Ferrohydrodynamic Microfluidics for Bioparticle Separation and Single-Cell Phenotyping: Principles, Applications, and Emerging Directions

TL;DR

Ferrohydrodynamic microfluidics uses magnetic field gradients in ferrofluids to manipulate and separate bioparticles and cells, enabling label-free phenotyping and advancing biomedical applications.

Contribution

This paper reviews recent advances in ferrofluid-based microfluidic platforms, highlighting physical principles, applications, and future directions in bioparticle separation and phenotyping.

Findings

High-resolution size-based bioparticle separation demonstrated

Subcellular bioparticle enrichment achieved

Discussion of challenges like biocompatibility and throughput

Abstract

Ferrohydrodynamic microfluidics relies on magnetic field gradients to manipulate diamagnetic particles in ferrofluid-filled microenvironments. It has emerged as a promising tool for label-free manipulation of bioparticles, including their separation and phenotyping. This perspective reviews recent progress in the development and applications of ferrofluid-based microfluidic platforms for multiscale bioparticle separation, ranging from micron-scale cells to submicron extracellular vesicles. We highlight the fundamental physical principles for ferrohydrodynamic manipulation, including the dominant magnetic buoyancy force resulting from the interaction of ferrofluids and particles. We then describe how these principles enable high-resolution size-based bioparticle separation, subcellular bioparticle enrichment, and phenotypic screening based on physical traits. We also discuss key challenges in ferrohydrodynamic microfluidics from the aspects of ferrofluid biocompatibility, system throughput, and nanoparticle depletion. Finally, we outline future research directions involving machine learning, 3D printing, and multiplexed detection. These insights chart a path for advancing ferrofluid-based technologies in precision biomedicine, diagnostics, and cellular engineering.