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.

Enhanced bonding strength of heat-treated wood using a cold atmospheric-pressure nitrogen plasma jet

2018 ◽  
Vol 76 (6) ◽  
pp. 1697-1705 ◽  
Author(s):  
Thi Hai Van Nguyen ◽  
Tat Thang Nguyen ◽  
Xiaodi Ji ◽  
Van Dinh Nguyen ◽  
Minghui Guo
Keyword(s):  
Atmospheric Pressure ◽  
Bonding Strength ◽  
Treated Wood ◽  
Plasma Jet ◽  
Nitrogen Plasma ◽  
Heat Treated

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.

scholarly journals Development of Organosilicon-Based Superhydrophobic Coatings through Atmospheric Pressure Plasma Polymerization of HMDSO in Nitrogen Plasma

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 219 ◽  
Author(s):  
Siavash Asadollahi ◽  
Jacopo Profili ◽  
Masoud Farzaneh ◽  
Luc Stafford
Keyword(s):  
Contact Angle ◽  
Atmospheric Pressure ◽  
Plasma Polymerization ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Nitrogen Plasma ◽  
Superhydrophobic Surfaces ◽  
Atmospheric Pressure Plasma Jet ◽  
Pressure Plasma ◽  
Superhydrophobic Coatings

Water-repellent surfaces, often referred to as superhydrophobic surfaces, have found numerous potential applications in several industries. However, the synthesis of stable superhydrophobic surfaces through economical and practical processes remains a challenge. In the present work, we report on the development of an organosilicon-based superhydrophobic coating using an atmospheric-pressure plasma jet with an emphasis on precursor fragmentation dynamics as a function of power and precursor flow rate. The plasma jet is initially modified with a quartz tube to limit the diffusion of oxygen from the ambient air into the discharge zone. Then, superhydrophobic coatings are developed on a pre-treated microporous aluminum-6061 substrate through plasma polymerization of HMDSO in the confined atmospheric pressure plasma jet operating in nitrogen plasma. All surfaces presented here are superhydrophobic with a static contact angle higher than 150° and contact angle hysteresis lower than 6°. It is shown that increasing the plasma power leads to a higher oxide content in the coating, which can be correlated to higher precursor fragmentation, thus reducing the hydrophobic behavior of the surface. Furthermore, increasing the precursor flow rate led to higher deposition and lower precursor fragmentation, leading to a more organic coating compared to other cases.

scholarly journals Cold Atmospheric Pressure Nitrogen Plasma Jet for Enhancement Germination of Wheat Seeds

2019 ◽  
Vol 39 (4) ◽  
pp. 897-912 ◽  
Author(s):  
Khaled Lotfy ◽  
Nadi Awad Al-Harbi ◽  
Hany Abd El-Raheem
Keyword(s):  
Atmospheric Pressure ◽  
Plasma Jet ◽  
Nitrogen Plasma ◽  
Wheat Seeds
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