Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan.
Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan.
J Phys Chem B. 2021 Apr 1;125(12):3178-3183. doi: 10.1021/acs.jpcb.1c00780. Epub 2021 Mar 17.
Liquids confined in 10-100 nm spaces show different liquid properties from those in the bulk. Proton transfer plays an essential role in liquid properties. The Grotthuss mechanism, in which charge transfer occurs among neighboring water molecules, is considered to be dominant in bulk water. However, the rotational motion and proton transfer kinetics have not been studied well, which makes further analysis difficult. In this study, an isotope effect was used to study the kinetic effect of rotational motion and proton hopping processes by measurement of the viscosity, proton diffusion coefficient, and the proton hopping activation energy. As a result, a significant isotope effect was observed. These results indicate that the rotational motion is not significant, and the decrease of the proton hopping activation energy enhances the apparent proton diffusion coefficient.
在 10-100nm 空间中受限的液体表现出与本体液体不同的液体性质。质子转移在液体性质中起着至关重要的作用。在体相水中，质子通过相邻水分子之间的电荷转移进行转移，被认为是主要的质子转移机制。然而，质子的转动和转移动力学尚未得到很好的研究，这使得进一步的分析变得困难。在这项研究中，通过测量粘度、质子扩散系数和质子跳跃活化能，利用同位素效应来研究转动和质子跳跃过程的动力学效应。结果表明，观察到了显著的同位素效应。这些结果表明，转动运动并不显著，质子跳跃活化能的降低增强了表观质子扩散系数。
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