| 초록 |
We firstly report measurements of intrinsic potentials of negatively charged colloidal particles dispersed on a centrosymmetrically curved oil-water interface. The electrostatic repulsions between the particles are balanced with geometric confinements, resulting in unique colloidal assembly structures. To measure the intrinsic potentials of three particles (a1, a2, a3) based on this phenomenon, for instance, three independent conditions should be required. One condition is the pair interaction magnitude (a12) between particle-1 and -2 in the presence of the two particles at the interface. Another condition can be determined by positions of the three particles (r1, r2, and r3) that tend to form a triangular structure upon adding the third particle to the interface. The other condition should correspond to the minimum energy state of the triangular structure (Emin). Consequently, the three unknown variables (a1, a2, a3) of the intrinsic potentials can be obtained by the three independent conditions. This approach for determining the intrinsic potentials can directly provide relation with dipole strength of individual particles when they are dispersed at fluid–fluid interfaces. |
