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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 high performance 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...
January 19, 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, 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...
December 28, 2016: 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
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
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
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
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
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
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
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