Iontronic Neuromorphic Signaling with Conical Microfluidic Memristors

Experiments have shown that the conductance of conical channels, filled with an aqueous electrolyte, can strongly depend on history applied voltage. These channels hence a memory and are promising elements in brain-inspired (iontronic) circuits. We show here such stems from transient concentration polarization over ionic diffusion time. derive analytic approximation for these dynamics which shows good agreement full finite-element calculations. Using our approximation, we propose experimentally realizable Hodgkin-Huxley iontronic circuit where micrometer cones take role sodium potassium channels. Our proposed exhibits key features neuronal communication as all-or-none action potentials upon pulse stimulus spike train sustained stimulus.