Electrostatic droplet generation: Mechanism of polymer droplet formation

Bugarski, Branko; Li, Qiangliang; Goosen, Mattheus F. A.; Poncelet, Denis; Neufeld, Ronald J.; Vunjak, Gordana

doi:10.1002/aic.690400613

Cited by 145 publications

(110 citation statements)

References 9 publications

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“…were suspended in sterilized 1.5% (w/v) sodium alginate, extruded into 100 mM CaCl 2 using an electrostatic droplet generator (own product of our lab) and gelled for 30 min to form ALG beads (with modifications of [27]). After that, photos were taken by invert phasecontrast microscope (Nikon Eclipse Ti, Nikon, Tokyo, Japan) every other day.…”

Section: Adhesion and Alg Bead Cell Culturementioning

confidence: 99%

Encapsulated human hepatocellular carcinoma cells by alginate gel beads as an in vitro metastasis model

Liu

et al. 2013

Experimental Cell Research

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Section: Adhesion and Alg Bead Cell Culturementioning

confidence: 99%

Encapsulated human hepatocellular carcinoma cells by alginate gel beads as an in vitro metastasis model

Liu

et al. 2013

Experimental Cell Research

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“…Subsequent work has been very successful in producing practical spraying systems for widely varied applications such as ink-jet printing (Twardeck, 1977), fuel spraying (Kelly, 1984), liquid metal deposition (Vladimirov et al, 1993), hydrogen injection for nuclear fusion (Woosley et al, 1988), and biocatalyst production (Bugarski et al, 1994). Although most of the significant applications involve the spraying of liquids into air, some attention has been placed on liquid-liquid systems (Watanabe et al, 1978;Scott, 1990).…”

Section: Electrostatic Sprayingmentioning

confidence: 98%

Pumping, spraying, and mixing of fluids by electric fields

1998

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The mechanism of electrostatic spraying of insulating fluids, such as air or organic solvents, into relatively conductive fluids, such as water, is investigated in this work. Experiments with air sprayed into water through an electrified capillary showed that the pressure inside the capillary increases, reaches a maximum, and then decreases as the applied voltage is increased. The initial pressure increase is due to the electric stress on the fluid interface, while the decrease is due to the Coulombic electrohydrodynamic flow generated near the end of the capillary. It is shown that electric fields can cause simultaneous pumping, spraying, and mixing of fluids. This phenomenon is demonstrated for air and kerosene in water.On Ctudie dans ce travail le mecanisme de Keywords: electrostatic spraying, gas-liquid dispersions, liquid-liquid dispersions, microbubbles, microdrops lectric-field-driven processes have been known for many E years. Common industrial applications are solid-solid separations in the mining industry, coalescence of water-inoil emulsion in the petroleum industry, and removal of solid particles from exhaust gases in various technologies. Ptasinski and Kerkhof (1 992) reported several advantages of direct utilization of electrical energy, especially in multiphase systems. These advantages result from the fact that electrical energy supplied to the system interacts selectively with an interface and, to a lesser degree, with the bulk. This interaction may lead to increased rates of heat or mass transfer across an interface.Many chemical, biochemical, and environmental processes, such as extraction, distillation, stripping, flotation, and oxidation, depend upon the creation of multiphase dispersions consisting of a discontinuous phase-in the form of particles, drops, or bubbles-dispersed in a liquid, gaseous, or supercritical continuous phase. In most of these applications, the objective is to increase the surface area of contact for efficient transport of chemical species from one phase to another. In general, the performance of such systems is enhanced as the dispersed drop or bubble size is decreased. Traditional devices make use of mechanical agitation with various types of impellers to contact two or more phases. These devices provide kinetic energy to the bulk liquid, wasting a large fraction by viscous dissipation. Liquid-liquid and gas-liquid systems formed by mechanical agitation usually contain dispersed drops or bubbles in the millimeter-size range. By providing the energy required to create fine drops and bubbles right at the interface, electrostatic spraying is far more efficient than mechanical systems. Micron-sized drops or bubbles can be efficiently generated by electrostatic spraying. Recent results by Scott and Wham (1989), Scott et al. (1994), and *Author to whom correspondence may be addressed. E-mail address:+Managed by Lockheed Martin Energy Research Cop. tsourisc @ ornl .gov Tsouris et al. (1997) show that electrostatic-spraying processes may be much more efficient than conventi...

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“…Namely, applied electrostatic potential leads to the disruption of the liquid surface at the top of the needle, which in turn results in formation of a stream of charged droplets [15,17]. The main advantage of electrostatic extrusion is possibility to produce particles small in diameter and with very uniform size distribution [17]. Coaxial air flow technique includes development of droplets under the impact of compressed air.…”

Section: Extrusion Technologiesmentioning

confidence: 99%