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Yanbiao Liu, Fang Li, Qin Xia, Jiawei Wu, Jianshe Liu, Mingzhi Huang, Jianping Xie
Effective, affordable and low energy water purification technologies are highly desirable to address the current environmental issues. In this study, we developed a low-cost method to achieve efficient organic pollutants degradation by incorporating conductive nanomaterials (i.e., carbon nanotubes, CNTs) to assist electro-oxidation, leading to an efficient conductive nano-sponge filtration device. The integration of electrochemistry has significantly improved the performance of the sponge-based device to adsorb and oxidize organic compounds in aqueous solution...
February 22, 2018: Nanoscale
Thummavichai Kunyapat, Fang Xu, Nigle Neate, Nannan Wang, Adolfo De Sanctis, Saverio Russo, Shaowei Zhang, Yongda Xia, Yanqiu Zhu
Cerium (Ce)-doped tungsten oxide nanostructures were synthesised using a simple solvothermal method from cerium chloride salt (CeCl3 ·7H2 O) and tungsten hexachloride (WCl6 ) precursors. The as-prepared samples were thoroughly characterised using electron microscopies, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The electrochromic performance of different samples was evaluated using a custom-built UV-VIS spectrometer and an electrochemistry technique. The results showed that the as-prepared samples underwent morphological evolution with the increase in the Ce/W molar ratio, from long, thin and bundled nanowires, through shorter and thicker nanowires to mixed nanowire bundles and nanoparticle agglomerates...
February 21, 2018: Nanoscale
Benjamin E Olafsen, Giuseppe V Crescenzo, Luke P Moisey, Brian O Patrick, Kevin M Smith
Known stable [Cr(bpy)2 (Ph)2 ](BPh4 ) complexes undergo reductive elimination of biphenyl with visible-light photolysis using household incandescent or compact fluorescent light bulbs. A series of [Cr(R-bpy)2 (Ar)2 ](X) complexes (R = H or CMe3 ; Ar = Ph, C6 H4 -CMe3 , or C6 H4 -OMe; X = I, BPh4 , or PF6 ) were prepared, and the effect of varying the bipyridine and aryl ligands on the UV-visible spectra and electrochemistry of the chromium(III) complexes was investigated. Photolysis of a mixture of two different bis(aryl) complexes gave only the homocoupled biaryl products by1 H NMR and gas chromatography/mass spectrometry analysis...
February 20, 2018: Inorganic Chemistry
Dessi A Koleva
The corrosion of reinforced steel, and subsequent reinforced concrete degradation, is a major concern for infrastructure durability. New materials with specific, tailor-made properties or the establishment of optimum construction regimes are among the many approaches to improving civil structure performance. Ideally, novel materials would carry self-repairing or self-healing capacities, triggered in the event of detrimental influence and/or damage. Controlling or altering a material's behavior at the nano-level would result in traditional materials with radically enhanced properties...
February 20, 2018: Materials
Abhishek Lahiri, Maryam Shapouri Ghazvini, Giridhar Pulletikurthi, Tong Cui, Volker Klemm, David Rafaja, Frank Endres
In electrochemistry, the electrode/electrolyte interface (EEI) governs the charge/mass transfer processes and controls the nucleation/growth phenomena. The EEI in ionic liquids (IL) can be controlled by changing the cation/anion of the IL, salt concentration, electrode potential and temperature. In this paper, we show that adding a dopant salt leads to the deposition of nanowires. To illustrate, zinc nanowires were electrodeposited from ZnCl2/1-butyl-1-methylpyrrolidinium trifluoromethylsulfonate in presence of GaCl3 as a dopant salt...
February 19, 2018: Journal of Physical Chemistry Letters
Lisa M Housel, Lei Wang, Alyson Abraham, Jianping Huang, Genesis D Renderos, Calvin D Quilty, Alexander B Brady, Amy C Marschilok, Kenneth J Takeuchi, Esther S Takeuchi
Future advances in energy storage systems rely on identification of appropriate target materials and deliberate synthesis of the target materials with control of their physiochemical properties in order to disentangle the contributions of distinct properties to the functional electrochemistry. This goal demands systematic inquiry using model materials that provide the opportunity for significant synthetic versatility and control. Ideally, a material family that enables direct manipulation of characteristics including composition, defects, and crystallite size while remaining within the defined structural framework would be necessary...
February 19, 2018: Accounts of Chemical Research
Tessema F Mekonnen, Ulrich Panne, Matthias Koch
Biotransformation processes of fluopyram (FLP), a new succinate dehydrogenase inhibitor (SDHI) fungicide, were investigated by electrochemistry (EC) coupled online to liquid chromatography (LC) and electrospray mass spectrometry (ESI-MS). Oxidative phase I metabolite production was achieved using an electrochemical flow-through cell equipped with a boron-doped diamond (BDD) electrode. Structural elucidation and prediction of oxidative metabolism pathways were assured by retention time, isotopic patterns, fragmentation, and accurate mass measurements using EC/LC/MS, LC-MS/MS, and/or high-resolution mass spectrometry (HRMS)...
February 17, 2018: Analytical and Bioanalytical Chemistry
Pan Liu, Jiuhui Han, Xianwei Guo, Yoshikazu Ito, Chuchu Yang, Shoucong Ning, Takeshi Fujita, Akihiko Hirata, Mingwei Chen
Rechargeable non-aqueous lithium-oxygen batteries with a large theoretical capacity are emerging as a high-energy electrochemical device for sustainable energy strategy. Despite many efforts made to understand the fundamental Li-O 2 electrochemistry, the kinetic process of cathodic reactions, associated with the formation and decomposition of a solid Li 2 O 2 phase during charging and discharging, remains debate. Here we report direct visualization of the charge/discharge reactions on a gold cathode in a non-aqueous lithium-oxygen micro-battery using liquid-cell aberration-corrected scanning transmission electron microscopy (STEM) combining with synchronized electrochemical measurements...
February 16, 2018: Scientific Reports
Dandan Yuan, Lei Tian, Zhida Li, Hong Jiang, Chao Yan, Jing Dong, Hongjun Wu, Baohui Wang
Herein, we report the solar thermal electrochemical process (STEP) aniline oxidation in wastewater for totally solving the two key obstacles of the huge energy consumption and passivation film in the electrochemical treatment. The process, fully driven by solar energy without input of any other energies, sustainably serves as an efficient thermoelectrochemical oxidation of aniline by the control of the thermochemical and electrochemical coordination. The thermocoupled electrochemical oxidation of aniline achieved a fast rate and high efficiency for the full minimization of aniline to CO 2 with the stability of the electrode and without formation of polyaniline (PAN) passivation film...
February 15, 2018: Scientific Reports
Ana-Maria Chiorcea-Paquim, Teodor Adrian Enache, Ana Maria Oliveira-Brett
Alzheimer's disease (AD) is a widespread form of dementia that is estimated to affect 44.4 million people worldwide. AD pathology is closely related to the accumulation of amyloid beta (Aβ) peptides in fibrils and plagues, the small oligomeric intermediate species formed during the Aβ peptides aggregation presenting the highest neurotoxicity. This review discusses the recent advances on the Aβ peptides electrochemical characterisation. The Aβ peptides oxidation at a glassy carbon electrode occurs in one or two steps, depending on the amino acid sequence, length and content...
February 13, 2018: Current Medicinal Chemistry
A K M Kafi, C C L Yam, N S Azmi, Mashitah M Yusoff
In this work, the direct electrochemistry of hemoglobin (Hb), which was immobilized on carbonyl functionalized single walled carbon nanotube (SWCNT) and deposited onto a gold (Au) electrode has been described. The synthesis of the network of crosslinked SWCNT/Hb was done with the help of crosslinking agent EDC (1-ethyl-3-(3-dimethylaminopropyl) carbodiimide). The UV-Vis and FTIR spectroscopy of SWCNT/Hb networks showed that Hb maintained its natural structure and kept good stability. In addition with this, scanning electron microscopy (SEM) illustrated that SWCNT/Hb networks had a featured layered structure and Hb being strongly liked with SWCNT surface...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Jiaying Xin, Boxin Dou, Zhenxing Wang, Yan Wang, Chungu Xia, Zhongfan Liu
Mathanobatins (Mb, Mbtins) were immobilized successfully on nanometer-sized gold colloid particles associated with β-mercaptoethylamine. The structures of Mb functionalized gold nanoparticles were characterized and confirmed by UV-vis spectroscopy (UV-vis), FTIR spectra and electrochemical analyses. Direct electron transfer between Mb or copper-loading Mbtins and the modified electrode was investigated without the aid of any electron mediator. The copper-loading Mbtins act as a better electrocatalyst for the reduction of H2O2 than Mb...
July 1, 2018: Journal of Nanoscience and Nanotechnology
Miquel Navarro, Christene Smith, Mo Li, Stefan Bernhard, Martin Albrecht
The synthetic versatility of PYA ligands has been exploited to prepare and evaluate a diverging series of iridium complexes containing C,N-bidentate chelating aryl-PYA ligands for water oxidation catalysis. The phenyl-PYA lead structure was modified (i) electronically through introduction of one, two, or three electron-donating methoxy substituents on the aryl ring, (ii) by incorporating long aliphatic chains to the pyridyl fragment of the PYA unit, and (iii) by altering the PYA positions from para-PYA to its ortho- and meta-isomers...
February 14, 2018: Chemistry: a European Journal
Chunyu Ru, Zhenhua Li, Chengji Zhao, Yuting Duan, Zhuang Zhuang, Fanzhe Bu, Hui Na
Novel side-chain-type sulfonated poly (arylene ether ketone) (SNF-PAEK) containing naphthalene and fluorine moieties on the main chain was prepared in this work, and a new amino-sulfo-bifunctionalized metal-organic framework (MNS, short for MIL-101-NH2-SO3H) was synthesized via a hydrothermal technology and post-modification. Then MNS was incorporated into SNF-PAEK matrix as an inorganic nano-filler to prepare a series of organic-inorganic hybrid membranes (MNS@SNF-PAEK-XX). The mechanical property, methanol resistance, electrochemistry and other properties of MNS@SNF-PAEK-XX hybrid membranes were detailed characterized...
February 14, 2018: ACS Applied Materials & Interfaces
Namita Shrestha, Govinda Chilkoor, Bhuvan Vemuri, Navanietha Rathinam, Rajesh K Sani, Venkataramana Gadhamshetty
Extremophiles, notably archaea and bacteria, offer a good platform for treating industrial waste streams that were previously perceived as hostile to the model organisms in microbial electrochemical systems (MESs). Here we present a critical overview of the fundamental and applied biology aspects of halophiles and thermophiles in MESs. The current study suggests that extremophiles enable the MES operations under a seemingly harsh conditions imposed by the physical (pressure, radiation, and temperature) and geochemical extremes (oxygen levels, pH, and salinity)...
February 2, 2018: Bioresource Technology
W M Dose, M J Piernas-Muñoz, V A Maroni, S E Trask, I Bloom, C S Johnson
A silicon-graphite blended anode is paired with a high capacity LiFePO4 reference/counter electrode to track irreversibility and lithium inventory. The LiFePO4 electrode provides a reliable, flat potential for dQ dV-1 analysis of LixSi and LixC electrochemical reactions. We relate this electrochemistry to the morphological and physical changes taking place.
February 12, 2018: Chemical Communications: Chem Comm
Piero Zanello
In the context of the plethora of proteins harboring iron-sulfur clusters we have already reviewed structure/electrochemistry of metalloproteins expressing single types of iron-sulfur clusters (namely: {Fe(Cys)4}, { [Fe2S2](Cys)4}, { [Fe2S2](Cys)3(X)} (X = Asp, Arg, His), { [Fe2S2](Cys)2(His)2}, { [Fe3S4](Cys)3}, { [Fe4S4](Cys)4} and { [Fe4S4](SγCys)3(nonthiolate ligand) } cores) and their synthetic analogs. More recently we are focussing on structure/electrochemistry of metalloproteins harboring iron-sulfur centres of different nuclearities...
February 8, 2018: Journal of Structural Biology
Meng-Jiao Zhu, Jian-Bin Pan, Zeng-Qiang Wu, Xiao-Yu Gao, Wei Zhao, Xing-Hua Xia, Jing-Juan Xu, Hong-Yuan Chen
Noble metal nanoparticles are promising catalysts in electrochemical reactions, while understanding the relationship between the structure and reactivity of the particles is important to achieve higher efficiency of electrocatalysis, and promote the development of single-molecule electrochemistry. Herein, we employ electrogenerated chemiluminescence (ECL) to image the catalytic oxidation of luminophore at single Au, Pt and Au-Pt Janus nanoparticles. Compared to monometal, the Janus particle structure exhibited enhanced ECL intensity and stability, indicating better catalytic efficiency...
February 8, 2018: Angewandte Chemie
Mimi Shin, Jeffrey M Copeland, B Jill Venton
Drosophila melanogaster, the fruit fly, is an important, simple model organism for studying the effects of genetic mutations on neuronal activity and behavior. Biologists use Drosophila for neuroscience studies because of its genetic tractability, complex behaviors, well-known and simple neuroanatomy, and many orthologs to human genes. Neurochemical measurements in Drosophila are challenging due to the small size of the central nervous system. Recently, methods have been developed to measure real-time neurotransmitter release and clearance in both larvae and adults using electrochemistry...
February 7, 2018: ACS Chemical Neuroscience
Ke-Yin Ye, Gisselle Pombar, Niankai Fu, Gregory S Sauer, Ivan Keresztes, Song Lin
The emergence of new catalytic strategies that cleverly adopt concepts and techniques frequently used in areas such as photochemistry and electrochemistry has yielded myriad new organic reactions that would be challenging to achieve using orthodox methods. Herein, we discuss the strategic use of anodically coupled electrolysis, an electrochemical process that combines two parallel oxidative events, as a complementary approach to existing methods for redox organic transformations. Specifically, we demonstrate anodically coupled electrolysis in the regio- and chemoselective chlorotrifluoromethylation of alkenes...
February 6, 2018: Journal of the American Chemical Society
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