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https://www.readbyqxmd.com/read/28551136/synthesis-of-conductive-polymeric-ionic-liquid-ni-nanocomposite-and-its-application-to-construct-a-nanostructure-based-electrochemical-sensor-for-determination-of-warfarin-in-the-presence-of-tramadol
#1
Elaheh Molaakbari, Ali Mostafavi, Hadi Beitollahi, Zeinab Tohidiyan
In the current study, poly(MImEO8BS)-Ni nanocomposite was synthesized and applied to modify a glassy carbon electrode along with conductive polymeric ionic liquids. The electrochemical investigation of the modified electrode as well as its efficiency for voltammetric oxidation of warfarin is elucidated. The electrode was used to study the voltammetric oxidation of warfarin by employing cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry, and square wave voltammetry (SWV) as diagnostic techniques...
August 15, 2017: Talanta
https://www.readbyqxmd.com/read/28550747/investigation-of-solvation-of-iron-nanoclusters-in-ionic-liquid-1-butyl-1-1-1-trimethylammonium-methane-sulfonate-using-molecular-dynamics-simulations-effect-of-cluster-size-at-different-temperatures
#2
Mohsen Abbaspour, Hamed Akbarzadeh, Parnian Yousefi, Mohammad Razmkhah
The systems composed of metal nanoclusters in ionic liquids are relevant for applications in lubrication, electrochemical devices, catalysis, and chemical processes. The mechanism of solvation and interactions of these systems are not understood at present. In this work, we have simulated iron nanoclusters with different sizes in ionic liquid 1-butyl-1,1,1-trimethylammonium methane sulfonate [N1114][C1SO3] at two temperatures (300 and 500K) and at atmospheric pressure. We have investigated the effects of cluster size and the temperature on some of the thermodynamics, structural and dynamical properties of the systems...
May 21, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28549907/transformation-of-bcs-class-i-and-iii-drugs-into-ionic-liquids-and-lipophilic-salts-for-enhanced-developability-using-lipid-formulations
#3
Hywel D Williams, Leigh Ford, Shea Lim, Sifei Han, John Baumann, Hannah Sullivan, David Vodak, Annabel Igonin, Hassan Benameur, Colin W Pouton, Peter J Scammells, Christopher J H Porter
Higher lipid solubility of lipophilic salt forms creates new product development opportunities for high-dose liquid-filled capsules. The purpose of this study was to determine if lipophilic salts of BCS Class I amlodipine and BCS Class III fexofenadine, ranitidine and metformin were better lipid formulation candidates than existing commercial salts. Lipophilic salts were prepared from lipophilic anions and commercial HCl or besylate salt forms, as verified by (1)H NMR. Thermal properties were assessed by DSC and hot-stage microscopy...
May 23, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28548148/diverse-configurations-of-columnar-liquid-crystals-in-cylindrical-nano-and-micropores
#4
Rui-Bin Zhang, Goran Ungar, Xiangbing Zeng, Zhihao Shen
Using 2D X-ray diffraction and AFM we studied the configuration, in cylindrical confinement, of hexagonal columnar phases that anchor homeotropically, i.e. with the columns normal to the pore wall. A wide range of pore diameters, from 20 nm to 100 μm, were explored by employing anodic alumina membranes and glass capillaries. The compounds used were a small discotic, hexakis(hexyloxy)triphenylene (HAT6), a large discotic hexa-peri-hexabenzocoronene (HBC), and a T-shaped bolaamphiphile, forming a honeycomb-type columnar phase...
May 26, 2017: Soft Matter
https://www.readbyqxmd.com/read/28547989/preservation-of-dna-nanostructure-carriers-effects-of-freeze-thawing-and-ionic-strength-during-lyophilization-and-storage
#5
Bing Zhu, Yan Zhao, Jiangbing Dai, Jianbang Wang, Shu Xing, Linjie Guo, Nan Chen, Xiangmeng Qu, Li Li, Juwen Shen, Jiye Shi, Jiang Li, Lihua Wang
DNA nanostructures have attracted wide interest in biomedical applications, especially as nanocarriers for drug delivery. Therefore, it is important to ensure the structural integrity of DNA nanostructures under ambient temperature storage. In this study, we examined lyophilization-based preservation of DNA nanostructures by investigating the structural integrity of different DNA nanostructures reconstituted from lyophilization. We demonstrated that lyophilization under appropriate ionic strength is amenable to the storage of DNA nanostructures...
May 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28547888/mapping-the-free-energy-of-lithium-solvation-in-the-protic-ionic-liquid-ethylammonuim-nitrate-a-metadynamics-study
#6
Ali Kachmar, Marcelo Carignano, Teodoro Laino, Marcella Iannuzzi, Jürg Hutter
The understanding of lithium solvation and transport in ionic liquids is important due to the possible applications in electrochemical devices. Using first principles simulations aided with the metadynamics approach we study the free energy landscape for lithium at infinite dilution conditions in ethylammonium nitrate, a protic ionic liquid. We analyze the local structure of the liquid around the lithium cation and find a quantitative picture in agreement with experimental findings. Our simulations show that the lowest two free energy minima correspond to conformations with the lithium solvated either by 3 or 4 nitrates ions with a transition barrier between them of 0...
May 26, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28544915/pyrrole-based-poly-ionic-liquids-as-efficient-stabilizers-for-formation-of-hollow-multi-walled-carbon-nanotubes-particles
#7
Prithwish Chatterjee, Elizabeth M Nofen, Wenwen Xu, Conrad Hom, Hanqing Jiang, Lenore L Dai
Poly(ionic liquid) (PIL) derivatives with pyrrole intrinsically conducting polymer (ICP) backbones were synthesized and utilized as novel dispersants of multi-walled carbon nanotubes (MWCNTs) in various aqueous and non-aqueous systems, including polar and nonpolar solvents. This is due to the highly tunable nature of the PIL, in which the PILs of varying polarity with the same pyrrole-based polycation can be synthesized. The dispersions are exceedingly stable over many months, and with the addition of hexane, Pickering (solid-stabilized) emulsions with the PIL-stabilized MWCNTs at the droplet interfaces were formed...
April 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28544020/porous-poly-ionic-liquid-membranes-as-efficient-and-recyclable-absorbents-for-heavy-metal-ions
#8
Yongyuan Ren, Jiandong Zhang, Jiangna Guo, Fei Chen, Feng Yan
Heavy metal ion pollution has become a serious environmental problem. Herein, this study reports the synthesis of poly(ionic liquid) (PIL) membranes via in situ photo-crosslinking of vinyl imidazole with both hydrophilic and hydrophobic ionic liquid monomers. The resultant amphiphilic polymer membranes are porous and exhibit high absorption capacity of metal ions (including Hg(2+) , Pb(2+) , Cu(2+) , Cd(2+) , and Zn(2+) ) in both high (1000 mg L(-1) ) and low (10 mg L(-1) ) concentration metal ion solutions...
May 22, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28543683/photo-responsive-soft-ionic-crystals-ion-pairing-assemblies-of-azobenzene-carboxylates
#9
Ryohei Yamakado, Mitsuo Hara, Shusaku Nagano, Takahiro Seki, Hiromitsu Maeda
This report delineates the design and synthesis of negatively charged azobenzene derivatives that form photo-responsive ion-pairing assemblies. The azobenzene carboxylates possessing aliphatic chains were prepared as photo-responsive anions that promote the formation of ion-pairing dimension-controlled assemblies, including mesophases, when used in conjunction with a tetrabutylammonium (TBA) cation. The photo-responsive properties of the ion pairs and the precursory carboxylic acids in the bulk state were examined by POM and XRD, demonstrating that liquid crystal (LC)-liquid and crystal-liquid phase transitions occurred depending on the number and lengths of the aliphatic chains of each assembly...
May 23, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28540952/investigating-the-effect-of-ionic-strength-on-the-suppression-of-dendrite-formation-during-metal-electrodeposition
#10
Andrew K Pearson, Pon Kao, Anthony P O'Mullane, Anand I Bhatt
The effect of ionic strength on the electrodeposition of silver has been investigated in acetonitrile (MeCN) containing TBAPF6 or in the ionic liquid [EMIm][OTf]. The use of an ionic liquid allows a greater ionic strength to be investigated as the solubility limits of supporting electrolytes in organic solvents can be overcome using neat ionic liquid. The SEM and XRD data show that polycrystalline silver is deposited in a fcc structure and that dendrite formation is retarded at high ionic strength. Electrochemical measurements undertaken in electrolytes of low ionic strength indicate that the deposition and growth of a few nuclei is preferred and leads to dendrite formation...
May 25, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28540379/fundamental-aspects-of-electrochemically-controlled-wetting-of-nanoscale-composite-materials
#11
A Robert Hillman, Karl S Ryder, Hani K Ismail, Asuman Unal, Annelies Voorhaar
Electroactive films based on conducting polymers have numerous potential applications, but practical devices frequently require a combination of properties not met by a single component. This has prompted an extension to composite materials, notably those in which particulates are immobilised within a polymer film. Irrespective of the polymer and the intended application, film wetting is important: by various means, it facilitates transport processes - of electronic charge, charge-balancing counter ions ("dopant") and analyte/reactant molecules - and motion of polymer segments...
May 25, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28537731/reaction-of-spring-barley-and-common-radish-on-the-introduction-of-ionic-liquids-containing-asymmetric-cations-to-the-soil
#12
Barbara Pawłowska, Arkadiusz Telesiński, Maciej Płatkowski, Michał Stręk, Martyna Śnioszek, Robert Biczak
The harmful effect of ionic liquids (ILs) on the environment is one of the important elements of scientific research conducted around the world. This study presents the effect of ionic liquids, containing the asymmetric cations benzyltrimethylammonium chloride [BenzTMA][Cl] and benzyltriethylammonium chloride[BenzTEA][Cl], on physiological and biochemical changes in common radish plants and spring barley seedlings. The examined ILs demonstrated low toxicity to higher plants. A compound that exhibiting higher phytotoxicity to these plant species was [BenzTMA][Cl]...
May 24, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28537605/factors-affecting-bubble-size-in-ionic-liquids
#13
Sarah F R Taylor, Stuart A Brittle, Pratik Desai, Johan Jacquemin, Christopher Hardacre, William A Zimmerman
This study reports on understanding the formation of bubbles in ionic liquids (ILs), with a view to utilising ILs more efficiently in gas capture processes. In particular, the impact of the IL structure on the bubble sizes obtained has been determined in order to obtain design principles for the ionic liquids utilised. 11 ILs were used in this study with a range of physico-chemical properties in order to determine parametrically the impact on bubble size due to the liquid properties and chemical moieties present...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28535878/newest-applications-of-molecularly-imprinted-polymers-for-extraction-of-contaminants-from-environmental-and-food-matrices-a-review
#14
REVIEW
Andrea Speltini, Andrea Scalabrini, Federica Maraschi, Michela Sturini, Antonella Profumo
This paper presents an overview of the recent applications of molecularly imprinted polymers (MIPs) to sample preparation. The review is thought to cover analytical procedures for extraction of contaminants (mainly illegal/noxious organic compounds) from food and environmental matrices, with a particular focus on the various pre-concentration/cleanup techniques, that is offline and online solid-phase extraction (SPE), dispersive SPE (d-SPE), magnetic SPE (MSPE), solid-phase microextraction (SPME) and stir-bar sorptive extraction (SBSE), applied before instrumental quantification...
June 29, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28535681/introduction-ionic-liquids
#15
Zhigang Lei, Biaohua Chen, Yoon-Mo Koo, Douglas R MacFarlane
No abstract text is available yet for this article.
May 24, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28535680/catalytic-transformation-of-lignocellulose-into-chemicals-and-fuel-products-in-ionic-liquids
#16
Zhanrong Zhang, Jinliang Song, Buxing Han
Innovative valorization of naturally abundant and renewable lignocellulosic biomass is of great importance in the pursuit of a sustainable future and biobased economy. Ionic liquids (ILs) as an important kind of green solvents and functional fluids have attracted significant attention for the catalytic transformation of lignocellulosic feedstocks into a diverse range of products. Taking advantage of some unique properties of ILs with different functions, the catalytic transformation processes can be carried out more efficiently and potentially with lower environmental impacts...
May 24, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28535055/ionic-liquid-anion-controlled-nanoscale-gold-morphology-grown-at-a-liquid-interface
#17
Nakara Bhawawet, Jeremy B Essner, Durgesh Vinod Wagle, Gary A Baker
Two different ionic liquids comprising the tetrabutylphosphonium cation ([P4444]) paired with the strongly-coordinating anions 6-aminocaproate ([6-AC]) or taurinate ([tau]) were prepared and employed in an aqueous/organic liquid bilayer system to generate nanoscale gold by Au(OH)4- photoreduction. Generally, as the concentration of ionic liquid in the organic phase was increased, the resulting quasi-spherical gold nanoparticles reduced in size and presented less aggregation, leading to marked increases in the catalytic efficiency for 4-nitrophenol reduction using borohydride...
May 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28535053/the-origin-of-ion-pairing-and-redissociation-of-ionic-liquid
#18
Bong-Seop Lee, Shiang-Tai Lin
We address the possible occurrence of a minimum extent of dissociation (α) of ionic liquid (IL) in IL-solvent mixtures. This phenomenon, known as the re-dissociation of IL, is responsible for many interesting composition-dependent properties in such mixtures. A predictive thermodynamic model is developed to provide semi-quantitative description on the change of α with solvent concentration. It is found that the occurrence of minimum α coincides with the occurrence maximum mean activity coefficient of dissociated ions, indicating better solvation of free, dissociated ions both with decreasing and increasing solvent concentration...
May 23, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28534923/divergent-syntheses-of-iodinated-isobenzofuranones-and-isochromenones-by-iodolactonization-of-2-alkynylbenzoic-acids-in-ionic-liquids
#19
Raffaella Mancuso, Christian C Pomelli, Francesco Malafronte, Asif Maner, Nadia Marino, Cinzia Chiappe, Bartolo Gabriele
The regiochemical outcome of the iodolactonization of 2-alkynylbenzoic acids, carried out at 100 °C in ionic liquids (ILs) as unconventional solvents and with molecular iodine as the iodine source, in the absence of external bases, was found to be strongly dependent on the nature of the IL medium. In particular, while the use of N-ethyl-N-methylmorpholinium dicyanamide (Mor1,2N(CN)2) promoted the stereoselective formation of (E)-3-(iodomethylene)isobenzofuran-1(3H)-ones, through an anti-5-exo-dig cyclization route, the use of 1-ethyl-3-methylimidazolium ethyl sulfate (EmimEtSO4) tended to favor the 6-endo-dig cyclization mode, with preferential or selective formation of 4-iodo-1H-isochromen-1-ones...
May 23, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28534614/functional-nanoclay-suspension-for-printing-then-solidification-of-liquid-materials
#20
Yifei Jin, Ashley M Compaan, Wenxuan Chai, Yong Huang
Additive manufacturing (AM) enables the freeform fabrication of complex structures from various build materials. The objective of this study is to develop a novel Laponite nanoclay-enabled "printing-then-solidification" additive manufacturing approach to extrude complex three-dimensional (3D) structures made of various liquid build materials. Laponite, a member of the smectite mineral family, is investigated to serve as a yield-stress support bath material for the extrusion printing of liquid build materials...
May 23, 2017: ACS Applied Materials & Interfaces
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