  Bubbles made of smectic liquid crystals (LC) can display buckling and
wrinkling. These deformations are induced in the course of the relaxation of an
elongated bubble towards a sphere. The bubbles are created through the collapse
of a catenoid LC film. Two mechanisms leading to wrinkles are reported: (a)
Compression of the smectic film by outer forces, and (b) Invagination of the
bubble shortly after formation. The flow on the bubble surface is analyzed,
providing insight into how the outer forces act on the bubble and induce local
surface deformation. It is found that the orientation of the wrinkles depends
on the direction of the acting force. The wavelength of the wrinkles is
analyzed over time. Additionally, the formation of small protrusions outside
the film area (i.e., tubuli) is described.
