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We investigate the evolution of a system of colloidal particles, trapped at afluid interface and interacting via capillary attraction, as function of therange of the capillary interaction and temperature. We address the collapse ofan initially homogeneous particle distribution and of a radially symmetric(disk--shaped) distribution of finite size, both theoretically by using aperturbative approach inspired by cosmological models and numerically by meansof Brownian dynamics (BD) and dynamical density functional theory (DDFT). Theresults are summarized in a "dynamical phase diagram", describing a smoothcrossover from collective (gravitational-like) collapse to local(spinodal-like) clustering. In this crossover region, the evolution exhibits apeculiar shock wave behavior at the outer rim of the contracting, disk-shapeddistribution.

Capillary attraction induced collapse of colloidal monolayers at fluid interfaces