Research in line with the pioneer work of Pickering succeeded recently to produce new objects which can be described as gas pockets in air and named gas marbles.
They are made of gas surrounded by a layer of grains constrained by thin liquid film in gas environment.
The exceptional mechanical strength of their granular shell promise them to many applications.
Among these, we note here that using gas marbles can be relevant for the generation of materials with hierarchical porosity.
Moreover, these new hollow marbles offer a promising route to new vibration dampers.
Figure 1: side view of a gas marble (particles diameter = 250 µm). b and c are sketches of the granular shell at the particle scale.