| 초록 |
The properties of colloid-assembled materials on a macroscale can be predicted from interactions between individual particles on a microscale. However, the prediction can be deviated due to heterogeneity in interparticle interactions. When colloidal particles reside at a fluid-fluid interface (i.e., oil-water interface), the particles exhibit abnormally strong electrostatic repulsions, compared to the case when they are immersed in a single fluid medium (i.e., water). The strong electrostatic interactions can be attributed to dipole-dipole interactions that decay as r-4, where r is the center-to-center separation between the particles. In this work, we quantitatively investigate the interaction heterogeneity of various types of colloidal particles at the oil-water interface using optical laser tweezers |
