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ionic liquids

Jan Leipert, Ingrid Bobis, Sabine Schubert, Helmut Fickenscher, Matthias Leippe, Andreas Tholey
The identification and quantification of molecules involved in bacterial communication are major prerequisites for the understanding of interspecies interactions at the molecular level. We developed a procedure allowing the determination of 2-heptyl-4(1H)-quinolone (HHQ) and 2-heptyl-3-hydroxy-4(1H)-quinolone (PQS) and the virulence factor pyocyanin (PYO) formed by the Gram-negative bacterium Pseudomonas aeruginosa. The method is based on dispersive liquid-liquid microextraction from small supernatant volumes (below 10 μL) followed by quantitative matrix-assisted laser desorption/ionization (MALDI) mass spectrometry (MS)...
February 22, 2018: Analytical and Bioanalytical Chemistry
Nail Altunay, Dilay Ülüzger, Ramazan Gürkan
There is a great importance of monitoring thiabendazole (TBZ) residues in fruits and vegetables to ensure food safety. Therefore, a new ionic liquid phase microextraction method using ionic liquid (IL), 1-butyl-3-methylimidazoliumhexafluorophosphate [C4 mim][PF6 ], as extracting solvent is proposed for simple and fast determination of low levels of TBZ in fruits and vegetables by spectrophotometry. The method is based on selective complex formation of TBZ with Cu(II) ions in presence of PF6 - as counter ion at pH 5...
February 22, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
Zhanyu Li, Bangbang Niu, Jian Liu, Jianling Li, Feiyu Kang
In recent years, a rechargeable aluminum-ion battery based on ionic liquid electrolyte is being extensively explored due to three electron electrochemical reactions, rich resources, and safety. Herein, a rechargeable Al-ion battery comprised of MoS2 microsphere cathode, aluminum anode and ionic liquid electrolyte has been fabricated for the first time. It can be found that Al3+ intercalates into the MoS2 during the electrochemical reaction, but aluminum storage mechanism is different at the electrode material interface and internal...
February 22, 2018: ACS Applied Materials & Interfaces
Abhishek Lahiri, Natalia Borisenko, Frank Endres
Electrode materials as well as the electrolytes play a decisive role in batteries determining their performance, safety, and lifetime. In the last two decades, different types of batteries have evolved. A lot of work has been done on lithium ion batteries due to their technical importance in consumer electronics, however, the development of post-lithium systems has become a focus in recent years. This chapter gives an overview of various battery materials, primarily focusing on development of electrode materials in ionic liquids via electrochemical route and using ionic liquids as battery electrolyte components...
February 21, 2018: Topics in Current Chemistry (Journal)
Idaira Pacheco-Fernández, Verónica Pino, Jacob Lorenzo-Morales, Juan H Ayala, Ana M Afonso
A novel ionic liquid (IL)-based microextraction method has been developed for the determination of four hydroxylated polycyclic aromatic hydrocarbons (OHPAHs) in urine samples. The water soluble IL-based surfactant selected as extraction solvent is decylguanidinium chloride (C10 Gu-Cl), the cytotoxicity and micellar behavior of which were evaluated. The proposed salt-induced IL-based preconcentration method simply consists in adding NaClO4 to the aqueous medium containing the IL to promote its water insolubility...
February 22, 2018: Analytical and Bioanalytical Chemistry
Evgeny Senokos, Yunfu Ou, Juan Jose Torres, Federico Sket, Carlos González, Rebeca Marcilla, Juan J Vilatela
This work presents a method to produce structural composites capable of energy storage. They are produced by integrating thin sandwich structures of CNT fiber veils and an ionic liquid-based polymer electrolyte between carbon fiber plies, followed by infusion and curing of an epoxy resin. The resulting structure behaves simultaneously as an electric double-layer capacitor and a structural composite, with flexural modulus of 60 GPa and flexural strength of 153 MPa, combined with 88 mF/g of specific capacitance and the highest power (30 W/kg) and energy (37...
February 21, 2018: Scientific Reports
Haimei Zhou, Ping Lv, Hang Qi, Jinqi Ma, Jianji Wang
Numerous applications of ionic liquids (ILs) are often accompanied with the generation of aqueous wastes. Due to the high toxicity and poor biodegradability of ILs, effective chemical treatment is great of importance for their removal from aqueous solution. In this work, an ultrasound-assisted zero-valent iron/activated carbon (US-ZVI/AC) micro-electrolysis technique was used to degrade residual functionalized ILs, 1-butyl-3-methyl benzimidazolium bromide ([BMBIM]Br) and 1-allyl-3-methylimidazolium chloride ([AMIM]Cl) in aqueous solution, and the degradation degree, degradation kinetics and possible degradation pathways were investigated...
February 21, 2018: Environmental Technology
Alexander E Khudozhitkov, Peter Stange, Anne-Marie Bonsa, Viviane Overbeck, Andreas Appelhagen, Alexander G Stepanov, Daniil I Kolokolov, Dietmar Paschek, Ralf Ludwig
The heterogeneity in dynamics has important consequences for understanding the viscosity, diffusion, ionic mobility, and the rates of chemical reactions in technology relevant systems such as polymers, metallic glasses, aqueous solutions, and inorganic materials. Herein, we study the spatial and dynamic heterogeneities in ionic liquids by means of solid state NMR spectroscopy. In the2 H spectra of the protic ionic liquid [TEA][OTf] we observe anisotropic and isotropic signals at the same time. The spectra measured below the melting temperature at 306 K could be simulated by a superposition of the solid and liquid line shapes, which provided the transition enthalpies between the rigid and mobile fractions...
February 21, 2018: Chemical Communications: Chem Comm
Shailee V Tiwari, Julio A Seijas, Maria Pilar Vazquez-Tato, Aniket P Sarkate, Kshipra S Karnik, Anna Pratima G Nikalje
Herein, we report an environmentally friendly, rapid, and convenient ionic liquid ([Et₃NH][HSO₄])-promoted facile synthesis of ethyl 4-(6-substituted-4-oxo-4H-chromen-3-yl)-6-methyl-2-thioxo/oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate derivatives 4 ( a - f ) and 4-(6-substituted-4-oxo-4H-chromen-3-yl)-6-methyl-2-thioxo/oxo-1,2,3,4-tetrahydropyrimidine-5- carbohydrazide derivatives 6 ( a - f ). All the synthesized derivatives 4 ( a - f ) and 6 ( a - f ) were evaluated for their in vitro antifungal and antibacterial activity, by method recommended by National Committee for Clinical Laboratory Standards (NCCLS)...
February 16, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Bushra Iqbal, Zenab Sarfaraz, Nawshad Muhammad, Pervaiz Ahmad, Jibran Iqbal, Zia Ul Haq Khan, Girma Gonfa, Farasat Iqbal, Arshad Jamal, Abdur Rahim
In this study, collagen/alginate/hydroxyapatite beads having different proportions were prepared as bone fillers for the restoration of osteological defects. Ionic liquid was used to dissolve the collagen and subsequently the solution was mixed with sodium alginate solution. Hydroxyapatite was added in different proportions, with the rationale to enhance mechanical as well as biological properties. The prepared solutions were given characteristic bead shapes by dropwise addition into calcium chloride solution...
February 20, 2018: Journal of Biomaterials Science. Polymer Edition
Hyunyoung Kim, Hiesang Sohn, Sang Wook Kang
CdO nanoparticles were utilized in the fabrication of a composite membrane containing the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate (BMIM+BF-4) for CO2 separation. The use of BMIM+BF-4containing CdO nanoparticles as a CO2 separator greatly improved separation performance. The ideal selectivity for CO2/N2 was 32.5 with a CO2 permeance of 57.1 GPU when CdO 4 liquid. The enhanced separation performance nanoparticles were incorporated into the BMIM+BF-4and the was attributed to increased CO2 solubility facilitated by both the free ions in BMIM+BF-4 oxide layer of the CdO nanoparticle...
August 1, 2018: Journal of Nanoscience and Nanotechnology
Abhishek Lahiri, Maryam Shapouri Ghazvini, Giridhar Pulletikurthi, Tong Cui, Volker Klemm, David Rafaja, Frank Endres
In electrochemistry, the electrode/electrolyte interface (EEI) governs the charge/mass transfer processes and controls the nucleation/growth phenomena. The EEI in ionic liquids (IL) can be controlled by changing the cation/anion of the IL, salt concentration, electrode potential and temperature. In this paper, we show that adding a dopant salt leads to the deposition of nanowires. To illustrate, zinc nanowires were electrodeposited from ZnCl2/1-butyl-1-methylpyrrolidinium trifluoromethylsulfonate in presence of GaCl3 as a dopant salt...
February 19, 2018: Journal of Physical Chemistry Letters
Stella M Lu, Gregory D Fairn
The plasma membrane is compartmentalized into several distinct regions or domains, which show a broad diversity in both size and lifetime. The segregation of lipids and membrane proteins is thought to be driven by the lipid composition itself, lipid-protein interactions and diffusional barriers. With regards to the lipid composition, the immiscibility of certain classes of lipids underlies the "lipid raft" concept of plasmalemmal compartmentalization. Historically, lipid rafts have been described as cholesterol and (glyco)sphingolipid-rich regions of the plasma membrane that exist as a liquid-ordered phase that are resistant to extraction with non-ionic detergents...
February 18, 2018: Critical Reviews in Biochemistry and Molecular Biology
Gurbir Singh, Manvir Kaur, Markus Drechsler, Tejwant Singh Kang
The formation of ultra-thin 2D crystalline nano-sheets, -spindles and -ribbons by self-assembly of benzimidazolium-based single-tailed surface active ionic liquids (SAILs) is observed for the first time. The nature of formed bilayer architectures is governed by the functionalization of alkyl chains of SAILs via an amide or ester moiety.
February 19, 2018: Chemical Communications: Chem Comm
Raúl Porcar, Daniel Nuevo, Eduardo García-Verdugo, Pedro Lozano, José Sanchez-Marcano, M Isabel Burguete, Santiago V Luis
Porous monolithic advanced functional materials based on supported ionic liquid-like phase (SILLP) systems were used for the preparation of oleophilic and hydrophobic cylindrical membranes and successfully tested as eco-friendly and safe systems for oil/water separation and for the continuous integration of catalytic and separation processes in an aqueous-organic biphasic reaction system.
February 19, 2018: Chemical Communications: Chem Comm
Changyan Guo, Yonghong Zhang, Yi Zhang, Jide Wang
Although nickel-based materials exhibit similar catalytic activity to palladium in organic synthesis, the selective oxidation of inert C-H bonds in the absence of other co-catalysts remains a largely unsolved challenge. This paper introduces a facile and efficient approach for enhancing the catalytic activity of Ni-MOF-74 with [bmim]Br via a relay catalysis strategy, which is excellent for the selective oxidation of benzylic C-H bonds. Notably, the catalyst recycling and scale up experiments demonstrated the practicability of the protocol...
February 19, 2018: Chemical Communications: Chem Comm
Yasuyuki Yokota, Hiroo Miyamoto, Akihito Imanishi, Kouji Inagaki, Yoshitada Morikawa, Ken-Ichi Fukui
It has been observed that the properties of room temperature ionic liquids near solid substrates are different from those of bulk liquids, and these properties play an important role in the development of catalysts, lubricants, and electrochemical devices. In this paper, we report microscopic studies of ionic liquid/solid interfaces performed using molecular dynamics simulations. The structural and dynamic properties of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (BMIM-TFSI) on mica and graphite interfaces were thoroughly investigated to elucidate the microscopic origins of the formation of layered structures at the interfaces...
February 19, 2018: Physical Chemistry Chemical Physics: PCCP
Belén Herce-Sesa, José A López-López, Carlos Moreno
Transition metals Cd, Pd and Ag are toxic even at very low concentration. Cd is considered a priority substance; while, Pd and Ag are emerging pollutants. Membrane technologies have been applied for their extraction; however, they require important amounts of reagents, time and energy. Additionally, effective reagents for metal extraction in saline natural waters are limited. In this case, hollow fiber liquid phase micro-extraction with a configuration of solvent bar (SBME) using the ionic liquid Cyphos® 101 as extractant is proposed...
February 12, 2018: Journal of Hazardous Materials
Xiangyu Song, Lijuan Zhou, Beibei Ding, Xiang Cui, Yongxin Duan, Jianming Zhang
Cellulose nanocrystals (CNCs) are predominantly obtained by the traditional sulfuric acid hydrolysis process. However, as-prepared CNCs powder features low thermal stability and poor redispersibility due to the existence of sulfonate groups and the hydrogen bond interaction among particles. Herein, by mixing the ionic liquid [BMIm][BF4 ] with freshly prepared CNCs without dialysis through a simple rotary evaporate procedure, the simultaneous improvement of thermal stability and redispersibility of CNCs has been achieved...
April 15, 2018: Carbohydrate Polymers
Jie Wang, Chunli Gong, Sheng Wen, Hai Liu, Caiqin Qin, Chuanxi Xiong, Lijie Dong
Poor dispersion and inert ionic conduction are two major obstacles towards using carbon nanotubes (CNTs) to modify polymer electrolyte membranes (PEMs) in energy conversion devices. In this work, solvent-free carbon nanotube fluids (CNT fluids) with liquid-like behavior are prepared through an ion exchange method and incorporated into a chitosan (CS) matrix to fabricate composite membranes. The electrostatic interactions between SO3 - groups in the CNT fluids and NH2 groups in the CS matrix, in addition to the unique flow properties of the CNT fluids, promote the uniform dispersion of CNT fluids in the CS matrix...
April 15, 2018: Carbohydrate Polymers
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