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https://www.readbyqxmd.com/read/28447983/high-temperature-fabrication-of-nanostructured-yttria-stabilized-zirconia-ysz-scaffolds-by-in-situ-carbon-templating-xerogels
#1
Sixbert P Muhoza, Matthew A Cottam, Michael D Gross
We demonstrate a method for the high temperature fabrication of porous, nanostructured yttria-stabilized-zirconia (YSZ, 8 mol% yttria - 92 mol% zirconia) scaffolds with tunable specific surface areas up to 80 m(2)·g(-1). An aqueous solution of a zirconium salt, yttrium salt, and glucose is mixed with propylene oxide (PO) to form a gel. The gel is dried under ambient conditions to form a xerogel. The xerogel is pressed into pellets and then sintered in an argon atmosphere. During sintering, a YSZ ceramic phase forms and the organic components decompose, leaving behind amorphous carbon...
April 16, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28447883/c-h-infrared-absorption-and-solubility-of-ethylene-propyne-2-methyl-2-butene-and-2-methyl-1-3-butadiene-isoprene-in-liquid-argon-solutions
#2
Parashu R Nyaupane, Helena Diez-Y-Riega, Daniel Cordier, Carlos E Manzanares
The solubility of ethylene (H2C=CH2), propyne (CH3-C≡C-H), 2-methyl-2-butene (CH3-CH=C(CH3)2), and isoprene or 2-methyl-1, 3-butadiene (H2C=C(CH3)-CH=CH2) in liquid argon has been measured using mid-infrared and near-infrared (NIR) absorption. Spectra were recorded in the C-H infrared (IR) region. Spectra were obtained at increasing solution composition until the magnitude of the integrated absorption band reached a maximum value, indicating a saturated solution. The approximate experimental solubilities are: (600 ± 100) ppm at 92 K for ethylene, (22 ± 9) ppm at 100 K for propyne, (9 ± 5) ppm at 100 K for 2-methyl-2-butene, and (12 ± 2) ppm at 86 K for isoprene...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28447477/simultaneous-visualization-of-hydrogen-peroxide-and-water-concentrations-using-photofragmentation-laser-induced-fluorescence
#3
Kajsa Larsson, Marcus Aldén, Joakim Bood
A concept based on photofragmentation laser-induced fluorescence (PFLIF) is for the first time demonstrated for simultaneous detection of hydrogen peroxide (H2O2) and water (H2O) vapor in various mixtures containing the two constituents in a bath of argon gas. A photolysis laser pulse at 248 nm dissociates H2O2 into OH fragments, whereupon a probe pulse, delayed 100 ns and tuned to an absorption line in the A(2)Σ(+) (v = 1) ← X(2)Π(v = 0) band of OH near 282 nm, induces fluorescence. The total OH fluorescence reflects the H2O2 concentration, while its spectral shape is utilized to determine the H2O concentration via a model predicting the ratio between the fluorescence intensities of the A(2)Σ(+) (v = 1) → X(2)Π(v = 1) and the A(2)Σ(+) (v = 0) → X(2)Π(v = 0) bands...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28446023/removing-biofilms-from-stainless-steel-without-changing-surface-properties-relevant-for-bacterial-attachment
#4
Katharina Huttenlochner, Christine Müller-Renno, Christiane Ziegler, Rolf Merz, Birgit Merz, Michael Kopnarski, Jonas Chodorski, Christin Schlegel, Roland Ulber
The influence of oxygen (and argon) plasma cleaning and a base-acid cleaning procedure on stainless steel surfaces was studied. The main aim was to clean stainless steel samples from Paracoccus seriniphilus biofilms without changing the surface properties which are relevant for bacterial attachment to allow reuse in a biofilm reactor. It is shown that oxygen plasma cleaning, which very successfully removes the same kind of biofilm from titanium surfaces, is not suitable for stainless steel. It largely influences the surface chemistry by producing thick metal oxide layers of varying compositions and changing phenomenological surface properties such as wettability...
April 26, 2017: Biointerphases
https://www.readbyqxmd.com/read/28446019/a-novel-fusion-bead-procedure-for-nuclear-forensics-employing-synthetic-enstatite-to-dissolve-uraniferous-and-other-challenging-materials-prior-to-la-icp-ms
#5
David G Reading, Ian W Croudace, Phillip Edward Warwick
There is an increasing demand for rapid and effective analytical tools to support nuclear forensic investigations of seized or suspect materials. Some methods are simply adapted from other scientific disciplines and can effectively be used to rapidly prepare complex materials for subsequent analysis. A novel sample fusion method is developed, tested and validated to produce homogeneous, flux-free glass beads of geochemical reference materials (GRMs), uranium ores, and uranium ore concentrates (UOC) prior to the analysis of 14 rare earth elements (REE) via LA-ICP-MS...
April 27, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28433997/argon-delays-initiation-of-liver-regeneration-after-partial-hepatectomy-in-rats
#6
Tom Florian Ulmer, Athanassious Fragoulis, Henriette Dohmeier, Andreas Kroh, Anne Andert, Christian Stoppe, Hamid Alizai, Christian Klink, Mark Coburn, Ulf Peter Neumann
BACKGROUND: The liver can heal up to restitutio ad integrum following damage resulting from various causes. Different studies have demonstrated the protective effect of argon on various cells and organs. To the best of our knowledge, the organ-protective effects of the noble gas argon on the liver have not yet been investigated, although argon appears to influence signal paths that are well-known mediators of liver regeneration. We hypothesized that argon inhalation prior to partial hepatectomy (70%) has a positive effect on the initiation of liver regeneration in rats...
April 22, 2017: European Surgical Research. Europäische Chirurgische Forschung. Recherches Chirurgicales Européennes
https://www.readbyqxmd.com/read/28431336/beam-induced-back-streaming-electron-suppression-analysis-for-an-accelerator-type-neutron-generator-designed-for-40-ar-39-ar-geochronology
#7
Cory Waltz, Mauricio Ayllon, Tim Becker, Lee Bernstein, Ka-Ngo Leung, Leo Kirsch, Paul Renne, Karl Van Bibber
A facility based on a next-generation, high-flux D-D neutron generator has been commissioned and it is now operational at the University of California, Berkeley. The current generator designed for (40)Ar/(39)Ar dating of geological materials produces nearly monoenergetic 2.45MeV neutrons at outputs of 10(8)n/s. The narrow energy range is advantageous relative to the (235)U fission spectrum neutrons due to (i) reduced (39)Ar recoil energy, (ii) minimized production of interfering argon isotopes from K, Ca, and Cl, and (iii) reduced total activity for radiological safety and waste generation...
April 13, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28430519/energy-resolved-ultrashort-delays-of-photoelectron-emission-clocked-by-orthogonal-two-color-laser-fields
#8
Xiaochun Gong, Cheng Lin, Feng He, Qiying Song, Kang Lin, Qinying Ji, Wenbin Zhang, Junyang Ma, Peifen Lu, Yunquan Liu, Heping Zeng, Weifeng Yang, Jian Wu
A phase-controlled orthogonal two-color (OTC) femtosecond laser pulse is employed to probe the time delay of photoelectron emission in the strong-field ionization of atoms. The OTC field spatiotemporally steers the emission dynamics of the photoelectrons and meanwhile allows us to unambiguously distinguish the main and sideband peaks of the above-threshold ionization spectrum. The relative phase shift between the main and sideband peaks, retrieved from the phase-of-phase of the photoelectron spectrum as a function of the laser phase, gradually decreases with increasing electron energy, and becomes zero for the fast electron which is mainly produced by the rescattering process...
April 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28430263/energetic-materials-identification-by-laser-induced-breakdown-spectroscopy-combined-with-artificial-neural-network
#9
Amir Hossein Farhadian, Masoud Kavosh Tehrani, Mohammad Hossein Keshavarz, Seyyed Mohammad Reza Darbani
In this study, for the first time to the best of our knowledge, a combination of the laser-induced breakdown spectroscopy (LIBS) technique and artificial neural network (ANN) analysis has been implemented for the identification of energetic materials, including TNT, RDX, black powder, and propellant. Also, aluminum, copper, inconel, and graphite have been used for more accurate investigation and comparison. After the LIBS test and spectrum acquisition on all samples in both air and argon ambient, optimized neural networks were designed by LIBS data...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28430259/impact-of-assisting-atmospheric-pressure-plasma-on-the-formation-of-micro-and-nanoparticles-during-picosecond-laser-ablation-of-titanium
#10
Stefan Grottker, Wolfgang Viöl, Christoph Gerhard
In this work, we investigated the generation of particles during pure laser and plasma-assisted laser ablation of titanium. Experiments were performed using a NIR picosecond laser at a wavelength of 1030 nm and a pulse duration of 8 ps. For plasma-assisted ablation, an atmospheric pressure dielectric barrier discharge plasma was applied where the process gas was argon. Quantitative particle distributions at sizes from 10 nm to 10 μm were determined. In addition, we evaluated the amount of ablated material via laser scanning microscopy...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28429782/electrochemical-generation-of-sulfur-vacancies-in-the-basal-plane-of-mos2-for-hydrogen-evolution
#11
Charlie Tsai, Hong Li, Sangwook Park, Joonsuk Park, Hyun Soo Han, Jens K Nørskov, Xiaolin Zheng, Frank Abild-Pedersen
Recently, sulfur (S)-vacancies created on the basal plane of 2H-molybdenum disulfide (MoS2) using argon plasma exposure exhibited higher intrinsic activity for the electrochemical hydrogen evolution reaction than the edge sites and metallic 1T-phase of MoS2 catalysts. However, a more industrially viable alternative to the argon plasma desulfurization process is needed. In this work, we introduce a scalable route towards generating S-vacancies on the MoS2 basal plane using electrochemical desulfurization. Even though sulfur atoms on the basal plane are known to be stable and inert, we find that they can be electrochemically reduced under accessible applied potentials...
April 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28422070/one-year-follow-up-risk-assessment-in-skh-1-mice-and-wounds-treated-with-an-argon-plasma-jet
#12
Anke Schmidt, Thomas von Woedtke, Jan Stenzel, Tobias Lindner, Stefan Polei, Brigitte Vollmar, Sander Bekeschus
Multiple evidence in animal models and in humans suggest a beneficial role of cold physical plasma in wound treatment. Yet, risk assessment studies are important to further foster therapeutic advancement and acceptance of cold plasma in clinics. Accordingly, we investigated the longterm side effects of repetitive plasma treatment over 14 consecutive days in a rodent full-thickness ear wound model. Subsequently, animals were housed for 350 days and sacrificed thereafter. In blood, systemic changes of the proinflammatory cytokines interleukin 1β and tumor necrosis factor α were absent...
April 19, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28418638/silver-film-surface-modification-by-ion-bombardment-decreases-surface-plasmon-resonance-absorption
#13
David M Fryauf, Juan Jose Diaz Leon, Andrew C Phillips, Nobuhiko Paul Kobayashi
Silver thin films covered with dielectric films serving as protective coatings are desired for telescope mirrors, but durable coatings have proved elusive. As part of an effort to develop long-lived protected-silver mirrors, silver thin films were deposited by electron beam evaporation using a physical vapor deposition system at the University of California Observatories Astronomical Coatings Lab. The silver films were later covered with a stack of dielectric films utilizing silicon nitride and titanium dioxide deposited by ion assisted electron beam evaporation to fabricate protected mirrors...
April 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28417898/nanoscale-influence-on-photoluminescence-and-third-order-nonlinear-susceptibility-exhibited-by-ion-implanted-pt-nanoparticles-in-silica
#14
Jhovani Bornacelli, Carlos Torres-Torres, Hector Silva-Pereyra, Luis Rodriguez-Fernandez, Miguel Avalos-Borja, Juan Cheang-Wong, Alicia Oliver
The authors describe a systematic study about photoluminescence and third order nonlinear ultraviolet properties exhibited by platinum nanoparticles nucleated in a high-purity silica matrix. The modification in the characteristic photoluminescence spectra of the nanocomposites, range between 400 to 600 nm, was obtained by the assistance of a thermal annealing process that changed the average size of the platinum nanoparticles. The influence of temperature between 200-1100 °C during the thermal treatment of the nanostructures was analyzed...
April 18, 2017: Methods and Applications in Fluorescence
https://www.readbyqxmd.com/read/28415275/effects-of-surface-roughness-on-shear-viscosity
#15
Michail Papanikolaou, Michael Frank, Dimitris Drikakis
This paper investigates the effect of surface roughness on fluid viscosity using molecular dynamics simulations. The three-dimensional model consists of liquid argon flowing between two solid walls whose surface roughness was modeled using fractal theory. In tandem with previously published experimental work, our results show that, while the viscosity in smooth channels remains constant across the channel width, in the presence of surface roughness it increases close to the walls. The increase of the boundary viscosity is further accentuated by an increase in the depth of surface roughness...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28415177/influence-of-atomic-kinetics-in-the-simulation-of-plasma-microscopic-properties-and-thermal-instabilities-for-radiative-bow-shock-experiments
#16
G Espinosa, R Rodríguez, J M Gil, F Suzuki-Vidal, S V Lebedev, A Ciardi, J G Rubiano, P Martel
Numerical simulations of laboratory astrophysics experiments on plasma flows require plasma microscopic properties that are obtained by means of an atomic kinetic model. This fact implies a careful choice of the most suitable model for the experiment under analysis. Otherwise, the calculations could lead to inaccurate results and inappropriate conclusions. First, a study of the validity of the local thermodynamic equilibrium in the calculation of the average ionization, mean radiative properties, and cooling times of argon plasmas in a range of plasma conditions of interest in laboratory astrophysics experiments on radiative shocks is performed in this work...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28414947/application-of-pyrolysis-to-recycling-organics-from-waste-tantalum-capacitors
#17
Bo Niu, Zhenyang Chen, Zhenming Xu
Tantalum capacitors (TCs) are widely used in electronic appliances. The rapid replacement of electronic products results in generating large amounts of waste TCs (WTCs). WTCs, rich in valuable tantalum, are considered as high quality tantalum resources for recycling. However, environmental pollution will be caused if the organics of WTCs were not properly disposed. Therefore, effectively recycling the organics of WTCs is significant for recovering the valuable parts. This study proposed an argon (Ar) pyrolysis process to recycle the organics from WTCs...
April 9, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28413496/clinical-observation-of-the-efficacy-of-bevacizumab-combined-with-argon-green-laser-in-treating-fundus-macular-edema
#18
Yi Shao, Yao Yu, Cheng Li, Chong-Gang Pei, Ping Tu, Yun Han, Gui-Ping Gao
We studied the clinical efficacy of Bevacizumab combined with argon green laser in treating fundus macular edema. From May 2009 to April 2013, 78 patients seeking treatment for macular edema in the First Affiliated Hospital of Nanchang University were enrolled in this study. Patients were randomly divided into two groups: i) The experimental group (n=39) and the control group (n=39). Patients in the experimental group were treated with Bevacizumab (Avastin(®)) combined with argon green laser, and those in the control group were treated exclusively with argon green laser...
April 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28411539/microwave-atmospheric-pressure-plasma-jets-for-wastewater-treatment-degradation-of-methylene-blue-as-a-model-dye
#19
María C García, Manuel Mora, Dolores Esquivel, John E Foster, Antonio Rodero, César Jiménez-Sanchidrián, Francisco J Romero-Salguero
The degradation of methylene blue in aqueous solution as a model dye using a non thermal microwave (2.45 GHz) plasma jet at atmospheric pressure has been investigated. Argon has been used as feed gas and aqueous solutions with different concentrations of the dye were treated using the effluent from plasma jet in a remote exposure. The removal efficiency increased as the dye concentration decreased from 250 to 5 ppm. Methylene blue degrades after different treatment times, depending on the experimental plasma conditions...
April 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/28410629/conservative-management-of-massive-pneumoperitoneum-after-argon-plasma-coagulation
#20
Laura Fernández Gómez-Cruzado, Mikel Prieto Calvo, Eva Alonso Calderón, Jasone Larrea Oleaga, Teresa Marquina Tobalina
No abstract text is available yet for this article.
April 11, 2017: Cirugía Española
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