Soft Memristor at a Microbubble Interface

Memristors show promising features for neuromorphic computing.
Here we report a soft memristor based on the liquid–vapor surface
of a microbubble. The thickness of the liquid film was modulated by
electrostatic and interfacial forces, enabling resistance switches.
We found a pinched current hysteresis at scanning periods between
1.6 and 51.2 s, while representing a resistor below 1.6 s and a diode-like
behavior above 51.2 s. We approximate the thickening/thinning dynamics
of liquid film by pressure-driven flow at the interface and derived
the impacts of salt concentration and voltage amplitude on the memory
effects. Our work opens a new approach to building nanofluidic memristors
by a soft interface, which may be useful for new types of neuromorphic
computing in the future.