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https://www.readbyqxmd.com/read/28431460/paramagnetic-intrinsic-defects-in-polycrystalline-large-area-2d-mos2-films-grown-on-sio2-by-mo-sulfurization
#1
A Stesmans, S Iacovo, D Chiappe, I Radu, C Huyghebaert, S De Gendt, V V Afanas'ev
A low-temperature electron spin resonance study has been carried out on large-area high-purity polycrystalline two-dimensional few monolayer (ML) 2H MoS2 films synthesized by sulfurization of Mo layers, with intent to atomically assess mobility-degrading detrimental point defects. This reveals the presence of a distinct previously unreported anisotropic defect of axial symmetry about the c-axis characterized by g // = 2.00145 and g ⊥ = 2.0027, with corresponding density (spin S = ½) ~3 × 10(12) cm(-2) for a 4 ML thick film...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28430216/ultrahigh-birefringence-ultralow-material-loss-porous-core-single-mode-fiber-for-terahertz-wave-guidance
#2
Kawsar Ahmed, Sawrab Chowdhury, Bikash Kumar Paul, Md Shadidul Islam, Shuvo Sen, Md Ibadul Islam, Sayed Asaduzzaman
In this paper, a novel polarization-maintaining single-mode photonic crystal fiber (PCF) has been suggested for terahertz (THz) transmission applications. The reported PCF has five layers of hexagonal cladding with two layers of porous core. The cladding and core territory of the PCF are constituted by circular and elliptical air cavities, accordingly acting as a dielectric medium. Different geometrical parameters of the proposed PCF including pitches and diameters of circular air holes with the major and minor axes of elliptical air cavities being varied with the optimized structure...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28429942/layer-polarizability-and-easy-axis-quantum-hall-ferromagnetism-in-bilayer-graphene
#3
Cheng Pan, Yong Wu, Bin Cheng, Shi Che, Takashi Taniguchi, Kenji Watanabe, Chun Ning Lau, Marc Bockrath
We report magnetotransport measurements of graphene bilayers at large perpendicular electric displacement fields, up to ∽ 1.5 V/nm, where we observe crossings between Landau levels with different orbital quantum numbers. The displacement fields at the studied crossings are primarily determined by energy shifts originating from the Landau level layer polarizability or polarization. Despite decreasing Landau level spacing with energy, successive crossings occur at larger displacement fields, resulting from decreasing polarizability with orbital quantum number...
April 21, 2017: Nano Letters
https://www.readbyqxmd.com/read/28429934/bi4tao8cl-nano-photocatalyst-influence-of-local-average-and-band-structure
#4
Swetha S M Bhat, Diptikanta Swain, Mikhail Feygenson, Joerg C Neuefeind, Abhishek K Mishra, Janardhan L Hodala, Chandrabhas Narayana, Ganapati V Shanbhag, Nalini G Sundaram
The average structure, local structure, and band structure of nanoparticles of photocatalyst Bi4TaO8Cl, an Aurivillius-Sillen layered material, has been studied by powder neutron Rietveld refinement, neutron pair distribution function technique, Raman scattering, and density functional theory calculations. A significant local structural deviation of nano-Bi4TaO8Cl was established in contrast to the local structure of bulk-Bi4TaO8Cl. Local structure was further supported by Raman scattering measurements. Through DFT calculations, we identify specific features in the electronic band structure that correlate lower secondary structural distortions in nano-Bi4TaO8Cl...
April 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28429021/preparation-and-characterization-of-metastable-trigonal-layered-msb2o6-phases-m-co-ni-cu-zn-and-mg-and-considerations-on-fesb2o6
#5
A Yu Nikulin, E A Zvereva, V B Nalbandyan, I L Shukaev, A I Kurbakov, M D Kuchugura, G V Raganyan, Yu V Popov, V D Ivanchenko, A N Vasiliev
MSb2O6 compounds (M = Mg, Co, Ni, Cu, Zn) are known in the tetragonal trirutile forms, slightly distorted monoclinically with M = Cu due to the Jahn-Teller effect. In this study, using a low-temperature exchange reaction between ilmenite-type NaSbO3 and molten MSO4-KCl (or MgCl2-KCl) mixtures, these five compositions were prepared for the first time as trigonal layered rosiaite (PbSb2O6)-type phases. Upon heating, they irreversibly transform to the known phases via amorphous intermediates, in contrast to previously studied isostructural MnSb2O6, where the stable phase is structurally related to the metastable phase...
April 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28429011/drop-transport-and-positioning-on-lubricant-impregnated-surfaces
#6
Jian Hui Guan, Élfego Ruiz-Gutiérrez, Ben Bin Xu, David Wood, Glen McHale, Rodrigo Ledesma-Aguilar, Gary George Wells
We demonstrate the transport and positioning of water droplets on macro-patterned lubricant-impregnated surfaces. The macro-patterning produces menisci features in the impregnating liquid layer which interact with a droplet via a capillary mechanism similar to the Cheerios effect. These interactions control the droplet motion and positioning on an otherwise completely slippery surface. We present experimental results using a V-shape channel geometry as a model system. The interaction between deformations on the lubricant layer induced by the droplet and the underlying V-shape geometry leads to both local and global equilibrium positions for the droplet within the channel...
April 21, 2017: Soft Matter
https://www.readbyqxmd.com/read/28427651/ultrasonic-synthesis-of-two-nanostructured-cadmium-ii-coordination-supramolecular-polymers-solvent-influence-luminescence-and-photocatalytic-properties
#7
Shao Yun Hao, Xue Gang Ma, Guang Hua Cui
Two nanoparticles of cadmium(II) coordination polymers (CPs) formulated as [Cd(L)(DCTP)]n (1) and [Cd(L)2(DCTP)·2H2O]n (2) (L=1,2-bis(2-methylbenzimidazol-1-ylmethyl)benzene, H2DCTP=2,5-dichloroterephthalic acid) were prepared by the sonochemical approach in different solvents and characterized by elemental analysis, IR spectra, scanning electron microscopy (SEM), and powder X-ray diffraction. Structural determination reveals that CP 1 displays a 2D four-connected sql net layer, Whilst CP 2 exhibits a 1D "V"-like chain structure...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28426060/hierarchically-scaffolded-cop-cop2-nanoparticles-controllable-synthesis-and-their-application-as-a-well-matched-bifunctional-electrocatalyst-for-overall-water-splitting
#8
Wan Li, Shilin Zhang, Qining Fan, Fazhi Zhang, Sailong Xu
Transition metal phosphide (TMP) nanostructures have stimulated increasing interest for use in water splitting owing to their abundant natural sources and high activity for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Typically, the preparation of hierarchical TMPs involves the utilization of expensive or dangerous phosphorus sources, and, in particular, the understanding of topotactic transformations of the precursors to crystalline phases-which could be utilized to enhance electrocatalytic performance-remains very limited...
April 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28426040/enhancement-of-the-hole-conducting-effect-of-nio-by-a-n2-blow-drying-method-in-printable-perovskite-solar-cells-with-low-temperature-carbon-as-the-counter-electrode
#9
T A Nirmal Peiris, Ajay K Baranwal, Hiroyuki Kanda, Shota Fukumoto, Shusaku Kanaya, Ludmila Cojocaru, Takeru Bessho, Tsutomu Miyasaka, Hiroshi Segawa, Seigo Ito
In this article, we demonstrate for the first time a mesoscopic printable perovskite solar cell (PSC) using NiO as the hole transporting material and low-temperature processed carbon as the counter electrode. A single deposition method assisted by N2 blow drying was used for the deposition of MAPbI3 on a TiO2/ZrO2/NiO screen-printed electrode. As the final step a low-temperature processing (i.e. 75 °C) carbon counter layer was fabricated on MAPbI3 by a blade coating method. It is found that the capping layer thickness of MAPbI3 has a significant effect on the device efficiency, especially when NiO is introduced as a hole transporting material into the structure...
April 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28426038/evaluation-of-the-dgt-technique-for-selective-measurement-of-aluminium-and-trace-metal-concentrations-in-an-acid-drainage-impacted-coastal-waterway
#10
Amir Houshang Shiva, Peter R Teasdale, David T Welsh, William W Bennett
The performance of DGT-Chelex, DGT-Metsorb and DGT-MBL (Chelex-Metsorb mixed binding layer) with open and restricted diffusive layers for trace metal (Al, Cd, Co, Cu, Mn, Ni, Pb, Zn) and oxyanion (As, Mo, Sb, V) measurements, was evaluated in four natural waters with different pH (range 3.29-7.81). In moderately acidic (pH ≈ 5) and circumneutral (pH ≈ 6.3) waters, all three binding layers measured relatively similar concentrations of Al, while in more alkaline waters (pH ≈ 8) DGT-MBL measured higher concentrations than the other two binding layers...
April 20, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28425281/hybridized-c-o-si-interface-states-at-the-origin-of-efficiency-improvement-in-cnt-si-solar-cell
#11
Stefano Ponzoni, Simona Achilli, Chiara Pintossi, Giovanni Drera, Luigi Sangaletti, Paola Castrucci, Maurizio De Crescenzi, Stefania Pagliara
Despite the astonishing values of the power conversion efficiency reached, in just less than a decade, by the carbon nanotube / silicon (CNT/Si) solar cells, many doubts remain on the underlying transport mechanisms across the CNT/Si heterojunction. Here, by combining transient optical spectroscopy in the femtosecond timescale, X-ray photoemission and a systematic tracking of I-V curves across all phases of the interlayer SiOx growth at the interface, we grasp the mechanism that adequately preserves charge separation at the junction, hindering the photoexcited carrier recombination...
April 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28424591/bcl11b-a-critical-neurodevelopmental-transcription-factor-roles-in-health-and-disease
#12
REVIEW
Matthew J Lennon, Simon P Jones, Michael D Lovelace, Gilles J Guillemin, Bruce J Brew
B cell leukemia 11b (Bcl11b) is a zinc finger protein transcription factor with a multiplicity of functions. It works as both a genetic suppressor and activator, acting directly, attaching to promoter regions, as well as indirectly, attaching to promoter-bound transcription factors. Bcl11b is a fundamental transcription factor in fetal development, with important roles for the differentiation and development of various neuronal subtypes in the central nervous system (CNS). It has been used as a specific marker of layer V subcerebral projection neurons as well as striatal interneurons...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28422658/equivalent-magnetic-noise-in-magnetoelectric-laminates-comprising-bidomain-linbo-sub-3-sub-crystals
#13
Joao Vidal, Andrey V Turutin, Ilya V Kubasov, Mikhail D Malinkovich, Yurii N Parkhomenko, Svetlana P Kobeleva, Andrei L Kholkin, Nikolai A Sobolev
The anisotropic direct magnetoelectric (ME) properties of bi-layered composites comprising magnetostrictive metglas foils and single-crystalline piezoelectric bidomain plates of 127ºY-cut LiNbO<sub>3<sub> (LNO) have been studied theoretically and experimentally. The LNO plates possessed an engineered ferroelectric macrobidomain structure with opposite spontaneous polarization vectors. Impedance, ME effect and equivalent magnetic noise density measurements have been performed under quasi-static and resonant conditions...
April 13, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28422218/the-nanostructure-of-a-lithium-glyme-solvate-ionic-liquid-at-electrified-interfaces
#14
Samuel W Coles, Maksim Mishin, Susan Perkin, Maxim V Fedorov, Vladislav B Ivaništšev
Solvate ionic liquids are a subclass of ionic liquids that have the potential to be used in a range of electrochemical devices. We present molecular dynamics simulations of the interfacial structure of thin films of one such lithium based solvate ionic liquid, [Li(G4)][TFSI], an equimolar solution of tetraglyme and lithium bistriflimide. This solvate ionic liquid is shown to form a novel interfacial structure at a plane electrode, which differs in a number of ways from the nanostructure observed for a conventional ionic liquid at similar interfaces...
April 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28422160/efficient-electrical-control-of-thin-film-black-phosphorus-bandgap
#15
Bingchen Deng, Vy Tran, Yujun Xie, Hao Jiang, Cheng Li, Qiushi Guo, Xiaomu Wang, He Tian, Steven J Koester, Han Wang, Judy J Cha, Qiangfei Xia, Li Yang, Fengnian Xia
Recently rediscovered black phosphorus is a layered semiconductor with promising electronic and photonic properties. Dynamic control of its bandgap can allow for the exploration of new physical phenomena. However, theoretical investigations and photoemission spectroscopy experiments indicate that in its few-layer form, an exceedingly large electric field in the order of several volts per nanometre is required to effectively tune its bandgap, making the direct electrical control unfeasible. Here we reveal the unique thickness-dependent bandgap tuning properties in intrinsic black phosphorus, arising from the strong interlayer electronic-state coupling...
April 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28421432/regeneration-of-jejunal-wall-defect-using-an-implant-based-on-silk-fibroin-fibers
#16
M M Moisenovich, D A Kulikov, A V Goncharenko, A Y Arkhipova, T V Vasiljeva, Yu N Filyushkin, L V Arkhipova, M S Kotlyarova, A V Kulikov, A E Mashkov, I I Agapov, M P Kirpichnikov
Regenerative properties of fibroin implant vitalized with allogeneic bone marrow cells were assessed. The study was performed using the experimental model of rat jejunum wall damage. Three weeks after surgery, we observed recovery of all layers of the jejunum wall at the site of injury and complete degradation of the implant material.
January 2017: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28418382/structure-of-the-hexagonal-surface-layer-on-caulobacter-crescentus-cells
#17
Tanmay A M Bharat, Danguole Kureisaite-Ciziene, Gail G Hardy, Ellen W Yu, Jessica M Devant, Wim J H Hagen, Yves V Brun, John A G Briggs, Jan Löwe
Many prokaryotic cells are encapsulated by a surface layer (S-layer) consisting of repeating units of S-layer proteins. S-layer proteins are a diverse class of molecules found in Gram-positive and Gram-negative bacteria and most archaea(1-5). S-layers protect cells from the outside, provide mechanical stability and also play roles in pathogenicity. In situ structural information about this highly abundant class of proteins is scarce, so atomic details of how S-layers are arranged on the surface of cells have remained elusive...
April 18, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28418250/identifying-the-active-surfaces-of-electrochemically-tuned-licoo2-for-oxygen-evolution-reaction
#18
Zhiyi Lu, Guangxu Chen, Yanbin Li, Haotian Wang, Jin Xie, Lei Liao, Chong Liu, Yayuan Liu, Tong Wu, Yuzhang Li, Alan C Luntz, Michal Bajdich, Yi Cui
Identification of active sites for catalytic processes has both fundamental and technological implications for rational design of future catalysts. Herein, we study the active surfaces of layered lithium cobalt oxide (LCO) for the oxygen evolution reaction (OER) using the enhancement effect of electrochemical delithiation (De-LCO). Our theoretical results indicate that the most stable (0001) surface has a very large overpotential for OER independent of lithium content. In contrast, edge sites such as the nonpolar (112̅0) and polar (011̅2) surfaces are predicted to be highly active and dependent on (de)lithiation...
April 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28417480/efficient-red-perovskite-light-emitting-diodes-based-on-solution-processed-multiple-quantum-wells
#19
Shuting Zhang, Chang Yi, Nana Wang, Yan Sun, Wei Zou, Yingqiang Wei, Yu Cao, Yanfeng Miao, Renzhi Li, Yao Yin, Ni Zhao, Jianpu Wang, Wei Huang
This paper reports a facile and scalable process to achieve high performance red perovskite light-emitting diodes (LEDs) by introducing inorganic Cs into multiple quantum well (MQW) perovskites. The MQW structure facilitates the formation of cubic CsPbI3 perovskites at low temperature, enabling the Cs-based QWs to provide pure and stable red electroluminescence. The versatile synthesis of MQW perovskites provides freedom to control the crystallinity and morphology of the emission layer. It is demonstrated that the inclusion of chloride can further improve the crystallization and consequently the optical properties of the Cs-based MQW perovskites, inducing a low turn-on voltage of 2...
April 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28417128/surface-reactivity-and-vacancy-defects-in-single-layer-borophene-polymorphs
#20
Vadym V Kulish
Single-layer borophene is a novel 2D material which combines high strength, light weight and metallicity. Using first-principles calculations, we systematically investigate the defect formation and surface reactivity in three major borophene polymorphs (α, β and triangular). We find that β-B is generally the most reactive borophene form, while α-B is the least reactive. In particular, there is more than 1.5 eV difference in substitutional energies for typical dopants in β-B and α-B polymorphs. Single vacancy defects can be created quite easily in all borophene sheets with formation energies (0...
April 18, 2017: Physical Chemistry Chemical Physics: PCCP
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