The Design of a Ferrofluid Magnetic Pipette

Greivell, N.E. and Hannaford, B. (1997) The Design of a Ferrofluid Magnetic Pipette. IEEE Transactions on Biomedical Engineering, 44 (3). pp. 129-135.

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Abstract

An electromagnetic pipet using a ferrofluid was designed to sample liquid volumes smaller than 0.2 microliter. Submicroliter sample sizes are desirable for reducing the amount of costly reagents and reducing sample requirement for large-scale analysis. The pipet consists of four electromagnets arranged such that air-gaps are aligned to accommodate a tube. A light-hydrocarbon-based ferrofluid is contained in the tube and acts as a plunger. The position of the ferrofluid in the tube was controlled to within 0.2 mm by combining adjacent air-gap magnetic fields. The position of the ferrofluid as a function of time and magnetic pressure as a function of position was measured in one electromagnet air-gap from the device. Maximum pressure measured was 770 Pascals which corresponds to a maximum velocity of 0.9 cm/s. The assembled pipet weighs approximately 25 grams and it measures 4 cm long, 1 cm wide, and 3 cm high.

Item Type: Article
Subjects: Z Other
Divisions: Department of Electrical Engineering
Depositing User: Brady Houston
Date Deposited: 14 Jul 2015 18:55
Last Modified: 14 Jul 2015 18:55
URI: http://brl.ee.washington.edu/eprints/id/eprint/195

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