Formation of C H Ablation of Graphite, Coal or C Particles Suspended in Selected Solvents - Polyynes: Synthesis, Properties, and Applications - page 136

FIGURE 7.8 Absorbances of C n H 2 polyynes in hexane solution after 355, 532, and
1064 nm laser irradiation on Tanito Harum and Workworth coals for 60min.

increasing n. The relative abundance of n 4 and 5 polyynes from Work-

worth at 355 nm laser irradiation is larger than that from Tanito Harum by
a factor of about 2. Combining this result with elementary analysis data for
these two coals shows that the formation rate of polyynes from a coal with
a larger C/O ratio is faster. The relative abundance of polyynes decreases
significantly with increasing laser wavelength, and no polyynes were
observed at 1064 nm laser irradiation from both coals.

¼

7.3.3 P OLYYNES FROM C 60

Two kinds of experiments were carried out for C 60 , because solubility
of C 60 depends strongly on the solvent. In the first experiment, C 60 was