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P. Wette(1), I. Klassen (1), D. Herlach (1), H.J. Schöpe(2), T. Palberg(2)
(1) Deutsches Zentrum für Luft- und Raumfahrt, Linder Höhe, 51147 Cologne, Germany (2) Universität Mainz, Institut für Physik, Staudinger Weg 7, 55099 Mainz, Germany We report on the solidification kinetics of deionised aqueous suspensions of charged latex spheres under deionized conditions in dependence on the particle density n. Samples of equilibrium crystalline structure were shear molten and the meta-stable melt left to solidify after cessation of shear. Nucleation rate densities obtained from average crystallite sizes determined with static light scattering and polarization microscopy experiments. At low particle concentration polarization microscopy also allows direct measurement of the nucleation rate densities. Thus, by combination of different methods, reliable nucleation rate densities are now available over roughly one order of magnitude in n and eight orders of magnitude in J. Data are interpreted in terms of classical nucleation theory to obtain a linearly increasing melt/crystal surface tension. These data were compared with those of metallic systems. |
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