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Magnetic microbead transport during resistive pulse sensing.

Geoff R Willmott¹, Matthew G Fisk², James Eldridge³

¹The MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, Wellington, New Zealand ; Callaghan Innovation, 69 Gracefield Rd., Lower Hutt, New Zealand.

Biomicrofluidics

|January 8, 2014

Summary

Tunable resistive pulse sensing (TRPS) quantifies superparamagnetic bead motion. Theory reveals pressure-driven flow dominates near pores, while magnetic forces are key further away.

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Area of Science:

Physics
Nanotechnology
Biotechnology

Background:

Tunable resistive pulse sensing (TRPS) is a technique for analyzing particle behavior.
Superparamagnetic beads are widely used in biotechnology and sensing applications.
Understanding particle transport mechanisms is crucial for optimizing sensing applications.

Purpose of the Study:

To quantitatively study the motion of 1 μm superparamagnetic beads using TRPS in a variable magnetic field.
To develop and validate a closed-form theory for interpreting TRPS experiments involving magnetic beads.
To investigate the interplay of various transport mechanisms (pressure, electrophoresis, magnetism) influencing particle motion in and near a conical pore.

Main Methods:

Performed tunable resistive pulse sensing (TRPS) experiments with 1 μm superparamagnetic beads.
Developed a closed-form theoretical model incorporating six particle transport mechanisms.
Varied magnetic field strength and position relative to a conical pore.
Analyzed resistive pulse characteristics (rate and duration) to infer particle behavior.

Main Results:

Calculations indicated pressure-driven flow dominates over electrophoresis and magnetism near the pore constriction (~100x).
Magnetic force is predicted to dominate particle transport beyond ~1 mm from the membrane.
Observed a decrease in resistive pulse rate as the magnet approached the pore.
Increased pulse duration suggested the importance of particle trajectories near the pore opening.
No aggregation was observed, attributed to high hydrodynamic shear and bead magnetization.

Conclusions:

TRPS is a versatile sensing method for studying magnetic particle dynamics.
The developed theoretical framework accurately interprets TRPS experiments and predicts transport mechanisms under various conditions.
The findings provide insights into optimizing magnetic bead-based applications in biotechnology and sensing.