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https://www.readbyqxmd.com/read/28222390/epr-and-photophysical-characterization-of-six-bioactive-oxidovanadium-iv-complexes-in-the-conditions-of-in-vitro-cell-tests
#1
Marta Lovisari, Giorgio Volpi, Domenica Marabello, Silvano Cadamuro, Annamaria Deagostino, Eliano Diana, Alessandro Barge, Margherita Gallicchio, Valentina Boscaro, Elena Ghibaudi
A number of oxidovanadium(IV) complexes have been reported to display anticancer activity. A theranostic approach, based on the simultaneous observation of both the effect of oxidovanadium(IV) complexes on cell viability and the disclosure of their intracellular fate, is possible by using oxidovanadium(IV) complexes functionalized with fluorescent ligands. In the present study we accomplished the characterization of six oxidovanadium(IV) complexes in conditions close to those employed for in vitro administration...
February 13, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28222304/fabrication-of-novel-visible-light-driven-agi-g-c3n4-composites-with-enhanced-visible-light-photocatalytic-activity-for-diclofenac-degradation
#2
Wei Zhang, Li Zhou, Jun Shi, Huiping Deng
A visible-light-driven heterostructured AgI/g-C3N4 was prepared by a deposition-precipitation method. The composition, structure, morphology, and optical properties of the photocatalyst were characterized by Brunauer-Emmett-Teller method (BET), X-ray powder diffraction (XRD), Fourier transform-infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), scanning electron microscope (SEM), UV-vis diffused reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL), photocurrent, and electrochemical impedance spectroscopy (EIS), respectively...
February 14, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28222258/a-simple-and-large-scale-strategy-to-prepare-flexible-graphene-tape-electrode
#3
Li Wang, Jie Yu, Yayun Zhang, Han Yang, Longfei Miao, Yonghai Song
A simple and large-scale strategy to prepare flexible graphene tape electrode (GTE) was proposed. The flexible GTE was prepared by a facile peeling method in which a piece of commercial graphite foil was firstly covered by a commercial acrylic transparent tape and then the transparent adhesive tape was quickly torn off from the graphite foil. Scanning electron microscopy results showed that some folded and wrinkled graphene layers stood up on the GTE surface to form three-dimensional (3D) porous graphene foam...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28221777/rhenium-complexes-based-on-2-pyridyl-1-2-3-triazole-ligands-a-new-class-of-co2-reduction-catalysts
#4
H Y Vincent Ching, Xia Wang, Menglan He, Noemi Perujo Holland, Régis Guillot, Cyrine Slim, Sophie Griveau, Hélène C Bertrand, Clotilde Policar, Fethi Bedioui, Marc Fontecave
A series of [Re(N^N)(CO)3(X)] (N^N = diimine and X = halide) complexes based on 4-(2-pyridyl)-1,2,3-triazole (pyta) and 1-(2-pyridyl)-1,2,3-triazole (tapy) diimine ligands have been prepared and electrochemically characterized. The first ligand-based reduction process is shown to be highly sensitive to the nature of the isomer as well as to the substituents on the pyridyl ring, with the peak potential changing by up to 700 mV. The abilities of this class of complexes to catalyze the electroreduction and photoreduction of CO2 were assessed for the first time...
February 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28221774/surface-electronic-state-modulated-single-crystalline-001-tio2-nanosheets-for-sensitive-electrochemical-sensing-of-heavy-metal-ions
#5
Wen-Yi Zhou, Jinyun Liu, Jieyao Song, Jinjin Li, Jinhuai Liu, Xing-Jiu Huang
Intrinsically low conductivity and poor reactivity restrict many semiconductors from electrochemical detection. Usually, metal- and carbon-based modifications of semiconductors are necessary, making them complex, expensive, and unstable. Here, for the first time, we present a surface-electronic-state-modulation-based concept applied to semiconductors. This concept enables pure semiconductors to be directly available for ultrasensitive electrochemical detection of heavy-metal ions without any modifications. As an example, a defective single-crystalline (001) TiO2 nanosheet exhibits high electrochemical performance toward Hg(II), including a sensitivity of 270...
February 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28221360/why-copper-is-preferred-over-iron-for-oxygen-activation-and-reduction-in-haem-copper-oxidases
#6
Ambika Bhagi-Damodaran, Matthew A Michael, Qianhong Zhu, Julian Reed, Braddock A Sandoval, Evan N Mirts, Saumen Chakraborty, Pierre Moënne-Loccoz, Yong Zhang, Yi Lu
Haem-copper oxidase (HCO) catalyses the natural reduction of oxygen to water using a haem-copper centre. Despite decades of research on HCOs, the role of non-haem metal and the reason for nature's choice of copper over other metals such as iron remains unclear. Here, we use a biosynthetic model of HCO in myoglobin that selectively binds different non-haem metals to demonstrate 30-fold and 11-fold enhancements in the oxidase activity of Cu- and Fe-bound HCO mimics, respectively, as compared with Zn-bound mimics...
March 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28221025/synergistic-effects-of-stabilizing-the-surface-structure-and-lowering-the-interface-resistance-in-improving-the-low-temperature-performances-of-layered-lithium-rich-materials
#7
Shi Chen, Lai Chen, Yitong Li, Yuefeng Su, Yun Lu, Liying Bao, Jing Wang, Meng Wang, Feng Wu
Layered lithium-rich cathode material, Li1.2Ni0.2Mn0.6O2 was successfully synthesized by a sol-gel method followed by coating with different amount of Li3-BO3 (LBO, 1wt %, 3wt %, 5wt %). The effects of LBO coating layer on the structure, morphology and low-temperature (-30 °C) electrochemical properties of these materials are investigated systematically. The morphology, crystal structure and grain size of the Li-rich layered oxide are not essentially changed after surface modification; and according to the TEM results, the Li-B-O coating layer exists as an amorphous layer with a thickness of 5~8 nm when the amount is 3wt %...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28221020/a-scalable-approach-to-construct-free-standing-and-flexible-carbon-networks-for-lithium-sulfur-battery
#8
Mengliu Li, Wandi Wahyudi, Pushpendra Kumar, Feng-Yu Wu, Xiulin Yang, Henan Li, Lain-Jong Li, Jun Ming
Reconstructing carbon nanomaterials such as fullerene, carbon nanotubes (CNTs) and graphene to a hierarchical network structure is useful in exploring their applications. Herein, a sacrificial template method combined with the casting strategy is developed to prepare highly flexible and free-standing carbon film consisting of CNTs, graphene, or both. The scalable size, ultralight and binder-free characteristics, as well as the tunable process/property are promising for their large-scale applications, such as utilizing as interlayers in lithium-sulfur batteries...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28221019/3-3-ethylenedioxy-dipropiononitrile-edpn-as-an-electrolyte-additive-for-4-5v-lini1-3co1-3mn1-3o2-graphite-cells
#9
Chengyun Wang, Le Yu, Weizhen Fan, Jiangwen Liu, Liuzhang Ouyang, Lichun Yang, Min Zhu
3,3'-(ethylenedioxy)dipropiononitrile (EDPN) has been introduced as a novel electrolyte additive to improve the oxidation stability of the conventional carbonate-based electrolyte for LiNi1/3Co1/3Mn1/3O2/graphite pouch batteries cycled under high voltage. Mixing 0.5 wt.% EDPN into the electrolyte greatly improved the capacity retention, from 32.5% to 83.9%, of cells cycled for 100 times in the range 3.0-4.5V with a rate of 1C. The high rate performance (3C and 5C) was also improved, while the cycle performance was similar to that of the cell without EDPN when cycled between 3...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28221015/taking-orders-from-light-photo-switchable-working-inactive-smart-surfaces-for-protein-and-cell-adhesion
#10
Junji Zhang, Wenjing Ma, Xiao-Peng He, He Tian
Photo-responsive smart surfaces are promising candidates for a variety of applications in optoelectronics and sensing devices. The use of light as an order-signal provides advantages of remote and non-invasive control with high temporal and spatial resolutions. Modification of the photo-switches with target bio-macromolecules, such as peptides, DNA and small-molecules including folic acid derivatives and sugars, has recently become a popular strategy to empower the smart surfaces with an improved detection efficiency and specificity...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28221009/synthesis-and-exploration-of-ladder-structured-large-aromatic-dianhydrides-as-organic-cathodes-for-rechargeable-lithium-batteries
#11
Qichun Zhang, Jian Xie, Wangqiao Chen, Zilong Wang, Choo Wei Jie Kenneth Choo Wei Jie, Ming Liu
Comparing to anode materials in Li-ion batteries, the research on cathode materials is far behind and their capacities are much smaller. Thus, in order to address these issues, we believe that organic conjugated materials could be a solution. In this study, we demonstrate two non-polymeric dianhydrides with large aromatic structures: NDA-4N (naphthalenetetracarboxylicdianhydride with four nitrogen atoms) and PDA-4N (perylenetetracarboxylicdianhydride with four nitrogen atoms). Their electrochemical properties have been investigated between 2...
February 21, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28220915/modulation-of-the-co2-fixation-in-dinickel-azacryptands
#12
F Möller, L Castañeda-Losada, J R C Junqueira, R G Miller, M L Reback, B Mallick, M van Gastel, U-P Apfel
While bimetallic azacryptands are known to selectively coordinate CO2, there is little knowledge on how different substitution patterns of the azacryptand cage structure influence CO2 coordination. Stopped-flow UV-vis spectroscopy, electrochemical analysis and DFT calculations were performed on a series of dinickel azacryptands and showed different rates of CO2 coordination to the complexes. We herein present data showing that the different flexibility of the azacryptands is directly responsible for the difference in the CO2 uptake capability of dinickel azacryptand complexes...
February 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28220177/facile-synthesis-of-novel-bowl-like-hollow-carbon-spheres-by-the-combination-of-hydrothermal-carbonization-and-soft-templating
#13
Zili Zhang, Mingli Qin, Baorui Jia, Hongzhou Zhang, Haoyang Wu, Xuanhui Qu
For the first time, bowl-like hollow carbon spheres (BHCSs) have been designed and fabricated by the combination of hydrothermal carbonization and soft templating. The obtained BHCSs exhibit well-defined shapes with the size ranging from 1 to 2 μm. As electrodes of electrochemical double layer capacitors they showed good performance.
February 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28220176/chemical-routes-to-discharging-graphenides
#14
Stephen A Hodge, David J Buckley, Hin Chun Yau, Neal T Skipper, Christopher A Howard, Milo S P Shaffer
Chemical and electrochemical reduction methods allow the dispersion, processing, and/or functionalization of discrete sp(2)-hybridised nanocarbons, including fullerenes, nanotubes and graphenes. Electron transfer to the nanocarbon raises the Fermi energy, creating nanocarbon anions and thereby activating an array of possible covalent reactions. The Fermi level may then be partially or fully lowered by intended functionalization reactions, but in general, techniques are required to remove excess charge without inadvertent covalent reactions that potentially degrade the nanocarbon properties of interest...
February 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28220163/a-microneedle-biosensor-for-minimally-invasive-transdermal-detection-of-nerve-agents
#15
Rupesh K Mishra, A M Vinu Mohan, Fernando Soto, Robert Chrostowski, Joseph Wang
A microneedle electrochemical biosensor for the minimally invasive detection of organophosphate (OP) chemical agents is described. The new sensor relies on the coupling of the effective biocatalytic action of organophosphorus hydrolase (OPH) with a hollow-microneedle modified carbon-paste array electrode transducer, and involves rapid square-wave voltammetric (SWV) measurements of the p-nitrophenol product of the OPH enzymatic reaction in the presence of the OP substrate. The scanning-potential SWV transduction mode offers an additional dimension of selectivity compared to common fixed-potential OPH-amperometric biosensors...
February 21, 2017: Analyst
https://www.readbyqxmd.com/read/28220158/voltammetric-determination-of-diffusion-coefficients-in-polymer-membranes
#16
James B Sheppard, Bradley Hambly, Bradford Pendley, Erno Lindner
The diffusion-controlled transport of ions and molecules through polymer membranes utilized in chemical and biosensors is often the key factor determining the response characteristics of these sensors. In this paper, a simple voltammetric method is described for the determination of diffusion coefficients of redox molecules in resistive polymer membranes using a planar electrochemical cell (PEC) with a 5 μm radius carbon fiber as working electrode. In the proposed method, the diffusion coefficients are assessed from the scan rate dependence of the peak (or limiting) currents in linear sweep or cyclic voltammograms...
February 21, 2017: Analyst
https://www.readbyqxmd.com/read/28219246/dna-generated-electric-current-biosensor
#17
Lanshuang Hu, Shengqiang Hu, Linyan Guo, Congcong Shen, Minghui Yang, Avraham Rasooly
In addition to its primary function as a genetic material, deoxyribonucleic acid (DNA) is also a potential biologic energy source for molecular electronics. For the first time, we demonstrate that DNA can generate a redox electric current. As an example of this new functionality, DNA generated redox current was used for electrochemical detection of human epidermal growth factor receptor 2 (HER2), a clinically important breast cancer biomarker. To induce redox current, the phosphate of the single stranded DNA aptamer backbone was reacted with molybdate to form redox molybdophosphate precipitate and generate an electrochemical current of ∼16...
February 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28219237/physical-organic-approach-to-persistent-cyclable-low-potential-electrolytes-for-flow-battery-applications
#18
Christo S Sevov, David P Hickey, Monique E Cook, Sophia G Robinson, Shoshanna Barnett, Shelley D Minteer, Matthew S Sigman, Melanie S Sanford
The deployment of nonaqueous redox flow batteries for grid-scale energy storage has been impeded by a lack of electrolytes that undergo redox events at as low (anolyte) or high (catholyte) potentials as possible while exhibiting the stability and cycling lifetimes necessary for a battery device. Herein, we report a new approach to electrolyte design that uses physical organic tools for the predictive targeting of electrolytes that possess this combination of properties. We apply this approach to the identification of a new pyridinium-based anolyte that undergoes 1e(-) electrochemical charge-discharge cycling at low potential (-1...
February 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28219007/electrochemistry-of-the-4fe4s-cluster-in-base-excision-repair-proteins-tuning-the-redox-potential-with-dna
#19
Phillip Leon Bartels, Andy Zhou, Anna Ruth Arnold, Nicole N Nunez, Frank Nelson Crespilho, Sheila S David, Jacqueline K Barton
Escherichia coli Endonuclease III (EndoIII) and MutY are DNA glycosylases that contain [4Fe4S] clusters and that serve to maintain the integrity of the genome after oxidative stress. Electrochemical studies on highly-oriented pyrolytic graphite (HOPG) revealed that DNA binding by EndoIII leads to a large negative shift in midpoint potential of the cluster, consistent with stabilization of the oxidized [4Fe4S]3+ form. However, the smooth, hydrophobic HOPG surface is non-ideal for working with proteins in the absence of DNA...
February 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28218920/a-non-volatile-organic-electrochemical-device-as-a-low-voltage-artificial-synapse-for-neuromorphic-computing
#20
Yoeri van de Burgt, Ewout Lubberman, Elliot J Fuller, Scott T Keene, Grégorio C Faria, Sapan Agarwal, Matthew J Marinella, A Alec Talin, Alberto Salleo
The brain is capable of massively parallel information processing while consuming only ∼1-100 fJ per synaptic event. Inspired by the efficiency of the brain, CMOS-based neural architectures and memristors are being developed for pattern recognition and machine learning. However, the volatility, design complexity and high supply voltages for CMOS architectures, and the stochastic and energy-costly switching of memristors complicate the path to achieve the interconnectivity, information density, and energy efficiency of the brain using either approach...
February 20, 2017: Nature Materials
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