Professor Kanghee-Ku aims to fabricate solid-liquid Janus colloids with controlled internal structures through phase separation in emulsions. The objective is to develop a model system capable 
of forming and detecting various liquid flows and vibrations, as indicated by changes in structural color, based on the photonic properties corresponding to the orientation angles within fluids.
 
This system operates by selectively reflecting specific wavelengths of light without using dyes, making it environmentally friendly, and also exhibits excellent color stability and reproducibility. Through the colloid's reflective color spectrometer, real-time quantification of fluid velocity is possible, enabling precise adjustment of photonic properties via surfactant and polymer design.
 
The particle fabrication technology proposed in this research is differentiated from existing methods, potentially bringing innovative changes to composite colloids composed of solid/liquid/gas mixtures. Furthermore, it resolves the limitations of existing systems that could not quantitatively visualize real-time fluid movement. This makes it an essential technology for precision fluid control systems required in biomedical research, environmental monitoring, and microfluidic engineering.