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Production Of CoPt Alloy Grains Within Protein Templates

Published online by Cambridge University Press:  11 February 2011

Barnaby Warne  and
Eric L. Mayes
Barnaby Warne
Affiliation:
Research chemist, NanoMagnetics Ltd., 108 Longmead Road, Emersons Green, Bristol, BS16 7FG, United Kingdom Tel: +44 1179 104160, Fax: +44 1179 104161, E-mail: [email protected]
Eric L. Mayes
Affiliation:
Research chemist, NanoMagnetics Ltd., 108 Longmead Road, Emersons Green, Bristol, BS16 7FG, United Kingdom Tel: +44 1179 104160, Fax: +44 1179 104161, E-mail: [email protected]
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Abstract

The spherical protein ferritin can be used as a generic reaction vessel for the production of a variety of materials, such as iron and manganese oxides. Here, its use for the aqueous production of nanoparticles of equiatomically alloyed CoPt is demonstrated. These have been considered for ultrahigh density magnetic recording as well as permanent magnetic materials. This monodisperse protein strictly regulates the maximum diameter of nanocrystals synthesized within its 8 nm diameter cavity. As a consequence of its external uniformity, it decouples the formation of highly regular self-patterned films from any size distribution associated with the synthesized material. Further, its 2 nm-thick protein coating discourages sintering of particles at temperatures required for the transformation to the L10 phase required for magnetic recording applications.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 735: Symposium C – Bioinspired Nanoscale Hybrid Systems , 2002 , C11.48
Copyright
Copyright © Materials Research Society 2003

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