High-Density Assembly of Micro-Dispersoids by Laser-Induced Bubble and Fluid Flow

摘要

A laser-induced micro-bubble and fluid flow can assemble dispersoids locally and rapidly by CW laser illumination to light absorptive materials in a suspension. However, the control method of such a process hasn't been well established. In this study, we tried to construct a quantitative analysis method based on the projection area of the assembled dispersoids and to clarify the factors for the control of the laser-induced assembly. As a result, it was clarified that adsorption of the amphiphile onto gas-liquid interface of the bubble/suspension plays an important role for the controllability. Particularly, we found that there is a high correlation between the projection area of the assembled dispersoids and its concentration under the controlled assembly. These findings are crucial not only for the control of the laser-induced assembly but also for the rapid concentration measurement techniques.