When two dissimilar materials are in contact, the more active one will tend to have accelerated corrosion while the corrosion rate of the more noble metal
In recent years, there are significant efforts to search cheap metal nanoparticles in order to displace noble metal
nanoparticles such as Au, Ag, and Pt, although the studies still have little research.
The surface plasmon resonance of noble metal
nanoparticles can be easily monitored with UV-Vis spectroscopy , which directly determines the size and concentration of gold nanoparticles .
The most important factors controlling the catalytic activity of nanoscale noble metal
catalysts appear to be the particle size, nature of support, and noble metal
oxidation state .
There is a growing movement among semiconductor manufacturers to replace gold wire, which is currently the most widely used bonding wire for connecting lead frames and IC chips, with copper wire, which enables the cost of noble metal
bullion to be reduced by approximately 90 percent.
Cluster of noble metals
can be produced by thermal decomposition of their mercaptides at moderately low temperatures (180-250[degrees]C).
Moen Incorporated has received a patent for an article having on at least a portion of its surface, a coating of a thin transition layer consisting of a metal bearing material and having a composition that varies from an exterior first composition comprising a metal to a second composition beneath the exterior first composition, which transition layer is superimposed on a metal bearing color layer and is substantially transparent and colorless to visible light, in which the first composition is a noble metal
chosen from the group consisting of gold, silver, platinum, platinum group metals, or an alloy thereof.
The metal was chosen for this year's award after evidence showing sales in the so called 'noble metal
' have risen in the last five years from 500 ounces to 45,000 ounces.
Pd is a noble metal
, and the concentration in nature is very low.
Moreover, the effect of metal substrate was also tested: Ag substrate is comparably suited for Glaser coupling [25, 26], and Glaser coupling can be used highly efficiently to generate linear oligomer/polymer along the step-edges of the noble metal
vicinal surface while inhibiting a variety of side-reactions resulting in irregularly branched polymeric networks .
But gold is an expensive noble metal
and the price is unpredictable, strongly affecting manufacturing profit margins and, in the end, component prices.