Hybrid atmospheric pressure plasma generation and DC electrospray aerosolization of plasma‐activated water for surface pathogen disinfection

Chew, Nicholas S. L.; Ooi, Chien Wei; Yeo, Leslie; Tan, Ming K.

doi:10.1002/ppap.202200128

Cited by 9 publications

(10 citation statements)

References 62 publications

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“…Measured physical properties—(a) density ρ f , (b) viscosity μ f and (c) surface tension σ f —of deionized water (DI) and plasma‐activated water with different electrical conductivities σ e . These trends are consistent with that reported in an earlier study, [ 47 ] at least up to the highest value of σ e = 1 mS/cm measured in that work. The electrical conductivity for the DI water was approximately σ e = 0.003 mS/cm and that for plasma‐activated water was controlled by varying the treatment time, i.e., the exposure duration of DI water to atmospheric pressure plasma.…”

Section: Resultssupporting

confidence: 94%

“…This enhancement in nebulization rate can be attributed predominantly to the appreciable increase in wettability with the SiO 2 coating-as evidenced by the decrease in the static contact angle, especially at higher values of 𝜎 e (Table 1)-that facilitates the spreading of the liquid over the substrate, leading to longer films and hence a larger (c) surface tension 𝜎 f -of deionized water (DI) and plasma-activated water with different electrical conductivities 𝜎 e . These trends are consistent with that reported in an earlier study, [47] at least up to the highest value of 𝜎 e = 1 mS/cm measured in that work. The electrical conductivity for the DI water was approximately 𝜎 e = 0.003 mS/cm and that for plasma-activated water was controlled by varying the treatment time, i.e., the exposure duration of DI water to atmospheric pressure plasma.…”

Section: Effect Of the Sio 2 Coating On The Nebulization Ratesupporting

confidence: 93%

“…The experimental setup for the production of plasma‐activated aerosols via the uncoated/SiO 2 coated SAW devices is shown in Figure 1b. We then demonstrate in Section 2.3 that this allows for a considerably higher concentration of reactive species to be nebulized for surface disinfection: in contrast to previous studies, [ 39,40,47 ] wherein the electrical conductivity of the plasma‐activated water feedstock is below σ e < 1 mS cm −1 , considerably higher concentrations (σ e ⩽ 4 mS cm −1 ) can be nebulized at sufficiently high rates, leading to significantly lower volumes of plasma‐activated aerosols required to achieve complete inactivation of bacterial colonies on the surface.…”

Section: Introductionmentioning

confidence: 85%

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Efficient Generation of Plasma‐Activated Aerosols with High Concentrations of Reactive Species via Silicon Dioxide Coated Surface Acoustic Wave Devices

Chew,

Roudini,

Winkler

et al. 2024

Adv Materials Technologies

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An effective method to deliver plasma‐activated water onto contaminated surfaces is with a surface acoustic wave (SAW) nebulizer that can efficiently produce plasma‐activated aerosols. While higher reactive species concentrations in the plasma‐activated aerosols promote more efficient bacterial inactivation and hence reduce the amount of aerosols needed to completely eradicate the bacteria colonies, higher concentrations of reactive species themselves are found to lead to lower nebulization rates due to the increased electrical conductivity of the solution. To circumvent this problem, it is shown that coating the SAW substrate with a thin insulating layer of silicon dioxide (SiO2) can significantly mitigate the nebulization rate reduction. Specifically, when the electrical conductivity increases from 0.25 to 4.0 mS cm−1, the 62% drop in the nebulization rate is observed with the uncoated SAW devices is substantially reduced to 19% simply with the SiO2 coating. This can be attributed to the synergistic effects of increased wettability and the suppression of the electrical body force acting on the liquid film. The concomitant increase in the bacterial colony reduction from 17% to 76% demonstrates this solution to be a facile yet effective way of enhancing the efficiency for spray‐based bacterial inactivation on contaminated surfaces.

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Section: Resultssupporting

confidence: 94%

Section: Effect Of the Sio 2 Coating On The Nebulization Ratesupporting

confidence: 93%

Section: Introductionmentioning

confidence: 85%

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Efficient Generation of Plasma‐Activated Aerosols with High Concentrations of Reactive Species via Silicon Dioxide Coated Surface Acoustic Wave Devices

Chew,

Roudini,

Winkler

et al. 2024

Adv Materials Technologies

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“…Several studies have demonstrated the potential of plasmaactivated aerosols (PAAs) for disinfection (Jiang et al, 2017;Freyssenet and Karlen, 2019;Wong et al, 2020;Chew et al, 2022;Chew et al, 2023). It was observed that most PAA setups utilised commercial aerosol- The change in pH in deionised water samples contained within the first bubbling flask with increasing PAA exposure (A).…”

Section: Discussionmentioning

confidence: 99%

A rapid prototyped atmospheric non-thermal plasma-activated aerosol device and anti-bacterial characterisation

de Oliveira Mallia,

Griffin,

Buttigieg

et al. 2024

Front. Chem.

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Non-plasma technologies are being extensively investigated for their potential to mitigate microbial growth through the production of various reactive species. Predominantly, studies utilise atmospheric non-thermal plasma to produce plasma-activated liquids. The advancement of plasma-liquid applications has led to the investigation of plasma-activated aerosols (PAAs). This study aimed to produce a rapid-prototyped plasma-activated aerosol setup and perform chemical and anti-bacterial characterisation on the resultant activated aerosols. The setup was produced using stereolithography 3D printing, and air was used as the carrier gas. The novel design of the device allowed for the direct production of PAAs without the prior generation of plasma-activated water and subsequent aerosolisation. The generated PAAs were assessed for nitrite, hydrogen peroxide and ozone content using colourimetric assays. Anti-bacterial efficacy was tested against three human pathogenic strains: Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus and Salmonella enterica. It was observed that nitrite and ozone contact concentration increased with exposure time, yet no hydrogen peroxide was detected. The generated PAAs showed significant zones of no growth for all bacterial strains. These devices, therefore, show potential to be used as anti-bacterial disinfection technologies.

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Section: Physical Propertiesmentioning

confidence: 99%

Plasma-Activated Water: Physicochemical Properties, Generation Techniques, and Applications

et al. 2023

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Plasma-activated water (PAW) is water that has been treated with atmospheric pressure plasma. Due to the presence of reactive oxygen and nitrogen species (RONS), PAW can be used in various applications such as (1) surface disinfection and food decontamination, (2) enhancement in seed germination, and (3) enhancement in surface cooling in the nucleate boiling regime. Briefly, for surface disinfection, the reactive species in PAW can induce oxidative stress on microbes; for enhancement of seed germination, the reactive species in PAW can trigger seed germination and provide nutrients; for enhancement in surface cooling, the reactive species cause a reduction in the surface tension of PAW, facilitating the phase-change heat transfer and, quite unexpectedly, minimizing the surface oxidation. Here, we review the physicochemical properties of PAW, the three commonly used techniques (plasma jet, dielectric barrier discharge, and corona discharge) for generating atmospheric pressure plasma, and the use of PAW for the above three applications. In particular, we review the recent development of the miniaturization of the plasma generator integrated with an acoustic neutralizer to produce plasma-activated aerosols, elimination of the need for storage, and the interesting physicochemical properties of PAW that lead to cooling enhancement.

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Hybrid atmospheric pressure plasma generation and DC electrospray aerosolization of plasma‐activated water for surface pathogen disinfection

Cited by 9 publications

References 62 publications

Efficient Generation of Plasma‐Activated Aerosols with High Concentrations of Reactive Species via Silicon Dioxide Coated Surface Acoustic Wave Devices

Efficient Generation of Plasma‐Activated Aerosols with High Concentrations of Reactive Species via Silicon Dioxide Coated Surface Acoustic Wave Devices

A rapid prototyped atmospheric non-thermal plasma-activated aerosol device and anti-bacterial characterisation

Plasma-Activated Water: Physicochemical Properties, Generation Techniques, and Applications

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