Improving the Interfacial Properties of Para Aramid Fibers by Surface Treatment via Plasma Jet Method in Atmospheric Pressure

2020 ◽  
Author(s):  
Mojtaba Sarafpour ◽  
Izadyar Ebrahimi ◽  
Nadia Rahimi Tanha
Keyword(s):  
Atmospheric Pressure ◽  
Treatment Time ◽  
Moisture Sorption ◽  
Volume Ratio ◽  
Plasma Jet ◽  
Interfacial Properties ◽  
Aramid Fibers ◽  
Sem Images ◽  
Oh Groups ◽  
Pull Out

Various methods have been used by the researchers in order to improve the interfacial adhesion of para aramid fibers. In the present research, poly para-phenylene terephthalamide (PPTA) fibers were treated by an innovative method through the utilization of plasma jet in atmospheric pressure using a mixture of oxygen and argon as inlet gases. The effect of the volume ratio of O2/Ar and the treatment time were investigated on the interfacial properties of the fibers via SEM, AFM, ATR-FTIR analyses, and moisture sorption as well as the mechanical tests. SEM images demonstrated significant effect on the surface morphology of the fibers. In addition, ATR-FTIR spectra resulted in the creation of COOH, NH2, and OH groups on the surface of fibers. The increase in the surface functionality led to an improvement in the surface adhesion of the fibers, as observed from the pull-out tests (a maximum of 31% improvement) and moisture sorption tests (a maximum of 54% improvement). According to the results of the tensile and pull-out tests via the design expert software, the optimum condition predicted that using atmospheric pressure plasma jet employing O2/Ar volume ratio of 45.54/54.46 % for 20 minutes results the best adhesion between the fibers and resin.

Wettability modification of heat-treated wood (HTW) via cold atmospheric-pressure nitrogen plasma jet (APPJ)

Holzforschung ◽  
2017 ◽  
Vol 72 (1) ◽  
pp. 37-43 ◽  
Author(s):  
Tat Thang Nguyen ◽  
Xiaodi Ji ◽  
Thi Hai Van Nguyen ◽  
Minghui Guo
Keyword(s):  
Atmospheric Pressure ◽  
Treatment Time ◽  
Treated Wood ◽  
Plasma Jet ◽  
Nitrogen Plasma ◽  
Sem Images ◽  
Heat Treated ◽  
Advancing Contact Angle ◽  
Scanning Electron

AbstractThe modification of heat-treated wood (HTW) wettability by cold atmospheric-pressure nitrogen plasma jet (APPJ) for several treatment durations has been investigated. The effects of the modification were assessed by measurement of the advancing contact angle (ACA) of water along with determination of surface free energy. Additionally, the morphology and chemical changes of the HTW surface were characterized by scanning electron microscope (SEM) and FTIR spectroscopy. As expected, the measurements demonstrated that the ACA decreased proportionally with treatment time of APPJ. The optimal treatment time was 20 s. Clear etching traces are visible on the SEM images of HTW surfaces. The roughness of HTW increased after plasma treatment. FTIR spectra demonstrate that OH, C=O, and COOH groups are formed on the HTW surfaces. All these modifications are beneficial for the HTW wettability, which leads to better bonding strength of HTW.

Influence of Plasma Treatment on Size Adhesion Strength to Raw Cotton Yarns

2013 ◽  
Vol 477-478 ◽  
pp. 1373-1377
Author(s):  
Shi Yuan Sun ◽  
Chun Hong Fu ◽  
Xiao Ying Wei
Keyword(s):  
Adhesion Strength ◽  
Atmospheric Pressure ◽  
Treatment Time ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Cotton Fibers ◽  
Cotton Yarn ◽  
Atmospheric Pressure Plasma Jet ◽  
Cotton Yarns ◽  
Sample Distance

This study systematically investigated how helium and oxygen (He/O2) atmospheric pressure plasma jet (APPJ) treatment influences the size adhesion strength (SAS) to the cotton yarn. Results show that the SAS increases with the treatment time from 0 to 18 s then decreases until 24s. The SAS has a decreasing trend when the jet to sample distance (JTSD) goes up from 1.5 to 6.0 mm and it increases with the rising of O2 flux from 0.1 to 0.3 L/min then decreases until 0.45 L/min. For samples with different moisture regains (MRs) of 0.5%, 9.3% and 26.3%, the SAS decreases as the MR rises up. SEM and XPS analyses show that APPJ treated samples have roughened surfaces and are introduced polar bonds such as COH, C=O and OC=O. Cotton fibers with lower MRs are more efficiently etched and more polar bonds are imparted by the APPJ treatment.

scholarly journals Development of a Multihole Atmospheric Plasma Jet for Growth Rate Enhancement of Broccoli Seeds

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1134
Author(s):  
Khattiya Srakaew ◽  
Artit Chingsungnoen ◽  
Waraporn Sutthisa ◽  
Anthika Lakhonchai ◽  
Phitsanu Poolcharuansin ◽  
...  
Keyword(s):  
Growth Rate ◽  
Atmospheric Pressure ◽  
Seed Treatment ◽  
Treatment Time ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Atmospheric Plasma ◽  
Atmospheric Pressure Plasma Jet ◽  
Pressure Plasma ◽  
Significant Difference

This work aims to develop a multihole atmospheric pressure plasma jet (APPJ) device to increase the plasma area and apply it to a continuous seed treatment system. Broccoli seed was used to study the effects of an atmospheric pressure plasma jet on seed germination and growth rate. An argon flow rate of 4.2 lpm, a plasma power of 412 W, and discharge frequency of 76 kHz were used for seed treatment. The contact angle decreased strongly with the increase in treatment time from 20 s to 80 s. The broccoli seed’s outer surface morphology seemed to have been slightly modified to a smoother surface by the plasma treatment during the treatment time of 80 s. However, the cross-sectional images resulted from Synchrotron radiation X-ray tomographic microscopy (SRXTM) confirmed no significant difference between seeds untreated and treated by plasma for 80 s. This result indicates that plasma does not affect the bulk characteristics of the seed but does provide delicate changes to the top thin layer on the seed surface. After seven days of cultivation, the seed treated by plasma for 30 s achieved the highest germination and yield.

scholarly journals Direct and Indirect Bactericidal Effects of Cold Atmospheric-Pressure Microplasma and Plasma Jet

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2523
Author(s):  
Ahmad Guji Yahaya ◽  
Tomohiro Okuyama ◽  
Jaroslav Kristof ◽  
Marius Gabriel Blajan ◽  
Kazuo Shimizu
Keyword(s):  
Atmospheric Pressure ◽  
Treatment Time ◽  
Effective Means ◽  
Plasma Jet ◽  
Bacterial Inactivation ◽  
Log Reduction ◽  
Ac Power ◽  
Vis Spectroscopy ◽  
Cutibacterium Acnes ◽  
Bactericidal Effects

The direct and indirect bactericidal effects of dielectric barrier discharge (DBD) cold atmospheric-pressure microplasma in an air and plasma jet generated in an argon-oxygen gas mixture was investigated on Staphylococcus aureus and Cutibacterium acnes. An AC power supply was used to generate plasma at relatively low discharge voltages (0.9–2.4 kV) and frequency (27–30 kHz). Cultured bacteria were cultivated at a serial dilution of 10−5, then exposed to direct microplasma treatment and indirect treatment through plasma-activated water (PAW). The obtained results revealed that these methods of bacterial inactivation showed a 2 and 1 log reduction in the number of survived CFU/mL with direct treatment being the most effective means of treatment at just 3 min using air. UV–Vis spectroscopy confirmed that an increase in treatment time at 1.2% O2, 98.8% Ar caused a decrease in O2 concentration in the water as well as a decrease in absorbance of the peaks at 210 nm, which are attributed NO2− and NO3− concentration in the water, termed denitratification and denitritification in the treated water, respectively.

Effect of Atmospheric Pressure Argon Plasma Jet on the Growth of Bread Molds

2016 ◽  
Vol 675-676 ◽  
pp. 744-748 ◽  
Author(s):  
Panakamon Deeyai ◽  
Plaimein Amnuaycheewa ◽  
Pansak Kerdtongmee
Keyword(s):  
Atmospheric Pressure ◽  
Treatment Time ◽  
Power Level ◽  
Argon Plasma ◽  
Fungal Growth ◽  
Plasma Jet ◽  
Dry Weight ◽  
Wheat Bread ◽  
Whole Wheat Bread ◽  
Argon Plasma Jet

Atmospheric pressure plasma is potential to inhibit microbial growth on various food surfaces without affecting product bulk and leave no significant chemical residues. The aim of this work was to study the effect of atmospheric pressure argon plasma on the mold growth on white flour wheat bread and whole wheat bread. Aspergillus sp., was isolated from the two breads and inoculated on potato dextrose agar (PDA) and was directly exposed to argon plasma jet treatment at powers of 10, 20, or 40W for 5 or 10 min. Fungal dry weight determination was used to study the effect of APJ on the inactivation of the molds on the breads. The results showed there is a correlation between power level and treatment time. The higher the power and the longer the treatment time, the higher the degree of fungal inactivation. The amounts of the molds were significantly reduced after plasma treatment, especially in power of 40 W for 10 min. These results demonstrated that argon plasma jet could be used effectively to inhibit the fungal growth on bread surface.

scholarly journals Investigation of Surface Modification of Polystyrene by a Direct and Remote Atmospheric-Pressure Plasma Jet Treatment

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2435
Author(s):  
Alenka Vesel ◽  
Gregor Primc
Keyword(s):  
Functional Groups ◽  
Atmospheric Pressure ◽  
Treatment Time ◽  
Polymer Surface ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Contact Angles ◽  
Surface Wettability ◽  
Atmospheric Pressure Plasma Jet ◽  
Pressure Plasma

Localized functionalization of polymer surface with an atmospheric-pressure plasma jet was investigated at various treatment conditions. Polystyrene samples were treated with the plasma jet sustained in argon under direct or remote conditions. The two-dimensional evolution of surface wettability and the spot size of the treated area was determined systematically by measuring apparent water contact angles. Modification of surface chemistry and the formation of functional groups were investigated by X-ray photoelectron spectroscopy (XPS). The saturation of surface wettability and functional groups was observed even after a second of treatment providing the sample was placed close to the exhaust of the discharge tube. The spot diameter of the modified area increased logarithmically with increasing treatment time. However, it decreased linearly when increasing the distance. At the edge of the glowing plasma, however, the modification of surface properties was more gradual, so even 30 s of treatment caused marginal effects. With a further increase in the distance from the edge of the glowing plasma, however, there were no further treatment effects. The results are explained by significant axial as well as radial gradients of reactive species, in particular hydroxyl radicals.

scholarly journals Colour Fading of Textile Fabric by Plasma Treatment

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
H. F. Cheung ◽  
C. W. Kan ◽  
C. W. M. Yuen ◽  
J. Yip ◽  
M. C. Law
Keyword(s):  
Plasma Treatment ◽  
Atmospheric Pressure ◽  
Treatment Condition ◽  
Treatment Time ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Reactive Dye ◽  
Reactive Blue 19 ◽  
Fading Effect ◽  
Textile Fabric

Colour fading of a reactive dye (C.I. Reactive Blue 19) dyed textile fabric was performed by atmospheric pressure plasma (APP) treatment with the use of plasma jet. Under the APP treatment condition of treatment time = 5 sec/mm; ignition power = 160 W; oxygen concentration = 1%; jet distance = 3 mm, significant colour-fading effect was achieved. For comparison purpose, the reactive dye dyed textile fabric was subjected to conventional enzymatic colour-fading process. Experimental results revealed that the APP-induced colour-fading effect was comparable with conventional enzymatic colour-fading process.

Effect of Atmospheric-Pressure Helium Plasma Jet on Cell Culture Medium

2013 ◽  
Vol 133 (5) ◽  
pp. 278-285
Author(s):  
Norimitsu Takamura ◽  
Douyan Wang ◽  
Takao Satoh ◽  
Takao Namihira ◽  
Hisato Saitoh ◽  
...  
Keyword(s):  
Cell Culture ◽  
Atmospheric Pressure ◽  
Culture Medium ◽  
Plasma Jet ◽  
Helium Plasma ◽  
Cell Culture Medium
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