CAJ | 학술논문

本文提出了一种测量液相扩散系数的新方法.该方法用透明毛细管构成液相扩散池,利用毛细管成像法特有的折射率空间分辨测量能力,通过直接观察和记录扩散介质的等折射率薄层在毛细管中的移动规律,基于扩散过程遵循的Fick第二定律计算出液相扩散系数.在25?C下研究了丙三醇和纯水间的扩散过程,扩散系数的测量值与全息干涉法的文献报道值之间的相对误差为4.47%,论文同时分析了折射率测量精度和毛细管管壁黏滞力对扩散系数的影响.用毛细管成像法测量液相扩散系数具有样品需要量少、测量速度快、系统稳定性好的特点,为快速测定微量样品的扩散系数提供了一种有效的新方法.
본문제출료일충측량액상확산계수적신방법.해방법용투명모세관구성액상확산지,이용모세관성상법특유적절사솔공간분변측량능력,통과직접관찰화기록확산개질적등절사솔박층재모세관중적이동규률,기우확산과정준순적Fick제이정률계산출액상확산계수.재25?C하연구료병삼순화순수간적확산과정,확산계수적측량치여전식간섭법적문헌보도치지간적상대오차위4.47%,논문동시분석료절사솔측량정도화모세관관벽점체력대확산계수적영향.용모세관성상법측량액상확산계수구유양품수요량소、측량속도쾌、계통은정성호적특점,위쾌속측정미량양품적확산계수제공료일충유효적신방법.
A novel method for measuring the diffusion coefficient of liquids is introduced in this paper. A transparency capillary is used as both diffusive pool and imaging element, spatially resolving ability of the capillary in measuring refractive index of liquid is utilized to observe and record diffusive process directly, diffusion coefficient of liquid is calculated based on Fick second law and acquired experimental data. With the new method, the diffusive process of pure glycerol in water at 25 ?C is investigated, the obtained diffusion coefficient is 0.898×10?5 cm2/s, which is of a relative error 4.47%compared with the literature value measured by the holographic interference. The influence of measurement accuracy of refractive index and capillary viscosity on measuring result is also analyzed. The method is characterized by micro-quantity sample required, faster measurement and better stability, which opens a new way to measure diffusion coefficient of liquid medium.