コロイド結晶化における核形成ダイナミクス(<小特集>微小重力環境を利用した結晶成長)

概要

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The growth dynamics of colloidal crystallization was evaluated under sedimentation free conditions using sounding rocket and Brownian Dynamics (BD) simulation. The Bragg's reflections of colloidal crystals were measured during microgravity flight and average sizes of crystallites were obtained by the Sherrer's method. Results showed a power-law relationship between size and time, L∞t^α where L is the size of crystallites and t is time. The obtained as were 0.33±0.03 in microgravity and 0.25±0.02 in normal gravity, respectively. Browninan Dynamics (BD) simulation showed the time evolution of ordered domains that consisted of connected structures of crystalline clusters. The power law relationship n∞t^<0.5> in nucleation period was confirmed between the number of particles (n) in clusters and time(t). The calculated power was related to a using the fractal dimension of crystalline clusters and α=0.31 was obtained. The value was matched well with that of the microgravity experiment.
日本結晶成長学会の論文
2002-10-05