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Standing-seam metal roof with concealed fasteners. Mechanically seamed metal with concealed fasteners contains sealant in seams for use on very low sloped roofs, suitable for roofs of low pitch such as 0.5/12 to 3/12 pitch. Flat-seam metal with or without soldered seams. Steel coated with a coloured alloy of zinc and aluminium. Stone-coated ...
Nails are made in a great variety of forms for specialized purposes. The most common is a wire nail. [2] Other types of nails include pins, tacks, brads, spikes, and cleats. Nails are typically driven into the workpiece by a hammer or nail gun. A nail holds materials together by friction in the axial direction and shear strength laterally.
Graphite, named by Abraham Gottlob Werner in 1789, from the Greek γράφειν (graphein, "to draw/write", for its use in pencils) is one of the most common allotropes of carbon. Unlike diamond, graphite is an electrical conductor. Thus, it can be used in, for instance, electrical arc lamp electrodes.
Fullerenes had been predicted for some time, but only after their accidental synthesis in 1985 were they detected in nature [3] [4] and outer space. [5] [6] The discovery of fullerenes greatly expanded the number of known allotropes of carbon, which had previously been limited to graphite, diamond, and amorphous carbon such as soot and charcoal.
Graphite consists of sheets of trigonal planar carbon. [18] [19] The individual layers are called graphene. In each layer, each carbon atom is bonded to three other atoms forming a continuous layer of sp 2 bonded carbon hexagons, like a honeycomb lattice with a bond length of 0.142 nm, and the distance between planes is 0.335 nm. [20]
There are also differences between the properties of a monolayer compared to the bulk material: the Hall mobility at room temperature is drastically lower for monolayer 2H MoS 2 (0.1–10 cm 2 V −1 s −1) than for bulk MoS 2 (100–500 cm 2 V −1 s −1). This difference arises primarily due to charge traps between the monolayer and the ...
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In a similar fashion in 2001 it was found that the carbon allotrope fullerene, C 60 reacts with fluorine gas to give fullerene fluorides with stoichiometries up to C 60 F 48. [3] A precursor of carbon monofluoride is the fluorine-graphite intercalation compound, also called fluorine-GIC. Other intercalation fluorides of carbon are:
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