Quantitative evaluation method of being distributed the zeta-potential in wall surface, quantitative visualization manner of the device, and surface qualification pattern, the device

摘要

A first and a second fluorescent dye are mixed into a solution and the first dye being positively ionized in the solution and the second dye being negatively ionized in the solution and having different fluorescence wavelengths from the first dye. The solution is flown onto a measured surface and the surface is excited with an evanescent wave to produce a fluorescence intensity distribution of two colors. A fluorescence intensity of the surface is measured using a two-dimensional imaging element, the element providing a fluorescence intensity of each color separated from the other colors and thereby calculating a ratio of the fluorescence intensities of the colors. Using an equation expressing a relationship between the ratio of fluorescence intensities and a wall zeta potential and the ratio is converted to a two-dimensional distribution of wall zeta potentials. This achieves visualizing in real time and quantitatively evaluating the two-dimensional distribution of wall zeta potentials and surface modifications.