抄録
Offer Organization: Japan Society for the Promotion of Science, System Name: Grants-in-Aid for Scientific Research, Category: Grant-in-Aid for Scientific Research (B), Fund Type: -, Overall Grant Amount: - (direct: 10800000, indirect: 3240000)
Reaction-diffusion phenomena of aqueous solutions in microfluidic channels were visualized by using a near-infrared-based technique for simultaneous imaging of temperature and concentration. Variations in concentration distributions at the interface between two aqueous solutions were used to determine the diffusion coefficient and its temperature dependence of each solution. Regarding aqueous solutions of acid and alkali, the concentration distributions of reactive substances and salt generated by neutralization were simultaneously obtained. Furthermore, the effects of chemical reaction and diffusion on the instability of the interface, especially on the onset time of convection, were investigated. The results obtained in this study indicate the utility of the imaging technique and the feasibility of quantitative analysis of reaction-diffusion fronts.