Surface modification of Raw and Frit glazes by non-thermal helium plasma jet

Ghasemi, Maede; Sohbatzadeh, Farshad; Mirzanejhad, Saeed

doi:10.1007/s40094-015-0176-6

Cited by 7 publications

(10 citation statements)

References 21 publications

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“…Limitations in conventional sterilization methods have motivated the search for novel sterilization methods. In recent years, plasmas have various promising applications such as treatment of mammalian and cancerous cells [16], sterilization [8], bacteria inactivation [25], surface modification of Raw and Frit glazes [11], silicon rubber surface modification [26], protein destruction [6] blood coagulations [17], treatment of living tissue [7], wound care [21], teeth bleaching [19], and treatment of dental diseases [15].…”

Section: Introductionmentioning

confidence: 99%

Inactivation of Aspergillus flavus spores in a sealed package by cold plasma streamers

et al. 2016

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The main objective of this study is to investigate the inactivation efficacy of cold streamers in a sealed package on pathogenic fungi Aspergillus flavus (A. flavus) spores that artificially contaminated pistachio surface. To produce penetrating cold streamers, electric power supply was adapted to deposit adequate power into the package. The plasma streamers were generated by an alternating high voltage with carrier frequency of 12.5 kHz which was suppressed by a modulated pulsed signal at frequency of 110 Hz. The plasma exposition time was varied from 8 to 18 min to show the effect of the plasma treatment on fungal clearance while the electrode and sample remained at room temperature. This proved a positive effect of the cold streamers treatment on fungal clearance. Benefits of deactivation of fungal spores by streamers inside the package include no heating, short treatment time and adaptability to existing processes. Given its ability to ensure the safety and longevity of food products, this technology has great potential for utilization in food packaging and processing industry. In this study, moisture and pH changes of pistachio samples after plasma streamers treatment were also investigated.

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Section: Introductionmentioning

confidence: 99%

Inactivation of Aspergillus flavus spores in a sealed package by cold plasma streamers

et al. 2016

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“…In the plasmas, the energetic electrons produced during the discharge collide with the background helium atoms and stimulate the generation of excited and metastable helium atoms, which plays a vital role in initiating many chemical reactions in the plasma channel, viz.,

He + e \to {normalHe}^{*} false(2p false) + e

He + e \to {normalHe}^{*} false(2S false) + e

Helium atomic line of 706 nm [3 3 S → 2 3 P], with the threshold excitation energy of 22.7 eV is an indicator of the presence of energetic electrons in the discharge and which is also the most intense spectral line in the helium plasma jet emission spectrum, shown in Figure 3a. In comparison with the other He emission lines in the 200–900 nm wavelength range, 706 nm has the smallest excitation energy [ 41,42 ] ; thus, intense emission occurs. [ 42,43 ] The other helium atomic lines noticed are 587.6 nm (3 3 D → 2 3 P), 667.8 nm (3 1 D → 2 1 P), and 728.1 nm (3 1 S → 2 1 P).…”

Section: Resultsmentioning

confidence: 99%

“…In comparison with the other He emission lines in the 200–900 nm wavelength range, 706 nm has the smallest excitation energy [ 41,42 ] ; thus, intense emission occurs. [ 42,43 ] The other helium atomic lines noticed are 587.6 nm (3 3 D → 2 3 P), 667.8 nm (3 1 D → 2 1 P), and 728.1 nm (3 1 S → 2 1 P). A helium atom naturally has two metastable levels, which are 2 1 S 0 (singlet) and 2 3 S 1 (triplet), with energies of 19.8 and 20.6 eV, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Two intense spectral lines of N 2 + first negative system

[{normal∑}_{u}^{+} \to X^{2} {normal∑}_{g}^{+}]

at the wavelengths of 391.44 and 427.8 nm are the other prominent productions of the discharge which are the indicators of helium metastable presence. [ 42 ] OH

[A^{2} {normal∑}^{+} \to X^{2} π Π]

at 308 nm are the other discharge productions present as the result of water vapour (present in the air) dissociation (H 2 O + e → OH + H + e ), which is also labelled in Figure 3a.…”

Section: Resultsmentioning

confidence: 99%

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Influence of pulse modulation frequency on helium RF atmospheric pressure plasma jet characteristics

Mahreen

Prakash

Kar

et al. 2022

Contributions to Plasma Physics

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This work investigates the influence of pulse modulation frequency ranging from 50 Hz–10 kHz on the helium RF atmospheric pressure plasma jet's fundamental characteristics. The impact of modulation frequency on plasma jet discharge behaviour, geometrical variation, reactive species emission, and plasma parameters (gas temperature Tg, electron excitation temperature Texc, and electron density (ne)) are studied using various diagnostics such as optical imaging, emission spectra, and thermal diagnostic. From the experiments, it is observed that operating the plasma jet at low pulse modulation frequencies (around 50 Hz) provides enhanced plasma dimensions, higher electron densities and greater optical emission from reactive species (viz., He I, O, OH, N2+, etc.) as compared to the higher modulation frequencies. Besides the low power consumption, three times less gas temperature of the modulated plasma jet than the continuous wave mode makes it more advantageous for the applications. Moreover, the influence of duty cycle (D) and applied RF power (P) on the plasma jet characteristics are also discussed. It is found that 10–40% duty cycle operation provides the most favourable attributes. More importantly, the concern of shorter plasma length in RF plasma jets is overcome by operating at 10–20% duty cycle with increased applied power. This work thoroughly characterizes helium atmospheric pressure RF plasma jet with a wide range of pulse mode operating parameters, which could help to select appropriate operating conditions for various industrial and biomedical applications.

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“…As compared to the other types of gas discharge, the simplicity in the configuration and absence of the vacuum system of the DBD are obvious advantages for consideration of industrial applications. DBDs are used in many industrial applications, such as ozone generation [1,2], decontamination [3,4], lighting especially of UV light generation by means of DBD excimer lamps [5,6], the manufacture of plasma display cells [7], modification and surface treatment [8][9][10][11] and semiconductor manufacturing. This type of discharge can be produced when at least one of the electrodes is covered by a dielectric layer, such as glass, quartz or ceramics.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of a DBD in glow mode at atmospheric pressure

Saridj

Belarbi

2019

J Theor Appl Phys

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In this work, a fluid model of helium glow discharge at atmospheric pressure in a dielectric barrier discharge configuration has been developed and the discharge was numerically simulated. The transport equations for charged and excited species are self-consistent coupled to the Poisson equation for the electrical field calculation. A finite difference method technique is adopted; a detailed numerical procedure modeling is given. The addition of some nitrogen impurities to the helium successfully reproduced the discharge evolution during the breakdown. The numerical results showed that the discharge has a structure similar to DC low-pressure glow discharges and confirms the establishment of the glow regime at atmospheric pressure under very adequate conditions. The profiles of physical and electrical discharge parameters knowing that, particle densities, electric field, drift velocity, voltages and discharge current are presented and analyzed. A detailed study was made of the effect of nitrogen impurities on the stability of the glow mode of the discharge, and on the evolution of its parameters.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Surface modification of Raw and Frit glazes by non-thermal helium plasma jet

Cited by 7 publications

References 21 publications

Inactivation of Aspergillus flavus spores in a sealed package by cold plasma streamers

Inactivation of Aspergillus flavus spores in a sealed package by cold plasma streamers

Influence of pulse modulation frequency on helium RF atmospheric pressure plasma jet characteristics

Numerical modeling of a DBD in glow mode at atmospheric pressure

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