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https://www.readbyqxmd.com/read/28532128/band-offset-measurements-in-atomic-layer-deposited-al2o3-zn0-8al0-2o-heterojunction-studied-by-x-ray-photoelectron-spectroscopy
#1
Baojun Yan, Shulin Liu, Yuekun Heng, Yuzhen Yang, Yang Yu, Kaile Wen
Pure aluminum oxide (Al2O3) and zinc aluminum oxide (Zn x Al1-x O) thin films were deposited by atomic layer deposition (ALD). The microstructure and optical band gaps (E g ) of the Zn x Al1-x O (0.2 ≤ x ≤ 1) films were studied by X-ray diffractometer and Tauc method. The band offsets and alignment of atomic-layer-deposited Al2O3/Zn0.8Al0.2O heterojunction were investigated in detail using charge-corrected X-ray photoelectron spectroscopy. In this work, different methodologies were adopted to recover the actual position of the core levels in insulator materials which were easily affected by differential charging phenomena...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28532076/sustained-drug-release-from-surface-modified-uhmwpe-for-acetabular-cup-lining-in-total-hip-implant
#2
R Manoj Kumar, Pallavi Gupta, Sandan Kumar Sharma, Akshat Mittal, Manish Shekhar, Vijayesh Kumar, B V Manoj Kumar, Partha Roy, Debrupa Lahiri
Despite sterilization and aseptic procedure, bacterial infection remains a key challenge in total hip arthroplasties. This fact emphasizes the urgent need for development of new implant systems, which should releases the drug in a controlled manner without sparing its mechanical and tribological properties. In this study, the lining material of the acetabular cup, in total hip implant, has been modified for sustained release of drugs, which should be available throughout the site of implantation to fight the post-operation bacterial infection...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532021/nanosecond-laser-ablation-enhances-cellular-infiltration-in-a-hybrid-tissue-scaffold
#3
S Jahnavi, N Arthi, S Pallavi, C Selvaraju, G S Bhuvaneshwar, T V Kumary, R S Verma
Hybrid tissue engineered (HTE) scaffolds constituting polymeric nanofibers and biological tissues have attractive bio-mechanical properties. However, they suffer from small pore size due to dense overlapping nanofibers resulting in poor cellular infiltration. In this study, using nanosecond (ns) laser, we fabricated micro-scale features on Polycaprolactone (PCL)-Chitosan (CH) nanofiber layered bovine pericardium based Bio-Hybrid scaffold to achieve enhanced cellular adhesion and infiltration. The laser energy parameters such as fluence of 25J/cm(2), 0...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28530829/highly-oriented-atomically-thin-ambipolar-mose2-grown-by-molecular-beam-epitaxy
#4
Ming-Wei Chen, Dmitry Ovchinnikov, Sorin Lazar, Michele Pizzochero, Michael Brian Whitwick, Alessandro Surrente, Michal Baranowski, Oriol Lopez Sanchez, Philippe Gillet, Paulina Plochocka, Oleg V Yazyev, Andras Kis
Transition metal dichalcogenides (TMDCs), together with other two-dimensional (2D) materials have attracted great interest due to the unique optical and electrical properties of atomically thin layers. In order to fulfill their potential, developing large-area growth and understanding the properties of TMDCs have become crucial. Here, we used molecular beam epitaxy (MBE) to grow atomically thin MoSe2 on GaAs(111)B. No intermediate compounds were detected at the interface of as-grown films. Careful optimization of the growth temperature can result in the growth of highly aligned films with only two possible crystalline orientations due to broken inversion symmetry...
May 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28530748/photomultiplication-type-narrowband-organic-photodetectors-working-at-forward-and-reverse-bias
#5
Jianli Miao, Fujun Zhang, Mingde Du, Wenbin Wang, Ying Fang
It is a great challenge to obtain narrowband and photomultiplication (PM) type organic photodetectors (OPDs) without optical filters due to the broad absorption range and large exciton binding energy of organic materials. Narrowband OPDs with the special structure of ITO/PFN-OX/P3HT : PC61BM (100 : 1,wt/wt)/Al were successfully fabricated with different active layer thicknesses, exhibiting a tunable response window and PM phenomenon under bi-directional bias. The OPDs exhibit U-shaped EQE spectra with two narrowband response windows under forward bias and a single narrowband response window under reverse bias...
May 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28529384/the-pelskin-project-part-v-towards-the-control-of-the-flow-around-aerofoils-at-high-angle-of-attack-using-a-self-activated-deployable-flap
#6
Marco E Rosti, Laura Kamps, Christoph Bruecker, Mohammad Omidyeganeh, Alfredo Pinelli
During the flight of birds, it is often possible to notice that some of the primaries and covert feathers on the upper side of the wing pop-up under critical flight conditions, such as the landing approach or when stalking their prey (see Fig. 1) . It is often conjectured that the feathers pop up plays an aerodynamic role by limiting the spread of flow separation . A combined experimental and numerical study was conducted to shed some light on the physical mechanism determining the feathers self actuation and their effective role in controlling the flow field in nominally stalled conditions...
2017: Meccanica
https://www.readbyqxmd.com/read/28528133/chemical-synthesis-of-flower-like-hybrid-cu-oh-2-cuo-electrode-application-of-polyvinyl-alcohol-and-triton-x-100-to-enhance-supercapacitor-performance
#7
S K Shinde, V J Fulari, D-Y Kim, N C Maile, R R Koli, H D Dhaygude, G S Ghodake
In this research article, we report hybrid nanomaterials of copper hydroxide/copper oxide (Cu(OH)2/CuO). A thin films were prepared by using a facile and cost-effective successive ionic layer adsorption and reaction (SILAR) method. As-synthesized and hybrid Cu(OH)2/CuO with two different surfactants polyvinyl alcohol (PVA) and triton-X 100 (TRX-100) was prepared having distinct morphological, structural, and supercapacitor properties. The surface of the thin film samples were examined by scanning electron microscopy (SEM)...
May 9, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28527978/enhanced-antimony-v-removal-using-synergistic-effects-of-fe-hydrolytic-flocs-and-ultrafiltration-membrane-with-sludge-discharge-evaluation
#8
Baiwen Ma, Xing Wang, Ruiping Liu, Zenglu Qi, William A Jefferson, Huachun Lan, Huijuan Liu, Jiuhui Qu
The integration of adsorbents with ultrafiltration (UF) membranes is a promising method for alleviating membrane fouling and reducing land use. However, a number of problems have become apparent concerning the granular adsorbents used currently, such as high running cost, high chance of causing membrane surface damage, low in situ chemical cleaning efficiency, etc. Herein, to overcome these disadvantages, loose in situ hydrolyzed flocs were directly injected into the membrane tank, providing strong adsorption ability at low cost...
May 13, 2017: Water Research
https://www.readbyqxmd.com/read/28527322/arsenic-biotransformation-by-a-cyanobacterium-nostoc-sp-pcc-7120
#9
Xi-Mei Xue, Yu Yan, Chan Xiong, Georg Raber, Kevin Francesconi, Ting Pan, Jun Ye, Yong-Guan Zhu
Nostoc sp. PCC 7120 (Nostoc), a typical filamentous cyanobacterium ubiquitous in aquatic system, is recognized as a model organism to study prokaryotic cell differentiation and nitrogen fixation. In this study, Nostoc cells incubated with arsenite (As(III)) for two weeks were extracted with dichloromethane/methanol (DCM/MeOH) and the extract was partitioned between water and DCM. Arsenic species in aqueous and DCM layers were determined using high performance liquid chromatography - inductively coupled plasma mass spectrometer/electrospray tandem mass spectrometry (HPLC-ICPMS/ESIMSMS)...
May 17, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28527185/surface-heparinization-and-blood-compatibility-modification-of-small-intestinal-submucosa-sis-for-small-caliber-vascular-regeneration
#10
Bensong Han, Feng Xue, Cunyi Fan, Xiumei Mo
OBJECTIVES: This study aims to investigate the small intestinal submucosal (SIS) surface after heparinization with the hypothermia plasma technique, to improve the blood compatibility of SIS, and to explore the possibility of construction of small-caliber vascular grafts with modified SIS scaffolds in vivo. METHODS: SIS films prepared from jejunums of pigs were processed for surface treatment at different time periods with the argon plasma initiation technique under vacuum, and were then immediately immersed in 4% (m/v) heparin sodium solution for 24-h heparinization...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28527002/design-and-development-of-amperometric-biosensor-for-the-detection-of-lead-and-mercury-ions-in-water-matrix-a-permeability-approach
#11
Manju Bhargavi Gumpu, Uma Maheswari Krishnan, John Bosco Balaguru Rayappan
Intake of water contaminated with lead (Pb(2+)) and mercury (Hg(2+)) ions leads to various toxic effects and health issues. In this context, an amperometric urease inhibition-based biosensor was developed to detect Pb(2+) and Hg(2+) ions in water matrix. The modified Pt/CeO2/urease electrode was fabricated by immobilizing CeO2 nanoparticles and urease using a semi-permeable adsorption layer of nafion. With urea as a substrate, urease catalytic activity was examined through cyclic voltammetry. Further, maximum amperometric inhibitive response of the modified Pt/CeO2/urease electrode was observed in the presence of Pb(2+) and Hg(2+) ions due to the urease inhibition at specific potentials of -0...
May 20, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28526863/potential-of-pedot-pss-as-a-hole-selective-front-contact-for-silicon-heterojunction-solar-cells
#12
Sara Jäckle, Martin Liebhaber, Clemens Gersmann, Mathias Mews, Klaus Jäger, Silke Christiansen, Klaus Lips
We show that the highly conductive polymer poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) can successfully be applied as a hole selective front contact in silicon heterojunction (SHJ) solar cells. In combination with a superior electron selective heterojunction back contact based on amorphous silicon (a-Si), mono-crystalline n-type silicon (c-Si) solar cells reach power conversion efficiencies up to 14.8% and high open-circuit voltages exceeding 660 mV. Since in the PEDOT:PSS/c-Si/a-Si solar cell the inferior hybrid junction is determining the electrical device performance we are capable of assessing the recombination velocity (v I ) at the PEDOT:PSS/c-Si interface...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28525707/self-organized-growth-of-two-dimensional-gate-nanosheet-on-zno-nanowires-for-heterojunctional-water-splitting-applications
#13
Qiuguo Li, Xinzhou Ma, Huiqiang Liu, Zuxin Chen, Hao Chen, Sheng Chu
Epitaxial two-demensional GaTe nanosheets on ZnO nanowires were routinely prepared via a two-step chemical vapour deposition procedure. The epitaxial relationship and growth mechanism of the GaTe/ZnO core/shell structures were explored and attributed to a layer-over-layer model. The hybrid structures increased the surface area and the favorable p-n heterojunction enhanced the charge separation for photoelectrochemical performance in water splitting. The above synergistic effects boosted the photocurrent density from -0...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28525574/a-schizophrenia-related-deletion-leads-to-kcnq2-dependent-abnormal-dopaminergic-modulation-of-prefrontal-cortical-interneuron-activity
#14
Se Joon Choi, Jun Mukai, Mirna Kvajo, Bin Xu, Anastasia Diamantopoulou, Pothitos M Pitychoutis, Bin Gou, Joseph A Gogos, Hui Zhang
Altered prefrontal cortex function is implicated in schizophrenia (SCZ) pathophysiology and could arise from imbalance between excitation and inhibition (E/I) in local circuits. It remains unclear whether and how such imbalances relate to genetic etiologies. We used a mouse model of the SCZ-predisposing 22q11.2 deletion (Df(16)A+/- mice) to evaluate how this genetic lesion affects the excitability of layer V prefrontal pyramidal neurons and its modulation by dopamine (DA). Df(16)A+/- mice have normal balance between E/I at baseline but are unable to maintain it upon dopaminergic challenge...
May 19, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28524862/antiferromagnetic-cumnas-multi-level-memory-cell-with-microelectronic-compatibility
#15
K Olejník, V Schuler, X Marti, V Novák, Z Kašpar, P Wadley, R P Campion, K W Edmonds, B L Gallagher, J Garces, M Baumgartner, P Gambardella, T Jungwirth
Antiferromagnets offer a unique combination of properties including the radiation and magnetic field hardness, the absence of stray magnetic fields, and the spin-dynamics frequency scale in terahertz. Recent experiments have demonstrated that relativistic spin-orbit torques can provide the means for an efficient electric control of antiferromagnetic moments. Here we show that elementary-shape memory cells fabricated from a single-layer antiferromagnet CuMnAs deposited on a III-V or Si substrate have deterministic multi-level switching characteristics...
May 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28524243/bulk-filled-posterior-resin-restorations-based-on-stress-decreasing-resin-technology-a-randomized-controlled-6-year-evaluation
#16
Jan W V van Dijken, Ulla Pallesen
This randomized study evaluated a flowable resin composite bulk-fill technique in posterior restorations and compared it intraindividually with a conventional 2-mm resin composite layering technique over a 6-yr follow-up period. Thirty-eight pairs of Class II restorations and 15 pairs of Class I restorations were placed in 38 adults. In all cavities a single-step self-etch adhesive (Xeno V) was applied. In the first cavity of each pair, the flowable resin composite (SDR) was placed, in bulk increments of up to 4 mm...
May 19, 2017: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/28524136/-clinical-evaluation-of-the-effectiveness-of-cholinesterase-inhibition-with-neuromidin-in-the-treatment-of-primary-glaucoma-patients
#17
I A Zakharova, R V Avdeev, V A Pristavka, S N Surnin, V Yu Makhmutov, I I Savrasova
AIM: to investigate neuromidin effectiveness in the treatment of patients with primary glaucoma and compensated intraocular pressure (IOP). MATERIAL AND METHODS: A total of 40 patients (80 eyes) were examined. Of them, 10 eyes with early glaucoma, 36 eyes with moderate-stage glaucoma, 33 eyes with advanced glaucoma, and 1 eye with end-stage glaucoma. In 19 eyes, IOP was controlled through beta-blockers, in 11 eyes - through carbonic anhydrase inhibitors, in 10 eyes - through prostaglandin analogues, and in 39 eyes - through combination drugs...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/28524134/-oct-morphometric-and-angiographic-parallels-between-different-variants-of-central-serous-chorioretinopathy
#18
I E Panova, T B Shaimov, V A Shaimova
Central serous chorioretinopathy (CSCR) is a frequent cause of vision deterioration. Often it is associated with type 1 neovascularization under the pigment retinal epithelium (RPE). Optical coherence tomography angiography (OCT-angiography) enables non-invasive and contrast-free detection of neovessels in any retinal layer, which makes the method appropriate for diagnostics in CSCR. AIM: to investigate OCT-morphometric and angiographic parallels between different CSCR courses. MATERIAL AND METHODS: The study included 37 patients with CSCR...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/28523755/asymmetric-supercapacitors-based-on-rgo-pmo12-as-a-positive-and-rgo-pw12-as-a-negative-electrode
#19
Deepak Dubal, Nilesh Chodankar, Ajayan Vinu, Do-Heyoung Kim, Pedro Gomez-Romero
Nanofabrication via "bottom-up" approach of hybrid electrode materials into well-defined architecture is essential for the next generation miniaturized energy storage devices. This paper describes the design and fabrication of reduced graphene oxide (rGO)/polyoxometalates (POMs) based hybrid electrode materials and their successful exploitation for asymmetric supercapacitor. Firstly, the redox active nanoclusters of POMs (phosphomolybdic acid (PMo12) and phosphotungstic acid (PW12)) are uniformly decorated on the surface of rGO nanosheets to take full advantage of both charge-storing mechanisms (faradaic from POMs and electric double layer from rGO)...
May 18, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28521101/creation-of-a-short-range-ordered-two-dimensional-electron-gas-channel-in-al2o3-in2o3-interfaces
#20
Sang Yeon Lee, Jinseo Kim, Ayoung Park, Jucheol Park, Hyungtak Seo
The tuning of electrical properties in oxides via surface and interfacial two-dimensional electron gas (2DEG) channels is of great interest, as they reveal the extraordinary transition from insulating or semiconducting characteristics to metallic conduction or superconductivity enabled by the ballistic transport of spatially confined electrons. However, realizing the practical aspects of this exotic phenomenon toward short-range ordered and air-stable 2DEG channels remains a great challenge. At the heterointerface formed after deposition of an Al2O3 layer on a nanocrystalline In2O3 layer, a dramatic improvement in carrier conduction equivalent to metallic conduction is obtained...
May 22, 2017: ACS Nano
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