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Xiaoli Liu, Huan Liu, Xue Qu, Miao Lei, Chuchu Zhang, Hua Hong, Gregory F Payne, Changsheng Liu
Wound dressings play important roles in the management of wounds, and calcium cross-linked alginate (Ca(2+)-Alg) is a commonly used hydrogel that is adapted for wound treatment. However, conventional methods for fabricating Ca(2+)-Alg hydrogels can be tedious and difficult to control because of the rapid Ca(2+)-induced gelation of alginate. In this study, An electrodeposition method was used to rapidly and controllably fabricate Ca(2+)-Alg films for wound treatment. Several measures of film growth (e.g., thickness and mass) are shown to linearly correlate to the imposed charge transfer at the electrode...
August 19, 2017: Journal of Materials Science. Materials in Medicine
Mhamad Aly Moussawi, Nathalie Leclerc-Laronze, Sébastien Floquet, Pavel A Abramov, Maxim Nailyevich Sokolov, Stephane Cordier, Anne Ponchel, Eric Monflier, Herve Bricout, David Landy, Mohamed Haouas, Jerome Marrot, Emmanuel Cadot
Herein, we report on a three-component supramolecular hybrid system built from specific recognition processes involving a Dawson type polyoxometalate [P2W18O62](6-,) a cationic electron-rich cluster {[Ta6Br12(H6O)6]@2CD}(2+) and γ-cyclodextrin. Investigations of such a class of materials have been conducted using bottom-up approach by studying the specific interactions between -CD and both types of inorganic units. Their ability to interact has been investigated in the solid state by single-crystal X-ray diffraction and in solution using multinuclear NMR methods (including DOSY, EXSY and COSY), ESI-mass and UV-vis spectroscopies, electrochemistry and ITC experiments...
August 18, 2017: Journal of the American Chemical Society
Nathalie Camus, Nathalie Le Bris, Selbi Nuryyeva, Matthieu Chessé, David Esteban-Gómez, Carlos Platas-Iglesias, Raphaël Tripier, Mourad Elhabiri
The acid-base and copper(ii) coordination properties of three previously described cyclam derivatives are reported. Potentiometry, mass spectrometry, UV-vis absorption spectroscopy, electrochemistry and theoretical calculations were combined to investigate the protonation and binding properties of Bn-cyclam-EtOH (L1), oxo-cyclam-EtOH (L2) and oxo-Bn-cyclam-EtOH (L3). These three cyclams are C-functionalized by a hydroxyethyl pendant arm and display either one N-benzyl group and/or an amide replacing one macrocyclic secondary amine...
August 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Kyoung Ha Cha, Mark E Meyerhoff
The compatibility of nitric oxide (NO) release coatings with implantable enzymatic glucose sensors based on osmium (III/II) mediated electrochemical detection is examined for the first time. NO-releasing osmium-mediated glucose sensors are prepared using a S-nitrosothiol impregnated outer tubing and are tested in vitro in both phosphate buffer (pH 7.4) and within whole porcine blood. It is demonstrated that after 3 days of continuous NO release at or above physiological levels, there are no negative effects on the osmium mediated elec-trochemical currents...
August 18, 2017: ACS Sensors
Shuoyu Li, Yuyi Liu, Peisheng Guo, Chengxin Wang
Transitionmetal oxides nanoparticles capsuled in amorphous carbon nanotubes (ACNTs) are attractive anode materials of lithium ion batteries (LIBs). Here we firstly designed a fast and universal method with a hydromechanics conception which is called Marangoni flow to fabricating transition bimetal oxides (TBOs) in ACNTs composite with a better electrochemistry performance. Maragoni flows can produce a liquid column with several centimeters high in a tube with one side immersion in the liquid. The key point to induce a Marangoni flow is to make a gradient of the surface tension between the surface and the inside of the solution...
August 18, 2017: ACS Applied Materials & Interfaces
Feng Chen, Xuyao Wang, Xiaowen Cao, Yongxi Zhao
Circulating methylated DNA has been a new kind of cancer biomarker, yet its small fraction of trace total DNA from clinical samples impairs the accurate analysis. Though fluorescence methods based on quantitative methylation specific PCR (qMSP) have been adopted routinely, yet alternative electrochemistry assay of such DNA from clinical samples remains a great challenge. Herein, we report accurate electrochemistry analysis of circulating methylated DNA from clinical plasma samples based on a paired-end tagging and amplifications strategy...
August 16, 2017: Analytical Chemistry
Sara Drvarič Talian, Joze Moskon, Robert Dominko, Miran Gaberscek
Polysulfides are central compounds in lithium-sulfur battery cells. However, the fundamental redox and diffusion properties of polysulfides are still poorly understood. We try to fill this gap by performing accurate impedance spectroscopy investigation using symmetrical cells consisting from two planar glassy carbon electrodes separated with catholyte-soaked separator. The catholyte contains a mixture of selected polysulfides with predetermined nominal concentrations. Impedance measurements reveal textbook shapes of spectra for most polysulfide compounds or their mixtures...
August 15, 2017: ACS Applied Materials & Interfaces
Marjan Heidari, Bahareh Dabirmanesh, Hossein Mahdavi, Khosro Khajeh
Nowadays sensors and especially biosensors play an important role in medical diagnosis and detection of food and environment contaminations. Biosensors’ facilities have been improved significantly by using technologies such as surface plasmon resonance, microfluidics, laser, and electrochemistry. These technologies are now available on chips in micro- and nano-scale and are capable of measuring the quantity of more than one analyte at once. One branch of these sensors is the holographic (bio)sensor. Reflection holographic sensors, which are optical devices fabricated based on Bragg’s law, can diffract light with specific wavelength as they absorb or release special ions or molecule depending on their polymer structure...
August 15, 2017: Iranian Biomedical Journal
Vikram Singh, Yujiao Zhang, Linping Yang, Pengtao Ma, Dongdi Zhang, Chao Zhang, Li Yu, Jingyang Niu, Jingping Wang
Two novel heteropolyoxomolybdate [XMo₈O31](n-) (X = Ge(1) or P(2)) manganese carbonyl derivatives [(CH₃)₄N]₆H₆{Mn(II)(GeMo₈O31)[Mn(I)(CO)₃]₂}₂·12H₂O (1) and [(CH₃)₄N]₄H₆{Mn(II)(PMo₈O31)[Mn(I)(CO)₃]₂}₂·14H₂O (2), have been successfully synthesized and characterized in the solid state by single crystal X-ray diffraction, IR and thermogravimetric analysis, and in solution by UV-Vis spectroscopy and electrochemistry. The two polyoxomolybdate-based organometallic compounds 1 and 2 represent rare examples of transition metal sandwich-based polyoxometalate metal carbonyl derivatives (PMCDs), in which the organic-inorganic hybrids are composed of four Mn(CO)₃⁺ groups symmetrically occupied the tetravacant sites of dimeric heteropolyoxomolybdate {Mn₂(XMo₈O31)₂}(n-) through Mn(I)-O-Mo bonds...
August 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Hope Adamson, Alan M Bond, Alison Parkin
Biological electron-exchange reactions are fundamental to life on earth. Redox reactions underpin respiration, photosynthesis, molecular biosynthesis, cell signalling and protein folding. Chemical, biomedical and future energy technology developments are also inspired by these natural electron transfer processes. Further developments in techniques and data analysis are required to gain a deeper understanding of the redox biochemistry processes that power Nature. This review outlines the new insights gained from developing Fourier transformed ac voltammetry as a tool for protein film electrochemistry...
August 14, 2017: Chemical Communications: Chem Comm
Alain Walcarius
The past decade has seen an increasing number of extensive studies devoted to the exploitation of ordered mesoporous carbon (OMC) materials in electrochemistry, notably in the fields of energy and sensing. The present review summarizes the recent achievements made in field of electroanalysis using electrodes modified with such nanomaterials. On the basis of comprehensive tables, the interest in OMC for designing electrochemical sensors is illustrated through the various applications developed to date. They include voltammetric detection after preconcentration, electrocatalysis (intrinsically due to OMC or based on suitable catalysts deposited onto OMC), electrochemical biosensors, as well as electrochemiluminescence and potentiometric sensors...
August 11, 2017: Sensors
Shi Chen, Tao He, Yuefeng Su, Yun Lu, Liying Bao, Lai Chen, Qiyu Zhang, Jing Wang, Renjie Chen, Feng Wu
Ni-rich materials are appealing to replace LiCoO2 as cathodes in Li-ion batteries due to their low cost and high capacity. However, there are also some disadvantages for Ni-rich cathode materials such as poor cycling and rate performance, especially under high voltage. Here, we demonstrate the effect of dual-conductive layers composed of Li3PO4 and PPy for layered Ni-rich cathode material. Fourier Transform Infrared Spectroscopy and X-ray photoelectron spectroscopy show that the coating layers are composed of Li3PO4 and PPy...
August 11, 2017: ACS Applied Materials & Interfaces
Rongbin Zhang, Biao Du, Lichang Yin, Yuanquan Miao, Jianxin Cai, Gang Feng, Xuewen Wang
ZnS is widely used as a semiconductor photocatalyst in photo-electrochemical water splitting and photodegradation under ultraviolet (UV)-light irradiation. In this work, Molybdenum (Mo)-doped ZnS sheets with dominant {111} facets are developed using a hydrothermal method with Mo ions as precursors to realize non-visible-light photocatalytic activity and reduce the recombination rate of photoexcited carriers in ZnS. Mo ions are found to play a key role in the growth process of the sheet-like structure. Mo-dopants in the ZnS sheets introduce the acceptor energy levels among the bandgaps...
August 2, 2017: Journal of Colloid and Interface Science
Dengchao Wang, Michael V Mirkin
Coating the inner wall of a quartz nanopipette with a thin layer of carbon yields a nanopore with the tunable surface charge and chemical state for resistive-pulse and rectification sensing. Herein we report the experimental study and modeling of the electron-transfer gated ion transport processes in carbon nanopipettes. The potential of the unbiased carbon layer can be tuned by adding very low (sub-nM) concentrations of redox species to the solution via bipolar electrochemistry. The potential of carbon determines the electrical double layer structure that, in turn, affects the ionic transport processes...
August 11, 2017: Journal of the American Chemical Society
Kevin Klunder, Zach Nilsson, Justin Sambur, Charles S Henry
Since their invention in the 1950's, composite carbon electrodes have been employed in a wide variety of applications, ranging from batteries and fuel cells to chemical sensors because they are easy to make and pattern at millimeter scales. Despite their widespread use, traditional carbon composite electrodes have substandard electrochemistry relative to metallic and glassy carbon electrodes. As a result, there is a critical need for new composite carbon electrodes that are highly electrochemically active, have universal and easy fabrication into complex geometries, are highly conductive, and are low cost...
August 10, 2017: Journal of the American Chemical Society
Tile Gieshoff, Anton Kehl, Dieter Schollmeyer, Kevin D Moeller, Siegfried R R Waldvogel
The electrochemical synthesis of pyrazolidine-3,5-diones and benzoxazoles by N-N bond formation and C,O linkage respectively represents an easy access to medicinally relevant structures. Electrochemistry as key technology ensures a safe and sustainable approach. We gained insights in the mechanism of these reactions by combining cyclovoltammet-ric and synthetic studies. The electron transfer behavior of anilides and dianilides was studied and led to the following conclusion: The N-N bond formation involves a diradical as intermediate, whereas the benzoxazole formation is based on a cationic mechanism...
August 9, 2017: Journal of the American Chemical Society
Jayoung Kim, Itthipon Jeerapan, Bianca Ciui, Martin C Hartel, Aida Martin, Joseph Wang
This study demonstrates the first example of completely food-based edible electrochemical sensors. The new edible composite electrodes consist of food materials and supplements serving as the edible conductor, corn, and olive oils as edible binders, vegetables as biocatalysts, and food-based packing sleeves. These edible composite electrodes are systematically characterized for their attractive electrochemical properties, such as potential window, capacitance, redox activity using various electrochemical techniques...
August 7, 2017: Advanced Healthcare Materials
Ankita Saini, K R Justin Thomas, Abhay Sachdev, Packrisamy Gopinath
A series of 1,8-naphthalimide-based fluorophores containing different chromophores with varying conjugation and electron richness at imidic nitrogen are synthesized and characterized. These amine-functionalized naphthalimides are bipolar in nature and exhibit interesting optical and morphological variations attributable to the nature of N-substituents. Despite the dyes are structurally different due to the substituent variation in the imidic nitrogen, their electronic characteristics are similar originating from the 4-aminonaphthalimide segment...
August 7, 2017: Chemistry, An Asian Journal
Enrico Berretti, Andrea Giaccherini, Stefano M Martinuzzi, Massimo Innocenti, Thomas J S Schubert, Frank M Stiemke, Stefano Caporali
Since their discovery, ionic liquids (ILs) have attracted a wide interest for their potential use as a medium for many chemical processes, in particular electrochemistry. As electrochemical media they allow the electrodeposition of elements that are impossible to reduce in aqueous media. We have investigated the electrodeposition of aluminium from 1-butyl-3-methyl-imidazolium chloride ((Bmim)Cl)/AlCl₃ (40/60 mol %) as concerns the effect of deposition parameters on the quality of the deposits. Thick (20 μm) aluminium coatings were electrodeposited on brass substrates at different temperatures and mixing conditions (mechanical stirring and sonication)...
August 24, 2016: Materials
Xingde Xiang, Fang Zhang, Wanfeng Li, Molong Sun
Aqueous sodium-ion batteries (SIBs) represent a class of green electrochemical technology for large-scale storage of sustainable energies such as wind power and solar radiation, owing to the low cost, environmental friendliness and reliable safety. However, there is still lack of available anode materials for aqueous SIBs. Herein, we report nanocrystal-assembled porous Na3MgTi(PO4)3 aggregates as novel anode material for aqueous SIBs. The crystal structure, morphological feature and electrochemical properties have been analyzed with X-ray diffraction, scanning electron microscope, transition electron microscope, cyclic voltammetry, and charge/discharge measurements...
August 3, 2017: Chemistry: a European Journal
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