1,721,053 research outputs found
Dataset related to the publication "Production and chemical composition of Plasma Activated Water: a systematic review and meta-analysis”
No full textThe physio-chemical interplay between cold atmospheric plasma (CAP) and water confers unique chemical and biological properties to the liquid, producing plasma-activated water (PAW). This dataset contains data related to various methodologies for PAW production. The data were obtained by systematically reviewing the literature on PAW production, focusing on the effects of process parameters on Reactive Oxygen and Nitrogen Species (RONS) concentration and pH levels in PAW. The collected data detail CAP sources, working gases, and treatment conditions, showcasing their impact on PAW processes
Data related to the optimisation of plasma process for decontamination of bacterial contaminants on polymeric food packaging materials
No full textCold plasma represents a possible alternative to conventional methods for packaging decontamination. However, this novel technology still needs investigations to be ready for an industrial implementation. This dataset contains raw data related to an optimisation study on a plasma decontamination system. In particular, acquisitions of temperature of packaging samples during treatment, logarithmic reductions of the bacterial load on contaminated samples after treatment and reactive species concentrations produced by plasma are collected in the present set
Combating viruses with cold plasma: A systematic review of cold atmospheric plasma applications in virology. DATASET
No full textThe data set consists of an excel file containing all the data used for the redaction of the systematic review “Combating viruses with cold plasma: A systematic review of cold atmospheric plasma applications in virology” submitted for publication
Recommendations and guidelines for the description of cold atmospheric plasma devices in studies of their application in food processing
Get PDFIn this article, we propose an approach to provide a schematic and exhaustive description of a Cold Atmospheric Plasma (CAP) process; particular focus is placed on defining and differentiating the operating conditions of a plasma discharge and the fundamental characteristics of the resulting processes.
After identifying the main techniques to characterise a CAP treatment, two fundamental analyses to support their study are described in detail: electrical analysis, presenting different methods together with the equipment required to properly perform the measurements, and chemical analysis of the gas phase, discussing optical absorption spectroscopy (OAS) as a quantitative technique that poses relatively low challenges in terms of equipment availability and elaboration of acquired data.
Finally, a practical example of a detailed description of a plasma device, its electrical characterization and its gas phase characterization by means of OAS will is provided
Optimisation of plasma processes for decontamination of bacterial contaminants on polymeric food packaging materials
Get PDFFoodborne diseases present a global health challenge, with over 420 000 deaths annually.
Packaging plays a vital role in food safety but can introduce hazards if contaminated.
Traditional decontamination methods are energy-intensive or leave toxic residues. Cold plasma
technology offers promising solutions for generating antimicrobial reactive species. This study
optimises a plasma system for packaging decontamination, achieving high inactivation rates for
Staphylococcus epidermidis (gram-positive) and Acinetobacter baumannii (gram-negative),
respectively 3.5 and 4.7. Statistical analysis guide process optimisation, highlighting factors
enhancing biocidal action: treatment chamber size reduction, high duty cycle, and mist
injection. The system proves effective against both kinds of bacteria, with gram-negative
bacteria showing higher sensitivity. The study focuses on optimising an innovative process,
emphasising the process towards industrialisation and highlighting economic and environmental
benefits. This investigation’s innovative approach aims to bridge the gap between laboratory
prototypes and industrial applications
Method for producing, from a polymer matrix in a liquid phase, a solid material containing nano-additives
No full textA method for producing, from a polymer matrix in liquid phase, a solid material containing nano-additives, according to which a polymer matrix in liquid phase is prepared and treated with a non-thermal plasma at atmospheric pressure applied to the polymer matrix in liquid phase, at least one nano-additive is added to the polymer matrix in liquid phase, the polymer matrix in liquid phase containing the nano-additive is stirred and, finally, the polymer matrix in liquid phase containing the nano-additive is brought into a solid state
Characterization of a Cold Atmospheric Pressure Plasma Jet Device Driven by Nanosecond Voltage Pulses
Get PDFThe structure, fluid-dynamic behavior, temperature, and radiation emission of a cold atmospheric pressure plasma jet driven by high-voltage pulses with rise time and duration of a few nanoseconds have been investigated. Intensified charge-coupled device (iCCD) imaging revealed that the discharge starts when voltage values of 5-10 kV are reached on the rising front of the applied voltage pulse; the discharge then propagates downstream the source outlet with a velocity around 107-108 cm/s. Light emission was observed to increase and decrease periodically and repetitively during discharge propagation. The structure of the plasma plume presents a single front or either several branched subfronts, depending on the operating conditions; merging results of investigations by means of Schlieren and iCCD imaging suggests that branching of the discharge front occurs in spatial regions where the flow is turbulent. By means of optical emission spectroscopy, discharge emission was observed in the ultraviolet-visible (UV-VIS) spectral range (N2, N2+, OH, and NO emission bands); total UV irradiance was lower than 1 μW/cm2 even at short distances from the device outlet (<15 mm). Plasma plume temperature does not exceed 45 °C for all the tested operating conditions and values close to ambient temperature were measured around 10 mm downstream the source outlet
Atmospheric Non-Equilibrium Plasma Promotes Cell Death and Cell-Cycle Arrest in a Lymphoma Cell Line
Get PDFAtmospheric non-equilibrium plasma is drawing interest as a promising tool for cancer treatment due to its blend of physical and chemical components that can exert anti-tumor effects. In this work, we investigate the effects of plasma treatment, performed by means of a wand electrode DBD driven by nanosecond high voltage pulses, on the viability, proliferation, and cell-cycle distribution of cells of mouse lymphoma. Results for direct treatment, with cell exposed to plasma while suspended in culture medium, and indirect treatment, where cells were added to culture medium previously activated by plasma treatment, are compared. A qualitative characterization by means of high-speed and iCCD imaging of the plasma discharges produced for the different operating conditions adopted in biological experiments, as well as a semi-quantitative study of the reactive species produced by plasma treatment in the culture medium, are also presented
Investigation of the antimicrobial activity at safe levels for eukaryotic cells of a low power atmospheric pressure inductively coupled plasma source
No full textLow power atmospheric pressure inductively coupled thermal plasma sources integrated with a quenching device (cold ICP) for the efficient production of biologically active agents have been recently developed for potential biomedical applications. In the present work, in vitro experiments aimed at assessing the decontamination potential of a cold ICP source were carried out on bacteria typically associated with chronic wounds and designed to represent a realistic wound environment; further in vitro experiments were performed to investigate the effects of plasma-irradiated physiological saline solution on eukaryotic cells viability. A thorough characterization of the plasma source and process, for what concerns ultraviolet (UV) radiation and nitric oxide production as well as the variation of pH and the generation of nitrates and nitrites in the treated liquid media, was carried out to garner fundamental insights that could help the interpretation of biological experiments. Direct plasma treatment of bacterial cells, performed at safe level of UV radiation, induces a relevant decontamination, both on agar plate and in physiological saline solution, after just 2 min of treatment. Furthermore, the indirect treatment of eukaryotic cells, carried out by covering them with physiological saline solution irradiated by plasma, in the same conditions selected for the direct treatment of bacterial cells does not show any noticeable adverse effect to their viability. Some considerations regarding the role of the UV radiation on the decontamination potential of bacterial cells and the viability of the eukaryotic ones will be presented. Moreover, the effects of pH variation, nitrate and nitrite concentrations of the plasma-irradiated physiological saline solution on the decontamination of bacterial suspension and on the viability of eukaryotic cells subjected to the indirect treatment will be discussed. The obtained results will be used to optimize the design of the ICP source for an effective production of reactive species, while keeping effluent temperature and UV radiation at values compatible with biomedical treatments
Synthesis of Copper-Based Nanostructures in Liquid Environments by Means of a Non-equilibrium Atmospheric Pressure Nanopulsed Plasma Jet
Get PDFThe influence of the liquid composition on the chemical and morphological properties of copper-based nanostructures synthesized by a non-equilibrium atmospheric plasma treatment is investigated and discussed. The synthesis approach is simple and environmentally friendly, employs a non-equilibrium nanopulsed atmospheric pressure plasma jet as a contactless cathode and a Cu foil as immersed anode. The process was studied using four distinct electrolyte solutions composed of distilled water and either NaCl + NaOH, NaCl only or NaOH only at two different concentrations, without the addition of any copper salts. CuO crystalline structures with limited impurities (e.g. Cu and Cu(OH)2phases) were produced from NaCl + NaOH containing solutions, mainly CuO and CuCl2structures were synthesized in the electrolyte solution containing only NaCl and no synthesis occurred in solutions containing only NaOH. Both aggregated and dispersed nanostructures were produced in the NaCl + NaOH and NaCl containing solutions. Reaction pathways leading to the formation of the nanostructures are proposed and discussed
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