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https://www.readbyqxmd.com/read/28212031/bond-activation-and-hydrogen-evolution-from-water-through-reactions-with-m3s4-m-mo-w-and-w3s3-anionic-clusters
#1
Corrine A Kumar, Arjun Saha, Krishnan Raghavachari
Transition metal sulfides (TMS) are being investigated with increased frequency because of their ability to efficiently catalyze the hydrogen evolution reaction. We have studied the trimetallic TMS cluster ions, Mo3S4(-), W3S4(-), and W3S3(-), and probed their efficiency for bond activation and hydrogen evolution from water. These clusters have geometries that are related to the edge sites on bulk MoS2 surfaces that are known to play a role in hydrogen evolution. Using density functional theory, the electronic structures of these clusters and their chemical reactivity with water have been investigated...
February 17, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28212011/a-fluorescent-anionic-mof-with-zn4-trz-2-chain-for-highly-selective-visual-sensing-of-contaminants-cr-iii-ion-and-tnp
#2
Xiao-Xia Jia, Ru-Xin Yao, Fu-Qiang Zhang, Xian-Ming Zhang
Heavy-metal ions and nitroaromatic substances are highly toxic and harmful to human health and the ecological environment. It is an urgent issue to selectively detect and capture these toxic substances. By introducing the triazole ligand to the π-conjugated aromatic carboxylate system and borrowing the organic template open framework idea, a stable fluorescent framework [Me2NH2]4[Zn6(qptc)3(trz)4]·6H2O (1) (H4qptc = terphenyl-2,5,2'5'-tetracarboxylic acid, trz = 1,2,4-triazole) has been successfully synthesized, which features Zn4(trz)2 chain-based 3D anionic structure with channels filled by [Me2NH2](+) cations...
February 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28211996/alternating-current-electrophoretic-deposition-for-the-immobilization-of-antimicrobial-agents-on-titanium-implant-surfaces
#3
Annabel Braem, Katrijn De Brucker, Nicolas Delattin, Manuela Sonja Killian, Maarten B J Roeffaers, Tomohiko Yoshioka, Satoshi Hayakawa, Patrik Schmuki, Bruno P A Cammue, Sannakaisa Virtanen, Karin Thevissen, Bram Neirinck
One prominent cause of implant failure is infection, therefore research is focusing on developing surface coatings that render the surface resistant to colonization by micro-organisms. Permanently attached coatings of antimicrobial molecules are of particular interest because of the reduced cytoxicity and lower risk of developing resistance compared to controlled release coatings. In this study, we focus on the chemical grafting of bioactive molecules on titanium. To concentrate the molecules at the metallic implant surface, we propose electrophoretic deposition (EPD) applying alternating current (AC) signals with an asymmetrical wave shape...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211688/functionalized-triptycene-derived-tripodal-ligands-privileged-formation-of-tetranuclear-cage-assemblies-with-larger-ln-iii
#4
Alexandra Vuillamy, Soumaila Zebret, Céline Besnard, Virginie Placide, Stéphane Petoud, Josef Hamacek
In this Article, we report the self-assembly of lanthanide complexes formed with two new tripodal ligands, L2 and L3, where binding strands are connected to a rigid triptycene anchor. The pyridine moieties are functionalized with methoxy and PEG groups to enhance ligand solubility and to evaluate the effect of these substituents on lanthanide coordination. These ligands were successfully synthesized and characterized, and their coordination properties were examined along the lanthanide series through speciation studies with NMR and ESI-MS...
February 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28211670/facile-synthesis-of-unique-hexagonal-nanoplates-of-zn-co-hydroxy-sulfate-for-efficient-electrocatalytic-oxygen-evolution-reaction
#5
Soumen Dutta, Chaiti Ray, Yuichi Negishi, Tarasankar Pal
Cost-effective, highly active water oxidation catalysts are becoming increasingly demanding in the field of energy conversion and storage. Herein, simple modified hydrothermally (MHT) synthesized zinc and cobalt based hydroxyl double salt i.e., Zn4-xCoxSO4(OH)6• 0.5 H2O (ZCS) has been exfoliated for the first time as an efficient electrocatalyst for oxygen evolution reaction (OER) in alkaline medium. Morphology investigation suggests the evolution of unique hexagonal nanoplates of ZCS material. As OER catalyst, it requires only 370 and 450 mV overpotential to achieve 10 and 100 mA cm-2 current density respectively...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211359/electrodeposition-of-wo3-nanoparticles-into-surface-mounted-metal-organic-framework-hkust-1-thin-films
#6
Hyeonseok Yoo, Alexander Welle, Wei Guo, Jinsub Choi, Engelbert Redel
We describe a novel procedure to fabricate WO3@surface-mounted metal-organic framework (SURMOF) hybrid materials by electrodeposition of WO3 nanoparticles into HKUST-1, also termed Cu3(BTC)2 SURMOFs. These materials have been characterized using x-ray diffraction, time-of-flight secondary ion mass spectrometry, scanning electron microscopy, x-ray photoelectron spectroscopy as well as linear sweep voltammetry. The WO3 semiconductor/SURMOF heterostructures were further tested as hybrid electrodes in their performance for hydrogen evolution reaction from water...
March 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28211330/biosorption-and-biomineralization-of-uranium-vi-by-saccharomyces-cerevisiae-crystal-formation-of-chernikovite
#7
Xin-Yan Zheng, Xiao-Yu Wang, Yang-Hao Shen, Xia Lu, Tie-Shan Wang
Biosorption of heavy metal elements including radionuclides by microorganisms is a promising and effective method for the remediation of the contaminated places. The responses of live Saccharomyces cerevisiae in the toxic uranium solutions during the biosorption process and the mechanism of uranium biomineralization by cells were investigated in the present study. A novel experimental phenomenon that uranium concentrations have negative correlation with pH values and positive correlation with phosphate concentrations in the supernatant was observed, indicating that hydrogen ions, phosphate ions and uranyl ions were involved in the chernikovite precipitation actively...
February 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28211307/local-and-systemic-changes-associated-with-long-term-percutaneous-static-implantation-of-titanium-alloys-in-rhesus-macaques-macaca-mulatta
#8
Galit H Frydman Robert P Marini Vasudevan Bakthavatchalu Kathleen E Biddle Sureshkumar Muthupalani Charles R Vanderburg Barry Lai Pavan K Bendapudi Ronald G Tompkins And James G Fox
Metal alloys are frequently used as implant materials in veterinary medicine. Recent studies suggest that many alloys induce both local and systemic inflammatory responses. In this study, 37 rhesus macaques with long-term skull-anchored percutaneous titanium alloy implants (duration, 0 to 14 y) were evaluated for changes in their hematology, coagulation, and serum chemistry profiles. Negative controls (n = 28) did not have implants. Macaques with implants had higher plasma D-dimer and lower antithrombin III concentrations than nonimplanted animals...
February 16, 2017: Comparative Medicine
https://www.readbyqxmd.com/read/28211269/phosphorus-based-alloy-materials-for-advanced-potassium-ion-battery-anode
#9
Wenchao Zhang, Jianfeng Mao, Sean Li, Zhixin Chen, Zaiping Guo
Potassium-ion batteries (PIBs) are interesting as one of the alternative metal-ion battery systems to lithium-ion batteries (LIBs) due to the abundance and low cost of potassium. We have herein investigated Sn4P3/C composite as a novel anode material for PIBs. The electrode delivered a reversible capacity of 384.8 mA h g-1 at 50 mA g-1 and a good rate capability of 221.9 mA h g-1, even at 1 A g-1. Its electrochemical performance is better than any anode material reported so far for PIBs. It was also found that the Sn4P3/C electrode displays a discharge potential plateau of 0...
February 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28208304/boric-acid-functional-lanthanide-metal-organic-frameworks-for-selective-ratiometric-fluorescence-detection-of-fluoride-ions
#10
Zhong-Rui Yang, Man-Man Wang, Xue-Sheng Wang, Xue-Bo Yin
Here, we report that boric acid is used to tune the optical properties of lanthanide metal-organic frameworks (LMOFs) for dual-fluorescence emission and improves the selectivity of LMOFs for the determination of F(-) ions. The LMOFs are prepared with 5-boronoisophthalic acid (5-bop) and Eu(3+) ions as the precursors. Emission mechanism study indicates that 5-bop is excited with UV photons to produce its triplet state, which then excites Eu(3+) ions for their red emission. This is the general story of the antenna effect, but electron-deficient boric acid decreases the energy transfer efficiency from the triplet state of 5-bop to Eu(3+) ions, so dual emission from both 5-bop and Eu(3+) ions is efficiently excited at the single excitation of 275 nm...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28208297/label-free-lspr-detection-of-trace-lead-ii-ions-in-drinking-water-by-synthetic-poly-mpd-co-asa-nanoparticles-on-gold-nanoislands
#11
Guangyu Qiu, Siu Pang Ng, Xiongyi Liang, Ning Ding, Xiangfeng Chen, Chi-Man Lawrence Wu
Using self-assembly gold nanoislands (SAM-AuNIs) functionalized by poly(m-phenylenediamine-co-aniline-2-sulfonic acid) (poly(mPD-co-ASA)) copolymer nanoparticles as specific receptors, a highly sensitive localized surface plasmon resonance (LSPR) optochemical sensor is demonstrated for detection of trace lead cation (Pb(II)) in drinking water. The copolymer receptor is optimized in three aspects: (1) mole ratio of mPD:ASA monomers, (2) size of copolymer nanoparticles, and (3) surface density of the copolymer...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28208274/direct-trace-element-analysis-of-liquid-blood-samples-by-in-air-ion-beam-analytical-techniques-pixe-pige
#12
Robert Huszank, László Csedreki, Zsófia Török
There are various liquid materials whose elemental composition is of interest in various fields of science and technology. In many cases, sample preparation or the extraction can be complicated, or it would destroy the original environment before the analysis (for example, in the case of biological samples). However, multielement direct analysis of liquid samples can be realized by an external PIXE-PIGE measurement system. Particle-induced X-ray and gamma-ray emission spectroscopy (PIXE, PIGE) techniques were applied in external (in-air) microbeam configuration for the trace and main element determination of liquid samples...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28208265/effect-of-nanoemitters-on-suppressing-the-formation-of-metal-adduct-ions-in-electrospray-ionization-mass-spectrometry
#13
Jun Hu, Qi-Yuan Guan, Jiang Wang, Xiao-Xiao Jiang, Zeng-Qiang Wu, Xing-Hua Xia, Jing-Juan Xu, Hong-Yuan Chen
In the work, we showed that the use of nanoemitters (tip dimension <1 μm, typically ∼100 nm) could dramatically reduce the nonspecific metal adduction to peptide or protein ions as well as improve the matrix tolerance of electrospray ionization mass spectrometry (ESI-MS). The proton-enriched smaller initial droplets are supposed to have played a significant role in suppressing the formation of metal adduct ions in nanoemitters. The proton-enrichment effect in the nanoemitters is related to both the exclusion-enrichment effect (EEE) and the ion concentration polarization effect (ICP effect), which permit the molecular ions to be regulated to protonated ones...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28207866/a-novel-mechanism-of-metal-gel-shift-by-histidine-rich-ni2-binding-hpn-protein-from-helicobacter-pylori-strain-ss1
#14
Rahul Mahadev Shelake, Yuki Ito, Junya Masumoto, Eugene Hayato Morita, Hidenori Hayashi
Sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) is a universally used method for determining approximate molecular weight (MW) in protein research. Migration of protein that does not correlate with formula MW, termed "gel shifting" appears to be common for histidine-rich proteins but not yet studied in detail. We investigated "gel shifting" in Ni2+-binding histidine-rich Hpn protein cloned from Helicobacter pylori strain SS1. Our data demonstrate two important factors determining "gel shifting" of Hpn, polyacrylamide-gel concentration and metal binding...
2017: PloS One
https://www.readbyqxmd.com/read/28207241/zero-thermal-expansion-and-semiconducting-properties-in-pbtio3-bi-co-ti-o3-ferroelectric-solid-solutions
#15
Zhao Pan, Jun Chen, Xingxing Jiang, Zheshuai Lin, Linxing Zhang, Longlong Fan, Yangchun Rong, Lei Hu, Hui Liu, Yang Ren, Xiaojun Kuang, Xianran Xing
Zero thermal expansion (ZTE) behavior is rare but important for both fundamental studies and practical applications of functional materials. Until now, most available ZTE materials are either electrical insulating oxides or conductive metallic compounds. Very few ZTE materials exhibit the semiconductor feature. Here we report a ZTE in a semiconducting ferroelectric of 0.6PbTiO3-0.4Bi(Co0.55Ti0.45)O3-δ. Its unit cell volume exhibits a negligible change over a broad temperature range from room temperature to 500 °C...
February 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28207181/effect-of-the-metal-ion-on-the-enantioselectivity-and-linkage-isomerization-of-thiosemicarbazone-helicates
#16
Ana M González-Noya, María J Romero, Vanesa Suárez, Sandra Fernández-Fariña, Marcelino Maneiro, Emilio Martínez-Núñez, Guillermo Zaragoza, Rosa Pedrido
The effect of the metal ion and ligand design on the enantioselectivity and linkage isomerization of neutral cobalt and zinc bisthiosemicarbazone metallohelicates has been investigated in this work. The electrochemical synthesis has afforded the enantioselective formation of chiral pure cobalt helicates, and the  isomer of a single enantiomer has been crystallized as only product for the cobalt methyl-substituted thiosemicarbazone helicate. Interestingly linkage isomers have been isolated from zinc ethyl-substituted thiosemicarbazone helicate enantiomers for the first time...
February 16, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28206743/electrodeposited-na2vox-fe-cn-6-films-as-a-cathode-material-for-aqueous-na-ion-batteries
#17
Bianca Paulitsch, Jeongsik Yun, Aliaksandr S Bandarenka
The so-called Prussian Blue Analogues (PBAs) are spotlighted as promising cathode materials for aqueous Na-ion batteries regarding their good performance for the application in future large scale energy storage systems. In this work, we demonstrate that one of the PBA representatives, namely Na2VOx[Fe(CN)6] thin films (VHCFs), is a promising cathode material for aqueous Na-ion batteries with very positive intercalation/de-intercalation potentials, which might likely designate a new benchmark in the field. In order to maximize the material utilization, we have formed VHCF thin films on model current collectors from aqueous solutions...
February 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28205587/nickel-biopathways-in-tropical-nickel-hyperaccumulating-trees-from-sabah-malaysia
#18
Antony van der Ent, Damien L Callahan, Barry N Noller, Jolanta Mesjasz-Przybylowicz, Wojciech J Przybylowicz, Alban Barnabas, Hugh H Harris
The extraordinary level of accumulation of nickel (Ni) in hyperaccumulator plants is a consequence of specific metal sequestering and transport mechanisms, and knowledge of these processes is critical for advancing an understanding of transition element metabolic regulation in these plants. The Ni biopathways were elucidated in three plant species, Phyllanthus balgooyi, Phyllanthus securinegioides (Phyllanthaceae) and Rinorea bengalensis (Violaceae), that occur in Sabah (Malaysia) on the Island of Borneo. This study showed that Ni is mainly concentrated in the phloem in roots and stems (up to 16...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28205444/revisiting-the-corrosion-of-aluminum-current-collector-in-lithium-ion-batteries
#19
Tianyuan Ma, Gui-Liang Xu, Yan Li, Li Wang, Xiangming He, Jianming Zheng, Jun Liu, Mark H Engelhard, Peter Zapol, Larry A Curtiss, Jacob Jorne, Khalil Amine, Zonghai Chen
The corrosion of aluminum current collectors and the oxidation of solvents at a relatively high potential have been widely investigated with an aim to stabilize the electrochemical performance of lithium-ion batteries using such components. The corrosion behavior of aluminum current collectors was revisited using a home-build high-precision electrochemical measurement system, and the impact of electrolyte components and the surface protection layer on aluminum foil was systematically studied. The electrochemical results showed that the corrosion of aluminum foil was triggered by the electrochemical oxidation of solvent molecules, like ethylene carbonate, at a relative high potential...
February 16, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28205438/generation-of-volatile-cadmium-and-zinc-species-based-on-solution-anode-glow-discharge-induced-plasma-electrochemical-processes
#20
Xing Liu, Zhifu Liu, Zhenli Zhu, Dong He, Siqi Yao, Hongtao Zheng, Shenghong Hu
In this study, a novel high efficiency vapor generation strategy was proposed based on solution anode glow discharge for the determination of Cd and Zn by atomic fluorescence spectrometry. In this approach, a glow discharge microplasma was acted as a gaseous cathode to initiate the plasma electrochemical vapor generation of Cd and Zn. Cadmium/Zinc ions could be converted into molecular species efficiently at the plasma-liquid interface from a supporting electrolyte (HCl, pH=3.2). It was found that the overall efficiency of the plasma electrochemical vapor generation (PEVG) system was much higher than the conventional electrochemical hydride generation (EcHG) and HCl-KBH4 system...
February 16, 2017: Analytical Chemistry
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