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Joshua H Marks, Timothy B Ward, Michael A Duncan
Manganese oxide cluster cations are produced by laser vaporization in a pulsed nozzle source, and detected with time-of-flight mass spectrometry. The mass spectrum contains intense peaks for stoichiometries corresponding to (MnO)n+. Multiphoton photodissociation of these clusters yields smaller ions with the same stoichiometric ratio, either by sequential elimination of MnO units or by various fission processes with roughly equal efficiencies. Fragmentation of clusters containing excess oxygen also yields (MnO)n+ fragments...
March 14, 2018: Journal of Physical Chemistry. A
Zhishun He, Kai Wang, Shasha Zhu, Liang-Ai Huang, Miaomiao Chen, Jianfeng Guo, Shien Pei, Haibo Shao, Jianming Wang
Hierarchically nanostructured binary/multiple transition metal oxides with electrically conductive coatings are very attractive for lithium-ion batteries (LIBs) owing to their excellent electrochemical properties induced by their unique compositions and microstructures. Herein, hierarchical MnO doped Fe3O4@C composite nanospheres are prepared by a simple one-step annealing in Ar atmosphere, using Mn-doped Fe-based metal organic frameworks (Mn-doped MIL-53(Fe)) as precursor. The MnO doped Fe3O4@C composite particles have a uniform nanosphere structure with a diameter of ~100 nm, and each nanosphere is composed of clustered primary nanoparticles with an amorphous carbon shell, forming a unique hierarchical nanoarchitecture...
March 14, 2018: ACS Applied Materials & Interfaces
Qiying Zhou, Xia Jiang, Yinghui Guo, Guochen Zhang, Wenju Jiang
Mesoporous carbon is considered as the most effective adsorbent for dyes with large molecule diameter. In this study, an ultra-high surface area mesoporous carbon was derived using a kind of new template precursors (manganese salts), i.e. manganese carbonate (MC), manganese oxalate (MO) and manganese acetate (MA). The XRD results demonstrated that after the pyrolysis of the mixture of manganese salts and poly(vinyl alcohol) (PVA) over 500 °C, MnO was only the Mn species on carbon and the particle sizes of the generated MnO were in the range of 1...
March 7, 2018: Chemosphere
Yuxuan Zuo, Biao Li, Ning Jiang, Wangsheng Chu, Hao Zhang, Ruqiang Zou, Dingguo Xia
A high capacity cathode is the key to the realization of high-energy-density lithium-ion batteries. The anionic oxygen redox induced by activation of the Li2 MnO3 domain has previously afforded an O3-type layered Li-rich material used as the cathode for lithium-ion batteries with a notably high capacity of 250-300 mAh g-1 . However, its practical application in lithium-ion batteries has been limited due to electrodes made from this material suffering severe voltage fading and capacity decay during cycling. Here, it is shown that an O2-type Li-rich material with a single-layer Li2 MnO3 superstructure can deliver an extraordinary reversible capacity of 400 mAh g-1 (energy density: ≈1360 Wh kg-1 )...
March 13, 2018: Advanced Materials
Hyemin Kim, Nagahiro Saito
MnO2 -carbon hybrid (MnO2 -C-PBz) was simultaneously synthesized by a one-step solution plasma process (SPP) using a single precursor referred to as "purple benzene", which was derived from the K+ (dicyclohexano-18-crown-6 ether) complex. To clarify the synergistic effects on the cationic dye removal, MnO2 -free carbon and carbon-free MnO2 samples were concurrently investigated. The results of adsorption for cationic dyes (methylene blue (MB) and rhodamine B (Rh B)) and anionic dye (methyl orange (MO)) revealed remarkably high affinity for cationic dyes...
March 12, 2018: Scientific Reports
Jinjie Wang, Liubing Dong, Chengjun Xu, Danyang Ren, Xinpei Ma, Feiyu Kang
Polymorphous supercapacitors were constructed from flexible three-dimensional (3D) carbon network/polyaniline (PANI)/MnO2 composite textile electrodes. The flexible textile electrodes were fabricated through a layer-by-layer construction strategy: PANI, carbon nanotubes (CNTs) and MnO2 were deposited on activated carbon fiber cloth (ACFC) in turn through electro-polymerization process, "dipping and drying" method and in situ chemical reaction, respectively. In the fabricated ACFC/PANI/CNTs/MnO2 textile electrodes, ACFC-CNT hybrid framework serves as porous and electrically conductive 3D network for rapid transmission of electrons and electrolyte ions, while ACFC, PANI and MnO2 are high-performance supercapacitor electrode materials...
March 12, 2018: ACS Applied Materials & Interfaces
Kai Sun, Shunyao Li, Michael Gatheru Waigi, Qingguo Huang
It has been shown that manganese dioxide (MnO2 ) can mediate transformation of phenolic contaminants to form phenoxyl radical intermediates, and subsequently, these intermediates intercouple to form oligomers via covalent binding. However, the reaction kinetics and transformation mechanisms of phenolic contaminants with humic molecules present in nano-MnO2 -mediated systems were still unclear. In this study, it was proven that nano-MnO2 were effective in transforming triclosan under acidic conditions (pH 3...
March 10, 2018: Environmental Science and Pollution Research International
Malak Khojasteh, Shima Haghighat, Jahan Dawlaty, Vitaly V Kresin
Emulating water oxidation catalyzed by the oxomanganese clusters in the photosynthetic apparatus of plants has been a long-standing scientific challenge. The use of manganese oxide films has been explored, but while they may be catalytically active on the surface, their poor conductivity hinders their overall performance. We have approached this problem by using manganese oxide nanoparticles with sizes of 4, 6 and 8 nm, produced in a sputter-gas-aggregation source and soft-landed onto conducting electrodes...
March 8, 2018: Nanotechnology
Zhengzheng Li
MnO2 -graphene nanosheets wrapped mesoporous carbon/sulfur (MGN@MC/S) composite is successfully synthesized derived from metal-organic frameworks and investigated as cathode for lithium-ion batteries. Used as cathode, MGN@MC/S composite possesses electronic conductivity network for redox electron transfer and strong chemical bonding to lithium polysulfides, which enables low capacity loss to be achieved. MGN@MC/S cathodes exhibit high reversible capacity of 1475 mA h g-1 at 0.1 C and an ultra-low capacity fading of 0...
February 2018: Royal Society Open Science
Simon Drieschner, Maximilian von Seckendorff, Elena Del Corro, Jörg Wohlketzetter, Benno Martin Blaschke, Martin Stutzmann, Jose A Garrido
Supercapacitors are called to play a prominent role in the newly emerging markets of electric vehicles, flexible displays and sensors, and wearable electronics. In order to compete with current battery technology, supercapacitors have to be designed with highly conductive current collectors exhibiting high surface area per unit volume and uniformly coated with pseudocapacitive materials, which is crucial to boost the energy density while maintaining a high power density. Here, we present a versatile technique to prepare thickness-controlled thin-film micro graphene foams (μGFs) with pores in the lower micrometer range grown by chemical vapor deposition which can be used as highly conductive current collectors in flexible supercapacitors...
March 7, 2018: Nanotechnology
Suli Zhi, Liang Tian, Nan Li, Keqiang Zhang
The MnO2 -mullite-cordierite composite particle (MnO2 -MCP) was prepared and firstly was applied as catalyst with sodium hypochlorite (NaOCl) as oxidant in heterogeneous Fenton-like system for methylene blue (MB) decolorization. The MnO2 -MCP was characterized by XRD, SEM, EDS and BET analysis. The decolorization efficiencies of MB/MnO2 -MCP, MB/NaClO, (MB after filtrating MnO2 -MCP)/NaClO and MB/MnO2 -MCP/NaClO were compared, which confirmed the interaction ability between MnO2 -MCP and NaClO. After evaluating the role of adsorption of MB by MnO2 -MCP, the catalytic oxidation effects of MnO2 -MCP with NaClO on MB were exploited...
March 2, 2018: Journal of Environmental Management
Xinsheng Luo, Heng Liang, Fangshu Qu, An Ding, Xiaoxiang Cheng, Chuyang Y Tang, Guibai Li
Catalytic membrane, due to its compact reactor assembling, high catalytic performance as well as low energy consumption, has proved to be more attractive for wastewater treatment. In this work, a free-standing α-MnO2 @CuO membrane with hierarchical nanostructures was prepared and evaluated as the catalytic membrane to generate radicals from peroxymonosulfate (PMS) for the oxidative degradation of organic dyes in aqueous solution. Benefiting from the high mass transport efficiency and the hierarchical nanostructures, a superior catalytic activity of the membrane was observed for organic dyes degradation...
February 20, 2018: Chemosphere
Wenbo Liu, Nora B Sutton, Huub H M Rijnaarts, Alette A M Langenhoff
This is the first study examining pharmaceutical removal under anoxic conditions with MnO2 . This study compares the abiotic removal of seven pharmaceuticals with reactive MnO2 particles in the presence of oxygen (oxic conditions) and in the absence of oxygen (anoxic conditions). Due to the novelty of pharmaceutical removal under anoxic conditions, the influence of phosphate buffer, pH, and MnO2 morphologies is also examined. Results show that over 90% of diclofenac is removed under anoxic conditions. Additionally, we found that (1) anoxic conditions are beneficial for diclofenac removal with MnO2 , (2) phosphate buffer affects the pharmaceutical removal efficiencies, (3) higher pharmaceutical removal is obtained at acidic pH compared to that at neutral or alkaline conditions, and (4) amorphous MnO2 removes pharmaceuticals better than crystalline MnO2 ...
February 28, 2018: Environmental Science and Pollution Research International
Torunn Kringlen Ervik, Nathalie Benker, Stephan Weinbruch, Asbjørn Skogstad, Yngvar Thomassen, Dag G Ellingsen, Balázs Berlinger
This paper discusses the combined use of electron backscatter diffraction (EBSD) and energy dispersive X-ray microanalysis (EDX) to identify unknown phases in particulate matter from different workplace aerosols. Particles of α-silicon carbide (α-SiC), manganese oxide (MnO) and α-quartz (α-SiO2 ) were used to test the method. Phase identification of spherical manganese oxide particles from ferromanganese production, with diameter less than 200 nm, was unambiguous, and phases of both MnO and Mn3 O4 were identified in the same agglomerate...
March 1, 2018: Analytical and Bioanalytical Chemistry
Yunsheng Xia, Lu Xia, Yuxi Liu, Tao Yang, Jiguang Deng, Hongxing Dai
α-MnO2 nanotubes and their supported Au-Pd alloy nanocatalysts were prepared using hydrothermal and polyvinyl alcohol-protected reduction methods, respectively. Their catalytic activity for the oxidation of toluene/m-xylene, acetone/ethyl acetate, acetone/m-xylene and ethyl acetate/m-xylene mixtures was evaluated. It was found that the interaction between Au-Pd alloy nanoparticles and α-MnO2 nanotubes significantly improved the reactivity of lattice oxygen, and the 0.91wt.% Au0.48 Pd/α-MnO2 nanotube catalyst outperformed the α-MnO2 nanotube catalyst in the oxidation of toluene, m-xylene, ethyl acetate and acetone...
February 2018: Journal of Environmental Sciences (China)
Tingsheng Lin, Xiaozhi Zhao, Sheng Zhao, Hang Yu, Wenmin Cao, Wei Chen, Hui Wei, Hongqian Guo
Photodynamic therapy (PDT) is an emerging effective treatment for cancer. However, the great promise of PDT for bladder cancer therapy has not yet been realized because of tumor hypoxia. To address this challenge, we fabricated O2 -generating HSA-MnO2 -Ce6 NPs (HSA for human serum albumin, Ce6 for chlorin e6, and NPs for nanoparticles) to overcome tumor hypoxia and thus enhance the photodynamic effect for bladder cancer therapy. Methods: The HSA-MnO2 -Ce6 NPs were prepared. We investigated the O2 generation of NPs in vitro and in vivo ...
2018: Theranostics
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
Qian Chen, Liangzhu Feng, Jingjing Liu, Wenwen Zhu, Ziliang Dong, Yifan Wu, Zhuang Liu
No abstract text is available yet for this article.
February 2018: Advanced Materials
Leijenaar Rth, Bogowicz M, Jochems A, Hoebers Fjp, Frederik Fwr, Huang Sh, Chan B, Waldron Jn, O'Sullivan B, Rietveld D, Leemans Cr, Brakenhoff Rh, Riesterer O, Tanadini-Lang S, Guckenberger M, Ikenberg K, Lambin P
OBJECTIVES: HPV positive oropharyngeal cancer (OPSCC) is biologically and clinically different from HPV negative OPSCC. Here, we evaluate the use of a radiomic approach to identify the HPV status of OPSCC. METHODS: Four independent cohorts, totaling 778 OPSCC patients with HPV determined by p16 were collected. We randomly assigned 80% of all data for model training (N=628) and 20% for validation (N=150). On the pre-treatment CT images, 902 radiomic features were calculated from the gross tumor volume (GTV)...
February 16, 2018: British Journal of Radiology
Chenmu Zhang, Ning Duan, Linhua Jiang, Fuyuan Xu, Jin Luo
The influence of Mn 2+ ions on the generation of heavy metal anode slime during zinc electrolysis industry was extensively investigated using several electrochemical methods, electron microscope technologies, and particle size analysis. Results showed that the Mn 2+ could obviously promote oxygen evolution reaction (OER) and thereby weaken oxidation efficiency of Mn 2+ (η MnO2 ) and dissolution of Pb 2+ . The significant improvement in kinetic parameters for OER was found in electrolytes of 1 and 3 g/L Mn 2+ , but became unstable as the Mn 2+ concentration increased to 10 g/L...
February 15, 2018: Environmental Science and Pollution Research International
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