Electrocoalescence mechanisms of microdroplets using localized electric fields in microfluidic channels

Michele Zagnoni, Guillaume Le Lain, Jonathan M Cooper

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Electrocoalescence of water-in-oil microdroplets in microfluidic channels is an active technique that enables dropletbased mixing functionalities to be achieved in lab-on-a-chip applications. In this work, a characterization of the electrocoalescence mechanisms of water microdroplets in oil is presented, using localized electric field systems. We report a theoretical and experimental description of the electrocoalscence behavior of droplet pairs by varying the physical and fluid dynamic conditions of the phases. Our results demonstrate that localized electric field systems can be reliably used to merge droplets in pairs, regardless of the distance between the drops. The coalescence behavior was dependent upon the viscosity of the continuous phase for water droplets that were separated by a thick layer of oil and upon interfacial tension for droplets that were in close proximity. We showed that these systems have the potential to be used for highthroughput applications and that, unlike other examples of active systems in the literature, the need of droplet synchronization and the application of high voltages is considerably reduced.
Original languageEnglish
Pages (from-to)14443–14449
Number of pages7
JournalLangmuir
Volume26
Issue number18
DOIs
Publication statusPublished - 23 Aug 2010

Fingerprint

Microfluidics
oils
Electric fields
electric fields
water
Oils
fluid dynamics
coalescing
Water
proximity
high voltages
synchronism
interfacial tension
chips
viscosity
Lab-on-a-chip
Fluid dynamics
Coalescence
Surface tension
Synchronization

Keywords

  • electrocoalescence
  • microdroplets
  • lab-on-a-chip
  • fluid dynamic

Cite this

Zagnoni, Michele ; Le Lain, Guillaume ; Cooper, Jonathan M. / Electrocoalescence mechanisms of microdroplets using localized electric fields in microfluidic channels. In: Langmuir. 2010 ; Vol. 26, No. 18. pp. 14443–14449 .
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Electrocoalescence mechanisms of microdroplets using localized electric fields in microfluidic channels. / Zagnoni, Michele; Le Lain, Guillaume; Cooper, Jonathan M.

In: Langmuir, Vol. 26, No. 18, 23.08.2010, p. 14443–14449 .

Research output: Contribution to journalArticle

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AU - Le Lain, Guillaume

AU - Cooper, Jonathan M

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N2 - Electrocoalescence of water-in-oil microdroplets in microfluidic channels is an active technique that enables dropletbased mixing functionalities to be achieved in lab-on-a-chip applications. In this work, a characterization of the electrocoalescence mechanisms of water microdroplets in oil is presented, using localized electric field systems. We report a theoretical and experimental description of the electrocoalscence behavior of droplet pairs by varying the physical and fluid dynamic conditions of the phases. Our results demonstrate that localized electric field systems can be reliably used to merge droplets in pairs, regardless of the distance between the drops. The coalescence behavior was dependent upon the viscosity of the continuous phase for water droplets that were separated by a thick layer of oil and upon interfacial tension for droplets that were in close proximity. We showed that these systems have the potential to be used for highthroughput applications and that, unlike other examples of active systems in the literature, the need of droplet synchronization and the application of high voltages is considerably reduced.

AB - Electrocoalescence of water-in-oil microdroplets in microfluidic channels is an active technique that enables dropletbased mixing functionalities to be achieved in lab-on-a-chip applications. In this work, a characterization of the electrocoalescence mechanisms of water microdroplets in oil is presented, using localized electric field systems. We report a theoretical and experimental description of the electrocoalscence behavior of droplet pairs by varying the physical and fluid dynamic conditions of the phases. Our results demonstrate that localized electric field systems can be reliably used to merge droplets in pairs, regardless of the distance between the drops. The coalescence behavior was dependent upon the viscosity of the continuous phase for water droplets that were separated by a thick layer of oil and upon interfacial tension for droplets that were in close proximity. We showed that these systems have the potential to be used for highthroughput applications and that, unlike other examples of active systems in the literature, the need of droplet synchronization and the application of high voltages is considerably reduced.

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