抄録
In biological, chemical, and medical analyses, the mechanism of particle motion at near-surface is greatly attracted attention for prediction of chemical characteristics such as reaction time and efficiency in micro chip. In this paper, we evaluated concentration distribution of polyethylene latex particle (diameter 100nm) motion at near-surface in micro-channel by total internal reflection fluorescence microscopy. And we investigate interaction forces (van der waals force, electrostatic force and lift force) between particle and wall. The results show the concentration is the lowest at near-surface and shows the largest value at specific location from wall. The location is consistent with theoretical particle-wall minimum potential location in static fluid. In flow field, the largest value location is far away from wall as increasing velocity. This impact is lower with high-ionic strength.
