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https://www.readbyqxmd.com/read/28098835/an-electrostatic-barrier-forming-window-that-captures-airborne-pollen-grains-to-prevent-pollinosis
#1
Yoshihiro Takikawa, Yoshinori Matsuda, Teruo Nonomura, Koji Kakutani, Shin-Ichi Kusakari, Hideyoshi Toyoda
An electrostatic-barrier-forming window (EBW) was devised to capture airborne pollen, which can cause allergic pollinosis. The EBW consisted of three layers of insulated conductor wires (ICWs) and two voltage generators that supplied negative charges to the two outer ICW layers and a positive charge to the middle ICW layer. The ICWs generated an attractive force that captured pollen of the Japanese cedar, Cryptomeria japonica, from air blown through the EBW. The attractive force was directly proportional to the applied voltage...
January 15, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28098299/vacancies-in-functional-materials-for-clean-energy-storage-and-harvesting-the-perfect-imperfection
#2
Guowei Li, Graeme R Blake, Thomas T M Palstra
Vacancies exist throughout nature and determine the physical properties of materials. By manipulating the density and distribution of vacancies, it is possible to influence their physical properties such as band-gap, conductivity, magnetism, etc. This can generate exciting applications in the fields of water treatment, energy storage, and physical devices such as resistance-change memories. In this review, we focus on recent progress in vacancy engineering for the design of materials for energy harvesting applications...
January 18, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28098240/metal-insulator-transition-of-strained-smnio3-thin-films-structural-electrical-and-optical-properties
#3
B Torriss, J Margot, M Chaker
Samarium nickelate (SmNiO3) thin films were successfully synthesized on LaAlO3 and SrTiO3 substrates using pulsed-laser deposition. The Mott metal-insulator (MI) transition of the thin films is sensitive to epitaxial strain and strain relaxation. Once the strain changes from compressive to tensile, the transition temperature of the SmNiO3 samples shifts to slightly higher values. The optical conductivity reveals the strong dependence of the Drude spectral weight on the strain relaxation. Actually, compressive strain broadens the bandwidth...
January 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28096330/spectroscopic-evidence-for-bulk-band-inversion-and-three-dimensional-massive-dirac-fermions-in-zrte5
#4
Zhi-Guo Chen, R Y Chen, R D Zhong, John Schneeloch, C Zhang, Y Huang, Fanming Qu, Rui Yu, Q Li, G D Gu, N L Wang
Three-dimensional topological insulators (3D TIs) represent states of quantum matters in which surface states are protected by time-reversal symmetry and an inversion occurs between bulk conduction and valence bands. However, the bulk-band inversion, which is intimately tied to the topologically nontrivial nature of 3D Tis, has rarely been investigated by experiments. Besides, 3D massive Dirac fermions with nearly linear band dispersions were seldom observed in TIs. Recently, a van der Waals crystal, ZrTe5, was theoretically predicted to be a TI...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28095540/multi-center-pilot-study-to-evaluate-the-safety-pro-le-of-high-energy-fractionated-radiofrequency-with-insulated-microneedles-to-multiple-levels-of-the-dermis
#5
Joel L Cohen, Steven F Weiner, Jason N Pozner, Omar A Ibrahimi, David B Vasily, E Victor Ross, Zena Gabriel
In this multi-center pilot study, the safety pro le of high intensity focused radiofrequency (RF) delivered to the dermis was evaluated for safety in the treatment of the aging neck and face. A newly designed insulated microneedle system delivers a signi cant coagulative thermal injury into the dermis while sparing the epidermis from RF injury. Thirty- ve healthy subjects from seven aesthetic practices were evaluated, and data from each were incorporated in this case report. The subjects received a single treatment using settings that delivered the highest RF energies suggested from the new recommended protocols...
November 1, 2016: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28095198/effects-of-small-world-rewiring-probability-and-noisy-synaptic-conductivity-on-slow-waves-cortical-network
#6
Ramazan Tekin, Mehmet Emin Tagluk
Physiological rhythms play a critical role in the functional development of living beings. Many biological functions are executed with an interaction of rhythms produced by internal characteristics of scores of cells. While synchronized oscillations may be associated with normal brain functions, anomalies in these oscillations may cause or relate the emergence of some neurological or neuropsychological pathologies. This study was designed to investigate the effects of topological structure and synaptic conductivity noise on the spatial synchronization and temporal rhythmicity of the waves generated by cells in the network...
January 17, 2017: Neural Computation
https://www.readbyqxmd.com/read/28094366/band-gap-opening-in-stanene-induced-by-patterned-b-n-doping
#7
Priyanka Garg, Indrani Choudhuri, Arup Mahata, Biswarup Pathak
Stanene is a quantum spin Hall insulator and a promising material for electronic and optoelectronic devices. Density functional theory (DFT) calculations are performed to study the band gap opening in stanene by elemental mono-doping (B, N) and co-doping (B-N). Different patterned B-N co-doping is studied to change the electronic properties of stanene. A patterned B-N co-doping opens the band gap in stanene and its semiconducting nature persists under strain. Molecular dynamics (MD) simulations are performed to confirm the thermal stability of such a doped system...
January 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28094286/creating-stable-floquet-weyl-semimetals-by-laser-driving-of-3d-dirac-materials
#8
Hannes Hübener, Michael A Sentef, Umberto De Giovannini, Alexander F Kemper, Angel Rubio
Tuning and stabilizing topological states, such as Weyl semimetals, Dirac semimetals or topological insulators, is emerging as one of the major topics in materials science. Periodic driving of many-body systems offers a platform to design Floquet states of matter with tunable electronic properties on ultrafast timescales. Here we show by first principles calculations how femtosecond laser pulses with circularly polarized light can be used to switch between Weyl semimetal, Dirac semimetal and topological insulator states in a prototypical three-dimensional (3D) Dirac material, Na3Bi...
January 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28094258/interfacial-superconductivity-in-a-bi-collinear-antiferromagnetically-ordered-fete-monolayer-on-a-topological-insulator
#9
S Manna, A Kamlapure, L Cornils, T Hänke, E M J Hedegaard, M Bremholm, B B Iversen, Ph Hofmann, J Wiebe, R Wiesendanger
The discovery of high-temperature superconductivity in Fe-based compounds triggered numerous investigations on the interplay between superconductivity and magnetism, and on the enhancement of transition temperatures through interface effects. It is widely believed that the emergence of optimal superconductivity is intimately linked to the suppression of long-range antiferromagnetic (AFM) order, although the exact microscopic picture remains elusive because of the lack of atomically resolved data. Here we present spin-polarized scanning tunnelling spectroscopy of ultrathin FeTe1-xSex (x=0, 0...
January 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28093916/understanding-coulomb-scattering-mechanism-in-monolayer-mos2-channel-in-the-presence-of-h-bn-buffer-layer
#10
Min-Kyu Joo, Byoung Hee Moon, Hyunjin Ji, Gang Hee Han, Hyun Kim, Gwan Mu Lee, Seong Chu Lim, Dongseok Suh, Young Hee Lee
As the thickness becomes thinner, the importance of Coulomb scattering in two-dimensional layered materials increases because of the close proximity between channel and interfacial layer and the reduced screening effects. The Coulomb scattering in the channel is usually obscured mainly by the Schottky barrier at the contact in the noise measurements. Here, we report low-temperature (T) noise measurements to understand the Coulomb scattering mechanism in MoS2 channel in the presence of h-BN buffer layer on silicon dioxide (SiO2) insulating layer...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28092688/buckled-two-dimensional-xene-sheets
#11
Alessandro Molle, Joshua Goldberger, Michel Houssa, Yong Xu, Shou-Cheng Zhang, Deji Akinwande
Silicene, germanene and stanene are part of a monoelemental class of two-dimensional (2D) crystals termed 2D-Xenes (X = Si, Ge, Sn and so on) which, together with their ligand-functionalized derivatives referred to as Xanes, are comprised of group IVA atoms arranged in a honeycomb lattice - similar to graphene but with varying degrees of buckling. Their electronic structure ranges from trivial insulators, to semiconductors with tunable gaps, to semi-metallic, depending on the substrate, chemical functionalization and strain...
January 16, 2017: Nature Materials
https://www.readbyqxmd.com/read/28092687/a-charge-density-wave-like-instability-in-a-doped-spin-orbit-assisted-weak-mott-insulator
#12
H Chu, L Zhao, A de la Torre, T Hogan, S D Wilson, D Hsieh
Layered perovskite iridates realize a rare class of Mott insulators that are predicted to be strongly spin-orbit coupled analogues of the parent state of cuprate high-temperature superconductors. Recent discoveries of pseudogap, magnetic multipolar ordered and possible d-wave superconducting phases in doped Sr2IrO4 have reinforced this analogy among the single layer variants. However, unlike the bilayer cuprates, no electronic instabilities have been reported in the doped bilayer iridate Sr3Ir2O7. Here we show that Sr3Ir2O7 realizes a weak Mott state with no cuprate analogue by using ultrafast time-resolved optical reflectivity to uncover an intimate connection between its insulating gap and antiferromagnetism...
January 16, 2017: Nature Materials
https://www.readbyqxmd.com/read/28092153/removable-large-area-ultra-smooth-silver-nanowire-transparent-composite-electrode
#13
Yunxia Jin, Kaiqing Wang, Yuanrong Cheng, Qibing Pei, Yuxi Xu, Fei Xiao
In this work, a composite silver nanowire (AgNW) transparent electrode that is large-area ultra-smooth without conductivity or transmittance scarifice, removable but with good resistance to both water and organic solvent is reported. Via a simple low-temperature solution process without complicated transfer steps or additional pressure pressing, a new kind of AgNWs composite with biocompatible and patternable chitosan polymer complex demonstrates a quite low RMS (root mean square) roughness ~7 nm at a largest reported scan size of 50 μm*50 μm, which is among the best flat surface...
January 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28092142/identifying-the-collective-length-in-vo2-metal-insulator-transitions
#14
Takeaki Yajima, Tomonori Nishimura, Akira Toriumi
The "collective length" in VO2 metal-insulator transitions is identified by controlling nanoscale dopant distribution in thin films. The crossover from the local transition to the collective transition is observed, which originated from the increased instability of the metal-insulator domain boundary. This instability renders the transition collective within the "collective length," which will enable to design collective electronic devices.
January 16, 2017: Small
https://www.readbyqxmd.com/read/28092130/topological-valleytronic-and-optical-properties-of-monolayer-pbs
#15
Wenhui Wan, Yugui Yao, Liangfeng Sun, Cheng-Cheng Liu, Fan Zhang
A PbS monolayer is demonstrated to be a novel platform for topological, valleytronic, and optical phenomena. Compressive strain can turn the trivial monolayer into topological insulators. Optical pumping can facilitate charge, spin, and valley Hall effects tunable by external strain and light ellipticity. Similar results apply to other IV-VI semiconductors.
January 16, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28091651/composition-dependent-charge-transfer-and-phase-separation-in-the-v1-xrexo2-solid-solution
#16
D Mikhailova, N N Kuratieva, Y Utsumi, A A Tsirlin, A M Abakumov, M Schmidt, S Oswald, H Fuess, H Ehrenberg
The substitution of vanadium in vanadium dioxide VO2 influences the critical temperatures of structural and metal-to-insulator transitions in different ways depending on the valence of the dopant. Rhenium adopts valence states between +4 and +7 in an octahedral oxygen surrounding and is particularly interesting in this context. Structural investigation of V1-xRexO2 solid solutions (0.01 ≤ x ≤ 0.30) between 80 and 1200 K using synchrotron X-ray powder diffraction revealed only two polymorphs that resemble VO2: the low-temperature monoclinic MoO2-type form (space group P21/c), and the tetragonal rutile-like form (space group P42/mnm)...
January 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28091583/hybrid-dielectric-loaded-nanoridge-plasmonic-waveguide-for-low-loss-light-transmission-at-the-subwavelength-scale
#17
Bin Zhang, Yusheng Bian, Liqiang Ren, Feng Guo, Shi-Yang Tang, Zhangming Mao, Xiaomin Liu, Jinju Sun, Jianying Gong, Xiasheng Guo, Tony Jun Huang
The emerging development of the hybrid plasmonic waveguide has recently received significant attention owing to its remarkable capability of enabling subwavelength field confinement and great transmission distance. Here we report a guiding approach that integrates hybrid plasmon polariton with dielectric-loaded plasmonic waveguiding. By introducing a deep-subwavelength dielectric ridge between a dielectric slab and a metallic substrate, a hybrid dielectric-loaded nanoridge plasmonic waveguide is formed. The waveguide features lower propagation loss than its conventional hybrid waveguiding counterpart, while maintaining strong optical confinement at telecommunication wavelengths...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28088448/fast-formation-of-low-defect-density-tethered-bilayers-by-fusion-of-multilamellar-vesicles
#18
Tadas Ragaliauskas, Mindaugas Mickevicius, Bozena Rakovska, Tadas Penkauskas, David J Vanderah, Frank Heinrich, Gintaras Valincius
A facile and reproducible preparation of surface-supported lipid bilayers is essential for fundamental membrane research and biotechnological applications. We demonstrate that multilamellar vesicles fuse to molecular-anchor-grafted surfaces yielding low-defect-density, tethered bilayer membranes. Continuous bilayers are formed within 10min, while the electrically insulating bilayers with <0.1μm(-2) defect density can be accomplished within 60min. Surface plasmon resonance spectroscopy indicates that an amount of lipid material transferred from vesicles to a surface is inversely proportional to the density of an anchor, while the total amount of lipid that includes tethered and transferred lipid remains constant within 5% standard error...
January 11, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28087276/drosophila-argonaute2-turnover-is-regulated-by-the-ubiquitin-proteasome-pathway
#19
Madoka Chinen, Elissa P Lei
Argonaute (AGO) proteins play a central role in the RNA interference (RNAi) pathway, which is a cytoplasmic mechanism important for post-transcriptional regulation of gene expression. In Drosophila, AGO2 also functions in the nucleus to regulate chromatin insulator activity and transcription. Although there are a number of studies focused on AGO2 function, the regulation of AGO2 turnover is not well understood. We found that mutation of T1149 or R1158 in the conserved PIWI domain causes AGO2 protein instability, but only T1149 affects RNAi activity...
January 10, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28081363/distance-dependent-measurements-of-the-conductance-of-porphyrin-nanorods-studied-with-conductive-probe-atomic-force-microscopy
#20
Xianglin Zhai, Denzel Alexander, Pedro Derosa, Jayne C Garno
Protocols for nanopatterning porphyrins on Au(111) were developed based on immersion particle lithography. Porphyrins with and without a central metal ion, 5,10,15,20-tetraphenyl-21H,23H-porphyrin (TPP) and 5,10,15,20-tetraphenyl-21H,23H-porphyrin cobalt(II) (CoTPP) were selected for study, which spontaneously formed nanorod geometries depending on concentration parameters. The elongated shapes of the nanorods offers an opportunity for successive distance-dependent conductive probe-atomic force microscopy (CP-AFM) measurements along the length of the nanorods...
January 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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