scholarly journals Influence of the β− Radiation/Cold Atmospheric-Pressure Plasma Surface Modification on the Adhesive Bonding of Polyolefins

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 76
Author(s):  
Martin Bednarik ◽  
Ales Mizera ◽  
Miroslav Manas ◽  
Milan Navratil ◽  
Jakub Huba ◽  
...  
Keyword(s):  
Surface Modification ◽  
Free Surface ◽  
Surface Energy ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Free Surface Energy ◽  
Surface Layers ◽  
Adhesive Properties ◽  
Adhesive Bonds ◽  
Cold Atmospheric Pressure Plasma

The goal of this research was to examine the effect of two surface modification methods, i.e., radiation cross-linking and plasma treatment, on the adhesive properties and the final quality of adhesive bonds of polypropylene (PP), which was chosen as the representative of the polyolefin group. Polymer cross-linking was induced by beta (accelerated electrons—β−) radiation in the following dosages: 33, 66, and 99 kGy. In order to determine the usability of β− radiation for these applications (improving the adhesive properties and adhesiveness of surface layers), the obtained results were compared with values measured on surfaces treated by cold atmospheric-pressure plasma with outputs 2.4, 4, and 8 W. The effects of both methods were compared by several parameters, namely wetting contact angles, free surface energy, and overall strength of adhesive bonds. Furthermore, Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) were conducted. According to our findings the following conclusion was reached; both tested surface modification methods significantly altered the properties of the specimen’s surface layer, which led to improved wetting, free surface energy, and bond adhesion. Following the β− radiation, the free surface energy of PP rose by 80%, while the strength of the bond grew in some cases by 290% in comparison with the non-treated surface. These results show that when compared with cold plasma treatment the beta radiation appears to be an effective tool capable of improving the adhesive properties and adhesiveness of PP surface layers.

Polyolefinic Surface Activation by Low and Atmospheric Pressure Plasma Treatments

2014 ◽  
Vol 805 ◽  
pp. 149-154
Author(s):  
M.A. Martinez ◽  
J. Abenojar ◽  
N. Encinas
Keyword(s):  
Surface Energy ◽  
Atmospheric Pressure ◽  
Cold Plasma ◽  
Atmospheric Pressure Plasma ◽  
High Strength ◽  
Atmospheric Plasma ◽  
Adhesive Bonds ◽  
Lightweight Structures ◽  
Low Surface Energy ◽  
Plasma Treatments

Polyolefins are increasingly used in the construction of lightweight structures. Due to their low surface energy, it is difficult to have a proper bond with adhesives and paints. By using cold plasma treatments, these surfaces can be activated through the formation of highly reactive functional groups that can promote high strength adhesive bonds. This paper compares the results of cold plasma treatments using two techniques (low pressure and atmospheric plasma torch) applied on polypropylene and high density polyethylene. The obtained data allow the demonstration of a higher effectiveness of atmospheric plasma, with a significant increase in surface energy in both materials.

scholarly journals Experimental Study of Cold Atmospheric Pressure Plasma Jet and Its Application in the Surface Modification of Polypropylene

2020 ◽  
Vol 8 (2) ◽  
pp. S1-S14
Author(s):  
Hom Bahadur Baniya ◽  
Rajesh Prakash Guragain ◽  
Binod Baniya ◽  
Deepak Prasad Subedi
Keyword(s):  
Surface Modification ◽  
Surface Properties ◽  
Power Supply ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Materials Processing ◽  
Atmospheric Pressure Plasma Jet ◽  
Pressure Plasma ◽  
Cold Atmospheric Pressure Plasma

The cold plasma technology is gaining popularity as one of the most effective tools for a wide range of applications. Cold atmospheric pressure plasma jet (CAPPJ) has attracted considerable attention in recent times for materials processing such as surface modification and biomedical applications. The cold atmospheric pressure plasma jet sustained in pure argon has been used here to modify the surface properties of polypropylene. CAPPJ has been generated by a high voltage power supply 5 kV at an operating frequency of 20 kHz. This paper reports the diagnostics of CAPPJ in argon environment by electrical and optical methods and its application in the surface modification of polypropylene (PP). The surface properties of the untreated and plasma-treated PP samples were characterized by contact angle measurements, surface free energy determination, scanning electron microscopy and Fourier transform infrared spectroscopy analysis. Most of the previous work has used RF power supply which is more expensive compared to the power supply used in the present study. The plasma jet is designed with locally available materials and can be used for continuous treatment for long time. We have successfully developed a plasma device that is able to generate a non-equilibrium atmospheric pressure argon plasma jet of low temperature. Therefore, a cost-effective system of generating a plasma jet at atmospheric pressure with potential applications in materials processing and biomedical research has been developed.

Fabrication and Performance of a Multidischarge Cold-Atmospheric Pressure Plasma Array

2021 ◽  
pp. 1-8
Author(s):  
Kenneth A. Cornell ◽  
Amanda White ◽  
Adam Croteau ◽  
Jessica Carlson ◽  
Zeke Kennedy ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Pressure Plasma ◽  
Cold Atmospheric Pressure Plasma ◽  
And Performance

scholarly journals Cold Atmospheric Pressure Plasma-Activated Medium Induces Selective Cell Death in Human Hepatocellular Carcinoma Cells Independently of Singlet Oxygen, Hydrogen Peroxide, Nitric Oxide and Nitrite/Nitrate

2021 ◽  
Vol 22 (11) ◽  
pp. 5548
Author(s):  
Yan Li ◽  
Tianyu Tang ◽  
Haejune Lee ◽  
Kiwon Song
Keyword(s):  
Nitric Oxide ◽  
Cell Death ◽  
Singlet Oxygen ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Proliferative Effect ◽  
Huh7 Cells ◽  
Anti Cancer ◽  
Cold Atmospheric Pressure Plasma ◽  
Nitrite Nitrate

Cold atmospheric pressure plasma (CAP) and plasma-activated medium (PAM) induce cell death in diverse cancer cells and may function as powerful anti-cancer agents. The main components responsible for the selective anti-cancer effects of CAP and PAM remain elusive. CAP or PAM induces selective cell death in hepatocellular carcinoma cell lines Hep3B and Huh7 containing populations with cancer stem cell markers. Here, we investigated the major component(s) of CAP and PAM for mediating the selective anti-proliferative effect on Hep3B and Huh7 cells. The anti-proliferative effect of CAP was mediated through the medium; however, the reactive oxygen species scavenger N-acetyl cysteine did not suppress PAM-induced cell death. Neither high concentrations of nitrite or nitrite/nitrate nor a low concentration of H2O2 present in the PAM containing sodium pyruvate affected the viability of Hep3B and Huh7 cells. Inhibitors of singlet oxygen, superoxide anions, and nitric oxide retained the capacity of PAM to induce anti-cancer effects. The anti-cancer effect was largely blocked in the PAM prepared by placing an aluminum metal mesh, but not a dielectric PVC mesh, between the plasma source and the medium. Hence, singlet oxygen, hydrogen peroxide, nitric oxide, and nitrite/nitrate are not the main factors responsible for PAM-mediated selective death in Hep3B and Huh7 cells. Other factors, such as charged particles including various ions in CAP and PAM, may induce selective anti-cancer effects in certain cancer cells.

scholarly journals Cold atmospheric pressure plasma jets as sources of singlet delta oxygen for biomedical applications

2011 ◽  
Vol 109 (12) ◽  
pp. 123302 ◽  
Author(s):  
J. S. Sousa ◽  
K. Niemi ◽  
L. J. Cox ◽  
Q. Th. Algwari ◽  
T. Gans ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Biomedical Applications ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jets ◽  
Pressure Plasma ◽  
Cold Atmospheric Pressure Plasma
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