Simple Atmospheric-Pressure Nonthermal Plasma-Jet System for Poly(dimethylsiloxane) Bonding Process

Abstract

In this paper, we propose a simple nonthermal plasma-jet system operated at atmospheric pressure. To evaluate the capability of surface modification, we performed an experimental study on the surface modification of poly(dimethylsiloxane) (PDMS) using Ar, He, and N2 plasma jets. The contact angles of a water droplet were measured after the surface modification by the proposed system. Among the three types of plasma used, the nitrogen plasma is the most efficient for surface modification. The N2 plasma-jet treatment for 60 s decreased the contact angle of PDMS to about 30°. The hydrophilic property of the modified surface lasted for at least 3 days. The PDMS modified with the nitrogen plasma is bonded well with glass. The bonding strength is equivalent to the yield strength of PDMS.

Targeting Cancer Cells with Reactive Oxygen and Nitrogen Species Generated by Atmospheric-Pressure Air Plasma

“…The micro plasma jet system operated at atmospheric pressure can produce chemically active species, particularly oxygen and nitrogen atoms [21] . In this study, we first employed optical emission spectrum analysis to identify the particles and radicals generated by the air plasma system ( Figure 1a–b ), which can mediate the effects of air plasma in cancer cells [2] , [22] .…”

Cell death induced by ozone and various non-thermal plasmas: therapeutic perspectives and limitations

“…The designed system enables the chemical composition of the plasma to easily change with the application of distinct gases (air, helium, nitrogen, etc.). Generally, the plasma jet system operated under a specific atmospheric pressure is able to generate a variety of chemically active species, particularly oxygen and nitrogen atoms 8 9 26 . Different types of plasma devices (dielectric barrier discharge (DBD) or direct plasma generators) are also known to be used in biomedical applications.…”

Comparison Between Conventional and Transferred DBD Plasma Jets for Processing of PDMS Surfaces

“…Modifications in the polymer surface roughness that can be associated with better adhesion were also observed for various polymeric materials treated with plasmas [15], [20]- [22]. For the case of PDMS, earlier works reported changes in the surface morphology and/or creation of functional groups in the surface after treatments using atmospheric pressure plasmas with different gases [10], [12], [13], [23]- [26]. It was reported that atmospheric pressure plasma jets change the surface chemistry of PDMS replacing methyl groups (Si-CH3) by hydrophilic silanol groups (Si-OH), and also reducing its surface roughness [10], [24], [25].…”