10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
Abstract View
Magnetic Nanoparticle Chain Formation in a Combined Electric and Magnetic Field
CALLE PREGER, Knut Deppert, Maria E Messing, Lund University
Abstract Number: 1201 Working Group: Materials Synthesis
Abstract Magnetic nanoparticles have been widely studied due to its many interesting properties and for their potential use as magnetic memory device and in medical diagnostic. Aerosol technologies provides a good mean to produce magnetic nanoparticles and the spark discharge generation of engineered nanoparticles enables formation of complex alloys with controlled size and concentration in a broad size range without agglomeration. The nanoparticles are typically deposited onto a substrate by using an electrostatic precipitator (ESP) and as the concentration of particles on the substrate increases random clusters are formed.
In this study, magnetic nanoparticles have been generated by spark discharge and the clusters formation on the substrate has been studied after the nanoparticles have been exposed to a magnetic field. We will show that it is possible to assemble individual nanoparticles into chains of magnetic nanoparticles in the presence of a magnetic field. The sparsely spaced nanoparticles are exposed to a magnetic field in the aerosol flow, the particles attract and collide and form chains of particles enabling formation of structures not possible with an electrostatic precipitator (ESP) alone. We will show the combined effect on magnetic nanoparticles from a magnetic field prior to deposition and from an electric field at deposition. This enables standing chains of nanoparticles and in some cases arcs of nanoparticles. By varying the strength of the magnetic field, the time the particles are exposed to the magnetic field, the concentration of particles in the gas flow and the size of the particles differently sized chains and shapes are formed and deposited on the substrate.