Equilibrium and Nonequilibrium States in Microfluidic Double Emulsions

Pannacci, Nicolas; Bruus, Henrik; Bartolo, Denis; Etchart, Isabelle; Lockhart, Thibaut; Hennequin, Yves; Willaime, Hervé; Tabeling, Patrick

doi:10.1103/physrevlett.101.164502

Cited by 131 publications

(146 citation statements)

References 19 publications

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“…Synthetic routes that do not require a confined environment for particle shaping have also been reported. For example, interfacial tension driven evolution of the droplet morphology, from core-shell (or complete engulfing) states to Janus (or partial engulfing) states, has been applied to the fabrication of polymer particles with templated convex/concave surfaces Pannacci et al 2008;Chen et al 2009). …”

Section: Introductionmentioning

confidence: 99%

A microfluidic cross-flowing emulsion generator for producing biphasic droplets and anisotropically shaped polymer particles

Nisisako

Hatsuzawa

2009

Microfluid Nanofluid

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We present a microfluidic cross-flowing system for producing biphasic emulsion droplets and non-spherical polymer microparticles. Microfluidic channels on a glass chip comprise a Y-shaped channel so as to form a twophase organic stream of photocurable and non-curable phases, and a T-junction to generate phase-separated droplets in a cross-flowing aqueous stream. The biphasic droplets at equilibrium formed a Janus configuration (partial engulfing) or a core-shell configuration (complete engulfing) consistent with minimizing the interfacial free energies among the three liquid phases, according to the three spreading coefficients. When silicone oil was used as the non-curable phase, monodisperse Janus droplets were generated reproducibly in a one-step process; for e.g., the mean particle size was 119 lm with a coefficient of variation (CV) of 1.9%. Subsequent UV-initiated polymerization yielded monodisperse particles with controlled convex/concave structures, which were tunable through variation of the ratio of the flow rates between the two organic phases. In contrast, when perfluorocarbon fluid, which is more hydrophobic than silicone oil, was used as the non-curable phase, monodisperse core-shell droplets were generated in a two-step regime, leading to the synthesis of cross-linked polymeric shells with a pore on their surfaces. We also investigated how the asymmetric flow configuration influenced droplet formation at the T-junction.

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Section: Introductionmentioning

confidence: 99%

A microfluidic cross-flowing emulsion generator for producing biphasic droplets and anisotropically shaped polymer particles

Nisisako

Hatsuzawa

2009

Microfluid Nanofluid

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“…20 Microfluidic emulsification/polymerisation is a promising tool for production of core-shell capsules of tuneable size and shell thickness. Two main microfluidic strategies for production of core-shell drops are one-step drop formation process using a single drop maker 21 and two-step drop formation process using two consecutive flow-focusing, 22 T-junction, 23 or co-flow 24 drop makers. Utada et al 21 have developed a 3D glass capillary device that combines counter-current flow focusing and co-flow.…”

Section: Introductionmentioning

confidence: 99%

Semipermeable Elastic Microcapsules for Gas Capture and Sensing

Nabavi

Vladisavljević

et al. 2016

Langmuir

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Monodispersed microcapsules for gas capture and sensing were developed consisting of elastic semipermeable polymer shells of tuneable size and thickness and pH-sensitive, gas selective liquid cores. The microcapsules were produced using glass capillary microfluidics and continuous on-the-fly photopolymerisation. The inner fluid was 5-30 wt% K 2 CO 3 solution with m-cresol purple, the middle fluid was a UV-curable liquid silicon rubber containing 0-2 wt% Dow Corning ® 749 fluid, and the outer fluid was aqueous solution containing 60-70 wt% glycerol and 0.5-2 wt% stabiliser (polyvinyl alcohol, Tween 20 or Pluronic ® F-127). An analytical model was developed and validated for prediction of the morphology of the capsules under osmotic stress based on the shell properties and the osmolarity of the storage and core solutions. The minimum energy density and UV light irradiance needed to achieve complete shell polymerisation were 2 J•cm -2 and 13.8 mW·cm -2 , respectively. After UV exposure, the curing time for capsules containing 0.5 wt% Dow Corning ® 749 fluid in the middle phase was 30-40 min. The CO 2 capture capacity of 30 wt% K 2 CO 3 capsules was 1.6-2 mmol/g depending on the capsule size and shell thickness. A cavitation bubble was observed in the core when the internal water was abruptly removed by capillary suction, whereas a gradual evaporation of internal water led to buckling of the shell. The shell was characterised using TGA, DSC, and FTIR. The shell degradation temperature was 450-460°C.

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“…Currently, the one-step high energy mixing method (Torza and Mason 1970;Friberg et al 2013;Ge et al 2014;Zarzar et al 2015) and the microfluidic method (Utada et al 2005;Nie et al 2006;Pannacci et al 2008;Guzowski et al 2012) are the two main techniques to form Janus droplets. For the one-step high energy mixing method, two immiscible oils are added into an aqueous surfactant solution first.…”

Section: Introductionmentioning

confidence: 99%

Redistribution of charged aluminum nanoparticles on oil droplets in water in response to applied electrical field

2016

J Nanopart Res

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Janus droplets with two opposite faces of different physical or chemical properties have great potentials in many fields. This paper reports a new method for making Janus droplets by covering one side of the droplet with charged nanoparticles in an externally applied DC electric field. In this paper, aluminum oxide nanoparticles on micro-sized and macro-sized oil droplets were studies. In order to control the surface area covered by the nanoparticles on the oil droplets, the effects of the concentration of nanoparticle suspension, the droplet size as well as the strength of electric field on the final accumulation area of the nanoparticles are studied.

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Equilibrium and Nonequilibrium States in Microfluidic Double Emulsions

Cited by 131 publications

References 19 publications

A microfluidic cross-flowing emulsion generator for producing biphasic droplets and anisotropically shaped polymer particles

A microfluidic cross-flowing emulsion generator for producing biphasic droplets and anisotropically shaped polymer particles

Semipermeable Elastic Microcapsules for Gas Capture and Sensing

Redistribution of charged aluminum nanoparticles on oil droplets in water in response to applied electrical field

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