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Study on the Properties of Plasma Activated Water for Bio-Decontamination : = Generation Characterization and Scale-Up.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Study on the Properties of Plasma Activated Water for Bio-Decontamination :/
Reminder of title:	Generation Characterization and Scale-Up.
Author:	Simon, Stephane Florent Joel.
Description:	1 online resource (184 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
Contained By:	Dissertations Abstracts International85-12B.
Subject:	Medicine. -
Online resource:	click for full text (PQDT)
ISBN:	9798383019764

Study on the Properties of Plasma Activated Water for Bio-Decontamination : = Generation Characterization and Scale-Up.
Simon, Stephane Florent Joel.

Study on the Properties of Plasma Activated Water for Bio-Decontamination :Generation Characterization and Scale-Up. - 1 online resource (184 pages)

Source: Dissertations Abstracts International, Volume: 85-12, Section: B.

Thesis (Ph.D.)--The University of Liverpool (United Kingdom), 2023.

Includes bibliographical references

Plasma activated water (PAW) is part of the new non-thermal technologies, and is under active investigation for its bactericidal properties and application in the food and medical sector. PAW is commonly formed through plasma exposure of water samples; in such treatment, the chemistry of the water exposed is modified and enhanced in reactive species formed within the plasma and transferred to the samples. In this work, various plasma reactors were developed to generate PAW which was characterised and tested for its efficiency in biological applications; those tests aim to define a standard method able to produce up to 1 L.min¹ of PAW with concentration of species compatible for bio-decontamination. The study consisted of three topics: (i) a comparison between direct and indirect formation of PAW for bacterial inactivation, (ii) a study on the initial chemical influence of regional water and their impact on the generation of PAW, and (iii) a proof of concept to generate high volumes of PAW through cavitation. Plasma-liquid interaction has been widely studied by the community with a plethora of reactors designed for this purpose. However, the chemical properties of the PAW can drastically differ from a configuration to another. The first part of this work aims to explore the generation of PAW by either direct or indirect plasma treat- ment. In the first case, the water sample is used as a ground electrode and plasma streamers are formed between the tip of the excited electrode and the water sample surface. Whereas in the second case, the plasma formed is confined at the surface of the excited electrode without interaction with the water sample. For the pur- pose of the work, similar power and treatment time were kept constant; the results showed that both PAW formed by direct or indirect contact had great potential for bio-decontamination. When looking at their chemistry, the PAW obtained by direct treatment had higher concentration of hydrogen peroxide which is known to be a strong oxidiser commonly employed in healthcare settings. However, its efficiency was found to be less significant compared the PAW obtained by indirect treatment. Additionally, the PAW obtained through indirect treatment contained higher con- centration of NO2, and NO3, which combined with a low pH could lead to the formation of HNO2,. This suggested that the PAW with higher concentration of ni trous acid could potentially lead to better bacterial inactivation, giving preference for the indirect discharge configuration. results were also confirmed by the second part of the research, where five tap water were selected (France, Norway, Palestine, Slovenia, and United Kingdom) and plasma treated. All water samples had an initial pH in the range of 7.9 to 82, fol- lowing plasma activation samples from the UK and Norway reached a pH below 3, whereas water from France and Palestine remained stable at 8. It was found these water contained higher concentration of bicarbonate encountering the acidification due by the plasma treatment. The concentration of NO3 increased in all samples, reaching a maximum concentration of 3 mM after a plasma exposure of 25 minutes: whereas the concentration of NO2, showed a non-linear dependence with exposure time, reaching between 10 and 25 µM after 25 minutes exposure.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798383019764Subjects--Topical Terms:

644133
Medicine.
Index Terms--Genre/Form:

554714
Electronic books.

Study on the Properties of Plasma Activated Water for Bio-Decontamination : = Generation Characterization and Scale-Up.
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245 1 0 $a Study on the Properties of Plasma Activated Water for Bio-Decontamination : $b Generation Characterization and Scale-Up.
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500 $a Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
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502 $a Thesis (Ph.D.)--The University of Liverpool (United Kingdom), 2023.
504 $a Includes bibliographical references
520 $a Plasma activated water (PAW) is part of the new non-thermal technologies, and is under active investigation for its bactericidal properties and application in the food and medical sector. PAW is commonly formed through plasma exposure of water samples; in such treatment, the chemistry of the water exposed is modified and enhanced in reactive species formed within the plasma and transferred to the samples. In this work, various plasma reactors were developed to generate PAW which was characterised and tested for its efficiency in biological applications; those tests aim to define a standard method able to produce up to 1 L.min¹ of PAW with concentration of species compatible for bio-decontamination. The study consisted of three topics: (i) a comparison between direct and indirect formation of PAW for bacterial inactivation, (ii) a study on the initial chemical influence of regional water and their impact on the generation of PAW, and (iii) a proof of concept to generate high volumes of PAW through cavitation. Plasma-liquid interaction has been widely studied by the community with a plethora of reactors designed for this purpose. However, the chemical properties of the PAW can drastically differ from a configuration to another. The first part of this work aims to explore the generation of PAW by either direct or indirect plasma treat- ment. In the first case, the water sample is used as a ground electrode and plasma streamers are formed between the tip of the excited electrode and the water sample surface. Whereas in the second case, the plasma formed is confined at the surface of the excited electrode without interaction with the water sample. For the pur- pose of the work, similar power and treatment time were kept constant; the results showed that both PAW formed by direct or indirect contact had great potential for bio-decontamination. When looking at their chemistry, the PAW obtained by direct treatment had higher concentration of hydrogen peroxide which is known to be a strong oxidiser commonly employed in healthcare settings. However, its efficiency was found to be less significant compared the PAW obtained by indirect treatment. Additionally, the PAW obtained through indirect treatment contained higher con- centration of NO2, and NO3, which combined with a low pH could lead to the formation of HNO2,. This suggested that the PAW with higher concentration of ni trous acid could potentially lead to better bacterial inactivation, giving preference for the indirect discharge configuration. results were also confirmed by the second part of the research, where five tap water were selected (France, Norway, Palestine, Slovenia, and United Kingdom) and plasma treated. All water samples had an initial pH in the range of 7.9 to 82, fol- lowing plasma activation samples from the UK and Norway reached a pH below 3, whereas water from France and Palestine remained stable at 8. It was found these water contained higher concentration of bicarbonate encountering the acidification due by the plasma treatment. The concentration of NO3 increased in all samples, reaching a maximum concentration of 3 mM after a plasma exposure of 25 minutes: whereas the concentration of NO2, showed a non-linear dependence with exposure time, reaching between 10 and 25 µM after 25 minutes exposure.
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