  The physicochemical hydrodynamics of bubbles and droplets out of equilibrium,
in particular with phase transitions, displays surprisingly rich and often
counterintuitive phenomena. Here we experimentally and theoretically study the
nucleation and early evolution of plasmonic bubbles in a binary liquid
consisting of water and ethanol. Remarkably, the submillimeter plasmonic bubble
is found to be periodically attracted to and repelled from the
nanoparticle-decorated substrate, with frequencies of around a few kHz. We
identify the competition between solutal and thermal Marangoni forces as origin
of the periodic bouncing. The former arises due to the selective vaporization
of ethanol at the substrate's side of the bubble, leading to a solutal
Marangoni flow towards the hot substrate, which pushes the bubble away. The
latter arises due to the temperature gradient across the bubble, leading to a
thermal Marangoni flow away from the substrate which sucks the bubble towards
it. We study the dependence of the frequency of the bouncing phenomenon from
the control parameters of the system, namely the ethanol fraction and the laser
power for the plasmonic heating. Our findings can be generalized to boiling and
electrolytically or catalytically generated bubbles in multicomponent liquids.
