We have shown that simple power-law dynamics is expected for
flexible fractal objects. Although the predicted behavior is well
established for linear polymers, the situationm is considerably
more complex for colloidal aggregates. In the latter case, the
observed K-dependence of (r) can be explained either in terms of
non-asymptotic hydrodynamics or in terms of weak power-law
polydispersity. In the case of powders (alumina, in particular)
apparent fractal behavior seen in static scattering is not found in
the dynamics. ID. W. Schaefer, J. E. Martin, P. Wiitzius, and D. S.
Cannell, Phys. Rev. Lett. 52,2371 (1984). 2 J. E. Martin and D. W.
Schaefer, Phys. Rev. Lett. 5:1,2457 (1984). 3 D. W. Schaefer and C.
C. Han in Dynamic Light Scattering, R. Pecora ed, Plenum, NY, 1985)
p. 181. 4 P. Sen, this book. S J. E. Martin and B. J. Ackerson,
Phys. Rev. A :11, 1180 (1985). 6 J. E. Martin, to be published. 7
D. A. Weitz, J. S. Huang, M. Y. Lin and J. Sung, Phys. Rev. Lett.
53,1657 (1984) . 8 J. E. Martin, D. W. Schaefer and A. J. Hurd, to
be published; D. W. Schaefer, K. D. Keefer, J. E. Martin, and A. J.
Hurd, in Physics of Finely Divided Matter, M. Daoud, Ed., Springer
Verlag, NY, 1985. 9 D. W. Schaefer and A. J. Hurd, to be published.
lOJ. E. Martin, J. Appl. Cryst. (to be published).
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