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Kinetics and mechanism relevant to TiSiN chemical vapor deposition from TDMAT, silane and ammonia

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Kinetics and mechanisms of copper electrodissolution in chloride media

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JES Ring-disk electrode studies of anodic polarization of Cu in acidic chloride solns. indicate 4 distinct potential regions: apparent Tafel, peak current and current min. limiting current, and potentials above limiting current region. Ring currents measured flux of CuI and CuII species from disk. Dependence of disk and ring currents on H+ and Cl- and on rotating rate has been determined. Models describe Cu electro-dissolution in apparent Tafel region and potential region > limiting currents. Mixed mass-transfer and kinetic control with CuCl complex is limiting diffusion species in apparent Tafel region. At potentials > limiting current region, there is simultaneous mass-transfer control of CuCl complex and kinetic control of Cu++ formation via reaction, CuCl2- = Cu++ = 2Cl- + e. Within peak current and current min. region and limiting current region, Cu electrodissolution by mass transport is controlled in accord with previous work.

Kinetics and microstructure of titanium nitride coatings by CVD

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SURF Titanium nitride coatings obtained by CVD with TiCl4, H2, and N2 as gas sources at atmos. pressure were examined. Deposition rate increased and reached a saturated value with increasing TiCl4 partial pressure at different parameters incl. deposition temps. and partial pressures of H2 and N2. Reaction orders of TiCl4, H2, and N2 were extracted. For TiCl4 or N2, reaction order is influenced by partial pressure of other. Degraded growth rate at 1200°C was mainly related to endothermic CVD titanium nitride reaction and hot-wall reactor. Surface morphology changed with process parameters. Compositional analysis of CVD titanium nitride showed non-stoichiometric at low temps. and 1200°C, but stoichiometric at 1000°C. titanium nitride stoichiometry could be affected by partial pressures of N2 and H2.

Kinetics and multiple steady states in the chemical vapor deposition of titanium carbide.

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Kinetics and pH dependence of chromium(VI) reduction by iron(II)

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Reaction kinetics of reduction were studied between pH 2-7.2 with UV/visible spectroscopy and multi-component fitting, method without interference of added reagents. Reaction was minimal around pH 4. Reduction is relevance to behaviour of Cr(VI) in environment. 50 refs.

Kinetics and Thermodynamics of the Electrodeposition of Palladium, Thallium, and Tellurium from Different Baths.

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RUS

Kinetics and thermodynamics of the electrodeposition of palladium, thallium, and tellurium from different baths.

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Some kinetic and activation thermodynamic functions for the electrodeposition of palladium, thallium, and tellurium from the best selected baths, viz. niclosamide bath [5-chloro-N-(2-chloro-4-nitrophenyl)-2-hydroxybenzamide] for Pd, alizarin red bath for Tl, and salicylaldehyde bath for Te, are determined. Reaction rate constant (k), half-lifetime (t(1/2)), activation energy (E-a), and such activation thermodynamic parameters as entropy change (Delta S*), enthalpy change (Delta H*), and Gibbs free energy (Delta G*) are calculated by applying the rate theory of the first-order reaction and the Eyring theory of the reaction rate. The effect of temperature change in the range of 30-60 degrees C on the above parameters is studied and discussed. The effect of metal type on both the reaction rate and the activation energy is also investigated.

Kinetics of acid etching of disperse metallic systems

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PROT Kinetics of disperse material leaching are studied by modified 'powder dissolution' method.

Kinetics of Aluminium Chromating

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Focus on effect of temperature but also other parameters such as dichromate conc'n, potassium fluoride conc'n, agitation & time. Weight change was used to follow kinetics. Effect of bath conductivity is also examined & an empirical equation is derived to represent kinetics. Reaction order & activation energies are also given, as are Free energies. Arrhenius equation is derived. 8 refs

Kinetics of anode processes in 'Chromispel-C' electrolyte for chromium plating.

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Title electrolyte is non-standard hexavalent, chloride-based. Its numerous advantages, including low-temperature operation and wide range of current densities are noted. It is, however, highly corrosive. Tables show limiting current densities under a wide range of conditions. Arrhenius plots are also shown as are polarisation curves with a range of anode materials. These include platinum, silver, lead, lead-calcium alloy and M10 and P25 ceramal alloys. M10 is an alloy of carbides of tungsten, titanium and tantalum and 18% cobalt, readily passivated by strong oxidising agent and was the most stable of the anodes tested here. P25 has similar composition to M25 but with only 10% cobalt. The various electrochemical processes taking place at the anode are distinguished from one another and their mechanisms reported individually. Polarisation plots are shown for the various anode materials. 28 references

Kinetics of anodic dissolution and repassivation on stainless steel 304LO in solutions containing nitrate.

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JES

Kinetics of Anodic Dissolution of Alloys of the Ag-Au System

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Kinetics of Anodic Dissolution of Gold in Alkali-Cyanide Solutions: Effect of Lead Ions

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RUS Abstr. avail. online (RE)

Kinetics of Anodic Dissolution of Gold in Cyanide Solutions Containing Bismuth Hydroxy Compounds

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RUS Abstr. avail. online (RE)

Kinetics of Anodic Dissolution of Gold in Cyanide Solutions Containing Thallium Ions: Potentiostatic Measurements

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RUS Abstr. avail. online (RE)