  Recently, using an Atomic Force Microscope and a single cantilever excited at
different frequencies it was shown that water nanomeniscus can exhibit a
transition in mechanical responses when submitted to stimuli above few tens of
kHz. The use of a single cantilever to explore phenomena at frequencies far
from the cantilever resonance frequency is not a common and well-established
strategy, and because water meniscus are ubiquitous in nature, we have also
studied the water meniscus mechanical response, the stiffness G' (N/m) and the
dissipation G"(kg/s), as a function of frequency by using cantilevers with
different resonance frequencies. These results, based on classic dynamical AFM
technics, confirm the anomalous mechanical response of water nanomeniscus when
stimulated at frequencies high enough.
