Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Dynamics and Transport of Molecules Studied by Transient Grating Method : Methyl Red in Solution

  • Published : 1996.04.20
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Abstract

Time profile of the transient grating signal induced by a nanosecond pulsed laser excitation of methyl red is investigated in alcohols and toluene at several solvent temperatures. The signal decays biexponentially with well-separated time constants; the faster decay is identified as due to thermal diffusion of the solvents and the slower one as mainly due to translational diffusion of the solute. The measured translational diffusion constants of methyl red in toluene are close to a hydrodynamic prediction with a slip boundary condition while those in alcohols are larger by 30% and increase slightly with the size of alcohols. We compare the results with modified hydrodynamic models.

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