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

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.

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Langmuir probe diagnostics of an atmospheric pressure, vortex–stabilized nitrogen plasma jet

Journal of Applied Physics ◽

10.1063/1.4752886 ◽

2012 ◽

Vol 112 (6) ◽

pp. 063302 ◽

Cited By ~ 10

Author(s):

L. Prevosto ◽

H. Kelly ◽

B. R. Mancinelli

Keyword(s):

Atmospheric Pressure ◽

Langmuir Probe ◽

Plasma Jet ◽

Nitrogen Plasma ◽

Probe Diagnostics

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

Materials ◽

10.3390/ma12020219 ◽

2019 ◽

Vol 12 (2) ◽

pp. 219 ◽

Cited By ~ 12

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.

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