On-chip electrocoalescence of microdroplets as a function of voltage, frequency and droplet size
Zagnoni, Michele and Cooper, Jonathan M (2009) On-chip electrocoalescence of microdroplets as a function of voltage, frequency and droplet size. Lab on a Chip, 9 (18). pp. 2652-2658. ISSN 1473-0197 (https://doi.org/10.1039/b906298j)
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Electric fields have previously been used in microfluidic devices for the manipulation, sorting and mixing of microemulsions. Here, an active system for on-demand electrocoalescence of water droplets in oil is presented. The platform does not require precise electrode alignment nor droplet-droplet or droplet-electric field synchronisation. Droplets can be reliably merged in pairs at a rate up to 50 fusion events per second. The fusion mechanism is based on the balance between viscous, electric and interfacial stresses at the droplet interface and depends upon the flow behaviour in the microchannel. Experimental results show that, under different conditions of frequency, applied potential and size of the droplets with respect to the channel geometry, diverse types of droplet coalescence occur. The fusion mechanism and general trends which enabled different merging results are proposed. This system has potential for being applied and multiplexed for high throughput, emulsion-based applications in the field of combinatorial reactions and screening bioassays.
ORCID iDs
Zagnoni, Michele ORCID: https://orcid.org/0000-0003-3198-9491 and Cooper, Jonathan M;-
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Item type: Article ID code: 29027 Dates: DateEvent2009PublishedSubjects: Technology > Electrical engineering. Electronics Nuclear engineering Department: Faculty of Engineering > Electronic and Electrical Engineering Depositing user: Pure Administrator Date deposited: 07 Mar 2011 23:23 Last modified: 04 Sep 2024 12:13 URI: https://strathprints.strath.ac.uk/id/eprint/29027