Preparation of monodisperse and highly coercive L10-FePt nanoparticles dispersible in nonpolar organic solvents

Shinpei Yamamoto; Yasumasa Morimoto; Yoshinori Tamada; Y. K. Takahashi; K. Hono; Teruo Ono; Mikio Takano

doi:10.1021/cm0616634

Preparation of monodisperse and highly coercive L1₀-FePt nanoparticles dispersible in nonpolar organic solvents

Shinpei Yamamoto, Yasumasa Morimoto, Yoshinori Tamada, Y. K. Takahashi, K. Hono, Teruo Ono, Mikio Takano

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

Abstract

A method to prepare monodisperse and highly coercive L1₀-FePt nanoparticles that are dispersible in nonpolar organic solvents such as toluene, chloroform, and hexane was developed. By vigorously stirring the SiO ₂-coated L1₀-FePt nanoparticles synthesized by the "SiO₂-nanoreactor" method (Appl. Phys. Lett. 2005, 87, 032503) in a mixture of an aqueous NaOH solution, chloroform, and hexadecyltrimethlyammonium bromide, the SiO₂ coating was dissolved off, and bare FePt nanoparticles could be extracted to the chloroform phase without degrading their magnetic properties. These particles showed a tendency to form a close-packed lattice on slow drying of the chloroform-based solution. The present success may promote the practical application to ultra-high-density magnetic recording and also may open the door to providing these particles with new physical and/or chemical functions.

Original language	English
Pages (from-to)	5385-5388
Number of pages	4
Journal	Chemistry of Materials
Volume	18
Issue number	22
DOIs	https://doi.org/10.1021/cm0616634
Publication status	Published - 2006 Oct 31
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Materials Chemistry

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10.1021/cm0616634

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abstract = "A method to prepare monodisperse and highly coercive L10-FePt nanoparticles that are dispersible in nonpolar organic solvents such as toluene, chloroform, and hexane was developed. By vigorously stirring the SiO 2-coated L10-FePt nanoparticles synthesized by the {"}SiO2-nanoreactor{"} method (Appl. Phys. Lett. 2005, 87, 032503) in a mixture of an aqueous NaOH solution, chloroform, and hexadecyltrimethlyammonium bromide, the SiO2 coating was dissolved off, and bare FePt nanoparticles could be extracted to the chloroform phase without degrading their magnetic properties. These particles showed a tendency to form a close-packed lattice on slow drying of the chloroform-based solution. The present success may promote the practical application to ultra-high-density magnetic recording and also may open the door to providing these particles with new physical and/or chemical functions.",

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AU - Yamamoto, Shinpei

AU - Morimoto, Yasumasa

AU - Tamada, Yoshinori

AU - Takahashi, Y. K.

AU - Hono, K.

AU - Ono, Teruo

AU - Takano, Mikio

PY - 2006/10/31

Y1 - 2006/10/31

N2 - A method to prepare monodisperse and highly coercive L10-FePt nanoparticles that are dispersible in nonpolar organic solvents such as toluene, chloroform, and hexane was developed. By vigorously stirring the SiO 2-coated L10-FePt nanoparticles synthesized by the "SiO2-nanoreactor" method (Appl. Phys. Lett. 2005, 87, 032503) in a mixture of an aqueous NaOH solution, chloroform, and hexadecyltrimethlyammonium bromide, the SiO2 coating was dissolved off, and bare FePt nanoparticles could be extracted to the chloroform phase without degrading their magnetic properties. These particles showed a tendency to form a close-packed lattice on slow drying of the chloroform-based solution. The present success may promote the practical application to ultra-high-density magnetic recording and also may open the door to providing these particles with new physical and/or chemical functions.

AB - A method to prepare monodisperse and highly coercive L10-FePt nanoparticles that are dispersible in nonpolar organic solvents such as toluene, chloroform, and hexane was developed. By vigorously stirring the SiO 2-coated L10-FePt nanoparticles synthesized by the "SiO2-nanoreactor" method (Appl. Phys. Lett. 2005, 87, 032503) in a mixture of an aqueous NaOH solution, chloroform, and hexadecyltrimethlyammonium bromide, the SiO2 coating was dissolved off, and bare FePt nanoparticles could be extracted to the chloroform phase without degrading their magnetic properties. These particles showed a tendency to form a close-packed lattice on slow drying of the chloroform-based solution. The present success may promote the practical application to ultra-high-density magnetic recording and also may open the door to providing these particles with new physical and/or chemical functions.

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Preparation of monodisperse and highly coercive L1₀-FePt nanoparticles dispersible in nonpolar organic solvents

Abstract

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