| 초록 |
The properties of colloid-assembled crystalline structures on macroscales can be predicted from microscales interaction. However, the prediction can be deviated due to heterogeneity of interparticle interactions. When colloidal particles reside at an interface, the particles exhibit strong electrostatic repulsions, compared to the case when they are immersed in a single fluid(i.e., water). Note that the strong electrostatics are due to the dipole-dipole interactions that decay as r-4, where r is the separation between the particles. The electrostatic repulsive interactions lead to the formation of colloidal crystalline structures, whereas the presence of interaction heterogeneity tends to melt the ordered configurations. In this work, we employ the optical laser tweezers to quantitatively investigate the interaction heterogeneities of microspheres with various surface functionalities and their effects on the formation of assembled crystalline structures at an oil-water interface. |
