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Magnetic measurements of suspended functionalised ferromagnetic beads under DC applied fields
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Santos, Luis V. de los, Llandro, Justin, Lee, Dongwook, Mitrelias, Thanos, Palfreyman, Justin J., Hayward, Thomas J., Cooper, Jos, Bland, J. A. C., Barnes, Crispin H. W., Arroyo C., Juan L. and Lees, Martin R. (2009) Magnetic measurements of suspended functionalised ferromagnetic beads under DC applied fields. Journal of Magnetism and Magnetic Materials, Vol.321 (No.14). pp. 2129-2134. doi:10.1016/j.jmmm.2009.01.019 ISSN 0304-8853.
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Official URL: http://dx.doi.org/10.1016/j.jmmm.2009.01.019
Abstract
In this work, a simple technique to obtain the hysteresis loops of magnetic beads (Spherotech Inc.) in liquid suspension is presented. The magnetic measurements were taken in a DC Magnetic Property Measurement System (MPMS-SQUID sensor). Samples were based on ferromagnetic beads (surface-functionalized NH2, mean diameter 4.32 mu m) prepared in three conditions: dry, suspended in sucrose solution and in suspension after functionalization with fluorophore. Special small containers (1.3 cm long) made of non magnetic plastic were designed to hold the beads in liquid. The results indicate that the bead's remnant magnetization is half of the value at maximum applied field in all cases. However, due to the additional degrees of rotational freedom, beads suspended in a liquid do not present coercivity. The use of ferromagnetic beads and magnetic elements of different architectures for applications in bioassays is also discussed. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
Item Type: | Journal Article | ||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) Q Science > QC Physics |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Journal of Magnetism and Magnetic Materials | ||||
Publisher: | Elsevier Science BV | ||||
ISSN: | 0304-8853 | ||||
Official Date: | July 2009 | ||||
Dates: |
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Volume: | Vol.321 | ||||
Number: | No.14 | ||||
Number of Pages: | 6 | ||||
Page Range: | pp. 2129-2134 | ||||
DOI: | 10.1016/j.jmmm.2009.01.019 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | European Union Programme of High Level Scholarships for Latin America, Cambridge Overseas Trust | ||||
Grant number: | E06D101257PE |
Data sourced from Thomson Reuters' Web of Knowledge
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