- Rapid Communication
- Access by Xinjiang University
Depolarized dynamic light scattering from optically anisotropic reaction-limited aggregates
Phys. Rev. E 48, R2358(R) – Published 1 October, 1993
DOI: https://doi.org/10.1103/PhysRevE.48.R2358
Abstract
We have used small-angle depolarized dynamic light scattering in conjunction with aggregates of (rather unique) optically anisotropic spherical particles. Pure rotational diffusion is observed, and all the relevant information on a reaction-limited aggregation has been derived as a function of time. We show that the asymptotic form of the cluster mass distribution is actually attained during the very early stages of the process. The value of the exponent τ characterizing the low-mass portion of the cluster distribution is derived.
References (12)
- G. K. von Schulthess, G. B. Benedek, and R. W. De Blois, Macromolecules 13, 939 (1980).
- D. A. Weitz and M. Y. Lin, Phys. Rev. Lett. 57, 2037 (1986).
- J. E. Martin, Phys. Rev. A 36, 3415 (1987).
- M. Y. Lin, H. M. Lindsay, D. A. Weitz, R. C. Ball, R. Klein and P. Meakin, Phys. Rev. A 41, 2005 (1990).
- M. L. Broide and R. J. Cohen, Phys. Rev. Lett. 64, 2026 (1990).
- J. E. Martin and B. J. Ackerson, Phys. Rev. A 31, 1180 (1985).
- B. Berne and R. Pecora, Dynamic Light Scattering (Wiley, New York, 1975).
- R. Piazza and V. Degiorgio, Opt. Commun. 92, 45 (1992).
- R. Piazza, V. Degiorgio, M. Corti and J. Stavans, Phys. Rev. B 42, 4885 (1990).
- F. Mantegazza, M. Giardini, R. Piazza and V. Degiorgio, J. Phys. Condens. Matter 4, 8683 (1992).
- V. Degiorgio, R. Piazza, F. Mantegazza and T. Bellini, J. Phys. Condens. Matter 2, SA69 (1990).
- The monomer rotational diffusion coefficient FTHETA has been determined by low-angle DDLS from a nonaggregated sample. Incidentally, we derive from this measurement = 42 nm, in good agreement with the polarized DLS value = 45.8 nm.