Coins, atomic force

In February 1935, a fiber known in the laboratory as fiber 66 was produced that held promise for commercialization. The 66 refers to the number of carbon atoms in the reactants used to produce it. In the case of fiber 66, the two sixes refer to the six carbon atoms in adipic acid and six carbon atom in hexamethylenediamine, H2N(CH2)6NHr Fiber 66 was the first nylon produced. Like rayon, nylon is a generic term used for a group of synthetically produced polyamides. The name nylon was not introduced until 1938 after an extensive discussion by DuPont on what to call fiber 66. There are several versions of how the name nylon was coined, but one claims that nylon was a modification of norun (no run), which was modified into a unique name that could be used to market the product. DuPont officials had hoped to keep the name secret until the 1939 World s Fair, but leaks and patent preparation forced them to reveal the name early. DuPont did not trademark the name, but promoted the material genetically as nylon. 

Derjaguin used this approach to calculate the interaction between two ellipsoids [84]. The same approximation was also introduced in 1977 by Blodd et al. [85] for calculating interaction forces between nuclei of atoms. They coined the term proximity forces in their publication. While the term Derjaguin approximation is stUl the standard term in surface science, the term proximity force approximation has become popular among physicists in the field of nuclear physics and the Casimir force (see Section 2.6). 

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