Analytical Sciences

Zero-velocity Magnetophoretic Method for the Determination of Particle Magnetic Susceptibility

Hitoshi WATARAI,*1 Hoang Trong Tien DUC,*2 Tran Thi Ngoc LAN,*2 Tianyi ZHANG,*3 and Satoshi TSUKAHARA*4

*1 Institute for NanoScience Design, Osaka University, Toyonaka, Osaka 560-8531, Japan
*2 Applied Physical Chemistry Laboratory, Chemistry Department, University of Science, Ho Chi Minh City, Vietnam
*3 School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
*4 Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan

A simple zero-velocity method to determine the particle magnetic susceptibility by measuring the magnetophoretic velocity was proposed. The principle is that the magnetophoretic velocity of a particle in a liquid medium must be zero when the magnetic susceptibilities of the medium and the particle are equal, or the gravity force and the magnetophoretic force are balanced. By changing the medium magnetic susceptibility and measuring the magnetophoretic velocity of a particle, the particle magnetic susceptibility was determined from the medium magnetic susceptibility under the zero-velocity condition. The feasibility of the method was demonstrated for polystyrene particles using a Dy(III) solution in the horizontal migration mode and different organic solvents in the vertical migration mode.

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