Spatial and Temporal Fluctuations in a Phase-Separating System near the Critical Point

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概要

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• Light scattering and direct microscope measurements were used to probe phase separation in a critical mixture of 2, 6-lutidine and water, a system with a lower consolute point. Rapid quench rates were achieved by microwave heating. On quenching from the one-phase state through the critical temperature Tc, the average size l(t) of the nucleating regions exhibited a growth rate given by l∝t^a', with a'=0.38±0.08. However at a characteristic size l sime 10u, a cross-over to more rapid coarsening was observed, with a'=1.7±0.4. In a second set of experiments, the system was quenched from an initial twophase state (at an equilibrium phase separation temperature Tps), to a final temperature just slightly above the cloud-point temperature. In these off-critical quenches the coarsening was much slower, with a'=0.23±0.03 for 145 mK -__<T_<ps>-T_c-__<890 mK. Also measured was the power spectrum of the temporal fluctuations in the scattered light intensity. The spectra were strongly non-Lorentzian, suggesting that the composition fluctuations are not dominated by diffusion.

• 1979-04-01

著者

• Kim Mahn

  Department Of Chemistry Division Of Molecular And Life Science Pohang University Of Science And Tech

• Kim Mahn

  Department Of Physics And Astronomy University Of Pittsburgh

• GOLDBURG Walter

  Department of Physics and Astronomy, University of Pittsburgh

• SCHWARTZ Arthur

  Department of Physics and Astronomy, University of Pittsburgh

• Goldburg Walter

  Department Of Physics And Astronomy University Of Pittsburgh

• Schwartz Arthur

  Department Of Physics And Astronomy University Of Pittsburgh : Now At Physics Department Carnegie-me

• SCHWARTZ Arthur

  Department of Physics and Astronomy, University of Pittsburgh : Now at Physics Department, Carnegie-Mellon University

• KIM Mahn

  Department of Physics and Astronomy, University of Pittsburgh

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• Spatial and Temporal Fluctuations in a Phase-Separating System near the Critical Point

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