Gold-palladium alloys

Gold-palladium alloys, see Palladium-gold alloys... 

Fig. 6. Activation energy of carbon monoxide oxidation over nickel oxide on gold-palladium alloys (24). (Copyright by Akademische Verlags-Gessellschaft. Reprinted with permission.)...

A JEOL JSM 50A scanning electron microscope was used. Polymer surfaces were etched with a Hummer II sputtering device using argon ions and coated with a 20-nm thick sputtered film of gold/palladium alloy. 

Leap A process for making vinyl acetate monomer. It uses a fluidized bed of a new catalyst in powder form the reactants are acetic acid, ethylene, and oxygen. Developed by BP Amoco and first operated in Hull, England, in 2001. The catalyst is a supported gold-palladium alloy made by... 

Scanning Electron Microscopy fSEM). An IS1-40 SEM was used to take photomicrographs of cellulose fibers fractured in liquid nitrogen and coated with a gold-palladium alloy. 

The morphology was determined using a Quanta-200 3D scanning electron microscope (SEM) operated at an accelerating voltage of 1200 V. The sample (0.5 mg) was moimted onto a 5 x 5 mm silicon wafer affixed via graphite tape to an aluminum stub. The powder was then sputter-coated for 105 s at a beam current of 20 mA/dm with a 100-A layer of gold/palladium alloy. 

Sinfelt, J.H. Barnett, A.E. and Dembinski, G.W., inventors Exxon Research and Engineering Company, assignee. "Isomerization process utilizing a gold-palladium alloy in the catalyst." U.S. Patent 3,442,973. 2 pages. May 6,1969. 

Deva. [Degussa] Gold/palladium alloy for dratal applic. 

The so-called white gold alloys were introduced to resemble platinum when that metal was prohibitive in price, and their use in jewellery has been very successful. The earliest white gold contained. gold, nickel and zinc. Gold-palladium alloys are easier to work and with 20 per cent of the latter element are completely white, but the high price of palladium militates against their use except in the most expensive jewellery. Green, blue and purple alloys are also easily made by addition of cadmium, iron and aluminium respectively. 

After 5 minutes of reaction time in each case, the solution was centrifuged and washed with DI water three times. A few drops of washed solutions were placed on sample holders in each case and left to dry under ambient conditions. The dried sanq>les were either coated by evaporation of gold-palladium alloy or sputter coated with gold and they were further characterised by Field Emission-Scanning Electron Microscope (FE-SEM) for product morphology, which was also equipped with an Energy Dispersive Spectroscopy (EDS) facility for elemental analysis. In the control experiments without using the protein, no silica precipitation was observed even over a 24 hour period, as was described previously [13]. 

A principal advantage of SEM is the ease of sample preparation. In most instances, it is sufficient to coat the sample with only a thin (20 nm) layer of gold/palladium alloy to minimize charging. Platinum, carbon, and gold are also used to coat samples, but gold can puddle on some surfaces leading to the appearance of artifacts in the photomicrographs. 

C.J., and Hutchings, G.J. (2013) Oxidation of methane to methanol with hydrogen peroxide using supported Gold-Palladium alloy nanoparticles, zbigew. Chem. Int. Ed., 52,1280 1284. 

Dimitratos, N., Lopez-Sanchez, J., Anthonykutty, J., et al. (2009). Oxidation of Glycerol Using Gold-Palladium Alloy-Supported Nanocrystals, Phys. Chem. Chem. Phys., 11, pp. 4952-A961. 

Hutchings, G.J. (2008) Nanocrystalline gold and gold palladium alloy catalysts for chemical synthesis. Chemical Communications, (10), 1148-1164. 

The thin layer of conductive material, usually gold, gold-palladium alloy, or even amorphous carbon, is generally deposited by sputter coaters. Biological samples can absorb moisture from the environment and they need to be carefully stored in order to avoid adsorbed water molecules in the material. If present, these molecules will vaporize in a vacuum chamber, creating obstacles for the electron beams and obscuring the clarity of the image (Amelinckx et al., 2008 Hunter et al., 1993). 

Electrodeposition of Gold-Palladium Alloys, P. Stevens, U.S. Patent 4,048,023 (1977). 

Gold-Palladium Alloys in Spark Plug Electrodes... 

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