Surface Treatment of Polymer Film by Atmospheric Pulsed Microplasma: Study on Gas Humidity Effect for Improving the Hydrophilic Property

Abstract

Surface treatment of a poly(ethylene naphthalate) (PEN) film by atmospheric pulsed microplasma with humid Ar gas was experimentally investigated. A Marx generator with metal–oxide–semiconductor field-effect transistor (MOSFET) switches that generates negative pulses was used for generating microplasma. Hydrophilization was estimated by measuring contact angle before and after the microplasma surface treatment by a remote process. The initial contact angle was about 76°. The minimum contact angle of about 20° was obtained after a treatment, a discharge voltage of -1.3 kV negative pulse, a frequency of 24 kHz, a gas relative humidity of about 60%. Analysis by X-ray photoelectron spectroscopy (XPS) showed a decrease in the C 1s peak corresponding to the C–H bond or C–C bond, and increases in the O 1s peaks corresponding to the C=O bond or O–H bond.

Characteristics of a novel nanosecond DBD microplasma reactor for flow applications

“…They are of interest because of their high energy efficiency and high selectivity. Therefore, they have a strong potential in applications like surface treatment [1], thin film deposition [2], detoxification of gaseous pollution [3,4], plasma medicine [5] and ozone generation [6]. Many different designs have been tried to generate a stable non-thermal plasma discharge in a flow reactor at pressures up to one atmosphere.…”

Study of Sterilization and Disinfection in Room Air by Using Atmospheric Microplasma

“…Due to small discharge gaps (0~100) μm and to the assumed specific dielectric constant of 10 4 , a high intensity electric field (10 7~1 0 8 V/m) could be obtained with relatively low discharge voltages around 1 kV. Streamers were generated between the electrodes as shown in Figure 1(b) and 1(c), which generate various radicals and ions that could affect a target surface [18,19,21]. Figure 3 shows the experimental setup for sterilization or disinfection of the airborne bacteria.…”

“…Operation frequency depends on the power supply; few kHz to tens of kHz would be suitable for power supply without any heat problem. Microplasma could apply for various applications not only indoor air cleaning, odor control, but also surface treatment or medical field because of the above mentioned advantages [18][19][20][21].…”

Towards three-dimensional nanoarchitectures: highly ordered bi-layer assembly of tailored magnetic nanowire arrays via template-assisted electrodeposition

“…However, these fabrication techniques are limited by the surface area of the planar substrate as nanopatterning inherits the area coverage from the porous templates, consequently restraining improvement in NW density and SA : V ratios for 3D memory, 27 which relies on increased wire density. 28 To overcome this problem, we have used (AAO) template-assisted electrodeposition to fabricate three-dimensional vertical assemblies of ultra-dense arrays of freestanding magnetic NWs where morphology, chemical composition, crystal structure, and magnetic behaviors can be tailored in a layer-by-layer basis. We demonstrate this method by fabricating two bi-layer assemblies of Ni (sample 1) and Co/Ni (sample 2) NW arrays on 3 × 15 mm 2 Au/Si (100) substrates where complete and uniform coverage is achieved.…”