nitric oxide (NO) detection is of ..

Carbon based graphene oxide was synthesized by a modified Hummer’s method with different ratios of graphite to sodium nitrate (NaNO3) of 1:1, 1:2, and 2:1. These variations were carried out to determine which conditions would afford more oxygen functional groups. The products obtained, namely, GO1:1, GO1:2, GO2:1, were characterized by means of powder X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, elemental analysis, and Raman spectroscopy. XRD revealed that GO2:1 is more crystalline than either GO1:1 or GO1:2, while Raman spectroscopy confirmed the in-phase vibration (G-band) of GO2:1 at 1596 nm and the disorder band (D-band) at 1347 nm. Also, TEM showed the expected layer structure of the graphene oxide sheet. FTIR revealed the presence of oxygen functional groups while the elemental analysis confirmed that GO 2:1 has more oxygen functional groups than GO1:1 and GO1:2. Thus, the synthesis of GO with a limited amount of sodium nitrate provided a more crystalline and oxygen-functionalized material.

Receptor-mediated activation of nitric oxide synthesis …

The role of Nitric Oxide and Peroxynitrite in Chronic Fatigue Syndrome patients

inhibits nitric oxide synthesis

Zeolitic imidazolate frameworks (ZIFs), a subclass of metal-organic frameworks (MOFs), havebeen recently employed in various fields such as gas separation, catalysis, water purification anddrug delivery.1 Their high importance is due to their chemical and thermal stability in addition tothe flexibility of their design. ZIFs have been synthesized solvothermally or at room temperatureusing organic solvents (e.g. methanol, DMF) or pure water.2 The control of size and morphologyof crystals has been achieved using reverse microemulsion methods, microwave, ultrasoundassistedsyntheses and coordination modulation methods.1-3 Herein, we investigate a newsynthesis method where ZIF crystals are produced using the reaction-diffusion framework (RDF)in a gel medium at room temperature. The method is based on the diffusion of an outer solutionof the organic linker or mixed linkers into an agar gel containing the inner metal ions Zn(II)and/or Co(II) where a precipitation reaction takes place leading to the formation of the ZIFcrystals. A propagating supersaturation wave, initiated at the interface between the outer solutionand the gel matrix leads to a precipitation front endowed with a gradient of crystal sizes rangingbetween 100 nm and 55 μm along the same reaction tube. While the precipitation fronts of ZIF-8 and ZIF-67 travel the same distance for the same initial conditions, ZIF-8 crystals therein areconsistently smaller than the ZIF-67 crystals due to the disparity of their rate of nucleation andgrowth. The effects of temperature, the concentration of the reagents, and the thickness of thegel matrix on the growth of the ZIF crystals are investigated. We also show that by using RDF,we can envisage the formation mechanism of the ZIF crystals, which consists of the aggregationof ZIF nanospheres to form the ZIF-8 dodecahedrons. Moreover, using RDF the formation of asolid-solution ZIF via the incorporation of Co(II) and Zn(II) cations within the same frameworkis achieved in a controlled manner. Finally, we demonstrate that doping ZIF-8 by Co(II)enhances the photodegradation of methylene blue dye under visible light irradiation in theabsence of hydrogen peroxide.

An improved Hummers method for eco-friendly synthesis …

Heterogeneous photo-catalysis is an advanced oxidation process (PAO), which has been the subject of numerous studies and applications, particularly using the commercial oxide of TiO2 (P25, Evonik). Zinc oxide (ZnO) has often been considered a valid alternative to TiO2 due to its good opto-electronic, catalytic and photochemical characteristics along with its low cost. In order to improve the photocatalytic performance of ZnO for practical applications, various types of synthetic approaches have been developed, including, among others, the hydrothermal / solvothermal growth method, sol-gel method, ultrasonic assisted method, deposition chemistry in vapor phase, etc. with the aim of preparing ZnO particles with different sizes and morphologies. However, all of these methods require relatively severe reaction conditions such as high temperature, sophisticated techniques, high purity of gases, adjustable gas flow, expensive raw materials, etc. Therefore, it is important to find a simple and cost-effective method for the synthesis of crystalline nano-particles of ZnO. For this reason, in the present work, the ZnO has been synthesized by three different procedures: conventional aqueous precipitation method, hydrothermal method (H) and microwave assisted method (MW). In all three processes, the same material is obtained, hydrocincite [Zn5(CO3) 2(OH)6], which evolves to crystalline ZnO after calcination thermal treatments. We investigated the effect of the calcination temperature, at the same time (2 h), on the optical, textural and structural properties. Photo-catalytic studies were performed using two selected substrates, Methyl Orange and Phenol, as toxic model substrates (one colorant and the other transparent). The catalysts prepared were characterized by several techniques: DRX, SBET, FE-SEM, TEM and UV-Vis (in diffuse reflectance mode).From the results of XRD, it has been possible to establish that a minimum difference between the relative intensities of exposed faces (I100 and I002) is a crucial factor to obtain good photocatalytic properties. This minimum difference is achieved, in our cases by thermal treatments of calcination at 400ºC, 2 h. When this temperature is chosen, there is no appreciable variation between the photocatalytic activities of the oxides of zinc obtained by the three processes, and there are small differences depending on the nature of the substrate chosen, which can be attributed to the textural differences between the oxides. In any case, the obtained zinc oxides show, for each substrate, photo-catalytic activities in the UV that are superior to those presented by the widely used commercial oxide TiO2 (P25) used as reference.

Synthesis of neutral SiO 2 /TiO 2 hydrosol and its photocatalytic degradation of nitric oxide gas
Nitrosyl ruthenium complex as nitric oxide delivery agent: synthesis, ..


Self-protective/self-healing coatings are imperative for sustained corrosion protection and to minimise economic losses. The present research focuses on this premise. We report here the synthesis of a series of new effective organic corrosion inhibitors for corrosion protection of the aluminium alloy - AA2024-T3. The synthesized inhibitors were encapsulated in silica nano-containers and doped in GPTMS – Titanium isopropoxide based sol-gel coatings for “on-demand” release of the inhibitor. Anticorrosion behaviour of uncoated and coated coupons was characterized by Electrochemical impedance spectroscopy (EIS). The immersion time for evaluating the sustainability of the coatings in 3.5% NaCl was 168h as per MIL’s specifications. The localized corrosion and dissolution of the intermetallic particles (S & Ө phases) on the aluminium alloy was examined by using field emission scanning electron microscopy attached with energy dispersive X- ray spectroscopy, X-ray photoelectron spectroscopy and 3D profilometry. The acquired results revealed that, the synthesized inhibitors offered sustained corrosion protection to AA2024-T3. The coupons qualified salt spray test as per ASTM standard B117. The mechanism of action appeared to be formation organic thin layer of insoluble complex on the surface, thereby preventing the dislodgement of the inter-metallics and pitting corrosion characteristic of the AA2024-T3 alloy.

The rational design of nitric oxide selectivity in single-walled carbon nanotube near infrared ..

Program | 6th World Congress and Expo on …

CTAB (cetyltrimethylammonium bromide) coated manganese ferrite (MnFe2O4), nickel ferrite (NiFe2O4) and zinc ferrite (ZnFe2O4) nanoparticles with crystallite sizes of 23 nm, 15 nm, and 28 nm respectively were successfully synthesized by a facile co-precipitation method. The presence of CTAB on the surface of the nanoparticles was confirmed by the Transmission Electron Microscope (TEM) and Fourier Transform-Infrared spectrum (FT-IR). The magnetic study shows a high saturation magnetization of 46 emu/g (MnFe2O4), 59 emu/g (NiFe2O4) and 55 emu/g (ZnFe2O4) which indicates the Fe-O-Fe super-exchange interaction driven by the synergistic influence of magnetocrystalline anisotropy and cation distribution. The Field Cooling (FC) and Zero Field Cooling (ZFC) curves confirmed the superparamagnetic nature of all the samples. The induction heating study elucidates the efficiency of heat generation (>42°C) in all samples showing an exceptionally high specific absorption rate (SAR) of 480 Wg-1, 684 Wg-1, 586 Wg-1 at 2 mg/ml in which CTAB-NiFe2O4 nanoparticles shows the highest efficiency. This is attributed to the co-dependent factors: size, saturation magnetization and Neelian relaxation loss mechanism. This comparative study discussed on the collaborative influences of structural motifs and magnetic properties that engendered the effectiveness of heat generation making it viable for hyperthermia application.

Eugene Franklin, Emission spectrum of nitric oxide in the near infrared / ..

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Defense Advanced Research Projects AgencyDAS data-assimilation systemDAS data acquisition systemDAS direct access systemDASA Deutsche Aerospace Administration Department of the Arts, Sports, the Environment, Tourism, and Territories (formerly ) Department of the Arts, Sports, the Environment, Tourism, and Territories (now )DAT Department of Science and TechnologyDB direct-beam (irradiance)DB direct broadcastDBE Deep Basin Experimentdbh diameter at breast heightDBMS data base management systems (Deutsche Forschungs-und Versuchsanstalt fur Luft-und Raumfahrt (Germany)DBS Doppler beam swingingDC United States Department of CommerceDC developing countryDC Dairy cattle District of ColumbiaDCAR Danish Centre for Atmospheric ResearchDCDS Digital Cartographic Data StandardDCDSTF Digital Cartographic Data Standards Task Force (Composed of members of the and )DCF Discounted Cash FlowDCP data collection platformDCP-OES direct coupled plasma--optical emission spectroscopyDCS data collection systemDCT dedicated carbon taxDD degree dayDDF descriptive data fileDDL direct downlinkDDMP domain-decomposition-message-passingDDRP Direct/Delayed Response ProjectDDT dichlorodiphenyl-trichloroethane (insecticide)DE dynamics explorerDE DecayDE08 designation for an ice core drilled in 1977 at Law Dome, AntarcticaDEBITS Deposition of Biogeochemically Important Trace Species ()DEC Digital Equipment CorporationDECNet Digital Equipment Corporation NetworkDehydrite magnesium perchlorate anhydrous granulardE/dt rate of evaporation (moisture loss from soil)DEIS Draft Environmental Impact StatementDEM digital elevation model Department of Energy, Mines, and Resources (Canada)DEW distant early warningDGCM Dynamic Global Vegetation ModelDGLR Deutsche Gesellschaft fur Luft-und Raumfahrt (Germany)DGVM Dynamic Global Vegetation Model ()DH chromosome-doubled haploidDHCN Daily Historical Climate NetworkDHHS United States Department of Health and Human ServicesDHS Department of Human ServicesDI DirectorateDIA Denmark's Academy for EngineeringDIAL Differential Absorption LidarDIC dissolved inorganic carbonDICE Dynamic Integrated Climate EconomyDIDAC digital data acquisition systemDIF Data Interchange Format Data and Information Systems ( and )Discovery Research vessel ()DISORT discrete ordinate (model)DIS-SC Standing CommitteeDISSPLA Display Integrated Software System and Plotting LanguageDIU Data Information UnitDIW Department of Industrial WorksDKD Deutscher KalibrierdienstDLG digital line graphDLG-E digital line graph-enhancedDLR Deutsche Forschungsanstalt fur Luft-und Raumfahrt (Germany)DLS dynamic limb sounderDM Data Management ( and )DM deep monitoring (wells)DMA Defense Mapping Agency ()DMA direct memory access (computer term)DMDS dimethyl disulfideDM-MIMD distributed memory, multiple instruction, multiple data (computer)DMS data management systemDMS dimethyl sulfide or dimethylsulphideDMSO dimethyl sulfoxideDMSP Defense Meteorological Satellite Program () deoxyribonucleic acidDND Department of National Defense (Canada)DNES Department of Non-conventional Energy Sources (India) United States Department of AgricultureDOAI Department of Agriculture, IndonesiaDOAS differential optical absorption spectroscopyDOC dissolved organic carbon United States Department of Commerce United States Department of DefenseDOD Deutsches Ozeanographisches Datenzentrum (Germany)DOE Department of the Environment (Canada) United States Department of Energy United States Department of InteriorDOJ United States Department of JusticeDOL United States Department of LaborDOLY Dynamic Global Phytogeography Model ()DOM dissolved organic macromoleculesDOM dissolved organic matterDOMSAT Domestic Communications SatelliteDOMSTAR communications relay setDOPLID Doppler lidarDORIS Determination d'Orbite et Radio Positionement Integre par Satellite (France)DORIS Doppler Orbit and Radio Positioning Integration by SatelliteDOS Department of SpaceDOS United States Department of StateDOST Department of Science and Technology United States Department of TransportationDOY day of yearDP direct playbackDPC display code ()DPC Domestic Policy CouncilDPR development planning review(D)PR dual precipitation radarDPS Digital Photogrammetry SystemDQO Data Quality ObjectivesDRAW Direct Read After Write Animation SystemDRS Data Relay SatelliteDRSS Data Relay Satellite SystemDSB direct sounding broadcastDSDP deep sea drilling project Department of Scientific and Industrial Research (now ) ()DSIR Department of Scientific and Industrial Research, Institute of Nuclear Sciences (New Zealand)DSM demand-side managementDSN Deep Space NetworkDSP digital signal processingDSRT Deep Sea Reversing ThermometerDSS Data Support Section ()DST data system testsDST Department of Science and TechnologyDTD digital terrain dataDTH Technical University of DenmarkDTR Diurnal temperature rangeDU Dobson unitsDUNDEE Down Under Doppler and Electricity ExperimentDWBM Office of Defense Waste Byproducts 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