Abstract
A prototype magnetic levitation (maglev) system for feeding, holding and conveying ferrofluids successfully levitated a ferrofluid droplet with feedback control in the air at room temperature. This maglev system consists of a rod-shaped electromagnet, a displacement sensor, an oil-repellent film, a sample stage, and peripheral control devices. The levitated droplet has a mass of 15 mg and a viscosity of 5,000 mPa.sec. The pure deformation and behavior of the droplet in the process from the control start to the stable levitation state were investigated in detail using a high-speed camera. The magnetically levitated droplet behaved very fast as well as a common solid object. The droplet finally stabilized in a bottom-swollen egg shape in mid-air. The technique of magnetically levitating one droplet will lead to developing a manipulator system for ferrofluids.
Highlights
Manipulating ferrofluids at will is a very significant theme in both academic and industrial aspects
This paper focuses on the holding of ferrofluid droplets by a magnetic field
Many experimental attempts have been reported to verify the theory of ferrofluid droplet deformation1–4 due to an external magnetic field
Summary
Manipulating ferrofluids at will is a very significant theme in both academic and industrial aspects. Droplet deformation under a negligibly small normal force was discussed by applying a horizontal magnetic field to a droplet placed on a horizontal plane.. Droplet deformation under a negligibly small normal force was discussed by applying a horizontal magnetic field to a droplet placed on a horizontal plane.5,6 In another method, the deformation by an external magnetic field was evaluated under the condition that the ferrofluid injected into the immiscible liquid receives the buoyancy.. As an essential problem, these experimental methods involve the external force which hinders pure deformation and behavior of the droplet. Active magnetic levitation (Maglev) control of ferrofluids filled in a capsule has been reported.. This paper reports that a prototype maglev system for feeding, holding and conveying ferrofluids levitated a ferrofluid droplet successfully with feedback control in the air at room temperature. The pure deformation and behavior of the droplet in the process from the control start to the stable levitation are investigated in this paper
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