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Business English Exercises
 

Nanotube Technology

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Home > Teaching Business English > Business English Lessons, Advanced Level # 249
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CNTs (carbon nanotubes) have probably been around for a lot longer than was first realized, but ......... microscopy at that time was not advanced enough to distinguish them from other types of tubes.


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The first method for producing CNTs and fullerenes in ......... quantities was by applying an electric current across two carbonaceous electrodes in an inert gas atmosphere.


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This method is called plasma arcing: it involves the evaporation of one electrode as cations followed by ......... at the other electrode.


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The carbon arc discharge method is the most common and easiest way to produce CNTs, but it produces a complex mixture of components and requires further purification to separate the CNTs from the soot and the ......... catalytic metals present in the crude product.


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This method creates CNTs through arc-vaporization of two carbon rods placed end to end, separated by approximately 1mm, in an enclosure that is usually filled with ......... gas at low pressure.


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Another method of nanotube synthesis involves plasma arcing in the ......... of cobalt with a 3% or greater concentration.


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The nanotube product is a compact cathode deposit of rod-like ..........


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However, when cobalt is added, the nature of the product changes to a web, with strands of 1mm or so thickness that stretch from the cathode to the walls of the reaction ..........


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The ......... by which cobalt changes this process is unclear, however one possibility is that such metals affect the local electric fields and hence the formation of the five-membered rings.


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Arc-discharge and laser vaporization are currently the principal methods for obtaining small quantities of high quality CNTs, but both methods suffer from .........: the CNTs are difficult to purify, manipulate, and assemble for building nanotube-device architectures for practical applications.


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Business English Practice Exercises Business English Tests — several topics are covered: office matters, job applications, computer English, money expressions, business law, operations management, retail marketing, e-commerce, accounting terms, contracts and agreements, commercial correspondence, etc.
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