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In situ observation of subcritical crystalline particles and their behavior on growth of KDP crystals from aqueous solution by light-scattering technique

Published online by Cambridge University Press:  31 January 2011

Li Lian ,
Lu Taijing ,
Kazufumi Sakai  and
Tomoya Ogawa
Li Lian
Affiliation:
Department of Physics, Gakushuin University, Mejiro 1-5-1, Toshima-ku, Tokyo, 171 Japan
Lu Taijing
Affiliation:
Institute of Physical and Chemical Research (RIKEN), Hirosawa 2-1, Wako-shi, Saitama, 351-01 Japan
Kazufumi Sakai
Affiliation:
Department of Physics, Gakushuin University, Mejiro 1-5-1, Toshima-ku, Tokyo, 171 Japan
Tomoya Ogawa
Affiliation:
Department of Physics, Gakushuin University, Mejiro 1-5-1, Toshima-ku, Tokyo, 171 Japan
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Abstract

By the 90° laser light-scattering technique, it was possible to visualize ultrafine crystalline particles and to investigate their behavior in relation to the growth of KDP crystals in an aqueous solution. It was found that the scattered microparticles move randomly and exist inhomogeneously in the solution. The density of microparticles increases with increasing supersaturation. Whereas in the bulk solution, the movements of the particles are slow, as soon as they approach the crystal, they are rapidly sucked into the surface to within a certain distance, corresponding to the thickness of the diffusion boundary layer. On the growing surface, they move or shake themselves for a while, and eventually become invisible. The crystal growth rate increases proportionally with increasing the density of the microparticles and the supersaturation. The results suggest that they are subcritical crystalline particles which are formed in the KDP solution, and contribute to the crystallization of KDP from the aqueous solution.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 12 , December 1992 , pp. 3275 - 3279
Copyright
Copyright © Materials Research Society 1992

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References

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