コロイド粒子分散系液膜の乾燥過程における体積分率分布の測定

抄録

Drying of colloidal particle dispersion film is important for technical applications such as inkjet printing. There is a problem of the occurrence of cracks in drying process. One of the important factors related to this problem is the non-uniformity of volume fraction distribution in film, but, there is no efficient simple measurement method for it. In this study, we demonstrate a very simple technique to evaluate volume fraction during drying process of the liquid film. Red dye and nano-size particles disperse in the sample and measure the magnitude of the blue and the green components of the transmitting light. The transmittance ratio increases with increasing the volume fraction or decreasing the dye concentration. In dispersion film, not only volume fraction distribution also dye concentration distribution exists near the drying-front.