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A Phenomenon of the Change in Particle Drift Velocity Direction in High-Field Electrophoresis

✍ Scribed by P.V. Pikhitsa; A.B. Tsargorodskaya; S.M. Kontush

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 82 KB
Volume: 230
Category: Article
ISSN: 0021-9797
DOI: 10.1006/jcis.2000.7048

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✦ Synopsis

The sign-alternating electric field in rectangular impulses has been used to eliminate linear electrophoresis and to study nonlinear electrophoresis in water at strong fields. We found out that the particle drift velocity could change its direction with the growth of the strength of the field. This new phenomenon has obtained its explanation in the framework of the Debye-H ückel theory of strong electrolyte where we consider a particle as a "heavy" effective ion and take into account all relevant nonlinear effects, grounding ourselves on basic physics. With the help of our theory we have succeeded in good fitting of our experimental data on black oil and Al 2 O 3 particles in distilled water using reasonable values for the basic parameters such as the Debye screening length.

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