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The shell can also be an organic molecule to which a biological molecule is later conjugated, furthering the modularity of core–shell structure. The most popular core/shell pair used is CdSe core with ZnS or CdS shell, which improves the quantum yield and protects against photobleaching compared to that of the core material alone.
Mercury selenide (HgSe; sometimes mercury(II) selenide) is a chemical compound of mercury and selenium. It is a grey-black crystalline solid semi-metal with a sphalerite structure. The lattice constant is 0.608 nm. HgSe occurs naturally as the mineral Tiemannite, and is a component of the "intimate mixture" of HgSe and Se known as HgSe 2. [1]
Cadmium selenide is an inorganic compound with the formula Cd Se. It is a black to red-black solid that is classified as a II-VI semiconductor of the n-type . It is a pigment, but applications are declining because of environmental concerns.
Tiemannite is a mineral, mercury selenide, formula HgSe. It occurs in hydrothermal veins associated with other selenides, or other mercury minerals such as cinnabar , and often with calcite . Discovered in 1855 in Germany, it is named after Johann Carl Wilhelm Tiemann (1848–1899).
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Structure of a-HgS looking at the a-axis Structure of a-HgS looking at the c-axis. HgS is dimorphic with two crystal forms: red cinnabar (α-HgS, trigonal, hP6, P3221) is the form in which mercury is most commonly found in nature.
The price of mercury has been highly volatile over the years and in 2006 was $650 per 76-pound (34.46 kg) flask. [51] Mercury is extracted by heating cinnabar in a current of air and condensing the vapor. The equation for this extraction is: HgS + O 2 → Hg + SO 2 Evolution of mercury price (U.S.) and production (worldwide)
B or b – prefix denoting a number in billions; BA – bottom assembly (of a riser) bbl – barrel bbl/MMscf – barrels per million standard cubic feet