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Issue 2, 2009
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Magnetic susceptibility measurement of a microdroplet interface using a magnetic circuit

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Abstract

A conventional method to measure the magnetic susceptibility of a microdroplet in a glass capillary has been constructed by using a magnetic circuit (2.82 T) with a high magnetic field gradient (B(dB/dz) = 3900 T2/m). The magnetophoretic velocity of a toluene droplet with ferrocene dispersed in 1 M HCl aqueous solution including K3[Fe(III)(CN)6], Fe(III)Cl3 and cetyltrimethylammonium bromide (CTAB) was measured and the volume magnetic susceptibility of droplets was determined. From the dependence of the magnetic susceptibility on the radius of the droplets, the interfacial magnetic susceptibility of the droplets adsorbed by Prussian blue aggregates was determined. The interfacial concentration of Prussian blue of individual droplet calculated from the observed magnetic susceptibility indicated that the interfacial concentration of Prussian blue are different even in similar sized droplets, suggesting inhomogeneous formation of interfacial aggregates.

Graphical abstract: Magnetic susceptibility measurement of a microdroplet interface using a magnetic circuit

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Publication details

The article was received on 12 May 2008, accepted on 23 Sep 2008 and first published on 29 Oct 2008


Article type: Paper
DOI: 10.1039/B808042A
Analyst, 2009,134, 278-282

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    Magnetic susceptibility measurement of a microdroplet interface using a magnetic circuit

    S. Egami and H. Watarai, Analyst, 2009, 134, 278
    DOI: 10.1039/B808042A

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