| 초록 |
When colloidal particles with surface functional groups reside at a fluid-fluid interface composed of polar and non-polar fluids, asymmetric surface charge dissociation across the interface creates an electric permanent dipole approximately perpendicular to the interface. The electrostatic dipolar repulsion between the particles at the interface can be described by the point dipole interaction model. The fact that a permanent dipole produces an induced dipole at a molecular level is well documented in many textbooks, whereas experimental studies on permanent dipole-induced dipole interactions on a colloidal scale have not yet been demonstrated. In this work, we develop an experimental protocol, in which like-charged colloidal particles exhibit dipole-induced dipole interactions, and quantitatively measure these interactions using optical laser tweezers. |
