Stability Characteristics of Dispersed Oil Droplets Prepared by the Microchannel Emulsification Method

Liu, Xinqi; Nakajima, Mitsutoshi; Nabetani, Hiroshi; Xu, Qing Yi; Ichikawa, Sosaku; Sano, Yoh

doi:10.1006/jcis.2000.7134

Cited by 16 publications

(11 citation statements)

References 23 publications

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“…Monodispersed emulsions prepared by MC emulsification have also been used for fundamental studies. 25 Using the present system, the production rate of emulsion is 1-10 mL/h in the case of 10% of the volume fraction. For scaleup of the equipment, the through-type systems have been proposed, on which 10 000 of the through-type MCs were fabricated on one plate.…”

Section: Introductionmentioning

confidence: 88%

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Characterization of Spontaneous Transformation-Based Droplet Formation during Microchannel Emulsification

et al. 2002

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Recently, we proposed a microchannel (MC) emulsification technique, which is a novel method for making a monodispersed emulsion from a microfabricated channel array. The droplet formation mechanism for MC emulsification is a unique one, in which the distorted dispersed phase is spontaneously transformed into spherical droplets by interfacial tension. The objective of this study was to characterize the flow in MC emulsification. We investigated the emulsification behavior at different flow velocities of the dispersed phase using MCs with different sizes and analogous shapes and found a critical flow velocity over which the character of flow changed drastically. The formed droplet diameters were almost constant below the critical velocity, and monodispersed emulsions were formed. The droplet diameters increased drastically above the critical velocity, and polydispersed emulsions were formed. The critical velocities were independent of MC size. Analysis using a dimensionless number revealed that the critical point, at which the character of the flow of MC emulsification changes, is determined by the Capillary number (Ca), which is the ratio of viscous force to interfacial tension force. Below the critical Ca, the interfacial tension, which is the driving force for droplet formation, is dominant, and the flow in MC emulsification was based on spontaneous transformation. Above the critical Ca, viscous force is dominant, and the flow is similar to laminar flow. We experimentally confirmed this idea using the dispersed and continuous phases with different viscosities, MCs with different sizes, and different interfacial tensions. These results suggested a law of similarity in MC emulsification, and the transition of the flow was determined by Ca. The information obtained in this study includes the essential physics underlying spontaneous transformation flow in MC emulsification and is useful for practical applications.

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Section: Introductionmentioning

confidence: 88%

“…We have applied it to preparing several types of oil-in-water emulsions, water-in-oil emulsions, lipid microparticles, polymer microparticles, and microcapsules. Monodispersed emulsions prepared by MC emulsification have also been used for fundamental studies …”

Section: Introductionmentioning

confidence: 99%

Characterization of Spontaneous Transformation-Based Droplet Formation during Microchannel Emulsification

et al. 2002

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“…MC array devices have also been used for production of monodispersed microbubbles (Yasuno et al, 2004), discoid droplets (Kobayashi et al, 2006), surfactant-free droplets stabilized by silica nanoparticles (Xu et al, 2005c) and oil droplets stabilised by lecithin-chitosan interfacial bilayers (Chuah et al, 2009b). Because of its ability to generate monodisperse droplets of tunable size on a larger scale than planar microfluidic devices, MCE is a usuful technique for fundamental studies on emulsions, for example studies of emulsion stability (Liu et al, 2001), crystallisation of emulsion droplets (Hamada et al, 2002), in vitro digestability of emulsified lipids, etc.…”

Section: Applications Of Microfluidic Devices With Parallel Microchanmentioning

confidence: 99%

Production of uniform droplets using membrane, microchannel and microfluidic emulsification devices

Vladisavljević

Kobayashi

Nakajima

2012

Microfluid Nanofluid

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“…5a and b). Liu et al [30] indicated that there were waterin-oil (W/O) droplets or other droplet structures in the oil phase when the SDS concentration exceeded its CMC. SDS molecules can diffuse from the water phase into the oil phase when the SDS concentration exceeds its CMC.…”

Section: Resultsmentioning

confidence: 99%

“…Droplet stability of clove essential oil prepared by MC emulsification was previously reported by Liu et al [30]. The stability of the oil droplets deposited at the bottom of a sample bottle was reported to depend on surfactant concentration.…”

Section: Introductionmentioning

confidence: 93%

Stability of monodisperse clove oil droplets prepared by microchannel emulsification

Purwanti

Neves

Uemura

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Stability Characteristics of Dispersed Oil Droplets Prepared by the Microchannel Emulsification Method

Cited by 16 publications

References 23 publications

Characterization of Spontaneous Transformation-Based Droplet Formation during Microchannel Emulsification

Characterization of Spontaneous Transformation-Based Droplet Formation during Microchannel Emulsification

Production of uniform droplets using membrane, microchannel and microfluidic emulsification devices

Stability of monodisperse clove oil droplets prepared by microchannel emulsification

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