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https://www.readbyqxmd.com/read/28921978/electrocatalytic-co2-reduction-by-imidazolium-functionalized-molecular-catalysts
#1
Siyoung Sung, Davinder Kumar, Marcos Gil-Sepulcre, Michael Nippe
We present the first examples of CO2 electro-reduction catalysts that feature charged imidazolium groups in the secondary coordination sphere. The functionalized Lehn-type catalysts display significant differences in their redox properties and improved catalytic activities as compared to the conventional reference catalyst. Our results suggest that the incorporated imidazolium moieties do not solely function as a charged tag but also alter mechanistic aspects of catalysis.
September 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28921863/gender-differences-in-brain-networks-during-verbal-sternberg-tasks-a-simultaneous-near-infrared-spectroscopy-and-electro-encephalography-study
#2
Chenyang Gao, Jinyan Sun, Xiaoquan Yang, Hui Gong
Gender differences in psychological processes have been of great interest in a variety of fields including verbal fluency, emotion processing, and working memory. Previous studies suggested that women outperform men in verbal working memory (VWM). However, the inherent mechanisms are still unclear. To obtain a deeper insight into the gender differences in brain networks in VWM, this study used near-infrared spectroscopy (NIRS) and electro-encephalography (EEG) simultaneously to investigate gender-related brain networks during verbal Sternberg tasks...
September 17, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28921692/mechanistic-studies-on-the-role-of-cuii-co3-n-2-2n-as-a-water-oxidation-catalyst-carbonate-as-a-non-innocent-ligand
#3
Amir Mizrahi, Dan Meyerstein, Israel Zilbermann, Haya Kornweitz, Eric Maimon, Haim Cohen
Recently it was reported that copper bicarbonate/ carbonate complexes are good electro-catalysts for water oxidation. However, the results did not enable a decision whether the active oxidant is a CuIII or a CuIV complex. Kinetic analysis of pulse radiolysis measurements coupled with DFT calculations point out that CuIII(CO3)n3-2n complexes are the active intermediates in the electrolysis of CuII(CO3)n2-2n solution. The results enable the evaluation of E°((CuIII/II(CO3)n)aq) ~ 1.42 V vs. NHE at pH 8.4. This redox potential is in accord with the electrochemical report...
September 16, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28920894/electro-thermal-equivalent-3d-finite-element-model-of-a-single-neuron
#4
I Cinelli, M Destrade, M Duffy, P McHugh
OBJECTIVE: We propose a novel approach for modelling the inter-dependence of electrical and mechanical phenomena in nervous cells, by using electro-thermal equivalences in finite element (FE) analysis so that existing thermo-mechanical tools can be applied. METHODS: First, the equivalence between electrical and thermal properties of the nerve materials is established, and results of a pure heat conduction analysis performed in Abaqus CAE Software 6.13-3 are validated with analytical solutions for a range of steady and transient conditions...
September 14, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28920695/organic-radicals-outperform-lif-as-efficient-electron-injection-materials-for-organic-light-emitting-diodes
#5
Zhengyang Bin, Ziyang Liu, Lian Duan
One of the key issues for organic light emitting diodes (OLEDs) is to achieve high electro-luminescence efficiency and high power efficiency, which requires extremely efficient electron-injection and thus low driving-voltage. Here, we design a series of precursors for reactive organic radicals according to theoretical calculations and achieve efficient electron-injection by using highly reducing radical on the surface of electron-injection layer to reduce electron-injection barrier through interface charge-transfer process...
September 18, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28920603/controlling-cation-segregation-in-perovskite-based-electrodes-for-high-electro-catalytic-activity-and-durability
#6
REVIEW
Yifeng Li, Wenqiang Zhang, Yun Zheng, Jing Chen, Bo Yu, Yan Chen, Meilin Liu
Solid oxide cell (SOC) based energy conversion systems have the potential to become the cleanest and most efficient systems for reversible conversion between electricity and chemical fuels due to their high efficiency, low emission, and excellent fuel flexibility. Broad implementation of this technology is however hindered by the lack of high-performance electrode materials. While many perovskite-based materials have shown remarkable promise as electrodes for SOCs, cation enrichment or segregation near the surface or interfaces is often observed, which greatly impacts not only electrode kinetics but also their durability and operational lifespan...
September 18, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28920009/raman-under-water-nonlinear-and-nearfield-approaches-for-electrochemical-surface-science
#7
REVIEW
Natalia Martín Sabanés, Katrin F Domke
Electrochemistry is re-gaining attention among scientists because the complex interplay between electronic and chemical interfacial processes lies at the bottom of a broad range of important research disciplines like alternative energy conversion or green catalysis and synthesis. While rapid progress has been made in recent years regarding novel technological applications, the community increasingly recognizes that the understanding of the molecular processes that govern macroscopic device properties is still rather limited - which hinders a systematic and more complete exploration of novel material and functionality space...
August 2017: ChemElectroChem
https://www.readbyqxmd.com/read/28918077/membrane-electro-oxidizer-a-new-hybrid-membrane-system-with-electrochemical-oxidation-for-enhanced-organics-and-fouling-control
#8
Naresh Mameda, Hyung-June Park, Kwang-Ho Choo
The synergistic combination of membrane filtration with advanced oxidation is of particular interest for next-generation wastewater treatment technologies. A membrane electro-oxidizer (MEO) hybridizing a submerged microfilter and an electrochemical cell was developed and investigated for tertiary treatment of secondary industrial (textile) wastewater effluent. Laboratory- and pilot-scale MEO systems were designed and evaluated for treatment efficiency and membrane fouling control. The MEO achieved substantial removal of color (50-90%), turbidity (>90%), and bacteria (>4 log) as well as chemical oxygen demand (13-31%) and 1,4-dioxane (∼25-53%)...
September 5, 2017: Water Research
https://www.readbyqxmd.com/read/28917790/a-green-solvent-holder-in-electro-mediated-microextraction-for-the-extraction-of-phenols-in-water
#9
Yu Ting Chong, Marinah Mohd Ariffin, Norhayati Mohd Tahir, Saw Hong Loh
Electro-mediated microextraction (EMM) combined with micro-high performance liquid chromatography-ultraviolet detection was successfully developed for the determination of selected phenols, namely 4-chlorophenol (4CP), 2-nitrophenol (2NP) and 2,4-dichlorophenols (2,4 DCP) in water. A solvent-impregnated agarose gel disc was utilized as a solvent holder in this study. Under optimum extraction conditions, the method showed good linearity in the range of 0.1-250µgL(-1), 0.3-250µgL(-1) and 0.2-500µgL(-1) for 4CP, 2NP and 2,4 DCP, respectively with correlation coefficients of ≥ 0...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917767/hierarchical-oxygen-implanted-mos2-nanoparticle-decorated-graphene-for-the-non-enzymatic-electrochemical-sensing-of-hydrogen-peroxide-in-alkaline-media
#10
Yudong Xue, Govindhan Maduraiveeran, Mingyong Wang, Shili Zheng, Yi Zhang, Wei Jin
Owing to the extensive applications of hydrogen peroxide (H2O2) in biological, environmental and chemical engineering, it is of great importance to investigate sensitive and selective sensing platform towards the detection of H2O2. Herein, oxygen-implanted MoS2 nanoparticles decorated graphene nanocomposite is synthesized via a facile one-pot solvothermal method for the sensitive detection of H2O2 in alkaline media. The structure and morphology of the MoS2/graphene nanocomposites were systematically characterized, showing that Mo-O bonds are formed and oxygen is implanted into the crystal structure in the nanocomposite...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28916744/hydrogen-sulphate-based-ionic-liquid-assisted-electro-polymerization-of-pedot-catalyst-material-for-high-efficiency-photoelectrochemical-solar-cells
#11
Buket Bezgin Carbas, Mahir Gulen, Merve Celik Tolu, Savas Sonmezoglu
This work reports the facile, one-step electro-polymerization synthesis of poly (3,4-ethylenedioxythiophene) (PEDOT) using a 1-ethyl-3-methylimidazolium hydrogen sulphate (EMIMHSO4) ionic liquid (IL) and, for the first time its utilization as a counter electrode (CE) in dye-sensitized solar cells (DSSCs). Using the IL doped PEDOT as CE, we effectively improve the solar cell efficiency to as high as 8.52%, the highest efficiency reported in 150 mC/cm(2) charge capacity, an improvement of ~52% over the control device using the bare PEDOT CE (5...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28916032/polymer-inclusion-membranes-pims-in-chemical-analysis-a-review
#12
REVIEW
M Inês G S Almeida, Robert W Cattrall, Spas D Kolev
This review highlights the increasing interest in polymer inclusion membranes (PIMs) in analytical chemistry as they are adapted to new and novel applications. PIMs are polymer-based liquid membranes and were first introduced 50 years ago as the sensing membranes in ion-selective electrodes and optodes. More recently however, PIMs have been used for other applications in analytical chemistry such as for sample separation, sample pre-concentration, electro-driven extraction, and passive sampling, and have also been incorporated into on-line and automated analysis systems...
September 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28915483/sulphur-and-nitrogen-dual-doped-mesoporous-carbon-hybrid-coupling-with-graphite-coated-cobalt-and-cobalt-sulfide-nanoparticles-rational-synthesis-and-advanced-multifunctional-electrochemical-properties
#13
Anquan Zhu, Pengfei Tan, Lulu Qiao, Yi Liu, Yongjin Ma, Jun Pan
Doping-type carbon matrixes not only play a vital role on their electrochemical properties, but also are capable of suppressing the crush and aggregation phenomenon in the electrode reaction process for pristine metallic compound. Herein, graphite coated cobalt and cobalt sulfide nanoparticles decorating on sulphur and nitrogen dual-doped mesoporous carbon (Co@Co9S8/S-N-C) was fabricated by a combined hydrothermal reaction with pyrolysis method. Benefited from g-C3N4 template and original synthetic route, as-obtained Co@Co9S8/S-N-C possessed high specific surface area (751...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28915379/study-on-the-oxygen-reduction-reaction-catalyzed-by-a-cold-tolerant-marine-strain-phylogenetically-related-to-erythrobacter-citreus
#14
Lianqiang Li, Fei Ding, Lin Sang, Jiaquan Liu, Duolu Mao, Xingjiang Liu, Qiang Xu
As the development of marine economy, the submarine battery with the seawater electrolyte has obtained more and more attentions. Owing to the conventional electrochemical catalysts of the cathodes in seawater battery are expensive, it is to seek the new biological catalysts to improve the electrochemical performance of the cathode and reduce the cost of seawater battery. A novel marine bacterial strain (Strain SQ-32) phylogenetically related to the Erythrobactercitreus strain has been isolated from the sea-bed sludge in the Yellow Sea of China successfully...
September 8, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28914927/secure-communications-of-cap-4-and-ook-signals-over-mmf-based-on-electro-optic-chaos
#15
Jianzhou Ai, Lulu Wang, Jian Wang
Chaos-based secure communication can provide a high level of privacy in data transmission. Here, we experimentally demonstrate secure signal transmission over two kinds of multimode fiber (MMF) based on electro-optic intensity chaos. High-quality synchronization is achieved in an electro-optic feedback configuration. Both 5  Gbit/s carrier-less amplitude/phase (CAP-4) modulation and 10  Gbit/s on-off key (OOK) signals are recovered efficiently in electro-optic chaos-based communication systems. Degradations of chaos synchronization and communication system due to mismatch of various hardware keys are also discussed...
September 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28914536/determination-of-the-true-lateral-grain-size-in-organic-inorganic-halide-perovskite-thin-films
#16
Gordon A MacDonald, Chelsea M Heveran, Mengjin Yang, David Moore, Kai Zhu, Virginia L Ferguson, Jason P Killgore, Frank William DelRio
In this letter, methylammonium lead iodide (MAPbI3) thin films were examined via piezoresponse force microscopy (PFM) and nanoindentation (NI) to determine if long-range atomic order existed across the full width and depth of the apparent grains. From the PFM, the piezoelectric response of the films was strongly correlated with low-index planes of the crystal structure and ferroelastic domains in macro-scale solution-grown MAPbI3 crystals, which implied long-range order near the top surface. From the NI, it was found that the induced cracks were straight and extended across the full width of the apparent grains, which indicated that the long-range order was not limited to the near-surface region, but extended through the film thickness...
September 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28914532/aggregation-induced-electrochemiluminescence-of-platinum-ii-complexes
#17
Serena Carrara, Alessandro Aliprandi, Conor F Hogan, Luisa De Cola
We report the electrochemiluminescence properties of square-planar Pt(II) complexes which result from the formation of supramolecular nanostructures. We define this new phenomenon as Aggregation-Induced Electrochemiluminescence (AIECL). In this system, self-assembly changes the HOMO and LUMO energies, making their population accessible via ECL pathways and leading to the generation of the luminescent excited state. Significantly, the emission from the self-assembled system is the first example of Electro-chemiluminescence (ECL) of Pt(II) complexes in aque-ous solution having higher efficiency than the standard, Ru(bpy)32+...
September 15, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28914409/evaluation-of-contactless-human-machine-interface-for-robotic-surgical-training
#18
Fabien Despinoy, Nabil Zemiti, Germain Forestier, Alonso Sánchez, Pierre Jannin, Philippe Poignet
PURPOSE: Teleoperated robotic systems are nowadays routinely used for specific interventions. Benefits of robotic training courses have already been acknowledged by the community since manipulation of such systems requires dedicated training. However, robotic surgical simulators remain expensive and require a dedicated human-machine interface. METHODS: We present a low-cost contactless optical sensor, the Leap Motion, as a novel control device to manipulate the RAVEN-II robot...
September 15, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28913497/ecog-spectrum-changes-at-different-xenon-isoflurane-anaesthesia-depths
#19
Bogdan Pavel, Camelia Alexandra Acatrinei, Maria Corbu, Carmen Mihaela Denise Zahiu, Adrian Eugen Rosca, Leon Zagrean, Ana-Maria Zagrean
BACKGROUND AND AIMS: The purpose of this study is to assess the frontal and parietal ECoG spectrum (gamma range) changes during isoflurane and combined xenon-isoflurane anaesthesia in rats. METHODS: Experiments were carried out on four adult male Sprague-Dawley rats (250-300 g). The anaesthesia was induced with isoflurane and maintained with isoflurane and a xenon-isoflurane mixture. The rats were maintained at two different anaesthetic depths: light (isoflurane anaesthesia) and deep (isoflurane and xenon-isoflurane anaesthesia)...
April 2017: Rom J Anaesth Intensive Care
https://www.readbyqxmd.com/read/28910510/tuning-of-co2-reduction-selectivity-on-metal-electrocatalysts
#20
REVIEW
Yuhang Wang, Junlang Liu, Yifei Wang, Abdullah M Al-Enizi, Gengfeng Zheng
Climate change, caused by heavy CO2 emissions, is driving new demands to alleviate the rising concentration of atmospheric CO2 levels. Enlightened by the photosynthesis of green plants, photo(electro)chemical catalysis of CO2 reduction, also known as artificial photosynthesis, is emerged as a promising candidate to address these demands and is widely investigated during the past decade. Among various artificial photosynthetic systems, solar-driven electrochemical CO2 reduction is widely recognized to possess high efficiencies and potentials for practical application...
September 14, 2017: Small
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