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https://www.readbyqxmd.com/read/28449548/vibration-induced-property-change-in-the-melting-and-solidifying-process-of-metallic-nanoparticles
#1
Yonggang Zheng, Liquan Ding, Hongfei Ye, Zhen Chen
Tuning material properties in the 3-D printing process of metallic parts is a challenging task of current interests. Much research has been conducted to understand the effects of controlling parameters such as the particle geometry (size and shape), heating, and cooling ways on the outcome of the printing process. However, nothing has been done to explore the system vibration effect. This letter reports our findings on the vibration-induced property change in the melting and solidifying process of silver nanoparticles with the use of molecular dynamics simulation...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28448875/bioengineered-mannan-sulphate-capped-silver-nanoparticles-for-accelerated-and-targeted-wound-healing-physicochemical-and-biological-investigations
#2
Megha Mugade, Milind Patole, Varsha Pokharkar
In the present study, surface functionalized mannan sulphate silver nanoparticles (MS-AgNPs) were prepared and assessed for their wound healing potential. 20nm sized, spherical MS-AgNPs were prepared by one pot synthesis approach wherein the sulphated polysaccharide mannan sulphate (MS) played dual role of reducing as well as capping agent. The crystalline MS-AgNPs exhibited surface plasmon resonance centered at 400nm along with -32.40mV zeta potential. These stable MS-AgNPs showed enhanced cytocompatibility, targeting potential and cellular uptake in murine macrophages, human skin fibroblasts and human keratinocytes as compared to citrate reduced silver nanoparticles (C-AgNPs)...
April 24, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28448824/a-new-quantitative-method-to-assess-disproportionately-enlarged-subarachnoid-space-desh-in-patients-with-possible-idiopathic-normal-pressure-hydrocephalus-the-silver-index
#3
Nicola Benedetto, Carlo Gambacciani, Filippo Aquila, Davide Tiziano Di Carlo, Riccardo Morganti, Paolo Perrini
OBJECTIVES: Preoperative diagnosis of idiopathic normal-pressure hydrocephalus (iNPH) remains challenging. Recently, the presence of disproportionally enlarged subarachnoid spaces and hydrocephalus (DESH) on diagnostic images has been linked to clinical improvement after ventriculoperitoneal (VP) shunt placement. In this study we describe a new quantitative method to assess DESH on CT scans and to evaluate its prognostic value. PATIENTS AND METHODS: A multiplanar reconstruction software was used to retrospectively evaluate prospectively collected radiological data (CT scans) of 26 controls and 29 consecutive patients that underwent VP shunt placement for possible iNPH...
April 19, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/28448492/stylized-facts-of-intraday-precious-metals
#4
Jonathan Batten, Brian Lucey, Frank McGroarty, Maurice Peat, Andrew Urquhart
This paper examines the stylized facts, correlation and interaction between volatility and returns at the 5-minute frequency for gold, silver, platinum and palladium from May 2000 to April 2015. We study the full sample period, as well as three subsamples to determine how high-frequency data of precious metals have developed over time. We find that over the full sample, the number of trades has increased substantially over time for each precious metal, while the bid-ask spread has narrowed over time, indicating an increase in liquidity and price efficiency...
2017: PloS One
https://www.readbyqxmd.com/read/28448268/the-effect-of-pycnogenol-on-wound-healing-in-diabetic-rats
#5
Elif Dogan, Latif Yanmaz, Semin Gedikli, Ugur Ersoz, Zafer Okumus
Pycnogenol (PYC), an extract of pine bark, is known to have photoprotective, antimicrobial, antioxidant, and anti-inflammatory properties. An in vivo study was conducted to evaluate the effects of PYC treatment on wound healing in 48 adult male Sprague-Dawley rats, of which 24 were injected with a single dose of alloxan to induce diabetes. Three (3) excisional skin wounds (1.3 cm x 1.3 cm x 2 mm) were created in each healthy and diabetic animal. One (1) wound in each animal was left untreated, 1 was treated daily with a cleanser (ethacridine lactate) and covered with silver sulfadiazine (SSD), and 1 was treated with PYC powder (30 mg)...
April 2017: Ostomy/wound Management
https://www.readbyqxmd.com/read/28448134/total-mercury-released-to-the-environment-by-human-activities
#6
David G Streets, Hannah M Horowitz, Daniel J Jacob, Zifeng Lu, Leonard Levin, Arnout F H Ter Schure, Elsie M Sunderland
We estimate that a cumulative total of 1,540 (1,060-2,800) Gg (gigagrams, 109 grams or thousand tonnes) of mercury (Hg) have been released by human activities up to 2010, 73% of which was released after 1850. Of this liberated Hg, 470 Gg were emitted directly into the atmosphere, and 74% of the air emissions were elemental Hg. Cumulatively, about 1,070 Gg were released to land and water bodies. Though annual releases of Hg have been relatively stable since 1880 at 8 ± 2 Gg, except for wartime, the distributions of those releases among source types, world regions, and environmental media have changed dramatically...
April 27, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28448043/challenges-in-rheological-characterization-of-highly-concentrated-suspensions-a-case-study-for-screen-printing-silver-pastes
#7
Ceren Yüce, Norbert Willenbacher
A comprehensive rheological characterization of highly concentrated suspensions or pastes is mandatory for a targeted product development meeting the manifold requirements during processing and application of such complex fluids. In this investigation, measuring protocols for a conclusive assessment of different process relevant rheological parameters have been evaluated. This includes the determination of yield stress, viscosity, wall slip velocity, structural recovery after large deformation and elongation at break as well as tensile force during filament stretching...
April 10, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28447786/a-3d-mas-nmr-experiment-utilizing-through-space-15n-15n-correlations
#8
Kevin J Donovan, Robert Silvers, Sara Linse, Robert G Griffin
We demonstrate a novel 3D NNC magic angle spinning (MAS) NMR experiment that generates 15N- 15N internuclear contacts in protein systems using an optimized 15N- 15N proton assisted recoupling (PAR) mixing period and a 13C dimension for improved resolution. The optimized PAR condition permits the acquisition of high signal-to-noise 3D data that enables backbone chemical shift assignments using a strategy that is complementary to current schemes. The spectra can also provide distance constraints. The utility of the experiment is demonstrated on an M0Ab1-42 fibril sample that yields high-quality data that is readily assigned and interpreted...
April 27, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28447698/anisotropic-metal-nanoparticles-for-surface-enhanced-raman-scattering
#9
Javier Reguera, Judith Langer, Dorleta Jiménez de Aberasturi, Luis M Liz-Marzán
The optimization of the enhancement of Raman scattering by plasmonic effects is largely determined by the properties of the enhancing substrates. The main parameters behind this effect are related to the morphology of plasmonic nanoparticles and their relative distribution within the substrate. We focus this tutorial review on the effects of nanoparticle morphology, for the particular case of anisotropic metal nanoparticles. Anisotropy in silver and gold nanoparticles offers the possibility to tailor their plasmonic properties and intrinsic electromagnetic "hotspots"...
April 27, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28447446/highly-conductive-transparent-and-flexible-electrodes-including-double-stacked-thin-metal-films-for-transparent-flexible-electronics
#10
Jun Hee Han, Do-Hong Kim, Eun Gyo Jeong, Tae-Woo Lee, Myung Keun Lee, Jeong Woo Park, Hoseung Lee, Kyung Cheol Choi
In order to keep pace with the era of transparent and deformable electronics, the electrode functions should be improved. In this paper, an innovative structure is suggested to overcome the tradeoff between optical and electrical properties that commonly arises with transparent electrodes. The structure of double stacked metal films showed high conductivity (< 3 Ω/sq.) and high transparency (~90 %) simultaneously. A proper space between two metal films led to high transmittance by an optical phenomenon...
April 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28446781/inkjet-printing-of-high-performance-transistors-with-micron-order-chemically-set-gaps
#11
Peter Mack Grubb, Harish Subbaraman, Saungeun Park, Deji Akinwande, Ray T Chen
This paper reports a 100% inkjet printed transistor with a short channel of approximately 1 µm with an operating speed up to 18.21 GHz. Printed electronics are a burgeoning area in electronics development, but are often stymied by the large minimum feature size. To combat this, techniques were developed to allow for the printings of much shorter transistor channels. The small gap size is achieved through the use of silver inks with different chemical properties to prevent mixing. The combination of the short channel and semiconducting carbon nanotubes (CNT) allows for an exceptional experimentally measured on/off ratio of 10(6)...
April 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28446386/caffeine-citrate-is-it-a-silver-bullet-in-neonatology
#12
REVIEW
Bikash Shrestha, Gaurav Jawa
Caffeine citrate is one of the most prescribed drug in the present day NICU for apnea. Its efficacy, tolerability, wide therapeutic index and safety margin has made it the drug of choice among the methylxanthines. Its therapeutic uses in apnea of prematurity, mechanical ventilation, bronchopulmonary dysplasia has made it a "silver bullet" in neonatology. However, there are still controversies surrounding this drug. This review is aimed to update the reader about the basic pharmacology, current therapeutic uses, adverse effects, controversies as well as present and future research of caffeine...
March 27, 2017: Pediatrics and Neonatology
https://www.readbyqxmd.com/read/28446015/realistic-electric-field-mapping-of-anisotropic-muscle-during-electrical-stimulation-using-a-combination-of-water-diffusion-tensor-and-electrical-conductivity
#13
Bup Kyung Choi, Tong In Oh, Saurav Zk Sajib, Jin Woong Kim, Hyung Joong Kim, Oh In Kwon, Eung Je Woo
PURPOSE: To realistically map the electric fields of biological tissues using a diffusion tensor magnetic resonance electrical impedance tomography (DT-MREIT) method to estimate tissue response during electrical stimulation. METHODS: Imaging experiments were performed using chunks of bovine muscle. Two silver wire electrodes were positioned inside the muscle tissue for electrical stimulation. Electric pulses were applied with a 100-V amplitude and 100-μs width using a voltage stimulator...
April 2017: International Neurourology Journal
https://www.readbyqxmd.com/read/28445684/patient-staffing-and-health-centre-factors-associated-with-annual-testing-for-sexually-transmissible-infections-in-remote-primary-health-centres
#14
Belinda Hengel, Handan Wand, James Ward, Alice Rumbold, Linda Garton, Debbie Taylor-Thomson, Bronwyn Silver, Skye McGregor, Amalie Dyda, Jacqueline Mein, Janet Knox, Lisa Maher, John Kaldor, Rebecca Guy
Background: In high-incidence Chlamydia trachomatis (CT) and Neisseria gonorrhoeae (NG) settings, annual re-testing is an important public health strategy. Using baseline laboratory data (2009-10) from a cluster randomised trial in 67 remote Aboriginal communities, the extent of re-testing was determined, along with the associated patient, staffing and health centre factors. Methods: Annual testing was defined as re-testing in 9-15 months (guideline recommendation) and a broader time period of 5-15 months following an initial negative CT/NG test...
April 27, 2017: Sexual Health
https://www.readbyqxmd.com/read/28445644/broadband-fluorescence-enhancement-with-self-assembled-silver-nanoparticle-optical-antennas
#15
Carolin Vietz, Izabela Kaminska, Maria Sanz Paz, Philip Tinnefeld, Guillermo P Acuna
Plasmonic structures are known to affect the fluorescence properties of dyes placed in close proximity. This effect has been exploited in combination with single-molecule techniques for several applications in the field of biosensing. Among these plasmonic structures, top-down zero-mode waveguides stand out due to their broadband capabilities. In contrast, optical antennas based on gold nanostructures exhibit fluorescence enhancement on a narrow fraction of the visible spectrum typically restricted to the red to near-infrared region...
April 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28445394/spectroscopic-detection-of-glyphosate-in-water-assisted-by-laser-ablated-silver-nanoparticles
#16
Rafael Eleodoro De Góes, Marcia Muller, José Luís Fabris
Glyphosate is one of the most widely used herbicides in the world. Its safety for both human health and aquatic biomes is a subject of wide debate. There are limits to glyphosate's presence in bodies of water, and it is usually detected through complex analytical procedures. In this work, the presence of glyphosate is detected directly through optical interrogation of aqueous solution. For this purpose, silver nanoparticles were produced by pulsed laser ablation in liquids. Limits of detection of 0.9 mg/L and 3...
April 26, 2017: Sensors
https://www.readbyqxmd.com/read/28445163/annealing-of-au-ag-and-au-ag-alloy-nanoparticle-arrays-on-gaas-100-and-111-b
#17
Alexander M Whiticar, Erik K Mårtensson, Jesper Nygård, Kimberly A Dick, Jessica Bolinsson
Metal nanoparticles (NPs), in particular gold NPs, are often used in the fabrication process of semiconductor nanowires. Besides being able to induce the 1D crystallization of new material, it is highly beneficial if the NPs can be used to dictate the position and diameter of the final nanowire structure. To achieve well-defined NP arrays of varying diameter and pitch distances for nanowire growth, it is necessary to understand and control the effect that a pre-growth annealing process may have on the pre-defined NP arrays...
May 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28445036/ag-nanoparticles-and-wheat-roots-a-complex-interplay
#18
Ana Elena Pradas Del Real, Vladimir Vidal, Marie Carriere, Hiram A Castillo-Michel, Clément Levard, Perrine Chaurand, Géraldine Sarret
Agricultural soils are major sinks of silver nanoparticles in the environment, and crops are directly exposed to these emerging contaminants. A clear picture of their chemical transformations, uptake and transport mechanisms, and phytotoxic impacts is still lacking. In this work, wheat plants were exposed to pristine metallic (Ag-NPs) and sulfidized (Ag2S-NPs) silver nanoparticles and ionic Ag. Data on Ag distribution and speciation, phytotoxicity markers and gene expression were studied. A multi-technique and multi-scale approach was applied combining innovating tools at both laboratory and synchrotron...
April 26, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28445028/enhanced-electrocatalytic-activity-of-ethanol-oxidation-reaction-on-palladium-silver-nanoparticles-via-removable-surface-ligands
#19
Hucheng Zhang, Yingying Shang, Jing Zhao, Jianji Wang
This work developed a facile colloidal route to synthesize BH4--capped PdxAgy nanoparticles (NPs) in water using the reducing ionic liquids of [Cnmim]BH4, and the resulting NPs were prone to form the nanocomposites with [amim]+-modified reduced graphene (RG). The removal of the metal-free inorganic ions of BH4- can create the profoundly exposed interfaces on the PdxAgy NPs during the electrooxidation, and favor the ethanol oxidation reaction (EOR) in lowering energy barrier. The counterions of [Cnmim]+ can gather ethanol, OH- ions, and the reaction intermediates on catalysts, and synergistically interact with RG to facilitate the charge transfer in nanocomposites...
April 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28444846/forensic-analysis-of-latent-fingermarks-by-silver-assisted-ldi-imaging-ms-on-non-conductive-surfaces
#20
Nidia Lauzon, Martin Dufresne, Alexandre Beaudoin, Pierre Chaurand
Silver-assisted laser desorption ionization (AgLDI) imaging mass spectrometry (IMS) has been demonstrated to be a useful technology for fingermark analysis allowing for the detection of several classes of endogenous as well as exogenous compounds. Ideally, in IMS analyses, the fingermarks are deposited under controlled conditions on metallized conductive target slides. However, in forensic investigations, fingermarks are often found on a variety of non-conductive surfaces. A sputtered silver layer renders the target surface conductive, which allows the analyses of insulating surfaces by time-of-flight (TOF) IMS...
April 26, 2017: Journal of Mass Spectrometry: JMS
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