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https://www.readbyqxmd.com/read/29775317/a-combined-sfg-and-thin-liquid-film-study-of-the-specific-effect-of-monovalent-cations-on-interfacial-water-structure
#1
Afshin Asadzadeh Shahir, Khristo Khristov, Khoi Tan Nguyen, Anh V Nguyen, Elena D Mileva
Some salts have been recently shown to decrease the SFG (sum frequency generation spectroscopy) intensity of the hydrogen-bonded water molecules, but a quantitative explanation is still awaited. Here we report a similar trend for the chloride salts of monovalent cations, i.e., LiCl, NaCl, and CsCl, at low concentrations. Specifically, we revealed not only the specific adsorption of cations at the water surface but also the concentration-dependent effect of ions on the SFG response of the interfacial water molecules...
May 18, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29774331/heterobimetallic-triple-decker-complexes-derived-from-a-dianionic-aromatic-stannole-ligand
#2
Masaichi Saito, Naoki Matsunaga, Jumpei Hamada, Shunsuke Furukawa, Mao Minoura, Susann Wegner, Juri Barthel, Christoph Janiak
A neutral heterobimetallic triple-decker stannole complex was prepared by the reaction of an anionic ruthenocene bearing a stannole dianionic ligand with [Rh(cod)Cl]2 (cod = 1,5-cyclooctadiene), and the resulting Ru-Rh complex exhibits an electronic property different from those of the corresponding Ru-Ru and Rh-Rh complexes. The Ru-Rh complex can be decomposed in ionic liquids to metal nanoparticles.
May 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29773396/synthesis-of-xylan-carbonates-an-approach-towards-reactive-polysaccharide-derivatives-showing-self-assembling-into-nanoparticles
#3
Martin Gericke, Lars Gabriel, Katja Geitel, Stefan Benndorf, Poonam Trivedi, Pedro Fardim, Thomas Heinze
Xylan phenyl carbonate (XPC) derivatives were prepared and characterized comprehensively. By conversion of xylan with phenyl chloroformate either in dipolar aprotic solvents with LiCl or in an ionic liquid, XPC with degrees of substitution (DS) of up to 2.0, i.e., fully functionalized derivatives, could be obtained. The synthesis was studied with respect to the influence of different reaction parameters. It was found that the reaction medium as well as the type of starting xylan strongly affected the efficiency of the derivatization...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773383/superabsorbent-nanocomposite-from-sugarcane-bagasse-chitin-and-clay-synthesis-characterization-and-swelling-behaviour
#4
Maya Sharma, Anjali Bajpai
A nanocomposite comprising crosslinked hybrid polymer network was prepared using chitin and sugarcane bagasse in presence of montmorillonite clay. Chitin and sugarcane bagasse were micro-fibrillated by ultrasonication of their suspension in an ionic liquid 2-hydroxy ethylammonium formate. Optimum reaction conditions were established by variation of amounts of initiator, monomer and crosslinker, and microwave irradiation to obtain nanocomposite with swelling degree above 1000% in 24 h. Slow and steady swelling was observed and the sample swelled to about 15,000% to form a hydrogel in 15 days...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29772391/development-of-ionic-liquid-assisted-synthesized-nano%C3%A2-silver-combined-with-vascular-endothelial-growth-factor-as-wound-healing-in-the-care-of-femoral-fracture-in-the-children-after-surgery
#5
Xingli Li, Maohua Liu, Hongxia Cheng, Qun Wang, Chuanna Miao, Shumei Ju, Fang Liu
This investigation aimed to develop the silver (Ag) nanoparticles incorporated vascular endothelial growth factor (VEGF) for the improvement wound healing and reduce Aseptic necrosis in treatment of femoral fracture healing. The spherical shaped Ag nanoparticles with improved morphology have been effectively synthesized via microwave assisted method using ionic liquids 1-dodecyl-3-methylimidazolium chloride. The morphological structure and crystalline properties of Ag nanoparticles are analyzed by using UV, XRD and TEM-EDX analytical methods...
March 6, 2018: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29771431/study-of-molecular-mechanisms-of-learning-and-memory-impairment-in-neonatal-rats-post-intrauterine-distress-via-the-pathway-of-tau-protein-hyperphosphorylation
#6
X-S Wang, H Huang
OBJECTIVE: To explore the reversion of the excitatory amino acid receptor antagonists against the impairment of learning-memory and the hyperphosphorylation of protein Tau induced by fetal intrauterine distress in neonatal rats. MATERIALS AND METHODS: The analysis of variance of factorial design set up two intervention factors, fetal intrauterine distress (two levels: no fetal intrauterine distress and a course of fetal intrauterine distress) and the excitatory amino acid receptor antagonists (three levels: Saline; NMDA receptor antagonist MK-801; astragalosides)...
May 2018: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29771111/the-chemical-history-of-a-bubble
#7
Kenneth S Suslick, Nathan C Eddingsaas, David J Flannigan, Stephen D Hopkins, Hangxun Xu
Acoustic cavitation (the growth, oscillation, and rapid collapse of bubbles in a liquid) occurs in all liquids irradiated with sufficient intensity of sound or ultrasound. The collapse of such bubbles creates local heating and provides a unique source of energy for driving chemical reactions. In addition to sonochemical bond scission and formation, cavitation also induces light emission in many liquids. This phenomenon of sonoluminescence (SL) has captured the imagination of many researchers since it was first observed 85 years ago...
May 17, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29770859/ionic-liquid-coated-iron-nanoparticles-are-promising-peroxidase-mimics-for-optical-determination-of-h-2-o-2
#8
Faiza Zarif, Sajid Rauf, Muhammad Zahid Qureshi, Noor Samad Shah, Akhtar Hayat, Nawshad Muhammad, Abdur Rahim, Mian Hasnain Nawaz, Muhammad Nasir
Ionic liquid coated nanoparticles (IL-NPs) consisting of zero-valent iron are shown to display intrinsic peroxidase-like activity with enhanced potential to catalyze the oxidation of the chromogenic substrate 3,3',5,5'-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide. This results in the formation of a blue green colored product that can be detected with bare eyes and quantified by photometry at 652 nm. The IL-NPs were further doped with bismuth to enhance its catalytic properties. The Bi-doped IL-NPs were characterized by FTIR, X-ray diffraction and scanning electron microscopy...
May 16, 2018: Mikrochimica Acta
https://www.readbyqxmd.com/read/29770835/ionic-liquids-as-tunable-materials-in-bio-analytical-chemistry
#9
EDITORIAL
Jared L Anderson, Kevin D Clark
No abstract text is available yet for this article.
May 17, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29770820/systematic-analysis-of-various-ionic-liquids-by-attenuated-total-reflectance-spectroscopy-145-450-nm-and-quantum-chemical-calculations
#10
Ichiro Tanabe, Aki Suyama, Taiki Sato, Ken-Ichi Fukui
Despite providing rich information on electronic states, the far-ultraviolet (FUV, <200 nm) and deep-ultraviolet (DUV, <300 nm) absorption spectra of ionic liquids (ILs) are difficult to obtain without saturation due to very strong analyte absorbance. Herein, FUV-DUV spectra of selected ILs were systematically and easily recorded using an attenuated total reflectance spectrometer and rationalized based on quantum chemical calculations. ILs containing pyrrolidinium or ammonium cations and fluorine-containing anions exhibited weak absorbance below 200 nm that could not be measured by conventional UV-Vis spectroscopy, whereas the corresponding imidazolium-based ILs showed distinct absorption bands that could be reproduced by single-cation-model calculations...
May 17, 2018: Analyst
https://www.readbyqxmd.com/read/29768853/ordered-mesoporous-cu-mn-metal-oxides-for-the-catalytic-decomposition-of-an-energetic-ionic-liquid
#11
Sujeong Heo, Sunghoon Hong, Bo Kyeong Jeon, Chengbin Li, Ji Man Kim, Young Min Jo, Wooram Kim, Jong-Ki Jeon
Ordered mesoporous Cu-Mn binary metal oxide (meso-CuMnOx) catalysts were successfully synthesized by a hard-templating method from a mesoporous silica template with a cubic Ia3d mesostructure (KIT-6) or hydrophobic KIT-6, exhibiting a well-developed crystalline framework, a regular pore size distribution and a high surface area. The copper and manganese elements in the mesoporous Cu-Mn binary metal oxides (meso-CuMnOx-N and meso-CuMnOx-HP), obtained from the KIT-6 and hydrophobic KIT-6, respectively, were homogeneously dispersed in the whole particles...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29768833/effect-of-dispersoid-on-sulfonium-ionic-liquid-based-gel-polymer-electrolyte-for-lithium-secondary-battery
#12
R Muthupradeepa, M Sivakumar, R Subadevi, V Suryanarayanan, Wei-Ren Liu
The present study emphases on the effect of toting of TiO2 filler on the electrochemical enactment of polymer electrolyte containing PVdF-co-HFP(30) + SEt3TFSI(10) + EC/PC(60) + TiO2(x) wt% (Poly (vinylidene fluoride-co-hexafluoropropylene + Triethylsulfoniumbis(trifluoromethylsulfonyl)imide + Ethylene carbonate/Propylene carbonate (1:1 ratio) + Titanium dioxide) for lithium battery applications. Composite electrolytes with different weight percentages of TiO2 were prepared and characterized by different surface analytical, thermal and electrochemical techniques...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29768831/polyurethane-based-ionogels-exhibiting-durable-thermoresponsive-optical-behavior-under-high-temperature-conditions
#13
Tomoya Sato, Matt W England, Liming Wang, Chihiro Urata, Hiroshi Kakiuchida, Atsushi Hozumi
Polyurethane (PU)-based transparent and flexible ionogels, showing unusual thermo-responsive optical properties, were successfully prepared by mixing PU-precursor and a hydrophobic ionic liquid, 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (EMIM-TFSI). Although the initial ionogels were transparent at room temperature, significant increases in opacity were observed with increasing temperature up to 120°C, because of macroscopic phase separation of the PU-matrix and hydrophobic EMIM-TFSI. In addition, the optical transition temperature could be arbitrarily controlled simply by varying the mixing ratio of EMIM-TFSI within the PU-matrix...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29767978/dynamics-of-ionic-liquids-assisted-refolding-of-denatured-cytochrome-c-a-study-of-preferential-interactions-towards-renaturation
#14
Upendra Kumar Singh, Rajan Patel
In vitro refolding of denatured proteins and influence of alkyl chain of these organic salts on their performance as refolding enhancers was tested using long chain imidazolium chloride salts, 1-methyl-3-octylimidazolium chloride [C8mim][Cl], 1-decyl-3-methylimidazolium chloride [C10mim][Cl]. The horse heart cytochrome c (h-cyt c) was denatured by urea and guanidinium hydrochloride (GdnHCl), as well as base induced denaturation at pH 13 to provide a broad overview of the overall refolding behavior. The variation in alkyl chain of ionic liquids (ILs) showed a profound effect on the refolding of denatured h-cyt c...
May 16, 2018: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29767208/insights-into-the-thermal-phase-transition-behavior-of-a-gemini-dicationic-polyelectrolyte-in-aqueous-solution
#15
Yingna Zhang, Hui Tang, Peiyi Wu
The thermal-induced phase transition behavior of a LCST-type poly(ionic liquid) (PIL) aqueous solution with gemini-cationic structure, poly[(1,8-octanediyl-bis(tri-n-butylphosphonium)4-styrene sulfonate)] (P[SS-P2]), was investigated in this paper. Based on the calorimetric measurements, a unique dependence of transition points on concentration was found in P[SS-P2] aqueous solution compared to its mono-cationic PIL and [SS-P2] aqueous solution. Optical microscopy showed that globular microscopic droplets were formed during the phase transition, suggesting that gemini dications and the possible dynamic ionic bonds may facilitate the liquid-liquid phase separation (LLPS) in P[SS-P2] aqueous solution...
May 16, 2018: Soft Matter
https://www.readbyqxmd.com/read/29766179/piperidinium-ionic-liquids-as-electrolyte-solvents-for-sustained-high-temperature-supercapacitor-operation
#16
Jennifer Chapman Varela, Karthika Sankar, Alexander Hino, Xinrong Lin, Won-Seok Chang, David Coker, Mark Grinstaff
The synthesis and physicochemical properties of a series of non-flammable, thermally stable alkyl ether containing piperidinium ionic liquid electrolytes, containing lithium bis(trifluoromethanesulfonyl)imide, are described along with the superior performance of a lithium-ion supercapacitor containing a piperidinium electrolyte compared to a standard carbonate-based electrolyte at 100 °C.
May 16, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29765765/cs-tf-2-n-a-second-polymorph-with-a-layered-structure
#17
Jared T Stritzinger, Janelle E Droessler, Brian L Scott, George S Goff
The structural determination of the ionic liquid, caesium bis-[(tri-fluoro-meth-yl)sulfon-yl]imide or poly[[μ4 -bis-[(tri-fluoro-meth-yl)sulfon-yl]imido]caesium(I)], Cs[N(SO2 CF3 )2 ] or Cs[Tf2 N], reveals a second polymorph that also crystallizes in a layer structure possessing monoclinic P 21 / c symmetry at 120 K instead of C 2/ c for the known polymorph [Xue et al. (2002 ▸). Solid State Sci. 4 , 1535-1545]. The caesium ions in the cationic layers are coordinated by the sulfonyl groups of the bis-triflimide mol-ecules from anion layers while the tri-fluoro-methyl groups are oriented in the opposite direction, forming a non-polar surface separating the layers...
April 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/29765044/ambipolar-ferromagnetism-by-electrostatic-doping-of-a-manganite
#18
L M Zheng, X Renshaw Wang, W M Lü, C J Li, T R Paudel, Z Q Liu, Z Huang, S W Zeng, Kun Han, Z H Chen, X P Qiu, M S Li, Shize Yang, B Yang, Matthew F Chisholm, L W Martin, S J Pennycook, E Y Tsymbal, J M D Coey, W W Cao
Complex-oxide materials exhibit physical properties that involve the interplay of charge and spin degrees of freedom. However, an ambipolar oxide that is able to exhibit both electron-doped and hole-doped ferromagnetism in the same material has proved elusive. Here we report ambipolar ferromagnetism in LaMnO3 , with electron-hole asymmetry of the ferromagnetic order. Starting from an undoped atomically thin LaMnO3 film, we electrostatically dope the material with electrons or holes according to the polarity of a voltage applied across an ionic liquid gate...
May 15, 2018: Nature Communications
https://www.readbyqxmd.com/read/29763746/ionic-liquid-type-surfactant-modified-attapulgite-as-a-novel-and-efficient-dispersive-solid-phase-material-for-fast-determination-of-pyrethroids-in-tea-drinks
#19
Xiaoling Yang, XiWen Lin, YiDuo Mi, Haixiang Gao, Jing Li, Sanbing Zhang, Wenfeng Zhou, Runhua Lu
In this study, a novel ionic liquid-type surfactant modified attapulgite named as 1-dodecyl-3-methylimidazolium bromide-attapulgite (C12 MIM-ATP) is successfully prepared and applied in dispersive solid phase extraction (dSPE) for the fast determination of pyrethroid residues in tea drinks. The primary factors that influenced the extraction efficiency, including sorbent type, amount of sorbent, extraction time, desorption conditions, pH and ionic strength, are investigated. The optimized results reveal that the extraction and desorption equilibria are rapidly obtained within 1 min...
April 30, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29763745/analysis-of-malondialdehyde-in-human-plasma-samples-through-derivatization-with-2-4-dinitrophenylhydrazine-by-ultrasound-assisted-dispersive-liquid-liquid-microextraction-gc-fid-approach
#20
Reyhane Malaei, Amir M Ramezani, Ghodratollah Absalan
A sensitive and reliable ultrasound-assisted dispersive liquid-liquid microextraction (UA-DLLME) procedure was developed and validated for extraction and analysis of malondialdehyde (MDA) as an important lipids-peroxidation biomarker in human plasma. In this methodology, to achieve an applicable extraction procedure, the whole optimization processes were performed in human plasma. To convert MDA into readily extractable species, it was derivatized to hydrazone structure-base by 2,4-dinitrophenylhydrazine (DNPH) at 40 °C within 60 min...
May 4, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
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