  We determine the capillary attraction and equilibrium configurations of
particles trapped at a liquid-fluid interface due to the pinning of their
contact-line. We calculate analytically the asymptotic interaction energy
between two particles and, numerically, the multi-body energy landscape for up
to four contacting particles. Our results are consistent with recent
experiments. We show that a system composed of a large number of such particles
behaves as a jammed system.
