Review on the physics of electrospray: From electrokinetics to the operating conditions of single and coaxial Taylor cone-jets, and AC electrospray

Gañán‐Calvo, Alfonso M.; López-Herrera, José M.; Herrada, Miguel A.; Ramos, António; Montanero, J. M.

doi:10.1016/j.jaerosci.2018.05.002

Cited by 213 publications

(177 citation statements)

References 156 publications

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“…However, when a low flow rate is utilized, stable particle fission is obtained. In addition, the solvent is volatilized and the Taylor cone with jet mode is obtained, producing low polydispersity, spherical morphology, and smaller particle size (Gañán‐Calvo, López‐Herrera, Herrada, Ramos, & Montanero, ; Smeets et al., ).…”

Section: Resultsmentioning

confidence: 99%

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Gallic Acid‐Loaded Zein Nanoparticles by Electrospraying Process

Tapia-Hernández

Del‐Toro‐Sánchez

Cinco-Moroyoqui

et al. 2019

Journal of Food Science

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Currently, electrospraying is a novel process for obtaining the nanoparticles from biopolymers. Zein nanoparticles have been obtained by this method and used to protect both hydrophilic and hydrophobic antioxidant molecules from environmental factors. The objective of this work was to prepare and characterize gallic acid‐loaded zein nanoparticles obtained by the electrospraying process to provide protection to gallic acid from environmental factors. Thus, it was related to the concentration of gallic acid in physicochemical and rheological properties of the electrosprayed solution, and also to equipment parameters, such as voltage, flow rate, and distance of the collector in morphology, and particle size. The physicochemical properties showed a relationship in the formation of a Taylor cone, in which at a low concentration of gallic acid (1% w/v), low viscosity (0.00464 ± 0.00001 Pa·s), and density (0.886 ± 0.00002 g/cm3), as well as high electrical conductivity (369 ± 4.3 µs/cm), forms a stable cone‐jet mode. The rheological properties and the Power Law model of the gallic acid‐zein electrosprayed solution demonstrated Newtonian behavior (n = 1). The morphology and size of the particle were dependent on the concentration of gallic acid. Electrosprayed parameters with high voltage (15 kV), low flow rate (0.1 mL/hr), and short distance (10 cm) exhibited a smaller diameter and spherical morphology. FT–IR showed interaction in the gallic acid‐loaded zein nanoparticle by hydrogen bonds. Therefore, the electrospraying process is a feasible technique for obtaining gallic acid‐loaded zein nanoparticles and providing potential protection to gallic acid from environmental factors.

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Section: Resultsmentioning

confidence: 99%

“…. is volatilized and the Taylor cone with jet mode is obtained, producing low polydispersity, spherical morphology, and smaller particle size (Gañán-Calvo, López-Herrera, Herrada, Ramos, & Montanero, 2018;Smeets et al, 2017).…”

Section: Food Engineering Materials Science and Nanotechnologymentioning

confidence: 99%

Gallic Acid‐Loaded Zein Nanoparticles by Electrospraying Process

Tapia-Hernández

Del‐Toro‐Sánchez

Cinco-Moroyoqui

et al. 2019

Journal of Food Science

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“…Ionic liquids (ILs) are room temperature molten salts with conductivities that are small in relation to those of liquid metals. Emission of ions from such liquids is a more recent development with heritage in electrospray [8,9] but of significant interest on account of the wide spectrum of complex molecular chemistries to which they facilitate access. These include heavy ions that are useful in electric propulsion, where the thrust-to-power ratio scales as the root of the ion mass [10][11][12], and highly reactive ions capable of precision etching [13].…”

Section: Introductionmentioning

confidence: 99%

Electrohydrodynamics of an ionic liquid meniscus during evaporation of ions in a regime of high electric field

2019

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Numerical investigations are presented for an ionic liquid meniscus undergoing evaporation of ions in a regime of high electric field. A detailed model is developed to simulate the behavior of a stationary meniscus attached to a liquid feed system. The latter serves as a proxy for commonly utilized electrospray emitters such as needles and capillary tubes. Two solution families are identified for prototype liquid analogous to the ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate (EMI-BF4). The first belongs to a regime of low electric field in which the meniscus is blunt and does not emit charge. The second belongs to a regime of high electric field in which a conelike meniscus produces charge from a sharp tip. Electrohydrodynamic features of the meniscus in this regime are presented. These reveal that the meniscus is Stokesian and hydrostatic and governed by conduction. The applied electric field influences both the shape of the meniscus and the current that it produces while the impedance of the feed system-which must be above a threshold value in order to ensure that the current, and therefore the flow, remains below a maximum value-influences the meniscus current but not the macroscopic shape. In general, this shape deviates from Taylor's idealized cone.

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“…Under AC polarization of pending drops on HV power lines, ES is also considered to account for power losses by ES and corona leakage currents (Hara et al, 1980;Farzaneh et al, 1985;Borra et al, 1999d;Xu P et al, 2017;Yin et al, 2017). Various modes of hydrodynamic and Electro-Hydro Dynamic (EHD) jet formation and fragmentation are reviewed in (Rosell-Llompardt et al, 2018b) focusing on Electro-Spray modes, as defined by (Cloupeau et al, 1989(Cloupeau et al, , 1990Cloupeau, 1994;Cloupeau et al, 1994) with a special attention paid to the cone-jet mode, detailed in (Ganan-Calvo et al, 2018). In that case, the drop turns into a conical shape because of the surface polarization and related outward normal electrical pressure that can only be balanced by the inward capillary pressure.…”

Section: Introductionmentioning

confidence: 99%

Review on water electro-sprays and applications of charged drops with focus on the corona-assisted cone-jet mode for High Efficiency Air Filtration by wet electro-scrubbing of aerosols

Borra

2018

Journal of Aerosol Science

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 electrosprays is a continuous production process of self-dispersed unipolar droplets with monodisperse/unimodal size distributions (0.2 < d modal < 150 µm)  Applications of ES of aqueous solutions are reviewed with special attention for material production and bio-applications  Means to achieve steady water ES are presented with respect to electrical discharges in ambient air around the liquid cone and jet  Streamer discharges with transient and asymmetric space charges disrupt the EHD equilibrium for steady cone-jet mode, while the axisymmetric and quasi-stationary space charge is required to achieve steady water ES in the pulseless corona-assisted cone-jet mode  Empirical scaling laws of droplet properties are reminded for both steady water ES in cone-jet with a pulseless corona and without discharge  High filtration efficiencies of a lab-scale wet bipolar-scrubbers (>99%) supports that Water ES in corona-assisted cone-jet could be applied to low cost Air cleaning

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Review on the physics of electrospray: From electrokinetics to the operating conditions of single and coaxial Taylor cone-jets, and AC electrospray

Cited by 213 publications

References 156 publications

Gallic Acid‐Loaded Zein Nanoparticles by Electrospraying Process

Gallic Acid‐Loaded Zein Nanoparticles by Electrospraying Process

Electrohydrodynamics of an ionic liquid meniscus during evaporation of ions in a regime of high electric field

Review on water electro-sprays and applications of charged drops with focus on the corona-assisted cone-jet mode for High Efficiency Air Filtration by wet electro-scrubbing of aerosols

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