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  • Electromagnetophoretic migration velocity of organic microdroplets with surfactants using permanent magnets.

Electromagnetophoretic migration velocity of organic microdroplets with surfactants using permanent magnets.

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry (2013-01-11)
Yoshinori Iiguni, Hajime Ohtani
ABSTRACT

By using the electromagnetophoretic migration technique with permanent magnets, the electromagnetophoretic migration velocimetry in a droplet-based system was demonstrated for organic droplets dispersed in an aqueous solution. Migration of 2-fluorotoluene droplets with a diameter of 8 - 16 μm dispersed in 1.0 M KCl aqueous solution could be achieved in the same manner as for solid particles. The effect of cetyltrimethylammonium bromide (CTAB) on the electromagnetophoretic migration velocity of the droplets was also investigated. When the concentration of CTAB was in the range from 10(-6) to 10(-4) M, the electromagnetophoretic migration velocity of 2-fluorotoluene droplets decreased as the concentration of CTAB increased. With this measurement, we could successfully characterize organic droplets in terms of the amount of adsorbing surfactants by evaluating the surface conductivity of organic droplets calculated based on their electromagnetophoretic migration velocity.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Cetyltrimethylammonium hydrogensulfate, 99%
Sigma-Aldrich
Hexadecyltrimethylammonium chloride, ≥98.0% (NT)
Sigma-Aldrich
Hexadecyltrimethylammonium hydroxide solution, ~25% in methanol (T)
Sigma-Aldrich
Cetyltrimethylammonium chloride solution, 25 wt. % in H2O
Sigma-Aldrich
Hexadecyltrimethylammonium hydroxide solution, 10 wt. % in H2O
Supelco
Hexadecyltrimethylammonium bromide, analytical standard
Supelco
Hexadecyltrimethylammonium bromide, suitable for ion pair chromatography, LiChropur
Sigma-Aldrich
Hexadecyltrimethylammonium bromide, BioUltra, for molecular biology, ≥99.0% (AT)
Supelco
Hexadecyltrimethylammonium bisulfate, suitable for ion pair chromatography, LiChropur, ≥99.0% (T)
Sigma-Aldrich
Hexadecyltrimethylammonium bromide, ≥98%
Sigma-Aldrich
Hexadecyltrimethylammonium bromide, BioXtra, ≥99%
Sigma-Aldrich
Hexadecyltrimethylammonium bromide, for molecular biology, ≥99%
Sigma-Aldrich
Hexadecyltrimethylammonium bromide, ≥96.0% (AT)