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https://www.readbyqxmd.com/read/28805215/the-influence-of-a-thermoresponsive-polymer-on-the-microdynamic-phase-transition-mechanisms-of-distinctly-structured-thermoresponsive-ionic-liquids
#1
Lan Ma, Ge Wang, Shengtong Sun, Peiyi Wu
The study of a ternary solution involving a thermoresponsive polymer, a thermoresponsive ionic liquid (IL), and a solvent will not only help with interpreting their distinct phase transition behavior, but also promote the development of novel thermoresponsive systems. In this paper, we investigate the influence of a conventional thermoresponsive polymer, poly(2-isopropyl-2-oxazoline) (PIPOZ), on the phase transition behavior of two thermoresponsive ILs ([P4,4,4,6][MC3S], [P4,4,4,4][SS]) with different structures...
August 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28802625/ionic-liquids-as-solvents-for-%C3%A4-erenkov-counting-and-the-effect-of-a-wavelength-shifter
#2
M Mirenda, D Rodrigues, C Ferreyra, P Arenillas, G P Sarmiento, N Krimer, M L Japas
We study the wavelength shift of the Čerenkov light - generated in the ionic liquid (BMIMCl) - caused by the addition of the highly fluorescent ionic liquid (BMIMHPTS). (18)F and (32)P efficiencies increases up to 124% and 14%, respectively, compared with the values obtained with pure BMIMCl. With this improvement, ionic liquid mixtures become a good alternative - when using the TDCR-Cherenkov technique - to standardize radionuclides having electron emissions energies close to the threshold energy in water (∼ 260keV)...
August 1, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28802527/application-of-an-immobilized-ionic-liquid-for-the-passive-sampling-of-perfluorinated-substances-in-water
#3
Lei Wang, Xinying Gong, Ruonan Wang, Zhiwei Gan, Yuan Lu, Hongwen Sun
Ionic liquids have been used to efficiently extract a wide range of polar and nonpolar organic contaminants from water. In this study, imidazole ionic liquids immobilized on silica gel were synthesized through a chemical bonding method, and the immobilized dodecylimidazolium ionic liquid was selected as the receiving phase material in a POCIS (polar organic chemical integrative sampler) like passive sampler to monitor five perfluoroalkyl substances (PFASs) in water. Twenty-one days of integrative accumulation was conducted in laboratory scale experiments, and the accumulated PFASs in the samplers were eluted and analyzed by high performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS/MS)...
August 2, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28801044/cationic-ionic-liquid-surfactant-polyacrylamide-gel-electrophoresis-for-enhanced-separation-of-acidic-and-basic-proteins-with-single-step-ribonuclease-b-glycoforms-separation
#4
Punprabhashi Vidanapathirana, Farhana Hasan, Kaitlyn Mussio, Anuja Pande, Michael Brands, Noureen Siraj, Anne Grove, Isiah M Warner
Cationic ionic liquids-based surfactants (ILS), such as 4-methyl pyridinium bromide (CnPBr, where n=4,6,8), were used in preparation of polyacrylamide gels, sample buffer, and running buffer for cationic ILS polyacrylamide gel electrophoresis (ILS-PAGE). These ILS are liquids in the pure state and were selected for improved separation of ribonuclease b (Rib b) glycoforms in a single step and a protein mixture containing bovine serum albumin (BSA, pI-4.8, 66.5kDa), ovalbumin (Ova, pI-4.6, 44.3kDa), α-chymotrypsinogen (α-Chy, pI-8...
July 29, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28799378/heterogeneous-nucleation-from-a-supercooled-ionic-liquid-on-a-carbon-surface
#5
Xiaoxia He, Yan Shen, Francisco R Hung, Erik E Santiso
Classical molecular dynamics simulations were used to study the nucleation of the crystal phase of the ionic liquid [dmim(+)][Cl(-)] from its supercooled liquid phase, both in the bulk and in contact with a graphitic surface of D = 3 nm. By combining the string method in collective variables [Maragliano et al., J. Chem. Phys. 125, 024106 (2006)], with Markovian milestoning with Voronoi tessellations [Maragliano et al., J. Chem. Theory Comput. 5, 2589-2594 (2009)] and order parameters for molecular crystals [Santiso and Trout, J...
December 7, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28799134/roles-of-polar-groups-and-aromatic-structures-of-biochar-in-1-methyl-3-octylimidazolium-chloride-ionic-liquid-adsorption-ph-effect-and-thermodynamics-study
#6
Qiuci Miao, Erping Bi, Binghua Li
Adsorption mechanisms of 1-methyl-3-octylimidazolium chloride ([OMIM]Cl) on rice straw-derived biochars produced at 400, 500, and 700 °C (referred as RB400, RB500, and RB700, respectively) were evaluated. Adsorption affinity followed the order of RB700 > RB400 > RB500. Electrostatic attraction and hydrogen bond controlled adsorption of [OMIM]Cl on RB400, while π-π EDA interaction between [OMIM]Cl and the aromatic rings of biochar dominated adsorption of RB500 and RB700. With increasing solution pH, -COOH and -OH on biochar became deprotonated...
August 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28799044/ionic-liquid-liquid-chromatography-a-new-general-purpose-separation-methodology
#7
REVIEW
Leslie Brown, Martyn J Earle, Manuela A Gîlea, Natalia V Plechkova, Kenneth R Seddon
Ionic liquids can form biphasic solvent systems with many organic solvents and water, and these solvent systems can be used in liquid-liquid separations and countercurrent chromatography. The wide range of ionic liquids that can by synthesised, with specifically tailored properties, represents a new philosophy for the separation of organic, inorganic and bio-based materials. A customised countercurrent chromatograph has been designed and constructed specifically to allow the more viscous character of ionic liquid-based solvent systems to be used in a wide variety of separations (including transition metal salts, arenes, alkenes, alkanes, bio-oils and sugars)...
August 10, 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28798222/an-integrated-approach-to-explore-composition-and-dynamics-of-cholesterol-rich-membrane-microdomains-in-sexual-stages-of-malaria-parasite
#8
Federica Fratini, Carla Raggi, Gabriella Sferra, Cecilia Birago, Anna Sansone, Felicia Grasso, Chiara Curr Agrave, Anna Olivieri, Tomasino Pace, Stefania Mochi, Leonardo Picci, Carla Ferreri, Antonella Di Biase, Elisabetta Pizzi, Marta Ponzi
Membrane microdomains that include lipid rafts, are involved in key physiological and pathological processes and participate in the entry of endocellular pathogens. These assemblies, enriched in cholesterol and sphingolipids, form highly dynamic, liquid-ordered phases that can be separated from the bulk membranes thanks to their resistance to solubilization by non-ionic detergents. To characterize complexity and dynamics of detergent-resistant membranes of sexual stages of the rodent malaria parasite Plasmodium berghei, here we propose an integrated study of raft components based on proteomics, lipid analysis and bioinformatics...
August 10, 2017: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/28797523/the-acute-toxic-effects-of-1-alkyl-3-methylimidazolium-nitrate-ionic-liquids-on-chlorella-vulgaris-and-daphnia-magna
#9
Cheng Zhang, Shuai Zhang, Lusheng Zhu, Jinhua Wang, Jun Wang, Tongtong Zhou
Given their increasingly widespread application, the toxic effects of ionic liquids (ILs) have become the subject of significant attention in recent years. Therefore, the present study assessed the acute toxic effects of 1-alkyl-3-methylimidazolium nitrate ([Cnmim]NO3 (n = 2, 4, 6, 8, 10, 12)) on Chlorella vulgaris and Daphnia magna. The sensitivity of the tested organism Daphnia magna and the investigated IL concentrations in water using high-performance liquid chromatography (HPLC) were also evaluated to demonstrate the reliability of the present study...
August 7, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28797165/spontaneous-cooling-absorption-of-co2-by-a-polymeric-ionic-liquid-for-direct-air-capture
#10
Tao Wang, Chenglong Hou, Kun Ge, Klaus S Lackner, Xiaoyang Shi, Jun Liu, Mengxiang Fang, Zhongyang Luo
A polymeric ionic liquid (PIL), with quaternary ammonium ions attached to the polymer matrix, displays CO2 affinity controlled by moisture. This finding led to the development of moisture swing absorption (MSA) for direct air capture (DAC) of CO2. This work aims to elucidate the role of water in MSA. For some humidity range, CO2 absorption is an endothermic process associated with concurrent dehydration of the sorbent. The thermodynamic behavior of water indicates a decreased hydrophilicity of the PIL as the mobile anion transforms from CO32- to HCO3- during CO2 absorption...
August 10, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28796492/structural-and-morphological-description-of-sn-snox-core-shell-nanoparticles-synthesized-and-isolated-from-ionic-liquid
#11
Nadia Soulmi, Damien Dambournet, Cécile Rizzi, Juliette Sirieix-Plénet, Mathieu Duttine, Alain Wattiaux, Jolanta Swiatowska, Olaf J Borkiewicz, Henri Groult, Laurent Gaillon
The potential application of high capacity Sn-based electrode materials for energy storage, particularly in rechargeable batteries, has led to extensive research activities. In this scope, the development of an innovative synthesis route allowing to downsize particles to the nanoscale is of particular interest owing to the ability of such nanomaterial to better accommodate volume changes upon electrochemical reactions. Here, we report on the use of room temperature ionic liquid (i.e., [EMIm(+)][TFSI(-)]) as solvent, template, and stabilizer for Sn-based nanoparticles...
August 10, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28795699/photoexcitation-dynamics-of-p-nitroaniline-and-n-n-dimethyl-p-nitroaniline-in-1-alkyl-3-methylimidazolium-cation-based-ionic-liquids-with-different-alkyl-chain-lengths
#12
Y Kimura, S Ibaraki, R Hirano, Y Sugita, Y Yasaka, M Ueno
Photoexcitation dynamics of p-nitroaniline (pNA) and N,N-dimethyl-p-nitroaniline (DMpNA) in 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([Cnmim][NTf2]) with different alkyl chain lengths (from C2 to C12) was investigated using transient absorption spectroscopy. The internal conversion rate from the excited state to the ground state was estimated from bleach recovery around the ground state absorption centre, and the successive vibrational cooling rate in the ground state was estimated from the decay of the hot band observed at the red-edge of ground state absorption...
August 10, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28795558/a-cheap-flexible-and-thermal-sensitive-paper-sensor-through-writing-with-ionic-liquids-containing-pencil-leads
#13
Saijun Sun, Zhilong Duan, Xun Wang, Gan Lai, Xinyue Zhang, Hao Wei, Lianhe Liu, Ning Ma
The flexible and portable paper-based sensors have a broad potential application in electronic detection and devices. In this work, a flexible thermo-responsive paper sensor was reported by written on A4 paper with composite pencil leads which contain thermo-responsive pyrene-based ionic liquid [Pyrmim]+[Br]-. The [Pyrmim]+[Br]- was transferred onto A4 paper surface with graphite by pencil writing for the facile preparation of thermal-sensitive paper chips. The as-prepared paper sensor was much sensitive to the NIR irradiation and warm objects...
August 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28795435/effect-of-carbon-supports-on-enhancing-mass-kinetic-current-density-of-fe-n-c-electrocatalysts
#14
Xinghua Chen, Fei He, Yanfei Shen, Yiran Yang, Hao Mei, Songqin Liu, Toshiyuki Mori, Yuanjian Zhang
Of note, the mass kinetic current density (mass JK) of most extensively reported M-N/C catalysts (M represents non-precious metal elements such as Fe, Co, and Cu), a potential alternative to noble metal catalyst in fuel cells, is poorer than that of commercial Pt/C. Thus, deep understanding of the intrinsic roles of carbon supports may contribute to the development of M-N/C catalysts from a practical point of view. Herein, the routinely used carbon supports, i.e. carbon black (CB) and carbon nanotubes (CNT) that have different morphology and crystallinity were investigated to uncover the factors that affected the mass JK of Fe-N/C in electrocatalytic oxygen reduction...
August 9, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28795175/x-ray-reflectivity-reveals-ionic-structure-at-liquid-crystal-aqueous-interfaces
#15
James E Hallett, Dominic W Hayward, Thomas Arnold, Paul Bartlett, Robert M Richardson
Here X-ray reflectivity has been used to determine the structure of liquid crystal monolayers for different cyanobiphenyl homologues supported on aqueous solutions of two different salt species. Sodium iodide induces homeotropic ordering for all of the monolayer forming liquid crystal homologues studied here, and forms a Stern layer of iodide ions at the liquid crystal cyano headgroup, similar to the case of lipids or surfactants supported on electrolyte solutions. The liquid crystal headgroups were also found to penetrate into the water surface when binding with iodide ions...
August 10, 2017: Soft Matter
https://www.readbyqxmd.com/read/28794956/recent-progress-on-deep-eutectic-solvents-in-biocatalysis
#16
REVIEW
Pei Xu, Gao-Wei Zheng, Min-Hua Zong, Ning Li, Wen-Yong Lou
Deep eutectic solvents (DESs) are eutectic mixtures of salts and hydrogen bond donors with melting points low enough to be used as solvents. DESs have proved to be a good alternative to traditional organic solvents and ionic liquids (ILs) in many biocatalytic processes. Apart from the benign characteristics similar to those of ILs (e.g., low volatility, low inflammability and low melting point), DESs have their unique merits of easy preparation and low cost owing to their renewable and available raw materials...
2017: Bioresources and Bioprocessing
https://www.readbyqxmd.com/read/28794317/high-resolution-kendrick-mass-defect-analysis-of-poly-ethylene-oxide-based-non-ionic-surfactants-and-their-degradation-products
#17
Thierry Fouquet, Haruo Shimada, Katsuyuki Maeno, Kanako Ito, Yuka Ozeki, Shinya Kitagawa, Hajime Ohtani, Hiroaki Sato
Matrix assisted laser desorption ionization (MALDI) high-resolution mass spectrometry (HRMS) and the recently introduced high-resolution Kendrick mass defect (HRKMD) analysis are combined to thoroughly characterize non-ionic surfactants made of a poly(ethylene oxide) (PEO) core capped by esters of fatty acids. A PEO monostearate surfactant is first analyzed as a proof of principle of the HRKMD analysis conducted with a fraction of EO as the base unit (EO/X with X being an integer) in lieu of EO for a regular KMD analysis...
August 8, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28793962/simultaneous-extraction-and-concentration-of-water-pollution-tracers-using-ionic-liquid-based-systems
#18
Teresa B V Dinis, Helena Passos, Diana L D Lima, Ana C A Sousa, João A P Coutinho, Valdemar I Esteves, Mara G Freire
Human activities are responsible for the release of innumerous substances into the aquatic environment. Some of these substances can be used as pollution tracers to identify contamination sources and to prioritize monitoring and remediation actions. Thus, their identification and quantification are of high priority. However, due to their presence in complex matrices and at significantly low concentrations, a pre-treatment/concentration step is always required. As an alternative to the currently used pre-treatment methods, mainly based on solid-phase extractions, aqueous biphasic systems (ABS) composed of ionic liquids (ILs) and K3C6H5O7 are here proposed for the simultaneous extraction and concentration of mixtures of two important pollution tracers, caffeine (CAF) and carbamazepine (CBZ)...
July 29, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28792747/the-effect-of-water-on-rheology-of-native-cellulose-ionic-liquids-solutions
#19
Behzad Nazari, Nyalaliska Utomo, Ralph H Colby
Cellulose coagulates upon adding water to its solutions in ionic liquids. Although cellulose remains in solution with much higher water contents, here we report the effect of 0-3 wt.% water on solution rheology of cellulose in 1-butyl-3-methylimidazolium chloride (BMImCl) and 1-ethyl-3-methylimidazolium acetate (EMImAc). Fourier transform infrared (FTIR) spectroscopy, thermal gravimetric analysis (TGA), and polarized light microscopy were also used to study water absorbance to the solutions. Tiny amounts of water (0...
August 9, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28792658/synthesis-of-hierarchical-porous-metals-using-ionic-liquid-based-media-as-solvent-and-template
#20
Xinchen Kang, Xiaofu Sun, Xiaoxue Ma, Pei Zhang, Zhanrong Zhang, Qinglei Meng, Buxing Han
It was found that nanodomains existed in the ionic liquid (IL)-based ternary system containing IL 1-ethyl-3-methylimidazole tetrafluoroborate (EmimBF4), IL 1-decyl-3-methylimidazole nitrate (DmimNO3) and water, and the size distribution of the domains changed continuously with the composition of the ternary solution. A strategy to synthesize hierarchical porous metals using IL-based media as solvent and template was proposed, and the hierarchical porous Ru and Pt metals formed by the assembly of metal clusters of about 1...
August 9, 2017: Angewandte Chemie
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