MEASUREMENT OF THE CONCENTRATION DEPENDENCY OF MASS DIFFUSION COEFFICIENTS IN AQUEOUS BINARY SOLUTIONS BY PHASE-SHIFTING INTERFEROMETER
A novel technique to determine the mass diffusion coefficient as a function of concentration in aqueous solutions was developed. The concentration dependency of the mass diffusion coefficient of Sodium Chloride (NaCl), Sucrose and Lysozyme was measured over a wide concentration range. In order to determine the concentration dependency, several diffusion experiments for the same solute were made at different concentrations. The experiment consists on creating a one-dimensional diffusion field at very small concentration gradients such that the mass diffusion coefficient within the range can be assumed constant. The concentration difference between these two solutions was set to 2 mg/ml, which is sufficiently small in order to assume constant mass diffusion coefficients as indicated by our results. The mass diffusion coefficient was determined from the experimental concentration profiles by inverse analysis. The objective function, which was defined as the area between the experimental and numerical concentration profiles, was used in order to compare the experimental concentration distribution with the numerical solution of the diffusion field. The results for NaCl and Sucrose show a good agreement with the literature over a wide range of concentration. Furthermore, the trend of the concentration dependency of the mass diffusion coefficient of Lysozyme was reported. The relationship between the concentration and the mass diffusion coefficient was discussed for the experimental results.
Atsuki Komiya Juan F. Torres Junnosuke Okajima Shigenao Maruyama
Institute of Fluid Science Tohoku University Sendai, Japan, 980-8577 Graduate School of Engineering Tohoku University Sendai, Japan, 980-8577
国际会议
The Ninth Asian Thermophysical Properties Conference(第九届亚洲热物理性能会议 ATPC 2010)
北京
英文
898-903
2010-10-19(万方平台首次上网日期,不代表论文的发表时间)