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https://www.readbyqxmd.com/read/28532043/microarc-oxidation-discharge-types-and-bio-properties-of-the-coating-synthesized-on-zirconium
#1
Sezgin Cengiz, Yunus Azakli, Mehmet Tarakci, Lia Stanciu, Yucel Gencer
This study is an attempt for gaining a better understanding on relationship between microarc oxidation (MAO) coating discharge types and bioactivity of an oxide-based coating synthesized on a Zr substrate. The discharge types and the coating growth mechanism were identified by the examination of the real cross-section image of the coating microstructure. The coating was conducted by using MAO in an electrolyte containing Na2SiO3, Ca(CH3COO)2 and C3H7Na2O6P, for different durations of 2.5, 5, 15, and 30mins...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532001/apatite-grown-in-niobium-by-two-step-plasma-electrolytic-oxidation
#2
Bruno Leandro Pereira, Carlos Maurício Lepienski, Irineu Mazzaro, Neide Kazue Kuromoto
Plasma electrolytic oxidation (PEO) of niobium plates were done electrochemically in two steps with electrolytes containing phosphorous and calcium being observed the formation of crystalline apatite. All samples were submitted to a first step of PEO using an electrolyte containing phosphate ions. The second oxidization step was made using three different electrolytes. Some samples were oxidized by PEO in electrolyte containing calcium, while in other samples it was used two mixtures of phosphoric acid and calcium acetate monohydrate solutions...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531643/lipid-based-nutrient-supplements-containing-vitamins-and-minerals-attenuate-renal-electrolyte-loss-in-hiv-aids-patients-starting-antiretroviral-therapy-a-randomized-controlled-trial-in-zambia
#3
D Munkombwe, T L Muungo, C Michelo, P Kelly, S Chirwa, S Filteau
BACKGROUND & AIMS: Advanced HIV infection combined with undernutrition and antiretroviral therapy (ART) places HIV/AIDS patients at high risk of electrolyte abnormalities and increased morbidity and mortality. Here, in a sub-study of a large published randomized trial, we evaluated if nutritional supplements will help curtail renal electrolyte loss in HIV/AIDS patients starting ART. METHODS: 130 malnourished HIV-positive patients referred for ART received lipid-based nutrient supplements alone (LNS, n = 63) or together with vitamins and minerals (LNS-VM, n = 67)...
June 2016: Clinical Nutrition ESPEN
https://www.readbyqxmd.com/read/28531577/the-effect-of-isotonic-drinks-on-electrolyte-abnormalities-of-ileostomy-patients-preliminary-results
#4
Antigoni Chalkia, Athanasios Migdanis, Georgios Koukoulis, Ioannis Mamaloudis, Ioannis Migdanis, Eleni Malisiova, Ioannis Gioulbasanis, Georgios Tzovaras
No abstract text is available yet for this article.
June 2016: Clinical Nutrition ESPEN
https://www.readbyqxmd.com/read/28530829/highly-oriented-atomically-thin-ambipolar-mose2-grown-by-molecular-beam-epitaxy
#5
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/28530820/behavior-of-germanium-and-silicon-nanowire-anodes-with-ionic-liquid-electrolytes
#6
Guk-Tae Kim, Tadhg Kennedy, Michael Brandon, Hugh Geaney, Kevin M Ryan, Stefano Passerini, Giovanni Battista Appetecchi
The electrochemical behavior of binder-free, germanium and silicon nanowires as high capacity anode materials for lithium-ion battery systems are investigated in an ionic liquid electrolyte. Cyclic voltammetry, cycling tests and impedance spectroscopy reveal a highly reversible lithium alloying / de-alloying process, as well as promising compatibility between the Ge and Si materials and the electrolyte components. Reversible capacities of 1,400 and 2,200 mA h g-1 are delivered by the Ge and Si anodes, respectively, matching the values exhibited in conventional organic solutions...
May 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28530818/metal-foam-based-ultrafast-electronucleation-of-hydrates-at-low-voltages
#7
Arjang Shahriari, Palash Vadiraj Acharya, Katherine Carpenter, Vaibhav Bahadur
The induction time for the nucleation of hydrates can be significantly reduced by electronucleation, which consists of applying an electrical potential across the hydrate precursor solution. This study reveals that open-cell aluminum foam electrodes can reduce the electronucleation induction time by 150X, when compared to non-foam electrodes. Experiments with tetrahydrofuran hydrates show that aluminum foam electrodes trigger near-instantaneous nucleation (in only 10's of seconds) at low voltages. Furthermore, this study suggests that two distinct interfacial mechanisms influence electronucleation, namely electrolytic bubble generation, and the formation of metal ion complex-based coordination compounds...
May 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28530798/heterogeneous-molecular-catalysis-of-electrochemical-reactions-volcano-plots-and-catalytic-tafel-plots
#8
Cyrille Costentin, Jean-Michel Savéant
We analyze here, in the framework of heterogeneous mo-lecular catalysis the reasons of occurrence or non-occurrence of volcanoes upon plotting the kinetics of the catalytic reaction versus the stabilization free energy of the primary intermediate of the catalytic process. As in the case of homogeneous molecular catalysis or catalysis by surface active metallic sites, a strong motivation of such studies relates to modern energy challenges, particularly those involving small molecules such as water, hydrogen, oxygen, proton and carbon dioxide...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28530796/what-do-laser-induced-transient-techniques-reveal-for-batteries-na-and-k-intercalation-from-aqueous-electrolytes-as-an-example
#9
Daniel Scieszka, Jeongsik Yun, Aliaksandr S Bandarenka
Technological advancement has been revolutionized by rechargeable batteries, without which the use of various modern devices would not be possible. Aqueous Na-ion batteries have lately garnered much attention, being rec-ognized as a promising alternative to the commonly used Li-ion batteries for the large-scale energy storage systems. However, further improvement and optimization of such systems require a more detailed understanding of intercalation mechanisms. In this work, we for the first time demonstrate implementation of the laser induced current transient (LICT) technique for in-situ characterization of battery systems and investigate the interface between Na2Ni[Fe(CN)6] model battery electrodes in contact with aqueous electrolytes...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28530305/ultrathin-coox-modified-hematite-with-low-onset-potential-for-solar-water-oxidation
#10
Chun Du, Jun Wang, Xiao Liu, Jie Yang, Kun Cao, Yanwei Wen, Rong Chen, Bin Shan
Photoelectrochemical water splitting holds great potential for solar energy conversion and storage with zero greenhouse gas emission. Integration of a suitable co-catalyst with an absorber material enables the realization of highly efficient photocleavage of water. Herein, nanostructured hematite film was coated with an ultrathin and conformal CoOx overlayer through atomic layer deposition (ALD). The best performing hybrid hematite with a 2-3 nm ALD CoOx overlayer yielded a remarkable turn on potential of 0...
May 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28530294/electrochemical-nanoimprint-lithography-when-nanoimprint-lithography-meets-metal-assisted-chemical-etching
#11
Jie Zhang, Lin Zhang, Lianhuan Han, Zhao-Wu Tian, Zhong-Qun Tian, Dongping Zhan
The functional three dimensional micro-nanostructures (3D-MNS) play crucial roles in integrated and miniaturized systems because of the excellent physical, mechanical, electric and optical properties. Nanoimprint lithography (NIL) has been versatile in the fabrication of 3D-MNS by pressing thermoplastic and photocuring resists into the imprint mold. However, direct nanoimprint on the semiconductor wafer still remains a great challenge. On the other hand, considered as a competitive fabrication method for erect high-aspect 3D-MNS, metal assisted chemical etching (MacEtch) can remove the semiconductor by spontaneous corrosion reaction at the metal/semiconductor/electrolyte 3-phase interface...
May 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28528550/isotachophoretic-fluorescence-in-situ-hybridization-of-intact-bacterial-cells
#12
Sui Ching Phung, Joan Marc Cabot, Mirek Macka, Shane M Powell, Rosanne M Guijt, Michael C Breadmore
A counter-pressure assisted capillary isotachophoresis method in combination with a sieving matrix and ionic spacer was used to perform in-line fluorescence in situ hybridization (FISH) of bacterial cells. A high concentration of sieving matrix (1.8% w/v HEC) was introduced at one end of the capillary and the bacterial cells were suspended in the spacer electrolyte for injection. Using a 2 min injection with 18 psi counter-pressure, 50% of the cells injected into the capillary were hybridized with the fluorescently labelled oligonucleotide and the excess unhybridized probe was separated from the hybridized cells-probe complexes in a two stage ITP method...
May 22, 2017: Analytical Chemistry
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
#13
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/28527981/an-identification-of-the-soft-polyelectrolyte-gel-like-layer-on-silica-colloids-using-atomic-force-and-electron-microscopy
#14
Jiří Škvarla, Juraj Škvarla
A procedure is introduced for measuring the radius of spherical colloid particles from the curvature of upper parts of their central cross-sectional profiles obtained by atomic force microscopy (AFM). To minimize the possible compression and displacement of the spheres, AFM is operated in a mode rendering a constant ultralow pN force on the tip. The procedure allows us to evaluate the mean radius of nearly monodisperse submicrometer spheres of silica in their natively hydrated state in aqueous electrolyte solutions, irrespective of whether they are coagulated or not...
May 16, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28527586/gastrointestinal-bowel-obstruction-in-acute-ischemic-stroke-incidence-risk-factors-and-outcomes-in-a-u-s-nationwide-analysis-of-3-998-667-hospitalizations
#15
Kavelin Rumalla, Ashwath S Kumar, Manoj K Mittal
OBJECTIVE: The prognosis from acute ischemic stroke (AIS) is worsened by poststroke medical complications. The incidence, risk factors, and outcomes of gastrointestinal bowel obstruction (GIBO) in AIS are not known. METHODS: We queried the Nationwide Inpatient Sample (2002-2011) to identify all patients with a primary diagnosis of AIS and subsets with and without a secondary diagnosis of GIBO without hernia. Multivariable analysis was utilized to identify risk factors for GIBO in AIS patients and the association between GIBO, in-hospital complications, and outcomes...
May 17, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28527511/accumulation-of-biomass-and-four-triterpenoids-in-two-stage-cultured-poria-cocos-mycelia-and-diuretic-activity-in-rats
#16
Gao-Sheng Hu, Chong-Gui Huang, Yang Zhang, Wei Xiao, Jing-Ming Jia
Poria cocos (Schw.) Wolf, an important medicinal and food fungus, is well known in East Asia. Due to growing market demand, long cultivation period, and consumption of pine trunk during cultivation, developing alternative methods for producing P. cocos and/or its active components is of interest. In the present study, the effects of different culture methods on biomass and accumulation of four triterpenoids were investigated. The ethanol extract of fermented mycelium (EFM) was orally administered to rats. Urine output and concentrations of electrolytes (Na(+), K(+), and Cl(-)) were measured...
April 2017: Chinese Journal of Natural Medicines
https://www.readbyqxmd.com/read/28527469/molecular-adsorption-at-electrolyte-%C3%AE-al2o3-interface-of-aluminum-electrolytic-capacitor-revealed-by-sum-frequency-vibrational-spectroscopy
#17
Ming Jia, Xiaoyu Hu, Jin Liu, Yexiang Liu, Liang Ai
The operating voltage of an aluminum electrolytic capacitor is determined by the breakdown voltage (Ub) of the Al2O3 anode. Ub is related to the molecular adsorption at the Al2O3/electrolyte interface. Therefore, we have employed sum-frequency vibrational spectroscopy (SFVS) to study the adsorption states of a simple electrolyte, ethylene glycol (EG) solution with ammonium adipate, on an α-Al2O3 surface. In an acidic electrolyte (pH < 6), the Al2O3 surface is positively charged. The observed SFVS spectra show that long chain molecules poly ethylene glycol and ethylene glycol adipate adopt a "lying" orientation at the interface...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28527458/conformation-change-of-an-isotactic-poly-n-isopropylacrylamide-membrane-molecular-dynamics
#18
Irene Adroher-Benítez, Arturo Moncho-Jordá, Gerardo Odriozola
In this work, isotactic Poly (N-Isopropylacrylamide)-PNIPAM-in neat water and in electrolyte solutions is studied by means of molecular dynamics simulations. This is done for an infinitely diluted oligomer and for an assembly of several PNIPAM chains arranged into a planar membrane configuration with a core-shell morphology. We employed two different force fields, AMBER (assisted model building with energy refinement) and OPLS-AA (all atom - optimized potentials for liquid simulations) in combination with extended simple point charge water...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28527430/bjerrum-pairs-in-ionic-solutions-a-poisson-boltzmann-approach
#19
Ram M Adar, Tomer Markovich, David Andelman
Ionic solutions are often regarded as fully dissociated ions dispersed in a polar solvent. While this picture holds for dilute solutions, at higher ionic concentrations, oppositely charged ions can associate into dimers, referred to as Bjerrum pairs. We consider the formation of such pairs within the nonlinear Poisson-Boltzmann framework and investigate their effects on bulk and interfacial properties of electrolytes. Our findings show that pairs can reduce the magnitude of the dielectric decrement of ionic solutions as the ionic concentration increases...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28527248/-clinical-and-demographic-profile-and-risk-factors-for-clostridium-difficile-infection
#20
Carlos Carvajal, Carlos Pacheco, Fabián Jaimes
INTRODUCTION: Clostridium difficile infection is the leading cause of nosocomial infectious diarrhea. The increasing incidence added to a lower rate of response to the initial treatment and higher rates of relapse has generated a higher burden of the disease. OBJECTIVE: To determine the clinical characteristics of hospitalized patients with C. difficile infection. MATERIALS AND METHODS: We made a nested case-cohort study. We reviewed medical records of the patients with nosocomial diarrhea for whom an assay for toxin A-B of C...
January 24, 2017: Biomédica: Revista del Instituto Nacional de Salud
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