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https://www.readbyqxmd.com/read/27933691/single-fusion-events-at-polarized-liquid-liquid-interfaces
#1
Eduardo Laborda, Angela Molina, Vanesa Fernández Espín, Francisco Martínez-Ortiz, José García de la Torre, Richard G Compton
A new electrochemical framework for tracking individual soft particles in solution and monitoring their fusion with polarized liquid-liquid interfaces is reported. The physicochemical principle lies in the interfacial transfer of an ionic probe confined in the particles dispersed in solution and that is released upon their collision and fusion with the fluid interface. As a proof-of-concept, spike-like transients of a stochastic nature are reported in the current-time response of 1,2-dichloroethane(DCE)|water(W) submilli-interfaces after injection of DCE-in-W emulsions...
December 9, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27932083/room-temperature-ionic-liquids-based-salting-in-strategy-for-counter-current-chromatography-in-the-separation-of-arctiin
#2
Yanyan Wang, Lihong Zhang, Dingding Wang, Xiuyun Guo, Shihua Wu
Counter-current chromatography (CCC) is a solid support-free liquid-liquid partition chromatography and has wide applications. However, CCC separation is still a challenging process and the selection of appropriate solvent system for separation of target compound(s) is still relatively time-consuming. In this work, we introduced a room temperature ionic liquids-based salting-in strategy for the rapid selection of suitable solvent systems for CCC separation. In the randomly selected solvent systems, such as ethyl acetate-water, n-butanol-water, n-pentanol-water, n-hexanol-water, and n-octanol-water, several ionic liquids such as [AMIM]Cl, [MAMIM]Cl, and [BMIM]Cl can increase the solubility of the solutes in the lower phase, which made a dose-dependent decreasing of partition coefficient of solute in the two-phase solvent system...
November 30, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27931388/effects-of-pollution-on-freshwater-organisms
#3
B S Choudri, Mahad Baawain
This review includes works published in the general scientific literature during 2015 on the effects of anthropogenic pollutants on freshwater organisms. It begins with two broad sections: research reviews and broad field studies and surveys. This is followed by reviews of research categorized in sections to reflect the pollutant class. These sections include wastewater, stormwater and non-point source pollution, nutrients, sediment cap materials and suspended clays, botanical extracts, surfactants, metals, persistent organic pollutants, pharmaceuticals, endocrine disruptors, pesticides, petroleum hydrocarbons and polycyclic aromatic hydrocarbons (PAHs), ionic liquids, and nanomaterials...
October 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/27929167/nanostructure-of-the-h-terminated-p-si-111-ionic-liquid-interface-and-the-effect-of-added-lithium-salt
#4
Viktor Hoffmann, Abhishek Lahiri, Natalia Borisenko, Timo Carstens, Giridhar Pulletikurthi, Andriy Borodin, Rob Atkin, Frank Endres
Ionic liquids are potential electrolytes for safe lithium-ion batteries (LIB). Recent research has probed the use of silicon as an anode material for LIB with various electrolytes. However, the nanostructure of the ionic liquid/Si interface is unknown. The present communication probes the hydrogen terminated p-Si(111) interface using atomic force microscopy (AFM) in 1-ethyl-3-methylimidazolium bis(trifluoromethlysulfonyl)amide ([EMIm]TFSA) and 1-butyl-1-methylpyrrolidinium bis(trifluoromethlysulfonyl)amide ([Py1,4]TFSA)...
December 8, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27929161/dna-ionogel-structure-and-self-assembly
#5
Pankaj Kumar Pandey, Kamla Rawat, V K Aswal, J Kohlbrecher, H B Bohidar
DNA dissolved in ionic liquid (IL) solution (1-ethyl-3-methylimidazolium chloride, [C2mim][Cl]) showed a transition to the gel phase ([DNA] ≥ 1% (w/v)). The gelation time was 400 s for the 1% [IL] sample which reduced to 260 s for 5% [IL] concentration. Gelation times, obtained from the viscosity and ergodicity breaking from the dynamic structure factor data, were remarkably identical to each other. Correspondingly, the gelation temperature which was ∼60 °C increased to 67 °C with [IL] content. The small angle neutron scattering (SANS) structure factor profile revealed the presence of the following three distinct length scales: (a) mesh size, ξ ≈ 3 ± 0...
December 8, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27928643/effect-of-polymorphs-of-cellulose-nanocrystal-on-the-thermal-properties-of-poly-lactic-acid-cellulose-nanocrystal-composites
#6
Junchai Zhao, Yujing Zhao, Zhao Wang, Zheng Peng
Cellulose nanocrystals (CNCs) with different polymorphs CNC I and II were fabricated from native and mercerized microcrystalline cellulose (MCC) by sulfuric acid hydrolysis. CNC I and II were successfully acetylated by a "green" method, which was performed in an ionic liquid of 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF4). X-ray diffraction (XRD) proved that the crystal structure of CNC I and II was maintained after acetylation. Transmission electron microscopy (TEM) showed the rod-like structure for acetylated CNC I and spherical crystal morphologies for acetylated CNC II...
December 2016: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/27924315/control-of-selective-ion-transfer-across-liquid-liquid-interfaces-a-rectifying-heterojunction-based-on-immiscible-electrolytes
#7
Guillermo Iván Guerrero-García, Francisco J Solis, Kalyan Raidongia, Andrew Robert Koltonow, Jiaxing Huang, Mónica Olvera de la Cruz
The current rectification displayed by solid-state p-n semiconductor diodes relies on the abundance of electrons and holes near the interface between the p-n junction. In analogy to this electronic device, we propose here the construction of a purely ionic liquid-state electric rectifying heterojunction displaying an excess of monovalent cations and anions near the interface between two immiscible solvents with different dielectric properties. This system does not need any physical membrane or material barrier to show preferential ion transfer but relies on the ionic solvation energy between the two immiscible solvents...
November 23, 2016: ACS Central Science
https://www.readbyqxmd.com/read/27923764/applications-of-deep-eutectic-solvents-in-biotechnology-and-bioengineering-promises-and-challenges
#8
REVIEW
Yves Paul Mbous, Maan Hayyan, Adeeb Hayyan, Won Fen Wong, Mohd Ali Hashim, Chung Yeng Looi
Deep eutectic solvents (DESs) have been touted recently as potential alternatives to ionic liquids (ILs). Although they possess core characteristics that are similar to those of ILs (e.g., low volatility, non-flammability, low melting points, low vapor pressure, dipolar nature, chemical and thermal stability, high solubility, and tuneability), DESs are superior in terms of the availability of raw materials, the ease of storage and synthesis, and the low cost of their starting materials. As such, they have become the subject of intensive research in various sectors, notably the chemical, electrochemical, and biological sectors...
December 3, 2016: Biotechnology Advances
https://www.readbyqxmd.com/read/27922206/towards-understanding-the-solvent-dynamic-control-of-the-transport-and-heterogeneous-electron-transfer-processes-in-ionic-liquids
#9
Mohsin Ahmad Bhat, Pravin P Ingole, Hyacinthe Randriamahazaka
Impact of temperature induced solvent dynamic changes on the diffusion coefficient and standard rate constant (k0) for heterogeneous electron transfer (ET) of ethylferrocene (EFc) in 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]), was investigated. The results were analyzed to understand the impact of the solvent dynamic control, solute-solvent interactions, and solvent friction on the transport of redox probes and k0. Concentration dependency of diffusion coefficient for EFc in [BMIM][PF6] was observed...
December 6, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/27921385/-practical-electrospinning-of-biopolymers-in-ionic-liquids
#10
Julia L Shamshina, Oleksandra Zavgorodnya, Jonathan R Bonner, Gabriela Gurau, Thomas Di Nardo, Robin D Rogers
To address the need to scale up technologies for electrospinning of biopolymers from ionic liquids to practical volumes, a setup for the multi-needle electrospinning of chitin using the ionic liquid 1-ethyl-3-methylimidazolium acetate, [C2 mim]-[OAc], was designed, built, and demonstrated. Materials with controllable and high surface area were prepared at the nanoscale using ionic-liquid solutions of high-molecular-weight chitin extracted with the same ionic liquid directly from shrimp shells.
December 6, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27921332/metal-organic-framework-impregnated-with-binary-ionic-liquid-for-safe-proton-conduction-above-100-oc
#11
Xiao-Li Sun, Wei-Hua Deng, Hui Chen, Hong-Liang Han, Jared M Taylor, Chong-Qing Wan, Gang Xu
To develop proton conducting materials under low humidity condition and moderate working temperature still remains challenging for fuel-cell technology. Herein, we show a new type of proton-conducting material, EIMS-HTFSA@MIL, which was prepared by impregnating binary ionic liquids, EIMS-HTFSA, into mesoporous metal-organic framework, MIL-101. Taking advantages of the ionic liquid, such as high thermal stability, non-volatility, non-flammability and low corrosivity, EIMS-HTFSA@MIL shows potential application on proton conduction above 100 oC as a safe electrolyte...
December 5, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27920919/crystal-structure-of-di-methyl-formamidium-bis-tri-fluoro-methane-sulfon-yl-amide-an-ionic-liquid
#12
Allan Jay P Cardenas, Molly O'Hagan
At 100 K, the title mol-ecular salt, C3H8NO(+)·C2F6NO4S2(-), has ortho-rhom-bic (P212121) symmetry; the amino H atom of bis-(tri-fluoro-methane-sulfon-yl)amine (HNTf2) was transferred to the basic O atom of di-methyl-formamide (DMF) when the ionic liquid components were mixed. The structure displays an O-H⋯N hydrogen bond, which links the cation to the anion, which is reinforced by a non-conventional C-H⋯O inter-action, generating an R2(2)(7) loop. A further very weak C-H⋯O inter-action generates an [001] chain...
September 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/27918026/infrared-dynamics-study-of-thermally-treated-perfluoroimide-acid-proton-exchange-membranes
#13
L Puskar, E Ritter, U Schade, M Yandrasits, S J Hamrock, M Schaberg, E F Aziz
The temperature induced dehydration process of the 3M Brand perfluoroimide acid (PFIA), an advanced proton exchange membrane for fuel cells, was studied by in situ infrared spectroscopy to understand proton transport processes under conditions of low hydration levels. A comprehensive assignment of the vibrational bands of PFIA in the mid infrared region is provided. Investigation of the kinetics in conjunction with 2D correlation spectroscopy methods revealed the sequential process of the hydration and dehydration in a conclusive model...
December 5, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27917429/a-thermochromic-europium-iii-room-temperature-ionic-liquid-with-thermally-activated-anion-cation-interactions
#14
Bernardo Monteiro, Mani Outis, Hugo Cruz, João Paulo Leal, César A T Laia, Cláudia C L Pereira
We report the first example of an observable and reversible case of thermochromism due to the interaction of an alkylphosphonium (P6,6,6,14)(+) with a β-diketonate (1,1,1,2,2,3,3-heptafluoro-7,7-dimethyloctane-4,6-dionate-fod) of an europium(iii) tetrakis-β-diketonate room temperature ionic liquid. This thermochromism is characterized by the conversion of a light yellow viscous liquid, at room temperature, to a reddish substance close to 80 °C. The reversibility of this optical effect was highlighted by the thermal stability of the Eu(iii) complex...
December 5, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27916801/macromolecular-interactions-control-structural-and-thermal-properties-of-regenerated-tri-component-blended-films
#15
Ashley Lewis, Joshua C Waters, John Stanton, Joseph Hess, David Salas-de la Cruz
With a growing need for sustainable resources research has become highly interested in investigating the structure and physical properties of biomaterials composed of natural macromolecules. In this study, we assessed the structural, morphological, and thermal properties of blended, regenerated films comprised of cellulose, lignin, and hemicellulose (xylan) using the ionic liquid 1-allyl-3-methylimidazolium chloride (AMIMCl). Attenuated total reflectance Fourier transform infrared (ATR-FTIR) analysis, scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray scattering, and thermogravimetric analysis (TGA) were used to qualitatively and quantitatively measure bonding interactions, morphology, and thermal stability of the regenerated films...
November 28, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27916129/application-of-a-macrocyclic-compound-bambus-6-uril-in-tailor-made-liquid-membranes-for-highly-selective-electromembrane-extractions-of-inorganic-anions
#16
Andrea Šlampová, Vladimír Šindelář, Pavel Kubáň
A tailor-made liquid membrane consisting of a resistive organic solvent (nitrobenzene, NB) and a highly selective non-ionic macrocyclic compound (bambus[6]uril, BU6) was employed for electromembrane extraction (EME) of inorganic anions. BU6 facilitates strong host-guest interactions of its internal cavity with selected inorganic anions only and its presence in the liquid membrane ensured excellent selectivity of the EME process. EME transfers were directly related to association constants between BU6 and inorganic anions and nearly absolute selectivity was achieved for EMEs of iodide, bromide and perchlorate...
January 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/27915199/deep-eutectic-solvents-as-green-media-for-extraction-of-flavonoid-glycosides-and-aglycones-from-platycladi-cacumen
#17
Bo Zhuang, Li-Li Dou, Ping Li, E-Hu Liu
Deep eutectic solvents (DESs) are emerging as alternatives to conventional ionic liquids and organic solvents due to their unique advantages. In the present study, the tuneability of DESs as tailor-made solvents to efficiently extract polar and non-polar bioactive compounds from Platycladi Cacumen was detailedly investigated. Totally 12 types of choline chloride-, betaine-, and l-proline-based DESs were synthesized for initial screening, and extraction conditions was optimized by single-factor experiment. Experiments with different DESs and principal components analysis demonstrated that the extractability of both flavonoid glycosides and aglycones was greater with certain designed DESs than conventional solvents...
November 27, 2016: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/27914801/new-bithiazolyl-hydrazones-novel-synthesis-characterization-and-antitubercular-evaluation
#18
Mahendra B Bhalerao, Sambhaji T Dhumal, Amarsinh R Deshmukh, Laxman U Nawale, Vijay Khedkar, Dhiman Sarkar, Ramrao A Mane
New bithiazolyl hydrazones (6a-l) have been first time synthesized by carrying novel one pot cyclocondensation of 5-acyl thiazoles (1a-b), thiosemicarbazide (2) and substituted phenacyl chlorides (4a-f) in freshly prepared ionic liquid, diisopropyl ethyl ammonium acetate (DIPEAc) at room temperature. The newly synthesized compounds have been evaluated for their antitubercular activity and the compounds 3b, 6a, 6b, 6d, 6e, 6f, 6g, and 6l have displayed noticeable antitubercular activity compared to Rifampicin with tolerable cytotoxicity...
November 22, 2016: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/27914326/molecular-interactions-in-high-conductive-gel-electrolytes-based-on-low-molecular-weight-gelator
#19
Michał Bielejewski, Andrzej Łapiński, Oleg Demchuk
Organic ionic gel (OIG) electrolytes, also known as gel electrolytes or ionogels are one example of modern functional materials with the potential to use in wide range of electrochemical applications. The functionality of OIGs arises from the thermally reversible solidification of electrolytes or ionic liquids and their superior ionic conductivity. To understand and to predict the properties of these systems it is important to get the knowledge about the interactions on molecular level between the solid gelator matrix and the electrolyte solution...
November 16, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27912967/qualitative-analysis-of-copaifera-oleoresin-using-comprehensive-two-dimensional-gas-chromatography-and-gas-chromatography-with-classical-and-cold-electron-ionisation-mass-spectrometry
#20
Yong Foo Wong, Thais M Uekane, Claudia M Rezende, Humberto R Bizzo, Philip J Marriott
Improved separation of both sesquiterpenes and diterpenic acids in Copaifera multijuga Hayne oleoresin, is demonstrated by using comprehensive two-dimensional gas chromatography (GC×GC) coupled to accurate mass time-of-flight mass spectrometry (accTOFMS). GC×GC separation employs polar phases (including ionic liquid phases) as the first dimension ((1)D) column, combined with a lower polarity (2)D phase. Elution temperatures (Te) of diterpenic acids (in methyl ester form, DAME) increased as the (1)D McReynolds' polarity value of the column phase decreased...
November 22, 2016: Journal of Chromatography. A
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