Exact phoretic interaction of two chemically-active particles
Motion of two chemically-active particles due to their phoretic interactions. Depending on their physico-chemical properties, the particles can come together and make a complex (regime I), move away and separate (regime II), reach a stable equilibrium at a certain gap size (regime III), or develop a critical gap size above which they move apart and below which they aggregate (regime IV). In each regime, two pairs of particles with identical properties are shown. The motion of the pair on top is governed by the exact solution, while for the bottom pair the far-field approach is used.