  A hitherto unexploited characteristic feature of emerging iontronic devices
for information processing is the intrinsic mobility of the medium (water) of
dissolved ions in aqueous electrolytes, which therefore not only respond to
voltage but also to pressure. Here we study a microfluidic memristor, in the
form of a conical channel, exposed to simultaneously applied time-dependent
voltage and pressure drops, through numerical solutions of the
Poisson-Nernst-Planck-Stokes equations for ion and fluid transport. We show
that the channel's memristive properties can be enhanced, reduced or
instantaneously reset by a suitable pressure, and we leverage this finding with
two examples of time series processing of simultaneously applied voltage and
pressure pulses. We not only show that the distinction between different
voltage time series can be improved by enhancing the conductance response with
corresponding pressure pulses, but also that the bandwidth of information
transfer through the channel can be doubled by letting the pressure pulses
represent a second independent time series.
