Sensitive light-scattering detection-magnetophoretic acceleration mass analysis of single microparticles in an atmosphere

Analytical and Bioanalytical Chemistry
Mariko AraseHitoshi Watarai

Abstract

Optically detected magnetophoretic acceleration mass analysis of an individual micro-particle in an atmosphere has been remarkably improved in sensitivity by using a reflective microscope objective, by which forward scattered light from a particle could be effectively collected. From the light-scattering simulation, the detection limit for the radius of a micro-particle was estimated to be smaller than 0.4 μm, and about 60 times intensity enhancement was observed for a polystyrene particle with a radius of 2.8 μm. For both paramagnetic and diamagnetic micro-particles, the mass magnetic susceptibility and the relaxation time could be determined without knowing any parameters of the particles. From the relaxation time, the mass of a particle was obtained if the radius or the density of the particle was known. For a test sample silica particles were used to adsorb paramagnetic dysprosium(III), the surface concentration of dysprosium(III) on a single particle could be successfully determined by use of this method.

References

May 7, 2002·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·H Watarai, M Namba
Sep 19, 2002·Analytical Chemistry·Susanne C Moyer, Robert J Cotter
Oct 8, 2003·Applied Optics·Mark M WangPhilippe J Marchand
Nov 8, 2003·Journal of Chromatography. a·Masayori Suwa, Hitoshi Watarai
Apr 8, 2004·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Hitoshi WataraiYoshinori Iiguni
Jul 21, 2004·Chemical Communications : Chem Comm·Masayori Suwa, Hitoshi Watarai
Nov 30, 2004·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Katsuya WatanabeHitoshi Watarai
Dec 1, 2004·Langmuir : the ACS Journal of Surfaces and Colloids·Makiko TanakaHitoshi Watarai
Jan 28, 2006·Angewandte Chemie·Wen-Ping PengChung-Hsuan Chen
Sep 15, 2006·Analytical Chemistry·Mariko AraseHitoshi Watarai
Nov 7, 2006·Analytical and Bioanalytical Chemistry·Chensong PanHanfa Zou
Dec 30, 2006·Analytical Chemistry·Robert M LorenzDaniel T Chiu
Aug 21, 2007·Analytical Chemistry·Clemens HelmbrechtChristoph Haisch
Aug 29, 2007·Analytica Chimica Acta·Bum Suk ZhaoDoo Soo Chung
Nov 22, 2007·Lab on a Chip·Nicole Pamme

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Citations

Jun 19, 2013·Annual Review of Analytical Chemistry·Hitoshi Watarai
Mar 26, 2011·Analytica Chimica Acta·Masayori Suwa, Hitoshi Watarai

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