Chemically Regulated Conical Channel Synapse for Neuromorphic and Sensing Applications

Fluidic iontronics offer a unique capability for emulating the chemical processes found in neurons. We extract multiple distinct chemically regulated synaptic features from a single conical microfluidic channel carrying functionalized surface groups, using finite-element calculations of continuum tr...

Full description

Saved in:
Bibliographic Details
Published inarXiv.org
Main Authors Kamsma, T M, Klop, M S, Boon, W Q, Spitoni, C, Rueckauer, B, R van Roij
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 05.06.2024
Subjects
Charging
Chemical reactions
First principles
Logic circuits
Nonlinear dynamics
Surface charge
Surface reactions
Synapses
Transport equations
Online AccessGet full text

Cover

More Information
Summary:Fluidic iontronics offer a unique capability for emulating the chemical processes found in neurons. We extract multiple distinct chemically regulated synaptic features from a single conical microfluidic channel carrying functionalized surface groups, using finite-element calculations of continuum transport equations. Such channels have long been employed for fluidic sensing and are therefore experimentally well established. By modeling a Langmuir-type surface reaction on the channel wall we couple fast voltage-induced volumetric salt accumulation with a long-term channel surface charge modulation by means of fast charging and slow discharging. These nonlinear charging dynamics are understood through an analytic approximation rooted in first-principles. We show how short-and long-term potentiation and depression, frequency-dependent plasticity, and chemical-electrical signal coincidence detection (acting like a chemical-electrical AND logic gate), akin to the NMDA mechanism for Hebbian learning in biological synapses, can all be emulated with a single channel.
ISSN:2331-8422