Chemistry of inorganic compounds – Carbon or compound thereof – Elemental carbon
Reexamination Certificate
2005-09-06
2005-09-06
Hendrickson, Stuart (Department: 1754)
Chemistry of inorganic compounds
Carbon or compound thereof
Elemental carbon
C977S726000
Reexamination Certificate
active
06939524
ABSTRACT:
A solid phase or form of carbon is based on fullerenes with thirty six carbon atoms (C36). The C36structure with D6hsymmetry is one of the two most energetically favorable, and is conducive to forming a periodic system. The lowest energy crystal is a highly bonded network of hexagonal planes of C36subunits with AB stacking. The C36solid is not a purely van der Waals solid, but has covalent-like bonding, leading to a solid with enhanced structural rigidity. The solid C36material is made by synthesizing and selecting out C36fullerenes in relatively large quantities. A C36rich fullerene soot is produced in a helium environment arc discharge chamber by operating at an optimum helium pressure (400 torr). The C36is separated from the soot by a two step process. The soot is first treated with a first solvent, e.g. toluene, to remove the higher order fullerenes but leave the C36. The soot is then treated with a second solvent, e.g. pyridine, which is more polarizable than the first solvent used for the larger fullerenes. The second solvent extracts the C36from the soot. Thin films and powders can then be produced from the extracted C36. Other materials are based on C36fullerenes, providing for different properties.
REFERENCES:
Stankevich, I.V. et al., Polyhodral Carbon Clusters C36+12n(n≳0) And Their Hydrocarbon Analogs as Predecessors of (6,0)-Tubular Structures' Modular Materials vol. 10 pp. 169-174 (1998).
Service, ‘New Fullerence Rounds out the Family’ inSiencevol. 280 #5372 p. 2044, Jun. 1998.
Cohen Marvin L.
Cote Michel
Grossman Jeffrey C.
Louie Steven G.
Piskoti Charles R.
Berkeley National Laboratory
Hendrickson Stuart
Nold Charles R.
The Regents of the University of California
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