Evidence for C60 aggregation from solvent effects in [Ps–C60] molecular complex formation
✍ Scribed by Alok D. Bokare; Archita Patnaik
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 353 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0008-6223
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✦ Synopsis
Using a molecular probe positronium (Ps), Ps reaction rate constants (k) with C , a strong Ps acceptor, are determined for 60 the formation of a donor-acceptor type molecular complex in solvents of varying surface tension (s) and viscosity (h). Within the framework of Smoluchowski's theory of diffusion, the calculated Stokes radius for C in the different solvents 60 deviated from the monomeric value, implying the existence of aggregated clusters in solution and using transmission electron microscopy, C aggregation in carbon disulphide (CS ) is observed with the formation of spherical fractal clusters of |90 60 2 4 nm size with aggregation number 1.7310 and a fractal dimension of 1.9 at a concentration of 0.5 mM. The fractal dimension of 1.9 revealed the mechanism of aggregation to proceed through a diffusion limited process with the estimated 26 2 diffusion coefficient and the diffusion length of the aggregated cluster to be 2.27310 cm / s and 0.63 nm, respectively.