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Ionic liquid

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https://www.readbyqxmd.com/read/28346785/infrared-spectroscopy-of-ionic-liquids-consisting-of-imidazolium-cations-with-different-alkyl-chain-lengths-and-various-halogen-or-molecular-anions-with-and-without-a-small-amount-of-water
#1
Toshiki Yamada, Yukihiro Tominari, Shukichi Tanaka, Maya Mizuno
Infrared spectroscopy was performed on ionic liquids (ILs) that had imidazolium cations with different alkyl chain lengths and various halogen or molecular anions with and without a small amount of water. The molar concentration normalized absorbance due to +C-H vibrational modes in the range of 3000 to 3200 cm-1 was nearly identical for ILs that had imidazolium cations with different alkyl chain lengths and the same anions. A close correlation was found between the red-shifted +C-H vibrational modes, the chemical shift of +C(2)-H proton, and the energy stabilization of hydrogen-bonding interaction...
March 27, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28346432/nanoscale-capillary-freezing-of-ionic-liquids-confined-between-metallic-interfaces-and-the-role-of-electronic-screening
#2
Jean Comtet, Antoine Niguès, Vojtech Kaiser, Benoit Coasne, Lydéric Bocquet, Alessandro Siria
Room-temperature ionic liquids (RTILs) are new materials with fundamental importance for energy storage and active lubrication. They are unusual liquids, which challenge the classical frameworks of electrolytes, whose behaviour at electrified interfaces remains elusive, with exotic responses relevant to their electrochemical activity. Using tuning-fork-based atomic force microscope nanorheological measurements, we explore here the properties of confined RTILs, unveiling a dramatic change of the RTIL towards a solid-like phase below a threshold thickness, pointing to capillary freezing in confinement...
March 27, 2017: Nature Materials
https://www.readbyqxmd.com/read/28344647/ternary-ionic-liquid-water-pretreatment-systems-of-an-agave-bagasse-and-municipal-solid-waste-blend
#3
Jose A Perez-Pimienta, Noppadon Sathitsuksanoh, Vicki S Thompson, Kim Tran, Teresa Ponce-Noyola, Vitalie Stavila, Seema Singh, Blake A Simmons
BACKGROUND: Pretreatment is necessary to reduce biomass recalcitrance and enhance the efficiency of enzymatic saccharification for biofuel production. Ionic liquid (IL) pretreatment has gained a significant interest as a pretreatment process that can reduce cellulose crystallinity and remove lignin, key factors that govern enzyme accessibility. There are several challenges that need to be addressed for IL pretreatment to become viable for commercialization, including IL cost and recyclability...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28343686/analysis-of-essential-oils-and-fragrances-with-a-new-generation-of-highly-inert-gas-chromatographic-columns-coated-with-ionic-liquids
#4
Cecilia Cagliero, Carlo Bicchi, Chiara Cordero, Erica Liberto, Patrizia Rubiolo, Barbara Sgorbini
In the fields of essential oils and fragrances, samples often consist of mixtures of compounds with similar structural and physical characteristics (e.g. mono- and sesquiterpenoids), whose correct identification closely depends on the synergic combination of chromatographic and mass spectral data. This sample complexity means that new GC stationary phases with different selectivities are continually being investigated. Ionic liquids (ILs) are of great interest as GC stationary phases in this field because of their selectivity (significantly different than that of currently phases) and their high temperature stability...
March 18, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28342356/heterogeneous-oxidative-desulfurization-of-diesel-fuel-catalyzed-by-mesoporous-polyoxometallate-based-polymeric-hybrid
#5
Huawei Yang, Bin Jiang, Yongli Sun, Luhong Zhang, Zhaohe Huang, Zhaoning Sun, Na Yang
In this work, the simple preparation of novel polymer supported polyoxometallates (POMs) catalysts has been reported. Soluble task-specific cross-linked poly (ionic liquid) (PIL) was prepared with N,​N-​dimethyl-​dodecyl-​(4-​vinylbenzyl) ammonium chloride and divinylbenzene as co-monomers. The as-prepared cationic PILs were assembled with different commercial POMs to form the interlinked mesoporous catalysts, and the formation mechanism was provided. The catalytic oxidation activities of the catalysts were closely related to the formation pathway of their corresponding peroxide active species...
March 10, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28342099/optimized-decellularization-protocol-including-%C3%AE-gal-epitope-reduction-for-fabrication-of-an-acellular-porcine-annulus-fibrosus-scaffold
#6
Lien-Chen Wu, Yi-Jie Kuo, Fu-Wen Sun, Chia-Hsien Chen, Chang-Jung Chiang, Pei-Wei Weng, Yang-Hwei Tsuang, Yi-You Huang
Recent advances in tissue engineering have led to potential new strategies, especially decellularization protocols from natural tissues, for the repair, replacement, and regeneration of intervertebral discs. This study aimed to validate our previously reported method for the decellularization of annulus fibrosus (AF) tissue and to quantify potentially antigenic α-Gal epitopes in the decellularized tissue. Porcine AF tissue was decellularized using different freeze-thaw temperatures, chemical detergents, and incubation times in order to determine the optimal method for cell removal...
March 24, 2017: Cell and Tissue Banking
https://www.readbyqxmd.com/read/28340720/headspace-single-drop-microextraction-versus-dispersive-liquid-liquid-microextraction-using-magnetic-ionic-liquid-extraction-solvents
#7
Jiwoo An, Kira L Rahn, Jared L Anderson
A headspace single drop microextraction (HS-SDME) method and a dispersive liquid-liquid microextraction (DLLME) method were developed using two tetrachloromanganate ([MnCl4(2-)])-based magnetic ionic liquids (MIL) as extraction solvents for the determination of twelve aromatic compounds, including four polyaromatic hydrocarbons, by reversed phase high-performance liquid chromatography (HPLC). The analytical performance of the developed HS-SDME method was compared to the DLLME approach employing the same MILs...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28339192/a-novel-exposure-system-termed-navetta-for-in-vitro-laminar-flow-electrodeposition-of-nanoaerosol-and-evaluation-of-immune-effects-in-human-lung-reporter-cells
#8
Evelien Frijns, Sandra Verstraelen, Linda Corinna Stoehr, Jo van Laer, An Jacobs, Jan Peters, Kristof Tirez, Matthew Boyles, Mark Geppert, Pierre Madl, Inge Nelissen, Albert Duschl, Martin Himly
A new prototype air-liquid interface (ALI) exposure system, a flatbed aerosol exposure chamber termed NAVETTA, was developed to investigate deposition of engineered nanoparticles (NPs) on cultured human lung A549 cells directly from the gas phase. This device mimics human lung cell exposure to NPs due to a low horizontal gas flow combined with cells exposed at the ALI. Electrostatic field assistance is applied to improve NP deposition efficiency. As proof-of-principle, cell viability and immune responses after short-term exposure to nano-copper oxide (CuO)-aerosol were determined...
March 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28337908/detection-of-2-4-6-trinitrotoluene-using-a-miniaturized-disposable-electrochemical-sensor-with-an-ionic-liquid-gel-polymer-electrolyte-film
#9
Holly A Yu, Junqiao Lee, Simon W Lewis, Debbie Sue Silvester
A new electrochemical method to detect and quantify the explosive compound 2,4,6-trinitrotoluene (TNT) in aqueous solutions is demonstrated. A disposable thin-film electrode modified with a droplet of a gel-polymer electrolyte (GPE) was immersed directly into samples of TNT at concentrations of 1-10 μg/mL. The GPE contained the hydrophobic room temperature ionic liquid (RTIL) trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)imide ([P14,6,6,6][NTf2]) and the polymer poly(hexyl methacrylate) (PHMA)...
March 24, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28335972/ultrasound-assisted-ionic-liquid-based-micellar-extraction-combined-with-microcrystalline-cellulose-as-sorbent-in-dispersive-microextraction-for-the-determination-of-phenolic-compounds-in-propolis
#10
Jun Cao, Li-Qing Peng, Li-Jing Du, Qi-Dong Zhang, Jing-Jing Xu
An ionic liquid-(IL) based micellar extraction combined with microcrystalline cellulose- (MCC) assisted dispersive micro solid-phase extraction method was developed to extract phenolic compounds from propolis. A total of 20 target compounds were identified by ultra-high- performance liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry. The main extraction parameters were optimized and included the ultrasonic power, ultrasonic time, sample pH, type of IL, the concentration of [C12mim]Br, extraction time, concentration of MCC, type of sorbent and type of elution solvents...
April 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28335969/design-synthesis-and-application-of-a-new-class-of-stimuli-responsive-separation-materials
#11
Roshanak Sepehrifar, Reinhard I Boysen, Basil Danylec, Yuanzhong Yang, Kei Saito, Milton T W Hearn
A new class of efficient stationary phase has been investigated for use in the liquid chromatographic separation of low molecular weight analytes and high molecular weight biomolecules, based on the application of immobilised stimuli-responsive polymers (SRPs). To this end, two polymeric units, namely poly(2-dimethylaminoethyl methacrylate) (PDMAEMA) and poly(acrylic acid) (PAA) were tethered to a triazine core. The derived poly(2-dimethyl-aminoethyl methacrylate)-block-poly(acrylic acid) (PDMAEMA-b-PAA), as a diblock co-polymer, was then immobilised onto the surface of porous silica particles...
April 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28335528/pretreatment-of-lignocellulosic-biomass-with-ionic-liquids-and-ionic-liquid-based-solvent-systems
#12
REVIEW
Qidong Hou, Meiting Ju, Weizun Li, Le Liu, Yu Chen, Qian Yang
Pretreatment is very important for the efficient production of value-added products from lignocellulosic biomass. However, traditional pretreatment methods have several disadvantages, including low efficiency and high pollution. This article gives an overview on the applications of ionic liquids (ILs) and IL-based solvent systems in the pretreatment of lignocellulosic biomass. It is divided into three parts: the first deals with the dissolution of biomass in ILs and IL-based solvent systems; the second focuses on the fractionation of biomass using ILs and IL-based solvent systems as solvents; the third emphasizes the enzymatic saccharification of biomass after pretreatment with ILs and IL-based solvent systems...
March 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28335341/design-and-electrochemical-study-of-platinum-based-nanomaterials-for-sensitive-detection-of-nitric-oxide-in-biomedical-applications
#13
REVIEW
Maduraiveeran Govindhan, Zhonggang Liu, Aicheng Chen
The extensive physiological and regulatory roles of nitric oxide (NO) have spurred the development of NO sensors, which are of critical importance in neuroscience and various medical applications. The development of electrochemical NO sensors is of significant importance, and has garnered a tremendous amount of attention due to their high sensitivity and selectivity, rapid response, low cost, miniaturization, and the possibility of real-time monitoring. Nanostructured platinum (Pt)-based materials have attracted considerable interest regarding their use in the design of electrochemical sensors for the detection of NO, due to their unique properties and the potential for new and innovative applications...
November 14, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28333440/high-packing-density-unidirectional-arrays-of-vertically-aligned-graphene-with-enhanced-areal-capacitance-for-high-power-micro-supercapacitors
#14
Shuanghao Zheng, Zhilin Li, Zhong-Shuai Wu, Yanfeng Dong, Feng Zhou, Sen Wang, Qiang Fu, Chenglin Sun, Liwei Guo, Xinhe Bao
Interfacial integration of the shape-engineered electrode with strongly bonded current collector is the key for minimizing both ionic and electronic resistance, and then developing high-power supercapacitors. Herein, we demonstrated the construction of high-power micro-supercapacitors (VG-MSCs) based on high-density unidirectional arrays of vertically aligned graphene (VG) nanosheets, derived from thermally decomposed SiC substrate. The as-grown VG arrays showed a standing basal plane orientation grown on (0001(-)) SiC substrate, tailored thickness (3...
March 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28333432/ald-alumina-passivated-silicon-nanowires-probing-the-transition-from-electrochemical-double-layer-capacitor-to-electrolytic-capacitors
#15
Dorian Gaboriau, Maxime Boniface, Anthony Valero, Dmitry Aldakov, Thierry Brousse, Pascal Gentile, Said Sadki
Silicon nanowires were coated by a 1-5 nm thin alumina layer by Atomic Layer Deposition in order to replace poorly reproducible and unstable native silicon oxide by a highly conformal passivating alumina layer. The surface coating enabled probing the behavior of symmetric devices using such electrodes in EMI-TFSI electrolyte, allowing to attain a large cell voltage up to 6 V in ionic liquid, together with very high cyclability with less than 4% capacitance fade after 106 charge/discharge cycles. These results yielded fruitful insights on the transition between an electrochemical double-layer capacitor behavior and an electrolytic capacitor behavior...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28332847/phase-behavior-and-physical-properties-of-new-biobased-ionic-liquid-crystals
#16
Ariel Antonio Campos Toledo Hijo, Guilherme José Maximo, Mariana Conceição Costa, Rosiane Lopes Cunha, Jorge Fernando Brandão Pereira, Kiki Adi Kurnia, Eduardo A Caldas Batista, Antonio J A Meirelles
Protic ionic liquids (PILs) have emerged as promising compounds and attracted the interest of the industry and the academy community, due to their easy preparation and unique properties. In the context of green chemistry, the use of biocompounds, such as fatty acids for their synthesis could disclose a possible alternative way to produce ILs with low or non-toxic effect and consequently, expanding their applicability in bio-based processes or in the development of bioproducts. This work addressed efforts to a better comprehension of the complex Solid-Liquid-Crystal-Liquid thermodynamic equilibrium of twenty new PILs synthesized by using fatty acids commonly found in vegetable oils, as well as their rheological profile and self-assembling ability...
March 23, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28332828/garnet-type-fast-li-ion-conductors-with-high-ionic-conductivities-for-all-solid-state-batteries
#17
Jian-Fang Wu, Wei Kong Pang, Vanessa K Peterson, Lu Wei, Xin Guo
All-solid-state Li-ion batteries with metallic Li anodes and solid electrolytes could offer superior energy density and safety over conventional Li-ion batteries. However, compared with organic liquid electrolytes, the low conductivity of solid electrolytes and large electrolyte/electrode interfacial resistance impede their practical application. Garnet-type Li-ion conducting oxides are amongst the most promising electrolytes for all-solid-state Li-ion batteries. In this work, the large radius Rb is doped at the La site of cubic Li6...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28332814/hydrofluoric-acid-free-electroless-deposition-of-metals-on-silicon-in-ionic-liquids-and-its-enhanced-performance-in-lithium-storage
#18
Abhishek Lahiri, Tianqi Lu, Niklas Behrens, Natalia Borisenko, Guozhu Li, Frank Endres
Metal nanoparticles such as Au, Ag, Pt, and so forth have been deposited on silicon by electroless deposition in the presence of hydrofluoric acid (HF) for applications such as oxygen reduction reaction, surface-enhanced Raman spectroscopy, as well as for lithium ion batteries. Here, we show an HF-free process wherein metals such as Sb and Ag could be deposited onto electrodeposited silicon in ionic liquids. We further show that, compared to electrodeposited silicon, Sb-modified Si demonstrates a better performance for lithium storage...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28332659/hydration-controlled-anisotropic-and-giant-permittivity-in-teg-functionalized-eumelanin
#19
Marianna Ambrico, Paolo F Ambrico, Teresa Ligonzo, Antonio Cardone, Maria Grazia Bridelli, Giuseppe Casamassima, Paola Manini, Marco d'Ischia
Although it has long been known that the peculiar electronic-ionic conductor behavior of eumelanin is critically dependent on hydration, the detailed mechanisms by which water-polymer interactions control and affect the conduction properties have remained largely obscure. In this paper, we report a remarkable anisotropy and giant polarization effect in a synthetic eumelanin (TEGMe) chemically functionalized with hydrophilic TEG residues. FT-IR analyses of water sorption isotherms and AC measurements were consistent with a microporous structure binding or hosting mainly isolated water molecules...
March 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28330266/biosorption-of-lead-copper-and-cadmium-using-the-extracellular-polysaccharides-eps-of-bacillus-sp-from-solar-salterns
#20
Syed Shameer
Extracellular Polysaccharides (EPS) from both prokaryotes and eukaryotes have a great deal of research interest as they protect the producer from different stresses including antibiotics, ionic stress, desiccation and assist in bio-film formation, pathogenesis, adhesion, etc. In this study haloalkaliphilic Bacillus sp., known to cope with osmophilic stress, was selected and screened for EPS production. The EPS were isolated, partially purified and chemical characteristics were documented using liquid FT-IR followed by assessment of heavy metal biosorption (lead, copper and cadmium) using Atomic Absorption Spectroscopy (AAS)...
December 2016: 3 Biotech
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