Abstract
Time-resolved light scattering was used to study the time evolution of phase separation in a critical mixture of 2,5-hexanediol and benzene in the spinodal region. The early stage behavior of spinodal decomposition where the linearized theory of Cahn–Hillard is valid has been observed. The wave number and the interdiffusion coefficient characteristic of the early stage were well described by three-dimensional Ising model values, and the symmetric law of critical point universality was ascertained. A shoulder was observed at the higher scattering angle region in the structure factor and its wave number dependence was well expressed by the Porod law in the later stage of spinodal decomposition. The scaled behavior of the scattering function relating to the time evolution of phase separation was examined. The present result is in good agreement with the recent dynamic scaling theory.
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