Magnetic Susceptibility Measurement of Single Micro-Particle by Magnetophoretic Velocimetry

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  • Suwa Masayori
    Department of Chemistry, Graduate School of Science, Osaka University
  • Watarai Hitoshi
    Department of Chemistry, Graduate School of Science, Osaka University

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Other Title
  • 磁気泳動速度解析による単一微粒子の磁化率測定法の開発
  • ジキ エイドウ ソクド カイセキ ニ ヨル タンイツ ビリュウシ ノ ジカリツ ソクテイホウ ノ カイハツ

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Abstract

It has been highly required to analyze environmental or biological micro-particles noninvasively and nondestructively, since they have each characteristic function in the surface and inside the individual particle. Magnetophoretic velocimetry is a novel migration method, that allows us to measure the magnetic susceptibility of a single micro-particle, and can satisfy this requirement. A high magnetic field gradient generated by a superconducting magnet and a pair of pole pieces were used, in order to enhance the sensitivity of magnetophoretic velocimetry. The apparatus for observation of magnetophoresis in the gradient was constructed. The magnetic susceptibility of a micro-droplet adsorbed by a paramagnetic Dy(III) complex was measured, and reciprocally depended on the radius of the droplet. Dy(III) on the interface could be determined from this dependency. Furthermore, a photo-induced spin transition of single microcrystal of Co-Fe Prussian blue analogues could be observed from an abrupt increase of magnetophoretic velocity after pulse laser irradiation.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 59 (10), 895-902, 2010

    The Japan Society for Analytical Chemistry

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