Comparing efficiencies of polypropylene treatment by atmospheric pressure plasma jets

Polášková, Kateřina; Özkan, Alp; Klíma, Miloš; Jenikova, Zdenka; Buddhadasa, Madhuwanthi; Reniers, François; Zajı́čková, Lenka

doi:10.1002/ppap.202300031

Cited by 3 publications

(6 citation statements)

References 55 publications

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“…The surface resistance of the untreated samples of the second series of materials was Rp,tset = 0.082 TΩ, and Rp,tplast = 0.092 TΩ. According to the previously performed experiments (from 1996 until now [4,7,9,10,35,36,45,46]), the parameters (Figure 11) of the electric power of the exciting slot nozzle of the plasma discharge in gases, for example, were obtained based on experiments with Ar, N2, etc. to effectively influence the surface.…”

Section: Experimental Evaluation Results and Discussionmentioning

confidence: 99%

“…The expected bonds are those that are potentially able to bind an electric charge, and this results in a macroscopic increase in the interfacial strength of the modified surface, Ep. This hypothesis has already been investigated and tested in other areas of electrochemistry [45,46]. Therefore, the authors attempted to verify it by measurements, whether a change in surface strength properties could also be expected.…”

Section: Methods Of Adjusting the Electrical Strength Of Dielectrics:...mentioning

confidence: 97%

“…These changes and new formations vary both from the point of direct action of the atmospheric plasma discharge (Figure 14) and according to the chosen setting of the plasma-generating chamber mode and frequency spectrum (for example, the spectrum presented in Figure 11). A more in-depth qualitative evaluation and approximation of the process to influence the polymer surface via atmospheric plasma discharges was proposed in [45,46]. Such treatment procedures, if performed properly, induce changes not only on the surface of the dielectric in the microscopic region (Figures 12 and 13) but also at the level of the polymer molecules and atoms [45] (Figure 15).…”

Section: Methods Of Adjusting the Electrical Strength Of Dielectrics:...mentioning

confidence: 99%

“…A more in-depth qualitative evaluation and approximation of the process to influence the polymer surface via atmospheric plasma discharges was proposed in [45,46]. Such treatment procedures, if performed properly, induce changes not only on the surface of the dielectric in the microscopic region (Figures 12 and 13) but also at the level of the polymer molecules and atoms [45] (Figure 15). The surface is altered in its molecular structure and the newly formed chains cause a macroscopic change in the surface of the material (Figure 15).…”

Section: Methods Of Adjusting the Electrical Strength Of Dielectrics:...mentioning

confidence: 99%

“…process utilized a generator with the output power Pout = 10-1000 W, Uout = 300-600 V, a periodic signal, and the first harmonic f1 = 13.56 MHz (Figure 14). According to the previously performed experiments (from 1996 until now [4,7,9,10,35,36,45,46]), the parameters (Figure 11) of the electric power of the exciting slot nozzle of the plasma discharge in gases, for example, were obtained based on experiments with Ar, N2, etc., to effectively influence the surface. An example of the impact of changes in the plasma surface is shown in the images of the surface in Figure 12 under different settings of the discharge parameters.…”

Section: Methods Of Adjusting the Electrical Strength Of Dielectrics:...mentioning

confidence: 99%

See 4 more Smart Citations

Modification of Insulating Properties of Surfaces of Dielectric High-Voltage Devices Using Plasma

Pernica,

Klíma,

Londák

et al. 2024

Applied Sciences

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Plasma discharges under atmospheric pressure are applicable for modifying the electrical properties of dielectric surfaces. The aim of the plasma discharge treatment of such surfaces is to design a procedure so that its characteristic parameters improve the resulting levels of the breakdown electrical strength Eb when tested under pulsed or alternating electrical voltages. In this research, a set of functional experiments performed by using plasma in samples of two types of materials (thermoset, thermoplastic) were processed and evaluated, and the resulting effect of the magnitude of the breakdown electrical voltage, electrical intensity, and electrical conductivity of the surface were compared. A slit plasma chamber, previously described and parameterized, was employed to treat the surface of the dielectric samples. The surface structure was modified via plasma discharge without precursors, and methodologies were developed to evaluate these modifications with respect to the change in the electrical strength parameters of the insulator surface. Subsequently, the surface strength of the affected and unaffected samples was measured and evaluated as a function of exposure time, and the stability of the modification was assessed. The first methodical test showed that plasma discharge without precursors improved the long-term surface electrical strength of the dielectric surface. The test and its parameters were carried out with respect to feasibility in an industrial environment.

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Section: Experimental Evaluation Results and Discussionmentioning

confidence: 99%

Section: Methods Of Adjusting the Electrical Strength Of Dielectrics:...mentioning

confidence: 97%

Section: Methods Of Adjusting the Electrical Strength Of Dielectrics:...mentioning

confidence: 99%

Section: Methods Of Adjusting the Electrical Strength Of Dielectrics:...mentioning

confidence: 99%

Section: Methods Of Adjusting the Electrical Strength Of Dielectrics:...mentioning

confidence: 99%

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Modification of Insulating Properties of Surfaces of Dielectric High-Voltage Devices Using Plasma

Pernica,

Klíma,

Londák

et al. 2024

Applied Sciences

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The electron jet in relativistic laser-plasma with circular magnetic fields

Zhao,

Liu,

Liu

et al. 2024

AIP Advances

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Self-generated magnetic field and electron jet are observed when ultra-intense lasers (>1×1018W/cm2) interact with plasma. It is found that the self-generated magnetic field plays a significant role in the generation of electron jets. The generation mechanism of electron jets under the influence of a self-generated circular magnetic field is examined. It is revealed that magnetic modulation of self-generated magnetic fields can result in the collapse of these fields, consequently leading to the production of electron jets. Furthermore, it has been discovered that the velocity of the electron jets is associated with the maximum growth rate of the modulational instability. As the maximum growth rate of the modulational instability decreases, the velocity of the electron jets is reduced. The present work aids in getting a deeper understanding of the generation of electron jets in relativistic laser plasmas.

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Sample thickness and edge proximity influence spatial behavior of filaments and treatment uniformity of RF cold atmospheric pressure plasma jet

Polášková,

Nečas,

Dostál

et al. 2024

Preprint

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The ability of atmospheric pressure plasma jets to treat complex non-planar surfaces is often cited as their advantage over other atmospheric plasmas. However, the effect of complex surfaces on plasma parameters and treatment efficiency has seldom been studied. Herein, we investigate the interaction of the atmospheric pressure plasma slit jet (PSJ) with block polypropylene samples of different thicknesses (5 and 30 mm) moving at two different speeds. Even though the distance between the slit outlet and the sample surface was kept constant, the treatment efficiency of PSJ ignited in the Ar and Ar/O2 gas feeds varied with the sample thickness due to the plasma parameters such as filament count and speed being affected by the different distances of the ground (the closer the ground is, the higher the discharge electric field). On the other hand, the Ar/N2 PSJ diffuse plasma plumes were less affected by the changes in the electric field, and the treatment efficiency was the same for both sample thicknesses. Additionally, we observed a difference in the efficiency and uniformity of the PSJ treatment of the edges and the central areas in some working conditions. The treatment efficiency near the edges depended on the duration of the filament contact, i.e., how long the local electric field trapped the filaments. Conversely, the treatment uniformity near the edges and in the central areas was different if the number of filaments changed rapidly as the discharge moved on and off the sample (the 5 mm samples treated by easily sustained Ar PSJ).

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Comparing efficiencies of polypropylene treatment by atmospheric pressure plasma jets

Cited by 3 publications

References 55 publications

Modification of Insulating Properties of Surfaces of Dielectric High-Voltage Devices Using Plasma

Modification of Insulating Properties of Surfaces of Dielectric High-Voltage Devices Using Plasma

The electron jet in relativistic laser-plasma with circular magnetic fields

Sample thickness and edge proximity influence spatial behavior of filaments and treatment uniformity of RF cold atmospheric pressure plasma jet

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