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Title: Mechanisms and control of single-step microfluidic generation of multi-core double emulsion droplets
Authors: Nabavi, Seyed Ali
Vladisavljevic, Goran T.
Manovic, Vasilije
Keywords: Multi-core double emulsion drops and capsules
Capillary microfluidics
Dripping-to-jetting transition
Droplet formation dynamics
Micro-particle image velocimetry
Core/shell silicon microcapsules
Issue Date: 2017
Publisher: Elsevier (© the authors)
Citation: NABAVI, S.A., VLADISAVLJEVIC, G.T. and MANOVIC, V., 2017. Mechanisms and control of single-step microfluidic generation of multi-core double emulsion droplets. Chemical Engineering Journal, 322, pp. 140-148.
Abstract: Single-step generation of monodisperse multi-core double emulsion drops in three-phase glass capillary microfluidic device was investigated using a micro-particle image velocimetry (micro-PIV) system. Phase diagrams were developed to predict the number of encapsulated inner drops as a function of the capillary numbers of inner, middle and outer fluid. The maximum stable number of inner drops cores in uniform double emulsion drops was six. Starting from core/shell drops, the formation of double emulsion drops with multiple cores was achieved by decreasing the capillary number of the outer fluid and increasing the capillary number of the middle fluid. A stable continuous jet of the middle fluid loaded with inner drops was formed at high capillary numbers of the middle fluid. Empirical correlations predicting the size and generation frequency of inner drops as a function of the capillary numbers and the device geometry were developed. Dual-core double emulsion drops were used as templates for the fabrication of polymeric capsules using “on-the-fly” photopolymerisation. The capsule morphology was controlled by manipulating the stability of the inner drops through adjusting the concentration of the lipophilic surfactant in the middle fluid. At low concentration of the lipophilic surfactant, inner drops coalesced during curing and single compartment capsules with thin shells were produced from dual-core drops. The core/shell capsules produced from multi-core drops were monodispersed and larger than those produced from core/shell drops in the same device.
Description: This article was published as Open Access by Elsevier under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence.
Sponsor: The authors gratefully acknowledge the financial support for this work from the UK Engineering and Physical Sciences Research Council (EPSRC) grant EP/HO29923/1.
Version: Published
DOI: 10.1016/j.cej.2017.04.008
URI: https://dspace.lboro.ac.uk/2134/24749
Publisher Link: http://dx.doi.org/10.1016/j.cej.2017.04.008
ISSN: 1385-8947
Appears in Collections:Published Articles (Chemical Engineering)

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