Meng Weidong, Xia Yan, Chen Yan, Pu Xiaoyun
Department of Physics, Yunnan University, Kunming, Yunnan, 650091, China.
International Research Center for Optoelectronic Energy Materials Yunnan University, Kunming, 650091, China.
Sci Rep. 2018 Aug 22;8(1):12610. doi: 10.1038/s41598-018-30650-z.
The mutual diffusion coefficient of heavy water in normal water is measured over a temperature range of 20 to 40 °C using a novel method called the shift of equivalent refractive index slice (SERIS). The measured values range from 1.9086 × 10 to 3.0860 × 10 cm/s and fit the Arrhenius equation well, and the calculated data from the equation are consistent with the literature values obtained by the interference method. The SERIS method is based on a double liquid-core cylindrical lens (DLCL); the front liquid core of the DLCL is used as both a liquid diffusion cell and a key imaging lens, and the resolvable minimum of liquid refractive index is δn = 6.15 × 10. The rear liquid core is used as an aplanatic lens, and the transversal spherical aberration is less than 1 μm. The SERIS method provides a new way to measure mutual diffusion coefficients of liquid and has the following advantages: visual measurement, use of a simplified device, and easy operation.
采用一种名为等效折射率切片位移（SERIS）的新方法，在20至40°C的温度范围内测量了重水在普通水中的互扩散系数。测量值范围为1.9086×10至3.0860×10 cm/s，与阿伦尼乌斯方程拟合良好，该方程计算的数据与通过干涉法获得的文献值一致。SERIS方法基于双液芯柱面透镜（DLCL）；DLCL的前液芯既用作液体扩散池又用作关键成像透镜，可分辨的液体折射率最小值为δn = 6.15×10。后液芯用作消球差透镜，横向球差小于1μm。SERIS方法为测量液体的互扩散系数提供了一种新途径，具有以下优点：测量直观、设备简化、操作简便。
