode...
January 17, 2018: ACS Applied Materials & Interfaces
Naoya Nishi, Ikumi Yajima, Ken-Ichi Amano, Tetsuo Sakka
Janus-type Au/polythiophene (PT) composites have been prepared by utilizing the liquid/liquid interface between water (W) and a hydrophobic ionic liquid (IL) as the redox reaction site. AuCl4- are reductively deposited and terthiophene are oxidatively polymerized spacio-selectively at the IL|W interface, leading to the formation of the Au/PT composites. The composites are Janus-type Au-attached PT plates with two surface morphologies, flat surface and flower-like surface at the W and IL sides of the plates at the IL|W interface, respectively...
January 16, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Silke Wolf, Wim Klopper, Claus Feldmann
The germanium-iron cluster Ge12{Fe(CO)3}8(μ-I)4 was prepared by reacting GeI4 and Fe2(CO)9 in [BMIm]Cl/AlCl3 as ionic liquid (BMIm: 1-butyl-3-methylimidazolium). The cluster contains a Ge12Fe8 metal core consisting of a central Ge4 rectangle, two Ge2 pairs, and four single Ge atoms. These Ge units are interconnected by Fe atoms to a real Ge-Fe cluster. According to DFT calculations, Hund's localization criterion is fulfilled for the whole cluster if we assume three different atomic charges on the Ge4, Ge2, and Ge units...
January 16, 2018: Chemical Communications: Chem Comm
Yongyuan Ren, Jiangna Guo, Dan Xu, Jing Qin, Qian Lu, Feng Yan
Pollutants in wastewater include oils, dyes, and bacteria, making wastewater cleanup difficult. Here, we propose the preparation of multifunctional wastewater treatment media, poly(ionic liquid) grafted polypropylene (PP) nonwoven fabrics (PP@PIL), prepared via a simple and scalable surface grafting process. The fabricated PP@PIL fabrics exhibited superior switchable oil/water separation (η > 99%) and dye absorption performance (q = 410 mg/g), as well as high antibacterial properties. The oil/water separation could be easily switched via anion-exchanging of PIL segments...
January 15, 2018: ChemSusChem
Guihua Gao, Sijia Li, Shuo Li, Yudan Wang, Pan Zhao, Xiangyu Zhang, Xiaohong Hou
In this work, computational and experimental methods were used to study the adsorption of estrogens and glucocorticoids on metal-organic frameworks (MOFs). Computer-aided molecular simulation was applied to predict the adsorption of eight analytes on four MOFs (MIL-101(Cr), MIL-100(Fe), MIL-53(Al), and UiO-66(Zr)) by examining molecular interactions and calculating free binding energies. Subsequently, the four water-stable MOFs were synthesized and evaluated as adsorbents for the target hormones in aqueous solution...
April 1, 2018: Talanta
Marieke De Boeck, Lisa Dubrulle, Wim Dehaen, Jan Tytgat, Eva Cuypers
This study aims to prove that ionic liquids (ILs) can be used as extraction solvents in a liquid-liquid microextraction, coupled to LC-MS/MS, for the quantification of a large group of antidepressants in whole blood samples. The sample preparation procedure consisted of adding 1.0mL aqueous buffer pH 3.0 and 60µL of IL (1-butyl-3-methylimidazolium hexafluorophosphate) to 1.0mL whole blood. Subsequently, a 5-min rotary mixing step was performed followed by centrifugation. The lower IL phase was collected, diluted 1:10 in methanol and 10µL was injected into the LC-MS/MS...
April 1, 2018: Talanta
Shin-Ichi Ohira, Takayuki Yamasaki, Takumi Koda, Yuko Kodama, Kei Toda
Preconcentration is an effective way to improve analytical sensitivity. Many types of methods are used for enrichment of ionic solute analytes. However, current methods are batchwise and include procedures such as trapping and elution. In this manuscript, we propose in-line electrodialytic enrichment of ionic solutes. The method can enrich ionic solutes within seconds by quantitative transfer of analytes from the sample solution to the acceptor solution under an electric field. Because of quantitative ion transfer, the enrichment factor (the ratio of the concentration in the sample and to that in the obtained acceptor solution) only depends on the flow rate ratio of the sample solution to the acceptor solution...
April 1, 2018: Talanta
Sumit Kumar Panja, Nitin Srivastava, Jyoti Srivastava, Namburi Eswara Prasad, Hemanth Noothalapati, Shinsuke Shigeto, Satyen Saha
A simple change from alkyl group to alkene in side chain of imidazolium cation with same anion resulted in a drastic impact on physical properties (e.g., melting point) from bmimPF6 IL to cmimPF6 IL. The underlying reasons have been elucidated by structural and interaction studies with the help of DSC, SCXRD, vibrational and multi-nuclear NMR spectroscopic techniques. Experiments reveal existence of new weak interactions involving the carbon and π cloud of the imidazolium aromatic ring with fluoride of PF6 anion (i...
December 19, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Souvik Kumar Paul, Saikat Chakraborty
Sunn hemp fibre - a cellulose-rich crystalline non-food energy crop, containing 75.6% cellulose, 10.05% hemicellulose, 10.32% lignin, with high crystallinity (80.17%) and degree of polymerization (650) - is identified as a new non-food substrate for lignocellulosic biofuel production. Microwave irradiation is employed to rapidly rupture the cellulose's glycosidic bonds and enhance glucose yield to 78.7% at 160 °C in only 46 min. The reactants - long-chain cellulose, ionic liquid, transition metal catalyst, and water - form a polar supramolecular complex that rotates under the microwave's alternating polarity and rapidly dissipates the electromagnetic energy through molecular collisions, thus accelerating glycosidic bond breakage...
January 3, 2018: Bioresource Technology
Wanwan Ma, Kyung Ho Row
A type of magnetic ionic liquid based molecularly imprinted polymer coated on SiO2 (Fe3O4@SiO2@IL-MIPs) was prepared with 1-vinyl-3-ethylimidazole ionic liquid as functional monomer, and 1,4-butane-3,3'-bis-1-ethylimidazole ionic liquid as cross linker, 4-Chlorophenol as template was successfully applied as a selective adsorbent for selective extraction of 5 chlorophenols in seawater samples by using the magnetic solid-phase extraction (MSPE) method. 11 types of Fe3O4@SiO2@IL-MIPs were synthesized and investigated for their different compositions of functional monomer (such as [C2min][Br], [C2min][BF4], [C2min][PF6], acrylamide, methacrylic acid and 4-vinyl pyridine) and cross-linker (such as [C4min2][Br], [C4min2][BF4], [C4min2][PF6], divinylbenzene, and ethylene glycol dimethacrylate), respectively...
January 6, 2018: Journal of Chromatography. A
Sin-Yi Liou, Wan-Ru Chen
Albendazole (ABZ) is a benzimidazole-based veterinary anthelmintic used extensively in the treatment of intestinal parasites. Due to its high hydrophobicity, ABZ tends to accumulate in soils and sediments in the environment. This study aims to investigate ABZ's possible degradation by manganese oxides. Minor effects from ionic strength and metal cations on ABZ degradation were observed. By contrast, decrease of pH greatly enhanced the reaction rate. Surface complexation between ABZ and MnO2 was indicated to be the dominant control in the reaction kinetics...
December 29, 2017: Journal of Hazardous Materials
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