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https://www.readbyqxmd.com/read/28549859/ethnopharmacological-investigations-of-the-cardio-renal-properties-of-a-native-species-from-the-region-of-pantanal-state-of-mato-grosso-do-sul-brazil
#1
Cleide Adriane Signor Tirloni, Francislaine Aparecida Dos Reis Lívero, Rhanany Alan Calloi Palozi, Renan César Alves Silveira, Paulo César de Paula Vasconcelos, Roosevelt Isaias Carvalho Souza, Ariany Carvalho Dos Santos, Valter Paes de Almeida, Jane Manfron Budel, Lauro Mera de Souza, Arquimedes Gasparotto Junior
ETHNOPHARMACOLOGICAL RELEVANCE: Acanthospermum hispidum DC. is an important medicinal herb that belongs to family Asteraceae, popularly used as a diuretic and hypotensive in the region of Pantanal, state of Mato Grosso do Sul, Brazil. Despite the relevance of this species throughout the country, there are no detailed studies about its possible ethnobotanical indication. AIM: To carry out a detailed ethnopharmacological investigation of the cardio-renal properties of A...
May 23, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28540952/investigating-the-effect-of-ionic-strength-on-the-suppression-of-dendrite-formation-during-metal-electrodeposition
#2
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
#3
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/28533551/ionic-liquids-evidence-of-the-viscosity-scale-dependence
#4
Quentin Berrod, Filippo Ferdeghini, Jean-Marc Zanotti, Patrick Judeinstein, Didier Lairez, Victoria García Sakai, Orsolya Czakkel, Peter Fouquet, Doru Constantin
Ionic Liquids (ILs) are a specific class of molecular electrolytes characterized by the total absence of co-solvent. Due to their remarkable chemical and electrochemical stability, they are prime candidates for the development of safe and sustainable energy storage systems. The competition between electrostatic and van der Waals interactions leads to a property original for pure liquids: they self-organize in fluctuating nanometric aggregates. So far, this transient structuration has escaped to direct clear-cut experimental assessment...
May 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28530820/behavior-of-germanium-and-silicon-nanowire-anodes-with-ionic-liquid-electrolytes
#5
Guk-Tae Kim, Tadhg Kennedy, Michael Brandon, Hugh Geaney, Kevin M Ryan, Stefano Passerini, Giovanni B Appetecchi
The electrochemical behavior of binder-free, germanium and silicon nanowires as high-capacity anode materials for lithium-ion battery systems is investigated in an ionic liquid electrolyte. Cyclic voltammetry, cycling tests, and impedance spectroscopy reveal a highly reversible lithium alloying/dealloying process, as well as promising compatibility between the Ge and Si materials and the electrolyte components. Reversible capacities of 1400 and 2200 mA h g(-1) are delivered by the Ge and Si anodes, respectively, matching the values exhibited in conventional organic solutions...
May 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28527458/conformation-change-of-an-isotactic-poly-n-isopropylacrylamide-membrane-molecular-dynamics
#6
Irene Adroher-Benítez, Arturo Moncho-Jordá, Gerardo Odriozola
In this work, isotactic Poly (N-Isopropylacrylamide)-PNIPAM-in neat water and in electrolyte solutions is studied by means of molecular dynamics simulations. This is done for an infinitely diluted oligomer and for an assembly of several PNIPAM chains arranged into a planar membrane configuration with a core-shell morphology. We employed two different force fields, AMBER (assisted model building with energy refinement) and OPLS-AA (all atom - optimized potentials for liquid simulations) in combination with extended simple point charge water...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28521081/thermophysical-and-electrochemical-properties-of-ethereal-functionalised-cyclic-alkylammonium-based-ionic-liquids-as-potential-electrolytes-for-electrochemical-applications
#7
Alex Ryan Neale, Sinead Murphy, Peter Goodrich, Christopher Hardacre, Johan Jacquemin
A series of hydrophobic room temperature ionic liquids (ILs) based on ethereal functionalised pyrrolidinium, piperidinium and azepanium cations bearing the bis{(trifluoromethyl)sulfonyl}imide, [TFSI]-, anion were synthesized and characterized. Their physicochemical properties such as density, viscosity and electrical conductivity and thermal properties including phase transition behaviour and decomposition temperature have been measured. All of the ILs showed low melting point, low viscosity and good conductivity and the latter properties have been discussed in terms of the IL fragility, an important electrolyte feature of the transport properties of glassy-forming ILs...
May 18, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28511001/monolayer-solid-state-electrolyte-for-electric-double-layer-gating-of-graphene-field-effect-transistors
#8
Ke Xu, Hao Lu, Erich W Kinder, Alan Seabaugh, Susan K Fullerton-Shirey
The electrostatic gating of graphene field-effect transistors (FETs) is demonstrated using a two-dimensional (2D) electrolyte. The electrolyte, cobalt crown ether phthalocyanine (CoCrPc) and LiClO4, is deposited as a monolayer on the graphene channel. The crown ethers on the CoCrPc solvate lithium ions, and the ion location is modulated by a backgate without requiring liquid solvent. Ions dope the channel by inducing image charges; the doping level (i.e., induced charge density) can be modulated by the backgate bias with the extent of the surface potential change being controlled by the magnitude and polarity of the backgate bias...
May 16, 2017: ACS Nano
https://www.readbyqxmd.com/read/28506057/liquid-spray-dielectric-barrier-discharge-induced-plasma-chemical-vapor-generation-for-the-determination-of-lead-by-icpms
#9
Xing Liu, Zhenli Zhu, Huilai Li, Dong He, Yatai Li, Hongtao Zheng, Yiqun Gan, Yanxiang Li, Nicholas Stanley Belshaw, Shenghong Hu
In the present study, a novel and sensitive liquid spray dielectric barrier discharge induced plasma-chemical vapor generation technique (LSDBD-CVG) is developed for the determination of lead concentration by inductively coupled plasma mass spectrometry (ICPMS). The dissolved Pb(2+) is readily converted to volatile species by LSDBD plasma induced chemical processes in the presence of 5% (v/v) formic acid in a supporting electrolyte (HCl, 0.01 mol L(-1)). In this LSDBD approach, the sample solution is converted to aerosol and simultaneously mixed with the DBD plasma generated at the nozzle of a pneumatic nebulizer, which greatly facilitates Pb vapor generation because of the enhanced interaction of sprayed analytes and the plasma...
May 25, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28505846/traveling-waves-and-worms-in-ac-driven-electroconvection-under-external-multiplicative-noise
#10
Jong-Hoon Huh
In the presence of external multiplicative noise, ac-driven electroconvection (EC) in a nematic liquid crystal is investigated. Noise-induced traveling waves (TWs) including localized ones (worms) are found with a typical, stationary wave. Three kinds of TWs are classified by their dynamic features (e.g., noise-intensity-dependent Hopf frequency and space-time map). Moreover, ac frequency-dependent threshold voltages of EC are examined in high noise intensities causing abnormal charge redistribution of the EC cell, and the roles of ac and noise fields with respect to TWs are elucidated in successive pattern evolutions...
April 2017: Physical Review. E
https://www.readbyqxmd.com/read/28505404/activated-porous-carbon-spheres-with-customized-mesopores-through-assembly-of-diblock-copolymers-for-electrochemical-capacitor
#11
Jing Tang, Jie Wang, Lok Kumar Shrestha, Md Shahriar A Hossain, Zeid Abdullah Alothman, Yusuke Yamauchi, Katsuhiko Ariga
A series of porous carbon spheres with precisely adjustable mesopores (4~16 nm), high specific surface area (SSA, ~2000 m2 g-1), and sub-micrometer particle size (~300 nm) have been synthesized through a facile co-assembly of diblock polymer micelles with a nontoxic dopamine source, and a common post-activation process. The mesopore size can be controlled by the diblock polymer, polystyrene-block-poly(ethylene oxide) (PS-b-PEO) templates and has an almost linear dependence on the square root of the degree of polymerization of the PS blocks...
May 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28501214/capillary-electrophoresis-tandem-mass-spectrometry-determination-of-glutamic-acid-and-homocysteine-s-metabolites-potential-biomarkers-of-amyotrophic-lateral-sclerosis
#12
Zuzana Cieslarova, Fernando Silva Lopes, Claudimir Lucio do Lago, Marcondes Cavalcante França, Ana Valéria Colnaghi Simionato
Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease that affects both lower and upper motor neurons, leading to muscle atrophy, paralysis, and death caused by respiratory failure or infectious complications. Altered levels of homocysteine, cysteine, methionine, and glutamic acid have been observed in plasma of ALS patients. In this context, a method for determination of these potential biomarkers in plasma by capillary electrophoresis tandem mass spectrometry (CE-MS/MS) is proposed herein. Sample preparation was carefully investigated, since sulfur-containing amino acids may interact with plasma proteins...
August 1, 2017: Talanta
https://www.readbyqxmd.com/read/28499855/electrolyte-type-and-nozzle-composition-affect-the-process-of-vibrating-membrane-nebulization
#13
Moritz Beck-Broichsitter, Nina Oesterheld
The size of airborne particles determines their deposition pattern within the lungs and therefore, the efficacy of inhalation therapy. The present study analyzed factors affecting liquid atomization performed by vibrating-membrane technology. First, the process of vibrating-membrane nebulization (eFlow(®)rapid and Aeroneb(®) Pro) was challenged with numerous inorganic salts and active pharmaceutical ingredients. All investigated samples caused a sigmoidal decrease in aerosol droplet size upon an increase in concentration...
May 9, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28499327/impact-of-polyethyleneglycol-addition-on-diffusion-coefficients-in-binary-ionic-liquid-electrolytes-composed-of-dicationic-ionic-liquid-and-polyethyleneglycol
#14
Tzi-Yi Wu, Shyh-Gang Su, Chuen-Lin Chiu, Chung-Wen Kuo, Yi-Hsuan Tung
We conduct a comparative study of conductivity and diffusion coefficient of two dicationic ionic liquids (3,3'-(octane-1,8-diyl)bis(1-ethyl-3-imidazolium) bis(trifluoromethylsulfonyl)amide ([IMCI][TFSI], S1) and 3,3'-(2,2'-(ethane-1,2-diylbis(oxy))bis(ethane-2,1-diyl))bis(1-ethyl-3-imidazolium) bis(trifluoromethylsulfonyl)amide ([IMOI][TFSI], S2)) at various temperatures. The diffusion coefficients of cation and anion in ionic liquids (ILs) are determined using pulse gradient spin-echo nuclear magnetic resonance (PGSE-NMR) method...
May 12, 2017: Magnetic Resonance in Chemistry: MRC
https://www.readbyqxmd.com/read/28498664/atmospheric-aqueous-aerosol-surface-tensions-isotherm-based-modeling-and-biphasic-microfluidic-measurements
#15
Hallie C Boyer, Cari S Dutcher
Surface properties of atmospheric aerosol particles are crucial for accurate assessments of the fates of liquid particles in the atmosphere. Surface tension directly influences predictions of particle activation to clouds, as well as indirectly acts as a proxy for chemical surface partitioning. Challenges to accounting for surface effects arise from surface tension dependence on solution concentration and the presence of complex aqueous mixtures in aerosols, including both surface-active organic solutes and inorganic electrolytes...
May 12, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28498642/in-situ-probing-of-ion-ordering-at-an-electrified-ionic-liquid-au-interface
#16
Wattaka Sitaputra, Dario Stacchiola, James F Wishart, Feng Wang, Jerzy T Sadowski
Charge transport at the interface of electrodes and ionic liquids is critical for the use of the latter as electrolytes. A room-temperature ionic liquid, 1-ethyl-2,3-dimethylimidazolium bis(trifluoromethanesulfonyl)imide (EMMIM TFSI), is investigated in situ under applied bias voltage with a novel method using low-energy electron and photoemission electron microscopy. Changes in photoelectron yield as a function of bias applied to electrodes provide a direct measure of the dynamics of ion reconfiguration and electrostatic responses of the EMMIM TFSI...
May 12, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28492325/theoretical-study-of-the-solvation-effect-on-the-reductive-reaction-of-vinylene-carbonate-in-the-electrolyte-solution-of-lithium-ion-batteries
#17
Kento Kasahara, Hiroshi Nakano, Hirofumi Sato
Carbon monoxide generation reaction of vinylene carbonate (VC) in the electrolyte solution of lithium ion batteries (ethylene carbonate (EC) and 1.0 M LiClO4/EC) is studied using the RISM-SCF-SEDD method, a hybrid methodology of statistical mechanics for molecular liquids and quantum chemistry. The analytical treatment of the solvent and lithium salt enables us to treat the complicated composition of the solution such as the concentration of the salt which is difficult for the methods based on the molecular dynamics (MD) simulation...
May 11, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28485922/in-situ-nanopore-fabrication-and-single-molecule-sensing-with-microscale-liquid-contacts
#18
Christopher E Arcadia, Carlos C Reyes, Jacob K Rosenstein
In this article, we introduce a flexible technique for high-throughput solid-state nanopore analysis of single biomolecules. By confining the electrolyte to a micron-scale liquid meniscus at the tip of a glass micropipette, we enable automation and reuse of a single solid-state membrane chip for measurements with hundreds of distinct nanopores per day. In addition to overcoming important experimental bottlenecks, the microscale liquid contact dramatically reduces device capacitance, which is a key limiting factor to the speed and fidelity of solid-state nanopore sensor recordings...
May 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28482382/-application-of-improved-regional-citrate-anticoagulation-in-continuous-hemofiltration-in-children
#19
K Bai, C J Liu, Y Q Fu, F Xu
Objective: To investigate the application of regional citrate anticoagulation with calcium hemofiltration basic solution in continuous hemofiltration in children. Method: The clinical data of 18 patients with citrate anticoagulation in continuous hemofiltration in children, excluding the hepatic failure and septic shock cases, were analyzed retrospectively, from September 2015 to August 2016 in Intensive Care Unit of the Children's Hospital of Chongqing Medical University.The commercial calcium hemofiltration basic solution was used as displacement liquid ...
May 4, 2017: Zhonghua Er Ke za Zhi. Chinese Journal of Pediatrics
https://www.readbyqxmd.com/read/28481552/lio2-cryosynthesis-and-chemical-electrochemical-reactivities
#20
Xinmin Zhang, Limin Guo, Linfeng Gan, Yantao Zhang, Jing Wang, Lee R Johnson, Peter G Bruce, Zhangquan Peng
The reduction of O2 to solid Li2O2, via the intermediates O2(-) and LiO2, is the desired discharge reaction at the positive electrode of the aprotic Li-O2 batteries. In practice, a plethora of byproducts are identified together with Li2O2 and have been assigned to the side reactions between the reduced oxygen species (O2(-), LiO2, and Li2O2) and the battery components (the cathode and electrolyte). Understanding the reactivity of these reduced oxygen species is critical for the development of stable battery components and thus high cycle life...
May 11, 2017: Journal of Physical Chemistry Letters
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