Performance study of a twin-head electrospray system

Fu, Huijing; Liu, Qiaoling; Chen, Da‐Ren

doi:10.1016/j.jaerosci.2012.04.008

Cited by 13 publications

(9 citation statements)

References 29 publications

(22 reference statements)

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“…These losses were due to the high electrical charge per particle. This phenomenon was similar to that shown in the experimental results of Fu et al (2012). To mitigate this effect, as shown in Fig.…”

Section: Fabrication Of Np/mwcnt Hybrids Using Thessupporting

confidence: 89%

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Synthesis of hybrid carbon nanotube structures coated with Sophora flavescens nanoparticles and their application to antimicrobial air filtration

Hwang

Sim

Jung

2015

Journal of Aerosol Science

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a b s t r a c tControlling airborne microorganisms has become increasingly important with increase in human indoor activities, epidemic disease outbreaks, and airborne pathogen transmission. Treatments using antimicrobial nanoparticles have shown promise because of the high surface-to-volume ratio of nanoparticles compared to their bulk counterparts, and their unique physical and chemical properties. In this study, hybrid nanostructures of multiwalled carbon nanotubes (MWCNTs) coated with antimicrobial, natural product (NP) nanoparticles were synthesized using a twin-head electrospray system (THES). The coated nanoparticles were then used in antimicrobial air filters to increase their antimicrobial efficiency. Electrosprayed droplets were converted to NP nanoparticles and MWCNTs through ethanol evaporation. Oppositely charged NP nanoparticles and MWCNTs were coagulated via Coulombic collisions to form hybrid nanoparticles that were deposited continuously onto an air filter medium. The size distribution and composition of the hybrid NP/MWCNT particles were characterized using a wide-range particle spectrometer (WPS) and transmission electron microscope (TEM). The concentration of hybrid NP/MWCNT nanoparticles was lower than that of NP nanoparticles but higher than that of MWCNTs and showed a bimodal size distribution with peak diameters of 21.1 and 49 nm. TEM analyses confirmed that the NP nanoparticles were attached to the MWCNT surface with a density of $ 4-9 particles/MWCNT. When deposited onto the filter medium, NP/MWCNT particles formed dendrites on the filter's fiber surface. The filtration efficiency and pressure drop of the NP/MWCNT-coated filters were higher than those of pristine, NP nanoparticles-coated or MWCNTs-coated filters. The hybrid filter also exhibited stronger antimicrobial activity than those of NP or MWCNT-coated filters at identical deposited volumes (1.1 Â 10 -2 cm 3 / cm 2 filter ). Ninety-five percent of the tested bacterial aerosols were inactivated on the NP/ MWCNTs filter while only o70% were inactivated on NP-or MWCNT-coated filters.

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Section: Fabrication Of Np/mwcnt Hybrids Using Thessupporting

confidence: 89%

“…Langer and Yamate (1969) synthesized encapsulated (coated) aerosol particles. In addition, several researchers have fabricated spherical nanoparticles consisting of two chemical substances (Borra et al, 1999;Fu, Liu, & Chen, 2012).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of hybrid carbon nanotube structures coated with Sophora flavescens nanoparticles and their application to antimicrobial air filtration

Hwang

Sim

Jung

2015

Journal of Aerosol Science

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“…In order to reduce the size, electrospray crystallization was used for the production of submicron-sized niflumic acid (NIF) crystals (200 nm–800 nm), an anti-inflammatory drug, which is much smaller than the conventional NIF (around 80 μm) (Radacsi et al, 2012 and Ambrus et al, 2013). Fu et al (2012) prepared pharmaceutical particles containing both budesonide and epigallocatechin gallate due to charge-enhanced coagulation via customized bipolar electrospray setup. Other than pure drug solutions, additives together with drugs were also electrosprayed to form particulate formulations.…”

Section: Compositionmentioning

confidence: 99%

Electrohydrodynamic atomization: A two-decade effort to produce and process micro-/nanoparticulate materials

Xie

Jiang

Davoodi

et al. 2015

Chemical Engineering Science

263

159

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Electrohydrodynamic atomization (EHDA), also called electrospray technique, has been studied for more than one century. However, since 1990s it has begun to be used to produce and process micro-/nanostructured materials. Owing to the simplicity and flexibility in EHDA experimental setup, it has been successfully employed to generate particulate materials with controllable compositions, structures, sizes, morphologies, and shapes. EHDA has also been used to deposit micro- and nanoparticulate materials on surfaces in a well-controlled manner. All these attributes make EHDA a fascinating tool for preparing and assembling a wide range of micro- and nanostructured materials which have been exploited for use in pharmaceutics, food, and healthcare to name a few. Our goal is to review this field, which allows scientists and engineers to learn about the EHDA technique and how it might be used to create, process, and assemble micro-/nanoparticulate materials with unique and intriguing properties. We begin with a brief introduction to the mechanism and setup of EHDA technique. We then discuss issues critical to successful application of EHDA technique, including control of composition, size, shape, morphology, structure of particulate materials and their assembly. We also illustrate a few of the many potential applications of particulate materials, especially in the area of drug delivery and regenerative medicine. Next, we review the simulation and modeling of Taylor cone-jet formation for a single and co-axial nozzle. The mathematical modeling of particle transport and deposition is presented to provide a deeper understanding of the effective parameters in the preparation, collection and pattering processes. We conclude this article with a discussion on perspectives and future possibilities in this field.

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“…The balance between the electrical force applied to the surface of the liquid meniscus at the outlet of the spray head and the surface tension of the liquid enables formation of a liquid cone and forces a jet-spray emission from the apex of the cone. [24] This cone-jet mode, as described above, was achieved by adjusting the voltage in each condition. A light source was placed on a black background behind the nozzle, when the cone was stable; it remained perfectly black as all light was dispersed.…”

Section: Solution Preparationmentioning

confidence: 99%

Size and morphology controlling of PLGA microparticles produced by electro hydrodynamic atomization

Jafari-Nodoushan

Barzin

Mobedi

2015

Polymers for Advanced Techs

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Among the various methods used to produce microparticles, electrospraying is becoming increasingly popular, and it has the advantage of control over the size, shape and morphology of the produced particles. Particle size and morphology are the main factors used to control the rate of microsphere degradation and drug diffusion. The aim of this study was to use some process and solution parameters of the electrospraying such as flow rate, collecting distance, nozzle diameter and polymer molecular weight to control size, shape and morphology of the produced particles. Tests demonstrated that the size of microparticle can be fine-tuned by adjusting the variables of flow rate, collecting distance and nozzle diameter. Other relevant factors that can be as tuning parameters were those of solvent vapor pressure and application of a polymer mix with different molecular weights. Results showed that microparticle size increased under an increased flow rate and needle gauge setting and a decreased electrical field. Results of the tests showed that morphology of the produced microsphere could be adjusted by the aforementioned parameters. For example, by lowering solvent vapor pressure by adding solvent with a high boiling point, the morphology was changed from a textured surface to a smooth one. Molecular weight of the polymer had a significant effect on morphology, whereas polymer with a low molecular weight caused defect in the produced microparticle, and a high molecular weight produced cup-like morphology, but a polymer mix that constituted polymers of high and low Molecular weights improved morphology of the produced particles.

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Performance study of a twin-head electrospray system

Cited by 13 publications

References 29 publications

Synthesis of hybrid carbon nanotube structures coated with Sophora flavescens nanoparticles and their application to antimicrobial air filtration

Synthesis of hybrid carbon nanotube structures coated with Sophora flavescens nanoparticles and their application to antimicrobial air filtration

Electrohydrodynamic atomization: A two-decade effort to produce and process micro-/nanoparticulate materials

Size and morphology controlling of PLGA microparticles produced by electro hydrodynamic atomization

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