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David McNulty, Hugh Geaney, Colm O'Dwyer
We present the formation of a carbon-coated honeycomb ternary Ni-Mn-Co-O inverse opal as a conversion mode anode material for Li-ion battery applications. In order to obtain high capacity via conversion mode reactions, a single phase crystalline honeycombed IO structure of Ni-Mn-Co-O material was first formed. This Ni-Mn-Co-O IO converts via reversible redox reactions and Li2O formation to a 3D structured matrix assembly of nanoparticles of three (MnO, CoO and NiO) oxides, that facilitates efficient reactions with Li...
February 10, 2017: Scientific Reports
Lianyi Shao, Qing Zhao, Jun Chen
MnOOH nanorods, which were prepared using a hydrothermal method, have been used for the first time as anode materials for sodium ion batteries. The as-prepared MnOOH nanorods with lengths of 1.2-3.7 μm and diameters of 60-90 nm delivered high performance of reversible electrochemical Na/Na(+) storage such as an initial discharge capacity of 485.5 mA h g(-1) at 80 mA g(-1), a high initial Coulombic efficiency of 86.7% and a low average potential polarization of 0.36 V. Instrumental analyses with ex situ XRD, TEM and XPS show that the sodium storage mechanism in MnOOH can be related to the reversible formation of MnO and NaOH...
February 9, 2017: Chemical Communications: Chem Comm
Florence T Ling, Jeffrey E Post, Peter J Heaney, James D Kubicki, Cara M Santelli
The characterization of birnessite structures is particularly challenging for poorly crystalline materials of biogenic origin, and a determination of the relative concentrations of triclinic and hexagonal birnessite in a mixed assemblage has typically required synchrotron-based spectroscopy and diffraction approaches. In this study, Fourier-transform infrared spectroscopy (FTIR) is demonstrated to be capable of differentiating synthetic triclinic Na-birnessite and synthetic hexagonal H-birnessite. Furthermore, IR spectral deconvolution of peaks resulting from MnO lattice vibrations between 400 and 750cm(-1) yield results comparable to those obtained by linear combination fitting of synchrotron X-ray absorption fine structure (EXAFS) data when applied to known mixtures of triclinic and hexagonal birnessites...
January 17, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Shailesh Kharkwal, Yi Chao Tan, Min Lu, How Yong Ng
A novel microbial fuel cell (MFC)-based biosensor was designed for continuous monitoring of biochemical oxygen demand (BOD) in real wastewater. To lower the material cost, manganese dioxide (MnO₂) was tested as an innovative cathode catalyst for oxygen reduction in a single chamber air-cathode MFC, and two different crystalline structures obtained during synthesis of MnO₂ (namely β- and γ-MnO₂) were compared. The BOD sensor was studied in a comprehensive way, using both sodium acetate solution and real domestic wastewater (DWW)...
January 28, 2017: International Journal of Molecular Sciences
Li Zhou, Yifan Huang, Weiwen Qiu, Zhanxiang Sun, Zhongqi Liu, Zhengguo Song
There is a continuing need to develop effective materials for the environmental remediation of copper-contaminated sites. Nano-MnO₂-biochar composites (NMBCs) were successfully synthesized through the reduction of potassium permanganate by ethanol in a biochar suspension. The physicochemical properties and morphology of NMBCs were examined, and the Cu(II) adsorption properties of this material were determined using various adsorption isotherms and kinetic models. The adsorption capacity of NMBCs for Cu(II), which was enhanced by increasing the pH from 3 to 6, was much larger than that of biochar or nano-MnO₂...
January 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Chenglong Yu, Feng Chen, Lifu Dong, Xiaoqing Liu, Bichun Huang, Xinnan Wang, Shengbang Zhong
Manganese-rich MnSAPO-34 molecular sieves were prepared by one-pot synthesis method for NO x abatement using the ammonia-selective catalytic reduction (NH3-SCR) technology and characterized using ICP, BET, XRD, FE-SEM, H2-TPR, NH3-TPD, XPS, and DR UV-Vis analyses. The experimental results indicate that the Mn content and chemical state, as well as the surface acidity, of the MnSAPO-34 molecular sieves significantly enhance their DeNO x efficiency at low temperatures (ca. 200-300 °C). The manganese-rich MnSAPO-34 was synthesized using a combination of triethylamine and diisopropylamine as the structural directing agents and high Mn loading (n(MnO)/n(P2O5) = 0...
January 23, 2017: Environmental Science and Pollution Research International
Dan Sun, Yougen Tang, Delai Ye, Jun Yan, Haoshen Zhou, Haiyan Wang
Morphology controllable fabrication of electrode materials is of great significance but is still a major challenge for constructing advanced Li ion batteries. Herein, we propose a novel space constraint assembly approach to tune the morphology of Mn(terephthalic acid) (PTA)-MOF, in which benzonic acid was employed as a modulator to adjust the available MOF assembly directions. As a result, Mn(PTA)-MOFs with microquadrangulars, microflakes, and spindle-like microrods morphologies have been achieved. MnO/C hybrids with preserved morphologies were further obtained by self-sacrificial and thermal transformation of Mn(PTA)-MOFs...
February 2, 2017: ACS Applied Materials & Interfaces
Kyoungsuk Jin, Hongmin Seo, Toru Hayashi, Mani Balamurugan, Donghyuk Jeong, Yoo Kyung Go, Jung Sug Hong, Kang Hee Cho, Hirotaka Kakizaki, Nadège Bonnet-Mercier, Min Gyu Kim, Sun Hee Kim, Ryuhei Nakamura, Ki Tae Nam
The development of active water oxidation catalysts is critical to achieve high efficiency in overall water splitting. Recently, sub-10 nm-sized monodispersed partially oxidized manganese oxide nanoparticles were shown to exhibit not only superior catalytic performance for oxygen evolution, but also unique electrokinetics, as compared to their bulk counterparts. In the present work, the water-oxidizing mechanism of partially oxidized MnO nanoparticles was investigated using integrated in situ spectroscopic and electrokinetic analyses...
February 1, 2017: Journal of the American Chemical Society
Kamal Azadkish, Mohammad T Jafari, Hassan S Ghaziaskar
Trace amounts of oxygen was determined using negative corona discharge as an ionization source for ion mobility spectrometry. A point-in-cylinder geometry with novel design was used to establish the corona discharge without interferences of negative ions such as NOX(-). The desirable background spectrum shows only electrons peak, providing the instrument capable of trace analysis of oxygen in gaseous samples. The limit of detection and linear dynamic range with high coefficient of determination (r(2) = 0...
February 8, 2017: Analytica Chimica Acta
Wenlong Cai, Gaoran Li, Kailong Zhang, Jianbin Zhou, Yitai Qian, Jin Du
A novel MnO/graphene composite, used as an anode for lithium ion intercalation, was prepared via an in situ surfactant-free facile method by taking advantage of the byproduct Mn ion in the conventional fabrication of graphene oxide. The as-fabricated lithium ion batteries exhibited a long-term stable reversible capacity (603 mA h g(-1) after 350 cycles at 1 A g(-1) based on the composite, hereinafter the same) and superior rate performance (400 mA h g(-1) at 3 A g(-1)).
December 6, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Haroldo T Hattori, Abdul Khaleque, Liming Liu, Michael R Greck
Manganese dioxide (MnO<sub>2</sub>) is an abundant material that is widely used in many devices, such as alkaline batteries. At infrared frequencies, MnO<sub>2</sub> is lossy and strongly absorbs light. These characteristics make MnO<sub>2</sub> a potential candidate as a low-cost saturable absorber in Q-switched lasers. In this paper, we examine the performance of MnO<sub>2</sub> as a saturable absorber in an ytterbium-doped Q-switched fiber laser: we show that it can produce pulses with durations ranging from 300 to 1800 ns...
November 10, 2016: Applied Optics
Mengting Liu, Wenhe Xie, Lili Gu, Tianfeng Qin, Xiaoyi Hou, Deyan He
A novel network of spindle-like carbon nanofibers was fabricated via a simplified synthesis involving electrospinning followed by preoxidation in air and postcarbonization in Ar. Not only was the as-obtained carbon network comprised of beads of spindle-like nanofibers but the cubic MnO phase and N elements were successfully anchored into the amorphous carbon matrix. When directly used as a binder-free anode for lithium-ion batteries, the network showed excellent electrochemical performance with high capacity, good rate capacity and reliable cycling stability...
2016: Beilstein Journal of Nanotechnology
Xingyuan San, Bo Zhang, Jing Wang, Bo Wu, Xiuliang Ma
Electron beam irradiation is well known to induce damage in materials. The structural transformation involved in the damage is usually believed to be an irreversible solid state chemical reaction. Here we use in situ transmission electron microscopy (TEM) combined electron-energy loss spectroscopy (EELS) technique in an aberration-corrected TEM to track the structural transformation in spinel Mn3O4 induced by electron beam irradiation. It is clarified that spinel Mn3O4 is transformed to rocksalt structured MnO by irradiation and the reversed recovering transition from rocksalt MnO to spinel Mn3O4 can occur by aging in the gentle electron beam circumstance...
October 27, 2016: Micron: the International Research and Review Journal for Microscopy
Donna M Lake, Patricia E Allen, Myrna L Armstrong
Nursing continues to face professional workforce and diversity shortage problems. This article advocates for examining an untapped resource-the consideration of applicants for nursing leadership and educational positions in civilian health care organizations. This untapped resource is highly qualified, already retired (or going to be separated) military nurse officers (MNOs) who possess extensive health care knowledge, as well as distinctive ethnicity and gender composition. Clinical educators, as part of the organizational leadership, can play an important role in assisting the MNO civilian position assimilation because they come from a structured and unique cultural environment...
November 1, 2016: Journal of Continuing Education in Nursing
W Yan, L C Phillips, M Barbone, S J Hämäläinen, A Lombardo, M Ghidini, X Moya, F Maccherozzi, S van Dijken, S S Dhesi, A C Ferrari, N D Mathur
We report a spin valve with a few-layer graphene flake bridging highly spin-polarized La_{0.67}Sr_{0.33}MnO_{3} electrodes, whose surfaces are kept clean during lithographic definition. Sharp magnetic switching is verified using photoemission electron microscopy with x-ray magnetic circular dichroism contrast. A naturally occurring high interfacial resistance ∼12  MΩ facilitates spin injection, and a large resistive switching (0.8  MΩ at 10 K) implies a 70-130  μm spin diffusion length that exceeds previous values obtained with sharp-switching electrodes...
September 30, 2016: Physical Review Letters
Timothy Alexander Baart, Takafumi Fujita, Christian Reichl, Werner Wegscheider, Lieven Mark Koenraad Vandersypen
Coherent interactions at a distance provide a powerful tool for quantum simulation and computation. The most common approach to realize an effective long-distance coupling 'on-chip' is to use a quantum mediator, as has been demonstrated for superconducting qubits and trapped ions. For quantum dot arrays, which combine a high degree of tunability with extremely long coherence times, the experimental demonstration of the time evolution of coherent spin-spin coupling via an intermediary system remains an important outstanding goal...
October 10, 2016: Nature Nanotechnology
Maria Manoli, Ross Inglis, Stergios Piligkos, Lan Yanhua, Wolfgang Wernsdorfer, Euan K Brechin, Anastasios J Tasiopoulos
A novel hexameric [MnNa6] wheel-like aggregate consisting of [MnO] triangles is reported. It is the second highest nuclearity oxime-based Mn cluster, the largest member of the recently-developed family of molecular oligomers based on [MnO] triangles, and the only one with a wheel-like metal topology.
September 29, 2016: Chemical Communications: Chem Comm
S Fleischmann, M Mancini, P Axmann, U Golla-Schindler, U Kaiser, M Wohlfahrt-Mehrens
A series of Li2 MnSiO4 samples with various Li, Mn, and/or Si concentrations are reported to study for the first time the effect of impurities and deviation from ideal stoichiometry on electrochemical behavior. Carbon-coated and nanosized powders are obtained at 600 °C and compared with those synthetized at 900 °C. Samples are investigated using XRD, SEM, high-resolution TEM, attenuated total reflection infrared spectroscopy and Brunauer-Emmett-Teller surface area to characterize crystal structure, particle size, impurity amount, morphology, and surface area...
October 6, 2016: ChemSusChem
Chris Arble, Xiao Tong, Livia Giordano, Anna Maria Ferrari, John T Newberg
In this work we utilize experimental and simulation techniques to examine the molecular level interaction of water with a MnO(1 × 1) thin film deposited onto Ag(100). The formation of MnO(1 × 1)/Ag(100) was characterized by low energy electron diffraction and scanning tunneling microscopy. Density functional theory (DFT) shows MnO(1 × 1) is thermodynamically more stable than MnO(2 × 1) by ∼0.4 eV per MnO. Upon exposure to 2.5 Torr water vapor at room temperature, X-ray photoemission spectroscopy results show extensive surface hydroxylation attributed to reactivity at MnO(1 × 1) terrace sites...
September 14, 2016: Physical Chemistry Chemical Physics: PCCP
Fei Cheng, Wen-Cui Li, An-Hui Lu
Numerous natural resources have a highly interconnected network with developed porous structure, so enabling directional and fast matrix transport. Such structures are appealing for the design of efficient anode materials for lithium-ion batteries, although they can be challenging to prepare. Inspired by nature, a novel synthesis route from biomass is proposed by using readily available auricularia as retractable support and carbon coating precursor to soak up metal salt solution. Using the swelling properties of the auricularia with the complexation of metal ions, a nitrogen-containing MnO@C nanoflake network has been easily synthesized with fast electrochemical reaction dynamics and a superior lithium storage performance...
October 6, 2016: ACS Applied Materials & Interfaces
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