noble metal


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metal

 [met´'l]
any chemical element marked by luster, malleability, ductility, and conductivity of electricity and heat, and which will ionize positively in solution. adj., adj metal´lic.
alkali metal one of a group of monovalent elements including lithium, sodium, potassium, rubidium, and cesium.
metal fume fever an occupational disorder with malaria-like symptoms occurring in those engaged in welding and other metallic operations and due to the volatilized metals. It includes brassfounder's fever (brass chill, brazier's chill) and spelter's fever (zinc chill, zinc fume fever).
heavy metal one with a high specific gravity, usually defined to be above 5.0.
heavy metal poisoning poisoning with any of the heavy metals, particularly antimony, arsenic, cadmium, lead, mercury, thallium, or zinc.
noble metal a metal that is highly resistant to oxidation and corrosion.

no·ble met·al

a metal that cannot be oxidized by heat alone, nor readily dissolved by acid, for example, gold, platinum.
Synonym(s): noble element

noble metal

A metal that resists corrosion or oxidation. Examples are gold, platinum, and silver.
See also: metal

no·ble met·al

(nōbĕl metăl)
Any metallic element used in dental restorations and appliances that resists tarnish, corrosion, and oxidation during heating or in intraoral environments (e.g., gold, platinum).
References in periodicals archive ?
From a review of catalytic oxidation of VOCs by a supported noble metal catalyst, the water vapor was generally found to be an inhibitor (Liotta 2010).
Metal nanoparticles generally take advantage of the electromagnetic field enhancement of noble metal nanoparticles resulting from the surface plasmon oscillations, creating variations in nanoparticles characteristics that can be leveraged to achieve better fuel cell catalysts.
The system is a critical enabler for etching noble metal electrode and capacitor materials, including PZT, as well as other ferroelectric, magnetic, high-K dielectric, compound semiconductor and interconnect materials.
Parsons was Vice President of Sales and Marketing for Noble Metal Processing, the Company's operating subsidiary.
Alloying platinum with noble metals such as cobalt reduces the overall cost, but such alloyed catalysts vary in performance based on their atomic structure and processing history.
And although the water supply is essentially limitless, a major roadblock to a future "hydrogen economy" is the need for platinum or other expensive noble metals in the water-splitting devices.
Oxidation-resistant noble metals, like platinum, which are used in water splitting devices, are rare and expensive -- limiting hydrogen's potential as alternative fuel source.
Current fuels cells operate at 800+ degrees Celsius, which require the use of expensive noble metals.
Thieves are often after the small amounts of platinum, palladium and other noble metals used in their construction.
The elimination of noble metals is saving cost, but [using enzymes] also widens the range of fuels that can be used," says Paul Kenis, a chemical engineer at the University of Illinois at Urbana-Champaign.
According to Fukui, the company will need to reduce the amount of noble metals used for fuel cells, improve hydrogen storage and lower production costs of hydrogen before mass production is possible.