Formation of core–shell droplets for the encapsulation of liquid contents

Galogahi, Fariba Malekpour; Zhu, Yong; An, Hongjie; Nguyen, Nam‐Trung

doi:10.1007/s10404-021-02483-2

Cited by 14 publications

(14 citation statements)

References 38 publications

(43 reference statements)

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“…Fluorinated oil (HFE, Novec 7500 3 M, Merck, Darmstadt, Germany) was used as the core dispersed phase, whose density and dynamic viscosity are 1.61 g/mL and 1.31 mPa•s, respectively [8]. The shell dispersed phase was a polymer consisting of 0.06 g ethyl-4(dimethylamino) benzoate (Merck, Darmstadt, Germany), 0.05 g camphorquinone (Merck), and 10 g trimethylolpropane trimethacrylate (TMPTMA, Merck).…”

Section: Methodsmentioning

confidence: 99%

“…The sizes of the core and the outer droplets were tuned with the flow rates of the three liquid phases. In general, double emulsion droplets with diameters from ten to hundreds of micrometres can be formed [1,5,7,8]. However, larger core-shell droplets with diameters ranging from hundreds of micrometres to several millimetres are also required for applications such as cell manipulations [9,10], macrocapsules [11], and microreactors [12].…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Behaviours of Monodisperse Double Emulsion Formation in a Tri-Axial Capillary Device

et al. 2022

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We investigated experimentally, analytically, and numerically the formation process of double emulsion formations under a dripping regime in a tri-axial co-flow capillary device. The results show that mismatches of core and shell droplets under a given flow condition can be captured both experimentally and numerically. We propose a semi-analytical model using the match ratio between the pinch-off length of the shell droplet and the product of the core growth rate and its pinch-off time. The mismatch issue can be avoided if the match ratio is lower than unity. We considered a model with the wall effect to predict the size of the matched double emulsion. The model shows slight deviations with experimental data if the Reynolds number of the continuous phase is lower than 0.06 but asymptotically approaches good agreement if the Reynolds number increases from 0.06 to 0.14. The numerical simulation generally agrees with the experiments under various flow conditions.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Behaviours of Monodisperse Double Emulsion Formation in a Tri-Axial Capillary Device

et al. 2022

Self Cite

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show abstract

“…Fluorinated oil (HFE, Novec 7500 3 M) was used as the core dispersed phase, whose density and dynamic viscosity are 1.61 g/mL and 1.31 mPa•s, respectively [8]. The shell dispersed phase was a polymer consisting of 0.06 g ethyl-4(dimethylamino) benzoate (Merck), 0.05 g camphorquinone (Merck), and 10 g trimethylolpropane trimethacrylate (TMPTMA, Merck).…”

Section: Methodsmentioning

confidence: 99%

Dynamic behaviours of monodisperse double emulsion formation in a tri-axial capillary device

Dai

Cha

Nguyen

et al. 2022

Preprint

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We investigated experimentally, analytically and numerically the formation process of double emulsion formations under dripping regime in a tri-axial co-flow capillary device. The results show that mismatches of core and shell droplets under a given flow condition can be captured both experimentally and numerically. We propose a semi-analytical model using the match ratio between the pinch-off length of the shell droplet and the product of the core growth rate and its pinch-off time. The mismatch issue can be avoided if the match ratio is lower than unity. We considered a model with the wall effect to predict the size of the matched double emulsion. The model shows slight deviations with experimental data if the Reynolds number of continuous phase is lower than 0.06, but asymptotically approaches to good agreement if the Reynolds number increases from 0.06 to 0.14. The numerical simulation generally agrees with the experiments under various flow conditions.

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“…38 Another barrier to implementing droplet microfluidics is the instability and tendency of the droplets to coalesce during their generation. 39 Consequently, the usage of surfactants for stabilizing the droplets is inevitable. However, most surfactants are environmentally unfriendly, carcinogenic, 40 and highly toxic to humans.…”

Section: Introductionmentioning

confidence: 99%