  By reinforcing the interaction energy of the liquid with respect to the
surface using total wetting boundary conditions, the response of liquids to
mechanical shear stress is stronger and exhibits at sub-millimeter scale
elastic properties. This study extends here to liquids with strong
electrostatic interactions such as ionic liquids and paramagnetic liquids. We
show that it is also possible to identify and measure a non-zero low-frequency
shear elasticity at sub-millimeter scale. The observation of mesoscopic elastic
properties in liquids generally considered as viscous away from any phase
transition and the absence of extended structuring confirm the relevance of
considering elastic interactions as contributing to collective effects under
external electric or magnetic field.
