Relevant bibliographies by topics / Plasma-activated aerosols

Academic literature on the topic 'Plasma-activated aerosols'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Plasma-activated aerosols"

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Wong, Kiing S., William T. H. Lim, Chien W. Ooi, Leslie Y. Yeo, and Ming K. Tan. "In situ generation of plasma-activated aerosols via surface acoustic wave nebulization for portable spray-based surface bacterial inactivation." Lab on a Chip 20, no. 10 (2020): 1856–68. http://dx.doi.org/10.1039/d0lc00001a.

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SONG, YUANYUAN, and XUETONG FAN. "Hydrogen Peroxide Residue on Tomato, Apple, Cantaloupe, and Romaine Lettuce after Treatments with Cold Plasma–Activated Hydrogen Peroxide Aerosols." Journal of Food Protection 84, no. 8 (April 1, 2021): 1304–8. http://dx.doi.org/10.4315/jfp-21-051.

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ABSTRACT Hydrogen peroxide (H2O2) has long been studied as an aqueous sanitizer to enhance microbial safety of fresh produce. Recently, we demonstrated that cold plasma–activated H2O2 aerosols, hereafter called ionized hydrogen peroxide (iHP), reduced populations of Salmonella, Listeria, and Escherichia coli by up to 5.5 log on surfaces of various produce items. However, the amount and fate of H2O2 residue left on fresh produce after treatments have not been evaluated. In the present study, H2O2 residue levels on apples, tomatoes, cantaloupe, and romaine lettuce were analyzed after treatments with 7.8% iHP at conditions that had been optimized and tailored for Salmonella reductions and each produce item. Results showed that higher residue levels were found on lettuce than on cantaloupe, tomatoes, and apples immediately after treatments. During storage at 10 and 22°C, H2O2 levels decreased rapidly and fell below 1 mg/kg within 1 day after treatments for all fresh produce items. Furthermore, the decrease was faster at 22°C than at 10°C. Most importantly, the levels of H2O2 residue on the fresh produce items were lower than those after wash with 1% H2O2 for 1 min. Overall, our results demonstrated that levels of H2O2 residue on fresh produce surfaces decomposed rapidly after treatment with iHP and did not appear to pose a safety concern after 1 day of storage. HIGHLIGHTS
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Mehta, Simren, Jiayong Xu, Yanhua Wang, and John Chan. "Role of secreted IgM in regulating the host response to Mycobacterium tuberculosis." Journal of Immunology 196, no. 1_Supplement (May 1, 2016): 65.19. http://dx.doi.org/10.4049/jimmunol.196.supp.65.19.

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Abstract B cell aggregates, which display characteristics of germinal center reactions, are a prominent feature in the lungs of Mycobacterium tuberculosis (Mtb)-infected hosts. Using the B cell-deficient mouse strain μMT, we have previously shown that B cells are required for optimal protection against aerosol Mtb infection. μMT mice display exacerbated lung granulomatous inflammation during acute tuberculosis (TB), and this can be ameliorated by adoptive transfer of B cells or treatment with immune serum, suggesting a role for immunoglobulin in modulating the local lung response to Mtb. To investigate the role of antibody in a protective host response to Mtb, we utilized mice deficient in various immunoglobulins. Mice unable to secrete IgM (μS−/−) were more susceptible to aerosol Mtb infection than those lacking all other immunoglobulin isotypes, and displayed increased mortality during chronic TB. Relative to wild-type (WT) mice, Mtb-infected μS−/− mice had fewer lymphoid aggregates and a delayed granulomatous response in the lungs, despite having greater numbers of activated pulmonary CD4+ T cells. Treatment of μS−/− mice with immune serum (derived from Mtb-infected WT mice) during acute infection, led to increased lymphoid aggregates and plasma cells in the lungs, more pulmonary infiltrate, a concomitant decrease in the lung bacterial burden, and ultimately delayed the onset of death of μS−/− mice during chronic TB. These data suggest IgM plays an important role in controlling Mtb infection by orchestrating local granulomatous responses in the lungs, which leads to improved host survival during the chronic phase of infection.
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Silsby, J. A., S. Simon, J. L. Walsh, and M. I. Hasan. "The Influence of Gas–Liquid Interfacial Transport Theory on Numerical Modelling of Plasma Activation of Water." Plasma Chemistry and Plasma Processing 41, no. 5 (May 29, 2021): 1363–80. http://dx.doi.org/10.1007/s11090-021-10182-7.

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AbstractPlasma activated water has shown great promise in a number of emerging application domains; yet the interaction between non-equilibrium plasma and liquid represents a complex multiphase process that is difficult to probe experimentally, necessitating the development of accurate numerical models. In this work, a global computational model was developed to follow the concentrations of aqueous reactive species in water treated using a surface barrier discharge in ambient air. While the two-film theory has long superseded other methods of modelling mass transfer in such areas of research as environmental and aerosol science, plasma modelling studies continue to use equilibrium and one-film theories. The transport of reactive species across the gas–liquid interface was therefore treated using the one-film and two-film theories, with the results compared to ascertain which is most appropriate for PAW modelling studies. Comparing the model-predicted concentrations to those measured, it was shown that concentrations of aqueous H+ and NO3− ions were better represented by the two-film theory, more closely fitting experimental measurements in trend and in magnitude by a factor of ten, while HNO2 and NO2− showed a slightly worse fit using this theory. This is attributed to the assumption in two-film theory of a gas-phase stagnant film which provides additional resistance to the absorption of hydrophilic species, which is absent in the one-film theory, which could be improved with a more accurate value of the Sherwood number for each species.
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Jiang, Yunbin, Kimberly Sokorai, Georgios Pyrgiotakis, Philip Demokritou, Xihong Li, Sudarsan Mukhopadhyay, Tony Jin, and Xuetong Fan. "Cold plasma-activated hydrogen peroxide aerosol inactivates Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria innocua and maintains quality of grape tomato, spinach and cantaloupe." International Journal of Food Microbiology 249 (May 2017): 53–60. http://dx.doi.org/10.1016/j.ijfoodmicro.2017.03.004.

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Song, Yuanyuan, Bassam A. Annous, and Xuetong Fan. "Cold plasma-activated hydrogen peroxide aerosol on populations of Salmonella Typhimurium and Listeria innocua and quality changes of apple, tomato and cantaloupe during storage - A pilot scale study." Food Control 117 (November 2020): 107358. http://dx.doi.org/10.1016/j.foodcont.2020.107358.

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Halak, О., N. Poltorak, О. Kravchuk, V. Synko, and Y. Korol. "APPLICATION OF TITANIUM OXIDE COATINGS FOR NEUTRALIZATION OF HAZARDOUS CHEMICAL SUBSTANCES." Collection of scientific works of Odesa Military Academy 2, no. 12 (December 27, 2019): 131–36. http://dx.doi.org/10.37129/2313-7509.2019.12.2.131-136.

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Contamination of hazardous chemicals is currently considered one of the major environmental problems. The methods of purification of gaseous emissions depending on the physicochemical properties of pollutants, in particular dangerous chemical, their aggregate state, concentration in the gas environment are studied in this article. The effect of aerosol content such as dust and soot is analyzed as well as the efficiency of purification methods at different temperature intervals, methods of purification of multicomponent mixtures. The comparative characteristics of thermochemical, reagent, sorption and catalytic methods are given and the prospects of their application in filtering systems of stationary and mobile objects are evaluated. It has been proved that almost any organic compounds can be oxidized (mineralized) on the TiO2surface. In practice, any photocatalytic air purifier includes a porous TiO2 deposited carrier, which is irradiated with ultraviolet rays and through which air is purged. Photocatalysis is suitable for domestic use as it can occur at room temperature. For example, a thermocatalytic method of destroying harmful substances requires preheating the air to a temperature above 200 ° C. Photocatalysis destroys substances that penetrate even through activated carbon filters. Features of formation of oxide coatings by plasma-electrolytic oxidation of titanium alloys are considered. It is proposed to refine the design of collective defense systems on armored vehicles and stationary facilities with additional installation in the filter-absorber of the grid with the deposited layer of catalytic material, which will neutralize various types of dangerous chemicals due to photocatalytic air purification.
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Albe, Joseph R., Henry Ma, Theron H. Gilliland, Cynthia M. McMillen, Christina L. Gardner, Devin A. Boyles, Emily L. Cottle, et al. "Physiological and immunological changes in the brain associated with lethal eastern equine encephalitis virus in macaques." PLOS Pathogens 17, no. 2 (February 3, 2021): e1009308. http://dx.doi.org/10.1371/journal.ppat.1009308.

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Aerosol exposure to eastern equine encephalitis virus (EEEV) can trigger a lethal viral encephalitis in cynomolgus macaques which resembles severe human disease. Biomarkers indicative of central nervous system (CNS) infection by the virus and lethal outcome of disease would be useful in evaluating potential medical countermeasures, especially for therapeutic compounds. To meet requirements of the Animal Rule, a better understanding of the pathophysiology of EEEV-mediated disease in cynomolgus macaques is needed. In this study, macaques given a lethal dose of clone-derived EEEV strain V105 developed a fever between 2–3 days post infection (dpi) and succumbed to the disease by 6 dpi. At the peak of the febrile phase, there was a significant increase in the delta electroencephalography (EEG) power band associated with deep sleep as well as a sharp rise in intracranial pressure (ICP). Viremia peaked early after infection and was largely absent by the onset of fever. Granulocytosis and elevated plasma levels of IP-10 were found early after infection. At necropsy, there was a one hundred- to one thousand-fold increase in expression of traumatic brain injury genes (LIF, MMP-9) as well as inflammatory cytokines and chemokines (IFN-γ, IP-10, MCP-1, IL-8, IL-6) in the brain tissues. Phenotypic analysis of leukocytes entering the brain identified cells as primarily lymphoid (T, B, NK cells) with lower levels of infiltrating macrophages and activated microglia. Massive amounts of infectious virus were found in the brains of lethally-infected macaques. While no infectious virus was found in surviving macaques, quantitative PCR did find evidence of viral genomes in the brains of several survivors. These data are consistent with an overwhelming viral infection in the CNS coupled with a tremendous inflammatory response to the infection that may contribute to the disease outcome. Physiological monitoring of EEG and ICP represent novel methods for assessing efficacy of vaccines or therapeutics in the cynomolgus macaque model of EEEV encephalitis.
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Chew, Nicholas S. L., Kiing S. Wong, Wei S. Chang, Chien W. Ooi, Leslie Y. Yeo, and Ming K. Tan. "Nanoscale plasma-activated aerosol generation for in situ surface pathogen disinfection." Microsystems & Nanoengineering 8, no. 1 (April 14, 2022). http://dx.doi.org/10.1038/s41378-022-00373-3.

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AbstractPlasma treatment constitutes an efficient method for chemical-free disinfection. A spray-based system for dispensing plasma-activated aerosols onto surfaces would facilitate disinfection of complex and/or hidden surfaces inaccessible to direct line-of-sight (for example, UV) methods. The complexity and size of current plasma generators (for example, plasma jet and cometary plasma systems)—which prohibit portable operation, together with the short plasma lifetimes, necessitate a miniaturized in situ technique in which a source can be simultaneously activated and administered on-demand onto surfaces. Here, we demonstrate this possibility by combining two nanoscale technologies for plasma and aerosol generation into an integrated device that is sufficiently small and lightweight. Plasma is generated on a carpet of zinc oxide nanorods comprising a nanoneedle ensemble, which when raised to a high electric potential, constitutes a massive point charge array with near-singular electric fields to effect atmospheric breakdown. The plasma is then used to activate water transported through an underlying capillary wick, that is subsequently aerosolized under MHz-order surface acoustic waves. We show that the system, besides being amenable to miniaturization and hence integration into a chipscale device, leads to a considerable improvement in plasma-activation over its macroscale cometary discharge predecessor, with up to 20% and 127% higher hydrogen peroxide and nitrite ion concentrations that are respectively generated in the plasma-activated aerosols. This, in turn, leads to a 67% reduction in the disinfection time to achieve 95% bacterial load reduction, therefore demonstrating the potential of the technology as an efficient portable platform for on-demand field-use surface disinfection.
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Fan, Xuetong, Bryan T. Vinyard, and Yuanyuan Song. "Cold plasma-activated hydrogen peroxide aerosols inactivate Salmonella Typhimurium and Listeria innocua on smooth surfaces and stem scars of tomatoes: Modeling effects of hydrogen peroxide concentration, treatment time and dwell time." Food Control, June 2022, 109153. http://dx.doi.org/10.1016/j.foodcont.2022.109153.

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Conference papers on the topic "Plasma-activated aerosols"

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Shimada, Taro, Atsushi Takamura, Atsushi Kamiya, Takenori Sukegawa, and Tadao Tanaka. "Plasma Arc Cutting Experiments Using Radioactive Materials for Evaluation of Airborne Dispersion Ratio." In ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2009. http://dx.doi.org/10.1115/icem2009-16106.

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Experiments for airborne dispersion ratio of radionuclides during plasma arc cutting were carried out in a contamination control enclosure, using stored radioactive metal wastes arising from the decommissioning activities of Japan Power Demonstration Reactor, which was a boiling water type reactor. Neutron induced-activated piping and surface contaminated piping were segmented into pieces using air plasma arc cutting, using a current power was 100A. In addition, similar experiments for contaminated piping of the Advanced Thermal Reactor, Fugen were carried out. As a result, dispersion ratios for activated piping were 0.2 to 0.7% of Co-60 and 0.4% of Ni-63 under the condition with a covered cap on the head. And those for surface contaminated piping were from 18 to 23%. In addition, those for vertically segmented piping which simulated flat plate were from 34 to 43%. There was no difference of dispersion ratios between stainless steel and carbon steel base materials. All values obtained were smaller than the Handbook recommended value of 70% for contaminated materials. Filtering collection efficiencies of the coarse dust filter were approximately 40% for activated piping and approximately 55 to 80% for surface contaminated piping. However there was no effect for collection of aerosols smaller than 1 μm. Size distribution analysis indicated a greater concentration of radionuclides in particles smaller than 0.1μm when compared with larger particles. In addition, there was a tendency that the Ni-63 was concentrated to the particles smaller than 0.3 μm compared with the Co-60. The results support data obtained in the previous studies using non-radioactive materials.
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Shahien, M., K. Shinoda, and J. Akedo. "Hybrid Aerosol Deposition as an Outstanding Prospective for Dense Barrier Ceramic Coatings Deposition on Different Substrates." In ITSC2022. DVS Media GmbH, 2022. http://dx.doi.org/10.31399/asm.cp.itsc2022p0709.

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Abstract Deposition of protective dense environmental barrier layers is a promising solution to improve the reliability and environmental durability of the next-generation turbines and other industrial applications. In this context, spraying of fine particles could enhance the formation of fine dense coating microstructures with improved properties. In AIST we are focusing on the spraying of the fine particles via different spraying technologies including suspension plasma spraying, as well as deposition of the fine solid particles directly by aerosol deposition (AD) and plasma-assisted aerosol deposition (so-called Hybrid Aerosol Deposition; HAD. The HAD is a new coating window to spray the fine ceramic particles via the implementation of a low-power rf-plasma source to assist the aerosol deposition at room temperature. This study introduced the feasibility of utilization of HAD as an outstanding technology for deposition of dense ceramic coatings on different substrate materials and 3D deposition capability. Highly dense and well-adhered Al2O3 coatings without obvious observable cracks and bulk-like properties were successfully fabricated on different substrate materials of SUS 304, Aluminium, Al2O3 and glass, via HAD of fine particles. The substrate material and its hardness significantly influenced the first deposition step, which determined the coating adhesion and properties. Furthermore, homogeneously uniform, dense, and crack-free coating with a strong adhesion has been fabricated successfully on cylindrical substrates with 6.3 mm diameter. During HAD spraying the plasma activated the surface of the particles without reaching to the molten state, then the activated particles impact and stuck with the substrate by room temperature impact consolidation mechanism. Therefore, the fabricated coatings had the same crystal structure as the starting feedstock powder, and the activated surface act as glue and improved the deposition efficiency and 3D capabilities. Herein, the deposition phenomena of HAD makes it as a promising candidate technology for development of environmental and sealing layers of highly dense microstructure, with the targeted crystalline phase structure, without stoichiometric composition nor phase transformation and improved deposition efficiency on multi-shape components in different fields such as environmental, thermal barrier coatings (TBCs), environmental barrier coatings (EBCs) and gas turbine applications.
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Iguchi, Yukihiro, Tsutomu Baba, and Hiroto Kawakami. "Study for Nuclide Transfer Ratio of Particles Generated by Thermal Cutting." In 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/icone14-89139.

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In dismantling of nuclear facilities, secondary products would disperse into air and water. Thus, it is necessary to assess the effective dose for the public due to the gaseous and liquid radioactive wastes discharged. Especially for the cutting of a highly activated reactor core structures, the material may release special nuclides, some of which can be metal with low melting temperature and relatively high vapor pressure. In this case, the vaporized metal easily transfers to the particles instead of leaving in the dross and would make significant impact to the work place and environment. A pressure-tube type reactor often utilizes zirconium alloy as core structure, which may contains nuclides with high vapor pressure such as radioactive tin or antimony caused by activated tin. In this study, the radioactivity transfer ratio for thermal cutting in air has been investigated by cold tests. The tests have been carried out in an air-tight clean house and used a dust sampling system. The test piece was zirconium and niobium 2.5% alloy with some impurities, which was non-radioactive spare material for the pressure tube of Fugen NPS. Plasma cutting method was carried out with 200 A electric current. The particles were separated by one micrometer size with membrane filters and the material was investigated with an Energy Dispersion X-ray Analyzer (EDX) and the shape of the particle was observed with a Scanning Electron Microscope (SEM). The results showed that there was almost no tin in the dross because most of the tin was evaporated and transferred to aerosol. However, the ratio of zirconium, niobium and iron in the aerosol was not as high as that of tin. The vaporization pressure of antimony is higher than that of tin. The tin can be easily activated by neutron and becomes radioactive antimony. Because Zircalloy-2 or 4 contains ca. 1 percent of tin, irradiated Zircalloy contains significant radioactive antimony (Sb-125). Preparatory analyses showed that the Sb-125 to the environmental impact was comparable with other nuclides. For this reason a test for taking data of the transfer ratio of antimony by using irradiated material has been also carried out.
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Cesari, Franco G., Massimo Rogante, Angelo Giostri, and Gianmario Conforti. "Contaminated Metal Components in Dismantling by Hot Cutting Processes." In 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/icone14-89451.

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During the preparatory dismantling activities of Caorso’s Nuclear Power Plant (NPP), an experimental campaign using plasma and oxyacetylene metal cutting processes has been performed and applied to plates and tubes exposed to the coolant steam of the reactor. The plant (Boiling Water Reactor, 870 MWe) was designed and built in the 70s, and it was fully operating by 1981 to 1986 being shut down after 1987 Italy’s poll that abrogated nuclear power based on U235 fission. The campaign concerns no activated materials, even if the analyses have been performed of by use contaminated components under the free release level, not yet taking into account radioactivity. In this paper, the parameters related to inhalable aerosol, solid and volatile residuals production have been, studied during hot processes which applies the same characteristics of the cutting in field for the dismantling programs of Caorso NPP. The technical parameters such as cutting time and cutting rate vs. pipe diameter/thickness/schedule or plate thickness for ferritic alloys and the emissions composition coming from the sectioning are also reported. The results underline the sort of trouble that can emerge in the cutting processes, in particular focusing on the effects comparison between the two cutting processes and the chemical composition of powders captured by filtering the gaseous emission. Some preliminary considerations on methodology to be used during the dismantling have been presented.
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