Magnetic Nanoparticle Based Molecular Communication in Microfluidic Environments

TL;DR

This paper presents a theoretical analysis of magnetic nanoparticles in microfluidic molecular communication, demonstrating how magnetic fields can enhance particle control and communication reliability amidst fluid flow.

Contribution

It introduces a mathematical model for magnetic nanoparticle transport in microfluidic channels and derives an analytical channel impulse response considering magnetic forces.

Findings

Magnetic field parameters significantly influence particle transport.

Analytical expressions accurately predict particle behavior validated by simulations.

Magnetic nanoparticles improve communication reliability in flowing fluids.

Abstract

The possibility to guide and control magnetic nanoparticles in a non-invasive manner has spawned various applications in biotechnology such as targeted drug delivery and sensing of biological substances. These applications are facilitated by the engineering of the size, selective chemical reactivity, and general chemical composition of the employed particles. Motivated by their widespread use and favorable properties, in this paper, we provide a theoretical study of the potential benefits of magnetic nanoparticles for the design of molecular communication systems. In particular, we consider magnetic nanoparticle based communication in a microfluidic channel where an external magnetic field is employed to attract the information-carrying particles to the receiver. We show that the particle transport affected by Brownian motion, fluid flow, and an external magnetic field can be mathematically modeled as diffusion with drift. Thereby, we reveal that the key parameters determining the magnetic force are the particle size and the magnetic field gradient. Moreover, we derive an analytical expression for the channel impulse response, which is used to evaluate the potential gain in the expected number of observed nanoparticles due to the magnetic field. Furthermore, adopting the symbol error rate as performance metric, we show that using magnetic nanoparticles can enable reliable communication in the presence of disruptive fluid flow. Numerical results obtained by particle-based simulation validate the accuracy of the derived analytical expressions.