A Solid State Nanopore Device for Investigating the Magnetic Properties of Magnetic Nanoparticles

SangYoon Park,Yoon-Kyu Song,Jaekwan Lim,Y. Pak,Seunghyun Moon

doi:10.3390/s130606900

Abstract

In this study, we explored magnetic nanoparticles translocating through a nanopore in the presence of an inhomogeneous magnetic field. By detecting the ionic current blockade signals with a silicon nitride nanopore, we found that the translocation velocity that is driven by magnetic and hydrodynamic forces on a single magnetic nanoparticle can be accurately determined and is linearly proportional to the magnetization of the magnetic nanoparticle. Thus, we obtained the magneto-susceptibility of an individual nanoparticle and the average susceptibility over one hundred particles within a few minutes.

Highlights

The most important issue for magnetic materials is an understanding of the magnetic and physical properties of a nanometer-sized particle because the use of magnetic nanoparticles (MNPs) in many applications depends predominantly on their inherent magnetic properties
We found that the magnetic force enables the MNPs to move more rapidly and that the velocity is linearly proportional to the magnetization of a MNP
We have investigated the properties of magnetic nanoparticles translocating through a solid-state nanopore in the presence of an inhomogeneous magnetic field

Summary

Introduction

The most important issue for magnetic materials is an understanding of the magnetic and physical properties of a nanometer-sized particle because the use of magnetic nanoparticles (MNPs) in many applications depends predominantly on their inherent magnetic properties. The size and surface charge state of a nanoparticle can be routinely characterized by dynamic light scattering (DLS) and zeta-potentiometry, respectively. These methods can provide information on the distributions and the average values of the size and charge number of each particle. Unlike DLS and zeta-potentiometry, these techniques, they have excellent sensitivities, are limited to the average properties of a large number of MNPs. To the best of our knowledge, the resultant data from these techniques do not provide sufficient information on the magnetism of a MNP, which may be considered as a critical bottleneck in facilitating the use of MNPs in various industrial applications

Methods

Results

Conclusion