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https://www.readbyqxmd.com/read/27883142/a-scalable-in-situ-surfactant-free-synthesis-of-a-uniform-mno-graphene-composite-for-highly-reversible-lithium-storage
#1
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)).
November 24, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27857311/ytterbium-doped-q-switched-fiber-laser-based-upon-manganese-dioxide-mno-sub-2-sub-saturable-absorber
#2
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
https://www.readbyqxmd.com/read/27826503/improved-lithium-ion-battery-anode-capacity-with-a-network-of-easily-fabricated-spindle-like-carbon-nanofibers
#3
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
https://www.readbyqxmd.com/read/27816743/in-situ-tracking-the-reversible-spinel-rocksalt-structural-transformation-between-mn3o4-and-mno
#4
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
https://www.readbyqxmd.com/read/27783832/capitalizing-on-military-nurse-skills-for-second-career-leadership-and-staff-development-roles
#5
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
https://www.readbyqxmd.com/read/27740785/long-spin-diffusion-length-in-few-layer-graphene-flakes
#6
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
https://www.readbyqxmd.com/read/27723732/coherent-spin-exchange-via-a-quantum-mediator
#7
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
https://www.readbyqxmd.com/read/27722627/a-hexameric-mnna6-wheel-based-on-mno-7-sub-units
#8
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
https://www.readbyqxmd.com/read/27712032/insights-into-the-impact-of-impurities-and-non-stoichiometric-effects-on-the-electrochemical-performance-of-li2-mnsio4
#9
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
https://www.readbyqxmd.com/read/27711430/water-dissociation-on-mno-1-%C3%A3-1-ag-100
#10
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
https://www.readbyqxmd.com/read/27684326/interconnected-nanoflake-network-derived-from-a-natural-resource-for-high-performance-lithium-ion-batteries
#11
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
https://www.readbyqxmd.com/read/27607557/electrochemical-fabrication-of-monolithic-electrodes-with-core-shell-sandwiched-transition-metal-oxide-oxyhydroxide-for-high-performance-energy-storage
#12
Shaozhong Chang, Jun Pu, Jian Wang, Hongxiu Du, Qingwen Zhou, Ziqiang Liu, Chao Zhu, Jiachen Li, Huigang Zhang
Transition metal oxides/oxyhydroxides (TMOs) are promising high-capacity materials for electrochemical energy storage. However, the low rate and poor cyclability hinder practical applications. In this work, we developed a general electrochemical route to fabricate monolithic core/shell sandwiched structures, which are able to significantly improve the electrochemical properties of TMO electrodes by electrically wiring the insulating active materials and alleviating the adverse effects caused by volume changes using engineered porous structures...
October 5, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27585373/formation-of-a-spin-forbidden-product-1-mno4-from-gas-phase-decomposition-of-6-mn-no3-3
#13
Johnny Lightcap, Thomas H Hester, Daniel Patterson, Joseph T Butler, Daniel J Goebbert
The manganese nitrate complex, [Mn(NO3)3](-), was generated via electrospray ionization and studied by tandem quadrupole mass spectrometry. The complex is assumed to decompose into [MnO(NO3)2](-) by elimination of NO2(•). The [MnO(NO3)2](-) product undergoes elimination of NO2(•) to yield [MnO2(NO3)](-), or elimination of NO(•) to yield [MnO3(NO3)](-). Both [MnO2(NO3)](-) and [MnO3(NO3)](-) yield [MnO4](-) via the transfer of oxygen atoms from the remaining nitrate ligand. The mechanism of permanganate formation is interesting because it can be generated through two competing pathways, and because the singlet ground state is spin-forbidden from the high-spin sextet [Mn(NO3)3](-) precursor...
September 15, 2016: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/27562457/yolk-shell-mno-znmn2-o4-n-c-nanorods-derived-from-%C3%AE-mno2-zif-8-as-anode-materials-for-lithium-ion-batteries
#14
Ming Zhong, Donghui Yang, Chenchao Xie, Zhang Zhang, Zhen Zhou, Xian-He Bu
Manganese oxides (MnOx ) are promising anode materials for lithium ion batteries, but they generally exhibit mediocre performances due to intrinsic low ionic conductivity, high polarization, and poor stability. Herein, yolk-shell nanorods comprising of nitrogen-doped carbon (N-C) coating on manganese monoxide (MnO) coupled with zinc manganate (ZnMn2 O4 ) nanoparticles are manufactured via one-step carbonization of α-MnO2 /ZIF-8 precursors. When evaluated as anodes for lithium ion batteries, MnO@ZnMn2 O4 /N-C exhibits an reversible capacity of 803 mAh g(-1) at 50 mA g(-1) after 100 cycles, excellent cyclability with a capacity of 595 mAh g(-1) at 1000 mAg(-1) after 200 cycles, as well as better rate capability compared with those non-N-C shelled manganese oxides (MnOx )...
August 26, 2016: Small
https://www.readbyqxmd.com/read/27548949/-distribution-characteristics-sources-and-pollution-assessment-of-trace-elements-in-surficial-sediments-of-the-coastal-wetlands-northeastern-hainan-island
#15
Wei-kun Zhang, Hua-yang Gan, Xiang-yang Bi, Jia-sheng Wang
Totally 128 surficial sediments samples were collected from the coastal wetlands, northeastern Hainan Island and analyzed for their concentrations of 14 elements including Al2O3, Fe2O3, MnO, Cu, Ni, Sr, Zn, V, Pb, Cr, Zr, As, Cd and Hg, TOC and grain sizes. The mean concentrations of trace metals V, Cr, Ni, Cu, Zn, As, Pb, Cd and Hg were (40.13 +/- 32.65), (35.92 +/- 26.90), (13.03 +/- 11.46), (11.56 +/- 10.27)-, (48.75 +/- 27.00), (5.48 +/- 1.60), ( 18.70 +/- 8.66), (0.054 +/- 0.045 ), (0.050 +/- 0.050) microg x g(-1), respectively, which were much lower than those in Pearl River Estuary, Yangzi River Estuary, Bohai Bay, upper crust and average shale...
April 15, 2016: Huan Jing Ke Xue= Huanjing Kexue
https://www.readbyqxmd.com/read/27547847/cumulant-approximated-second-order-perturbation-theory-based-on-the-density-matrix-renormalization-group-for-transition-metal-complexes-a-benchmark-study
#16
Quan Manh Phung, Sebastian Wouters, Kristine Pierloot
The complete active space second order perturbation theory (CASPT2) can be extended to larger active spaces by using the density matrix renormalization group (DMRG) as solver. Two variants are commonly used: the costly DMRG-CASPT2 with exact 4-particle reduced density matrix (4-RDM) and the cheaper DMRG-cu(4)-CASPT2 in which the 4-cumulant is discarded. To assess the accuracy and limitations of the latter variant DMRG-cu(4)-CASPT2 we study the spin state energetics of iron porphyrin Fe(P) and its model compound FeL2, a model for the active center of NiFe hydrogenase, and manganese-oxo porphyrin MnO(P)(+); a series of excited states of chromium hexacarbonyl Cr(CO)6; and the interconversion of two Cu2O2(2+) isomers...
September 13, 2016: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/27544727/efficient-activation-of-peroxymonosulfate-by-magnetic-mn-mgo-for-degradation-of-bisphenol-a
#17
Jiangkun Du, Jianguo Bao, Ying Liu, Haibo Ling, Han Zheng, Sang Hoon Kim, Dionysios D Dionysiou
A heterogeneous manganese/magnetite/graphene oxide (Mn-MGO) hybrid catalyst was fabricated through the reduction of KMnO4 by ethylene glycol in the presence of magnetite/GO (MGO) particles. The Mn-MGO catalyst exhibited high efficacy and long-term stability in activating peroxymonosulfate (PMS) to generate sulfate radicals for the removal of bisphenol A (BPA) from water. The results of the batch experiments indicated that an increase in the catalyst dose and solution pH could enhance BPA degradation in the coupled Mn-MGO/PMS system...
December 15, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27494483/self-organized-growth-structure-and-magnetism-of-monatomic-transition-metal-oxide-chains
#18
Pascal Ferstl, Lutz Hammer, Christopher Sobel, Matthias Gubo, Klaus Heinz, M Alexander Schneider, Florian Mittendorfer, Josef Redinger
We report on the self-organized growth of monatomic transition-metal oxide chains of (3×1) periodicity and unusual MO_{2} stoichiometry (M=Ni, Co, Fe, Mn) on Ir(100). We analyze their structural and magnetic properties by means of quantitative LEED, STM, and density functional theory (DFT) calculations. LEED analyses reveal a fascinating common atomic structure in which the transition-metal atoms sit above a missing-row structure of the surface and are coupled to the substrate only via oxygen atoms. This structure is confirmed by DFT calculations with structural parameters deviating by less than 1...
July 22, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27454741/porphyrins-as-templates-for-site-selective-atomic-layer-deposition-vapor-metalation-and-in-situ-monitoring-of-island-growth
#19
Jason R Avila, Jonathan D Emery, Michael J Pellin, Alex B F Martinson, Omar K Farha, Joseph T Hupp
Examinations of enzymatic catalysts suggest one key to efficient catalytic activity is discrete size metallo clusters. Mimicking enzymatic cluster systems is synthetically challenging because conventional solution methods are prone to aggregation or require capping of the cluster, thereby limiting its catalytic activity. We introduce site-selective atomic layer deposition (ALD) on porphyrins as an alternative approach to grow isolated metal oxide islands that are spatially separated. Surface-bound tetra-acid free base porphyrins (H2TCPP) may be metalated with Mn using conventional ALD precursor exposure to induce homogeneous hydroxide synthetic handles which acts as a nucleation point for subsequent ALD MnO island growth...
August 10, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27447517/giant-optical-polarization-rotation-induced-by-spin-orbit-coupling-in-polarons
#20
Blai Casals, Rafael Cichelero, Pablo García Fernández, Javier Junquera, David Pesquera, Mariano Campoy-Quiles, Ingrid C Infante, Florencio Sánchez, Josep Fontcuberta, Gervasi Herranz
We have uncovered a giant gyrotropic magneto-optical response for doped ferromagnetic manganite La_{2/3}Ca_{1/3}MnO_{3} around the near room-temperature paramagnetic-to-ferromagnetic transition. At odds with current wisdom, where this response is usually assumed to be fundamentally fixed by the electronic band structure, we point to the presence of small polarons as the driving force for this unexpected phenomenon. We explain the observed properties by the intricate interplay of mobility, Jahn-Teller effect, and spin-orbit coupling of small polarons...
July 8, 2016: Physical Review Letters
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