Active Metal

Active Metal

A term of art for any highly reactive metal—e.g., Mg2+ or Na+—which reacts with other elements. Most active metals are located in the first two columns of the periodic table.
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In addition to its primary function - measuring the specific surface area Sg (BET) of solid sorbents - the instrument also measures the dispersion, the size of the active metal surface, Brinsted and Lewis acidity, and the basicity and determination of the oxidation degree of the metal cations.
The results indicated the high dispersion of active metal species over support.
Willson knew that calcium was a more active metal than aluminum and he hoped that it would strip oxygen away from the aluminum oxide.
These process oils give corrosion protection under normal circumstances but once removed atmospheric corrosion can occur very quickly as mechanical production processes remove the oxide layers which form a natural protective coating exposing active metal surface to rusting and corrosion.
The Ceramospher HPLC column features optical-resolution packing material with high selectivity created from a spherical clay mineral carrying an optically active metal complex.
What the book lacks in the uniqueness of content/ideas, it makes up for with the sheer energy of the prose, an apt reflection of Richard's own 'Francium' (most active metal on earth) personality.
Among the topics are strength and margins of brazed joints, brazing diamonds and cubic boron nitride, active metal brazing of advanced ceramic composites to metallic systems, coating techniques using brazing, and the fluxless brazing of aluminum
Titanium is an active metal and it is oxidized quickly and forms a sticky layer of titanium oxide on the surface of titanium, which prevents the next stages of the reaction.
Meanwhile, active brazing does not require a metalized layer because it is a method that enables direct joining to ceramics with a single application of heat by improving the wettability (ease of application) to ceramics by adding active metal such as Ti, zirconium (Zr), hafnium (Hf), etc.
Hebburn Neighbourhood Inspector Ian King added: "We have increased patrols in the area and are using intelligence gathered to focus our efforts on active metal thieves.
Users can view catalyst support surfaces, as well as active metal nanoparticles.
From an aqueous corrosion standpoint, an active metal is one that will spontaneously react in normal aqueous environments under ambient conditions without the application of any external force or energy.