Ultrafine (30-40 nm) fullerene particles were generated via vapor cond
ensation in a continuous flow system starting from pure C60 and mixed
fullerene extract (C60/C70). Gas-phase particle size distributions wer
e measured using a condensation particle counter and differential mobi
lity analyzer. Particle morphology and crystallinity were studied by S
EM and TEM. Particles were partly amorphous at 400-degrees-C, and beca
me crystalline C60 when processed above 500-degrees-C. The particles h
ad an average size of 30, 35 and 40 nm and total number concentrations
of 2.2 X 10(6) 3.5 X 10(6), and 5.0 x 10(6) number of particles/cm3,
respectively at 500, 525 and 550-degrees-C.