Accession Number:

ADA265489

Title:

Cyclocarbon Coalescence: Mechanisms for Tailormade Fullerene Formation

Descriptive Note:

Technical rept.,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Report Date:

1993-05-27

Pagination or Media Count:

17.0

Abstract:

The availability of macroscopic quantities of fullerenes has resulted in a vast number of physical and chemical studies of these new materials. However, the mechanisms that lead to the formation of these spherical carbon allotropes are not well understood. Mass spectral evidence has been obtained for the size-selective growth of fullerenes through the coalescence of cyclon carbons, molecular carbon allotropes consisting of monocyclic rings with n carbon atoms. Whereas coalescence of cyclo30carbon cyclo-C30 produces predominantly buckminster fullerene C60, the smaller rings cyclo-C18 and cyclo-C24 preferentially produce fullerene C70 through distinct intermediates. The present studies not only provide new insights into fullerene formation mechanisms but also raise the possibility of tailoring the size distributions of fullerenes by variation of the appropriate properties of the precursors.

Subject Categories:

  • Inorganic Chemistry
  • Manufacturing and Industrial Engineering and Control of Production Systems
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE