Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1162, Issue 2, Pages 180-186Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2007.06.032
Keywords
microextraction; aqueous two-phase system (ATPS); electrohydrodynamic instability; droplet generation
Funding
- Ministry of Education, Science & Technology (MoST), Republic of Korea [kaist36] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [R11-2001-089-05002-0, R01-2004-000-10681-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Microextraction of methyl orange in the aqueous two-phase system (ATPS) formed by dissolving tetrabutyl ammonium bromide (TBAB) and ammonium sulfate (AS) is reported. Methyl orange was transported from the AS-rich phase to TBAB-rich phase across the interface of the two immiscible phases. The electrohydrodynamic effect on the shape of the interface of two immiscible flows was also observed by applying dc voltage at the T-junction of the microchannel and the generation of a droplet of AS-rich phase was observed when the potential difference between positive and negative electrodes exceeds a threshold voltage. The minimum voltage necessary for the droplet generation depends on pH due to the degree of dissociation and charge accumulation. (c) 2007 Elsevier B.V. All rights reserved.
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