Search results
Results from the WOW.Com Content Network
The C 60 fullerene dimerizes in a formal [2+2] cycloaddition to a C 120 bucky dumbbell in the solid state by mechanochemistry (high-speed vibration milling) with potassium cyanide as a catalyst. [47] The trimer has also been reported using 4-aminopyridine as catalyst (4% yield) [48] and observed with scanning tunneling microscopy as a monolayer ...
Nested closed fullerenes have been named bucky onions. Cylindrical fullerenes are also called carbon nanotubes or buckytubes. [1] The bulk solid form of pure or mixed fullerenes is called fullerite. [2] Fullerenes had been predicted for some time, but only after their accidental synthesis in 1985 were they detected in nature [3] [4] and outer ...
They are called intrinsic polymeric fullerenes, or more often all C 60 polymers. Fullerene can be part of a polymer chain in many different ways. Fullerene-containing polymers are divided into following structural categories: Intrinsic polymeric fullerene (homopolymer), Main-chain polymers, Side-chain polymers, Star polymers, Crosslinked polymers,
These properties recommend DBU for use as a catalyst, for example as a curing agent for epoxy resins and polyurethane. It is used in the separation of fullerenes in conjunction with trimethylbenzene. It reacts with C 70 and higher fullerenes, but not with C 60. It is useful for dehydrohalogenations. [7]
Just as in other fullerene reactions like the Bingel reaction or Diels-Alder reactions this reaction can be reversed. A thermal cycloelimination of a pyrrolidinofullerene with a strong dipolarophile such as maleic acid and a catalyst such as Wilkinson's catalyst or copper triflate in 1,2-dichlorobenzene at reflux 8 to 18 hours regenerates the pristine C 60 fullerene. [9]
These endohedral fullerenes are usually synthesized by doping in the metal atoms in an arc reactor or by laser evaporation. These methods gives low yields of endohedral fullerenes, and a better method involves the opening of the cage, packing in the atoms or molecules, and closing the opening using certain organic reactions. This method ...
Shares of Marvell Technology (NASDAQ: MRVL) were surging today after the semiconductor maker posted better-than-expected results in its third-quarter earnings report, driven in part by strong AI ...
It uses carbon monoxide as the carbon source and iron pentacarbonyl or nickel tetracarbonyl as a catalyst. These catalysts provide a nucleation site for the nanotubes to grow, [96] while cheaper iron-based catalysts like Ferrocene can be used for CVD process. Vertically aligned carbon nanotube arrays are also grown by thermal chemical vapor ...