Experimental study on the role of electrical conductivity in pulsating modes of electrospraying

Faraji, Sahand; Sadri, Behnam; Hokmabad, Babak Vajdi; Jadidoleslam, Navid; Esmaeilzadeh, E.

doi:10.1016/j.expthermflusci.2016.10.030

Cited by 33 publications

(9 citation statements)

References 36 publications

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“…The electrical conductivity of the electrosprayed solution is the parameter that determines the amount of the charge that a liquid may acquire while passing through the nozzle. Figure shows that a electrosprayed solution is charged quickly, resulting in a stable cone‐jet mode with smaller and uniform‐size particles, but an insulator electrosprayed solution receives a very small amount of charge or no charge, resulting in unstable cone‐jet mode formation, bigger particles with a large variation, and deposition of uneven particles (Faraji, Sadri, Hokmabad, Jadidoleslam, & Esmaeilzadeh, ; Khan, Nazir, & Maan, ). In this study, the electrosprayed solution with a lower concentration of GA (1% w/v) had high electrical conductivity (369 ± 4.3 µs/cm), which is related to the smaller particle size and to the similar morphology obtained and is demonstrated in Figure .…”

Section: Resultsmentioning

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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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%

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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“…Electrical conductivity of these sol solutions is presented at Table which shows sol 5A has the highest magnitude among these sols which helps its fluid jet to show more stability in the applied electric field and the Taylor cone shapes at the tip of the needle in lower voltages …”

Section: Resultsmentioning

confidence: 99%

Morphology enhancement of TiO₂/PVP composite nanofibers based on solution viscosity and processing parameters of electrospinning method

Sadeghi

Vaezi

Kazemzadeh

et al. 2018

J of Applied Polymer Sci

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In this work, different sol solutions with various titanium tetraisopropoxide (TIP)/glacial acetic acid ratios in 2‐propanol with 5 wt % poly(vinyl pyrrolidone) (PVP) (Mw = 360,000 g/mol) were prepared and electrospun. Composition of the prepared sols and as‐spun TiO2/PVP nanofibers were determined by Fourier transform infrared and Raman spectroscopy methods. Morphology of the electrospun TiO2/PVP nanofibers was studied by scanning electron microscopy and transmission electron microscopy (TEM) techniques. Rheometry measurements of the sol solutions showed decrease of viscosity upon the addition of TIP to the polymer solutions with constant polymer and acid concentrations. The sol solution having the lowest viscosity (at shear rate 10 s−1) but the highest TIP/glacial acetic acid ratio showed beaded nanofibers morphology when electrospun under 10 and 12 kV applied voltage while injection rate, needle tip to collector distance, and needle gauge were kept constant. However, smooth electrospun TiO2/PVP composite nanofibers with the average nanofibers diameters (148 ± 79 nm) were achieved under the same condition when applied voltage increased to 15 kV. TEM micrographs of the electrospun TiO2/PVP nanofiber showed that the TiO2 particles with continuous structure are formed at the middle of the nanofiber and distributed along its axis. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46337.

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“…Faraji et al study found that the overall stability of the spraying process is dependent on the electrical conductivity of a sample to a certain extent. It is also believed that an increase in conductivity leads to smaller droplet sizes which occur because during the process there is more of a charge in the liquid solution [50]. Table 2 shows that 1% w/v 1.4x10 3 g/mol-PCL acquires the highest conductivity value at 7.82 µS/cm and 5% w/v 8x10 3 g/mol-PCL with the lowest conductivity value at 6.39 µS/cm.…”

Section: Physical Characterization Of Solutionsmentioning

confidence: 97%

Electrospinning/electrospraying coatings for metal microneedles: A design of experiments (DOE) and quality by design (QbD) approach

Ali

Mehta

Monou

et al. 2020

European Journal of Pharmaceutics and Biopharmaceutics

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Experimental study on the role of electrical conductivity in pulsating modes of electrospraying

Cited by 33 publications

References 36 publications

Gallic Acid‐Loaded Zein Nanoparticles by Electrospraying Process

Gallic Acid‐Loaded Zein Nanoparticles by Electrospraying Process

Morphology enhancement of TiO₂/PVP composite nanofibers based on solution viscosity and processing parameters of electrospinning method

Electrospinning/electrospraying coatings for metal microneedles: A design of experiments (DOE) and quality by design (QbD) approach

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Experimental study on the role of electrical conductivity in pulsating modes of electrospraying

Cited by 33 publications

References 36 publications

Gallic Acid‐Loaded Zein Nanoparticles by Electrospraying Process

Gallic Acid‐Loaded Zein Nanoparticles by Electrospraying Process

Morphology enhancement of TiO2/PVP composite nanofibers based on solution viscosity and processing parameters of electrospinning method

Electrospinning/electrospraying coatings for metal microneedles: A design of experiments (DOE) and quality by design (QbD) approach

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Morphology enhancement of TiO₂/PVP composite nanofibers based on solution viscosity and processing parameters of electrospinning method