  Soap bubbles are by essence fragile and ephemeral. Depending on their
composition and environment, bubble bursting can be triggered by
gravity-induced drainage and/or the evaporation of the liquid and/or the
presence of nuclei. In this paper, we design bubbles made of a composite liquid
shell able to neutralize all these effects and keep their integrity in a
standard atmosphere. This composite material is obtained in a simple way by
replacing surfactants by partially-wetting microparticles and water by a
water/glycerol mixture. A nonlinear model able to predict the evolution of
these composite bubbles toward an equilibrium state is proposed and
quantitatively compared to experimental data. This work unveils a composite
liquid film with unique robustness, which can easily be manufactured to design
complex objects.
