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Metals Deposition

Local deposition is interesting in technology, and several studies show that this can be performed with in-situ scanning probe microscopes. On graphite Li et al. [Pg.53]


At potentials positive to the bulk metal deposition, a metal monolayer-or in some cases a bilayer-of one metal can be electrodeposited on another metal surface this phenomenon is referred to as underiDotential deposition (upd) in the literature. Many investigations of several different metal adsorbate/substrate systems have been published to date. In general, two different classes of surface stmetures can be classified (a) simple superstmetures with small packing densities and (b) close-packed (bulklike) or even compressed stmetures, which are observed for deposition of the heavy metal ions Tl, Hg and Pb on Ag, Au, Cu or Pt (see, e.g., [63, 64, 65, 66, 62, 68, 69 and 70]). In case (a), the metal adsorbate is very often stabilized by coadsorbed anions typical representatives of this type are Cu/Au (111) (e.g. [44, 45, 21, 22 and 25]) or Cu/Pt(l 11) (e.g. [46, 74, 75, and 26 ]) It has to be mentioned that the two dimensional ordering of the Cu adatoms is significantly affected by the presence of coadsorbed anions, for example, for the upd of Cu on Au(l 11), the onset of underiDotential deposition shifts to more positive potentials from 80"to Br and CE [72]. [Pg.2753]

The aqueous solution has a low conductivity, indicating that mercury(II) chloride dissolves essentially as molecules Cl—Hg—Cl and these linear molecules are found in the solid and vapour. A solution of mercury(II) chloride is readily reduced, for example by tin(ll) chloride, to give first white insoluble mercury(I) chloride and then a black metallic deposit of mercury, The complexes formed from mercury(II) chloride are considered below. [Pg.438]

The catalyst is also employed in the form of the finely-divided metal deposited upon activated carbon (usually containing 5 or 10 per cent. Pd) two methods of preparation are described, in one reduction is effected with alkaline formaldehyde solution and in the other with hydrogen ... [Pg.949]

Europium is now prepared by mixing EU2O3 with a 10%-excess of lanthanum metal and heating the mixture in a tantalum crucible under high vacuum. The element is collected as a silvery-white metallic deposit on the walls of the crucible. [Pg.177]

Indium chemicals and electroplated metal deposits ate replacing mercury (qv) in the manufacture of alkaline batteries (qv). Indium, like mercury, functions to reduce outgassing within the battery and promotes the uniform corrosion of the anode and cathode while the battery is under electrical load. Indium inorganic chemicals also find use as catalysts in various chemical processes. [Pg.81]

Fused Salt Electrolysis. Only light RE metals (La to Nd) can be produced by molten salt electrolysis because these have a relatively low melting point compared to those of medium and heavy RE metals. Deposition of an alloy with another metal, Zn for example, is an alternative. The feed is a mixture of anhydrous RE chlorides and fluorides. The materials from which the electrolysis cell is constmcted are of great importance because of the high reactivity of the rare-earth metals. Molybdenum, tungsten, tantalum, or alternatively iron with ceramic or graphite linings are used as cmcible materials. Carbon is frequently used as an anode material. [Pg.546]

A typical example might involve use of a krypton fluoride excimer laser operating at 249 nm with a pulse duration around 100 nanoseconds and a pulse repetition rate which can be varied up to 200 Hz. For metal deposition, energy densities in the range from 0.1 to 1 J/cm per pulse are typical. [Pg.19]

The concentration of most metals in the earth s cmst is very low, and even for abundant elements such as aluminum and iron, extraction from common rock is not economically feasible. An ore is a metallic deposit from which the metal can be economically extracted. The amount of valuable metal in the ore is the tenor, or ore grade, usually given as the wt % of metal or oxide. Eor precious metals, the tenor is given in grams per metric ton or troy ounces per avoirdupois short ton (2000 pounds). The tenor and the type of metallic compounds are the main characteristics of an ore. The economic feasibihty of ore processing, however, depends also on the nature, location, and size of the deposit the availabihty and cost of a suitable extraction process and the market price of the metal. [Pg.162]

The most common Schottky contacts for compound semiconductors are gold-based metallizations deposited by thermal or electron beam evaporation. The metal may include a thin titanium layer in direct contact with the semiconductor which acts as an adhesion layer. AdditionaHy, a thin layer... [Pg.383]

Sulfamic acid and its salts retard the precipitation of barium sulfate and prevent precipitation of silver and mercury salts by alkah. It has been suggested that salts of the type AgNHSO K [15293-60 ] form with elemental metals or salts of mercury, gold, and silver (19). Upon heating such solutions, the metal deposits slowly ia mirror form on the wall of a glass container. Studies of chemical and electrochemical behavior of various metals ia sulfamic acid solutions are described ia Reference 20. [Pg.62]

Production and Economic Aspects. Thallium is obtained commercially as a by-product in the roasting of zinc, copper, and lead ores. The thallium is collected in the flue dust in the form of oxide or sulfate with other by-product metals, eg, cadmium, indium, germanium, selenium, and tellurium. The thallium content of the flue dust is low and further enrichment steps are required. If the thallium compounds present are soluble, ie, as oxides or sulfates, direct leaching with water or dilute acid separates them from the other insoluble metals. Otherwise, the thallium compound is solubilized with oxidizing roasts, by sulfatization, or by treatment with alkaU. The thallium precipitates from these solutions as thaUium(I) chloride [7791 -12-0]. Electrolysis of the thaUium(I) sulfate [7446-18-6] solution affords thallium metal in high purity (5,6). The sulfate solution must be acidified with sulfuric acid to avoid cathodic separation of zinc and anodic deposition of thaUium(III) oxide [1314-32-5]. The metal deposited on the cathode is removed, kneaded into lumps, and dried. It is then compressed into blocks, melted under hydrogen, and cast into sticks. [Pg.467]

Easily decomposed, volatile metal carbonyls have been used in metal deposition reactions where heating forms the metal and carbon monoxide. Other products such as metal carbides and carbon may also form, depending on the conditions. The commercially important Mond process depends on the thermal decomposition of Ni(CO)4 to form high purity nickel. In a typical vapor deposition process, a purified inert carrier gas is passed over a metal carbonyl containing the metal to be deposited. The carbonyl is volatilized, with or without heat, and carried over a heated substrate. The carbonyl is decomposed and the metal deposited on the substrate. A number of papers have appeared concerning vapor deposition techniques and uses (170—179). [Pg.70]

In the presence of metallic copper, metallic silver, or a copper-silver alloy used in the form of gauze or as metal deposited on a low surface area inert support, methanol can be dehydrogenated to formaldehyde at 400—500°C. [Pg.198]

Plating T anks. An electroless plating line consists of a series of lead-lined (for plastics etching) or plastic-lined tanks equipped with filters and heaters, separated by rinse tanks (24). Most metal tanks, except for passivated stainless steel used for electroless nickel, cannot be used to hold electroless plating baths because the metal initiates electroless plating onto itself. Tank linings must be stripped of metal deposits using acid at periodic intervals. [Pg.107]

Cathode Efficiency. Faraday s law relates the passage of current to the amount of a particular metal being deposited ie, 96,485 coulombs, equal to one Faraday, deposits one gram-equivalent weight of a metal at 100% efficiency. The cathode efficiency, an important factor in commercial electroplating, is the ratio of the actual amount of metal deposited to that theoretically calculated multipHed by 100%. [Pg.145]

Reference 38 is a good guide to the selection of plate thickness test methods. Test methods may vary with the purity and electrochemical activity of the deposit. Metals deposited from commercial plating solutions are seldom pure. For example, zinc deposits from the three commonly used baths, ie, cyanide, chloride, and zincate, vary significantly in purity and activity (39). Standard ASTM test methods for determining plate thickness are... [Pg.151]

Ductility Tests. The ductihty of plated metals differs considerably from the corresponding thermally cast metals. Additionally, ductihty which is an important property if parts are to be deformed after plating, varies with the chemical composition of the plating solution, as well as the operating conditions of a given plating process. Ductihty can also be important when plated parts are stressed in use. Some metal deposits have coefficients of... [Pg.151]

AU other carbon steel, low-intermediate, and high-aUoy steels, ferritic steels Base metal Deposited weld metal and heat-affected zone (See Note 1) 2. Except when conchtions conform to Note 2, the material shall be heat-treated to control its microstructure by a method appropriate to the material as outlined in the specification applicable to the product form and then impact-tested. (See Note 1.) Deposited weld metal and heat-affected zone shall be impact-tested. [Pg.1006]

Eitch indented into the tube. Tube 48 was a clean copper tube that ad 50 longitudinal flutes pressed into the wall (Gener Electric double-flute profile, Diedrich, U.S. Patent 3,244,601, Apr. 5, 1966). Tubes 47 and 39 had a specially patterned porous sintered-metal deposit on the boihng side to promote nucleate boiling (Minton, U.S. [Pg.1046]

Metal depositors. Metal-depositing bacteria oxidize ferrous iron (Fe ) to ferric iron (Fe ). Ferric hydroxide is the result. Some bacteria oxidize manganese and other metals. Gallionella bacteria, in particular, have been associated with the accumulation of iron oxides in tubercles. In fact, up to 90% of the dry weight of the cell mass can be iron hydroxide. These bacteria appear filamentous. The oxide accumulates along very fine tails or excretion stalks generated by these organisms. [Pg.122]

Some metal carbonyls, such as nickel, cobalt and manganese compounds have been used to produce metallic deposition. The decomposition occurs in a stepwise manner, producing one CO(g) molecule at each step. [Pg.71]

A number of attempts to produce tire refractory metals, such as titanium and zirconium, by molten chloride electrolysis have not met widr success with two exceptions. The electrolysis of caesium salts such as Cs2ZrCl6 and CsTaCle, and of the fluorides Na2ZrF6 and NaTaFg have produced satisfactoty products on the laboratory scale (Flengas and Pint, 1969) but other systems have produced merely metallic dusts aird dendritic deposits. These observations suggest tlrat, as in tire case of metal deposition from aqueous electrolytes, e.g. Ag from Ag(CN)/ instead of from AgNOj, tire formation of stable metal complexes in tire liquid electrolyte is the key to success. [Pg.349]

Metal deposition onto polymers microfibrous metal surfaces... [Pg.334]

An alternate form of catalyst is pellets. The pellets are available in various diameters or extruded forms. The pellets can have an aluminum oxide coating with a noble metal deposited as the catalyst. The beads are placed in a tray or bed and have a depth of anywhere from 6 to 10 inches. The larger the bead (1/4 inch versus 1/8 inch) the less the pressure drop through the catalyst bed. However, the larger the bead, the less surface area is present in the same volume which translates to less destruction efficiency. Higher pressure drop translates into higher horsepower required for the oxidation system. The noble metal monoliths have a relatively low pressure drop and are typically more expensive than the pellets for the same application. [Pg.480]

Composite Plate—an electrodeposit that consists of two or more layers of metals deposited separately. [Pg.47]

The isolation of zinc, over 90% of which is from sulfide ores, depends on conventional physical concentration of the ore by sedimentation or flotation techniques. This is followed by roasting to produce the oxides the SO2 which is generated is used to produce sulfuric acid. The ZnO is then either treated electrolytically or smelted with coke. In the former case the zinc is leached from the crude ZnO with dil H2SO4, at which point cadmium is precipitated by the addition of zinc dust. The ZnS04 solution is then electrolysed and the metal deposited — in a state of 99.95% purity — on to aluminium cathodes. [Pg.1202]


See other pages where Metals Deposition is mentioned: [Pg.376]    [Pg.1686]    [Pg.1703]    [Pg.1948]    [Pg.2751]    [Pg.408]    [Pg.207]    [Pg.344]    [Pg.348]    [Pg.133]    [Pg.134]    [Pg.134]    [Pg.136]    [Pg.391]    [Pg.383]    [Pg.383]    [Pg.383]    [Pg.527]    [Pg.392]    [Pg.486]    [Pg.31]    [Pg.28]    [Pg.31]    [Pg.447]   
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Acid deposition influence on the biogeochemical migration of heavy metals in food webs

Ag metal deposition

Alkali metal deposition

Alkaline earth metal oxides deposition

Alkaline earth metals, deposition

Aluminum deposition metal substrates

Aluminum metal electrode, deposition

Atmospheric pressure metal organic chemical vapor deposition

Atomic Layer Deposition of Metal oxides

Atomic layer deposition metal oxides

Atomic layer deposition metals

Barrier metal , electroless deposition

Bulk-Metal Deposition

CONTENTS Electroless Metal Deposition

Calcination metal deposition

Calcium metal electrode, deposition

Carbon materials metal deposits

Catalysis metal deposition

Catalyst aged, metal deposition profiles

Catalyst synthesis metal depositions

Cathodic Metal Deposition

Cathodic deposition of metals

Charge transfer metal deposition

Chehelkureh ore deposit, Iran implications for evolution of base-metal mineralization

Chemical Deposition of Metals and Alloys from Aqueous Solutions

Chemical vapor deposition , metallation

Chemical vapor deposition metal organic, preparation

Chemical vapor deposition metal oxide film precursors

Chemical vapor deposition metal-organic compound

Chemical vapour deposition metal films

Cleaning metal deposits

Colloidal metals, deposition/immobilization

Compact metal deposit

Comparison metal deposition techniques

Continuity approach, metal deposition

Corrosion product deposition, liquid metals

Coverage metal deposit

Crystal platinum metals, underpotential deposition

Current during pure metal deposition

Cyclic voltammetry metal deposition

Decomposition Assisted by a Pre-deposited Metal

Dense metallic membranes chemical vapor deposition

Deposited Metals, DOI

Deposited metal, hydrogen content

Deposition electrochemical metal

Deposition metal film

Deposition metal-containing polymer films

Deposition of metal atoms

Deposition of metals

Deposition trace metals

Deposition-precipitation synthesis, supported metal catalysts

Deposits metal sulfide

Diamond metal deposition

Disperse metal deposits

Displacement deposition complexed metal ions

Early Stages of Metal Deposition on a Foreign Substrate

Electrocatalytic Activity of Semiconductor Electrodes Modified by Surface-Deposited Metal Nanophase

Electrochemical crystal metal deposition

Electrochemical deposition of metals

Electrochemical metal deposition bimetallic surfaces

Electrochemical reaction metal deposition

Electrochemical synthesis metallic nanoparticle deposition

Electrodeposition metal deposition fundamentals

Electrodes metal deposition

Electroless Metal Deposition Using Anodic Alumina as a Template

Electroless deposition metals

Electroless deposition of metals

Electroless plating, metal deposition

Electron-beam evaporation, metal deposition onto

Electroplating, metal deposition

Element Tracing in Environmental Science and Exploration of Metal Deposits

Energy disperse spectroscopy , metal deposition

Epithermal base-metal deposits

Epithermal precious-metal deposits

Exploiting Surface Chemistry to Prepare Metal-Supported Catalysts by Organometallic Chemical Vapor Deposition

Film Deposition Using Metal-Organic Precursors

Flat band potential metal deposit

Gate metal deposition

General Factors Affecting the Behavior of Metals Deposited onto Self-Assembled Monolayers

Germanium metal deposition

Gold metal electrode, deposition

Heavy metals, atmospheric deposition

Heteroepitaxial metal deposition

Homoepitaxial metal deposition

Host Metal Deposition on the Supports

Hydrogen reduction metal deposition

Hydrogenation catalysts metals deposition

Hydrotreating catalysts metals deposition

Impregnation, metal deposition

Inhibition metal deposition

Ionic liquids metal deposition from

Iron-group metals, deposition

Laser Metal Deposition Additive Manufacturing

Laser-directed metal deposition

Laser-induced metal deposition

Light-Induced Metal Deposition

Lithium metal deposition

Local metal deposition

Local metal deposition defect induced

Metal , underpotential deposition

Metal Deposition Electrochemistry of MOFs

Metal Deposition is an Unexpectedly Fast Reaction

Metal Deposition on MgO

Metal Deposition on SAM-Modified Electrodes

Metal Deposition on Solid Electrodes

Metal Nanocluster Deposition via Jump-to-Contact

Metal Oxide Chemical Vapor Deposition

Metal Oxide Chemical Vapor Deposition MOCVD) method

Metal atmospheric deposition

Metal borides deposition

Metal catalyzed chemical vapor deposition

Metal clusters, deposition

Metal deposit

Metal deposition Raman spectroscopy

Metal deposition and

Metal deposition and dissolution

Metal deposition and etching

Metal deposition colloidal matter

Metal deposition current density

Metal deposition depolarization

Metal deposition displacement

Metal deposition early stages

Metal deposition electrochemical crystal microbalance

Metal deposition electrodeposition

Metal deposition ellipsometry

Metal deposition factors affecting

Metal deposition foreign substrate

Metal deposition mechanism

Metal deposition on catalysts

Metal deposition optical spectroscopy

Metal deposition overvoltage

Metal deposition parallel reactions

Metal deposition process

Metal deposition rate

Metal deposition reduction

Metal deposition reflection spectroscopy

Metal deposition temperature

Metal deposition under ultrahigh vacuum

Metal deposition, electrode surface

Metal deposits catalyst

Metal deposits etching

Metal deposits hydrogen evolution

Metal deposits surface contamination

Metal deposits, characterization

Metal digital deposition

Metal organic chemical vapour deposition

Metal organic chemical vapour deposition MOCVD)

Metal organic chemical vapour deposition MOCVD) complexes

Metal organic chemical vapour deposition MOCVD) processes

Metal organic vapor-phase deposition

Metal oxide chemical vapor deposition MOCVD)

Metal oxide chemical vapor deposition precursors

Metal oxide nanostructures deposition techniques

Metal oxide synthesis electrochemical deposition

Metal oxides deposition

Metal oxides, cluster deposition

Metal polymer deposits

Metal substrate deposition

Metal vapor deposition

Metal-depositing bacteria

Metal-matrix composites chemical vapor deposition

Metal-matrix composites physical vapor deposition

Metal-organic chemical vapor deposition

Metal-organic chemical vapor deposition MOCVD)

Metal-organic chemical vapour deposition MOCVD) technique

Metal-organic deposition

Metal-organic vapor deposition

Metal-organic vapor deposition MOCVD)

Metallic films vacuum deposited

Metallic impurities, deposition

Metallic melt deposition

Metallic metal deposits

Metallic metal deposits

Metallic substrate, foreign, deposition

Metallic titanium deposition

Metals acid deposition influence

Metals deposition techniques

Metals nanocluster deposition

Mixed metal catalysts reductive deposition

Mixed metal oxides, deposition

Mixed metals reductive deposition

Monte Carlo Simulation Method and the Model for Metal Deposition

Morphology metal deposits

Nanostructured Metals and Alloys Deposited from Ionic Liquids

Noble metal deposition

Nucleation metal deposits

On the Metal Deposition Process during Hydrodemetallation of Vanadyl

Optical Spectroscopy to Study Metal Deposition

Organic Molecular Beam Deposition of Pentacene on Clean Metal Surfaces

Organo-metallic chemical vapor deposition

Over potential metal deposition

Oxidation metallic mineral deposits

Oxide film metal deposition

Photoelectrochemical deposition of metals

Photoelectrochemical metal deposition

Plasma Electrochemical Metal Deposition in Ionic Liquids

Plasma metal organic vapour deposition

Plasma technology sputtering/metallic deposition

Plating, metal deposition

Platinum electrodes metal deposition methods

Poly , metal deposition

Potential drop metal deposit

Practical Aspects of Metal Deposition

Processes Affecting the Deposition and Accumulation of Trace Metals in Long Island Sound Sediments

Pyrolysis metal deposition

Pyrolysis metal oxide deposition

Quantifying Adsorbate Inhibition of Metal Deposition

Rate determining processes metal deposition

Rate of metal deposition

Red bed-related base metal deposits

Redox-mediated metal deposition

Scanning electron microscopy metal deposition

Scanning electron microscopy metal oxide deposition

Selective metal deposition

Semiconductor nanoparticles metal-organic chemical-vapor deposition

Simultaneous deposition of metals

Soil mineralogy and geochemistry of surficial materials around the XY base-metal massive sulfide deposit, Selwyn Basin, Yukon

Solid-vapor-deposited metal-monomer

Space charge layer metal deposit

Spray pyrolysis metal deposition

Spray pyrolysis metal oxide deposition

Stranski-Krastanov heteroepitaxial metal deposition

Stress in Metal Deposits

Sub-monolayer Deposition of Ad-metals

Supported metal deposition

Supported metals chemical deposition, from metal colloid

Supported metals vapor phase deposition

Synthesis metal-organic chemical vapor deposition

Synthesis of metal nanoparticles (Au, Ag, Pt, Cu) on semiconductor surface by photostimulated deposition from solution

Template Deposition of Metals

The Deposition and Corrosion of Metals

Thin-film multilayer metal deposition processes

Tip induced local metal deposition

Trace metals ferromanganese deposits

Transition metals deposition

Underpotential Deposition of Metals on Foreign Substrates

Underpotential Deposition on Single-Crystal Pt Group Metals

Underpotential deposition of metals

Use Novel Techniques for Metal Oxide Synthesis and Deposition Able to Produce Stable Materials

Vapor-deposited metal

Vapor-deposited top metal contact

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