scholarly journals Characterization Of Dielectric Barrier Discharge (DBD) Produced In Air At Atmospheric Pressure And Its Application In Surface Modification Of High-Density Polyethylene (HDPE)

2020 ◽  
Vol 1 (1) ◽  
pp. 27-35
Author(s):  
Rajesh Prakash Guragain ◽  
H B Baniya ◽  
S Dhungana ◽  
S Gautam ◽  
B P. Pandey ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Surface Energy ◽  
Dielectric Barrier Discharge ◽  
High Density Polyethylene ◽  
Barrier Discharge ◽  
Sem Analysis ◽  
High Density ◽  
Optical Methods ◽  
Dielectric Barrier

The low surface energy of HDPE limits its industrial uses as it is not suitable for printing and adhesion. The main aim of this work is to improve the wetting properties of high-density polyethylene (HDPE) using air dielectric barrier discharge (DBD) operating at the line frequency (50 Hz). The estimation of electron temperature and electron density has been done by electrical and optical methods. The surface roughness of the control and plasma treated polymer film is analysed by contact angle (CA) measurement, surface energy measurement and scanning electron microscope (SEM) analysis. The contact angle was found to be suppressed from 93.180±2.00 to 63.750±0.880 after 10s of plasma treatment which implied that the surface property had changed to a hydrophilic state caused by an increase in the surface roughness.

scholarly journals Study of High-Density Polyethylene (HDPE) Kinetics Modification Treated by Dielectric Barrier Discharge (DBD) Plasma

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2422
Author(s):  
João Freire de Medeiros Neto ◽  
Ivan Alves de Souza ◽  
Michelle Cequeira Feitor ◽  
Talita Galvão Targino ◽  
Gutembergy Ferreira Diniz ◽  
...  
Keyword(s):  
Contact Angle ◽  
Dielectric Barrier Discharge ◽  
High Density Polyethylene ◽  
Barrier Discharge ◽  
Sessile Drop ◽  
Attenuated Total Reflection ◽  
High Density ◽  
Material Surface ◽  
Dielectric Barrier ◽  
Physicochemical Changes

In this work, the plasma was used in the dielectric barrier discharge (DBD) technique for modifying the high-density polyethylene (HDPE) surface. The treatments were performed via argon or oxygen, for 10 min, at a frequency of 820 Hz, voltage of 20 kV, 2 mm distance between electrodes, and atmospheric pressure. The efficiency of the plasma was determined through the triple Langmuir probe to check if it had enough energy to promote chemical changes on the material surface. Physicochemical changes were diagnosed through surface characterization techniques such as contact angle, attenuated total reflection to Fourier transform infrared spectroscopy (ATR-FTIR), X-ray excited photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). Plasma electronics temperature showed that it has enough energy to break or form chemical bonds on the material surface, impacting its wettability directly. The wettability test was performed before and after treatment through the sessile drop, using distilled water, glycerin, and dimethylformamide, to the profile of surface tensions by the Fowkes method, analyzing the contact angle variation. ATR-FTIR and XPS analyses showed that groups and bonds were altered or generated on the surface when compared with the untreated sample. The AFM showed a change in roughness, and this directly affected the increase of wettability.

scholarly journals Effect of dielectric barrier discharge on conductive properties for epoxy/copper composite

2021 ◽  
Vol 2114 (1) ◽  
pp. 012042
Author(s):  
Sarah Faris Khaleel ◽  
Qusay Adnan Abbas
Keyword(s):  
Electrical Conductivity ◽  
Surface Roughness ◽  
Dielectric Barrier Discharge ◽  
Efficient Method ◽  
Barrier Discharge ◽  
Energy Gap ◽  
Dbd Plasma ◽  
Dielectric Barrier ◽  
Copper Composite ◽  
Conductive Properties

Abstract The plasma treatment efficient method used improving and Surface treatment of epoxy and increasing the surface roughness. In this paper, epoxy and epoxy/copper are modified by dielectric barrier discharge (DBD) Plasma in presence of air. Modification of the properties of epoxy by preparing doping systems with percentage 1% copper with two different frequencies of the plasma f=7 and 8 kHz and exposure time t =10 min. The results showed a decrease in the energy gap when exposed to plasma and an increase in the surface roughness of epoxy, electrical conductivity of composites increased with temperature.

scholarly journals The Changes in Electrical and Interfacial Properties of Polyimide Exposed to Dielectric Barrier Discharge in SF6Medium

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Hafiz Z. Alisoy ◽  
Murat Koseoglu
Keyword(s):  
Surface Energy ◽  
Charge Density ◽  
Surface Charge ◽  
Dielectric Barrier Discharge ◽  
Formation Mechanism ◽  
Surface Charge Density ◽  
Barrier Discharge ◽  
Depolarization Current ◽  
Dielectric Barrier ◽  
Space Charges

The formation mechanism of space charges in polyimide (PI) which was exposed to dielectric barrier discharge (DBD) in SF6medium and the effects of the space charges on interfacial and electrical properties of PI were investigated. The variation of normalized surface charge density on PI sample was calculated and illustrated for different DBD exposure times. The surface potential was measured to determine the effect of the space charges on the sample. Then, the contact angle values were measured to obtain the relation between the surface energy and the surface charge density. The expressions for the total charge and the concentration of trapped electrons were derived by using Poisson and continuity equations at stationary state. The space charges were determined experimentally by using thermally stimulated depolarization current (TSDC) method. Also, SEM image and FTIR spectrum of virgin and treated samples were presented to observe the structural variations. It was seen that the approach for the formation mechanism of the space charges agreed with the experimental data. However, it was concluded particularly for the short-time DBD treatments that the space charges accumulated in the sample should be considered besides the effects of surface functionalization in the determination of the surface energy.

scholarly journals An Investigation of the Effect of Electrode Geometry and Frequency of Power Supply in the Homogeneity of Dielectric Barrier Discharge in Air

1970 ◽  
Vol 6 (1) ◽  
pp. 96-101 ◽  
Author(s):  
RB Tyata' ◽  
DP Subedi
Keyword(s):  
Contact Angle ◽  
Dielectric Barrier Discharge ◽  
Barrier Discharge ◽  
Polymer Surface ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Electrode Geometry ◽  
Dielectric Barrier ◽  
Digital Oscilloscope ◽  
Measurement Surface

An experimental investigation of dielectric barrier discharge (DBD) produced in air isreported in the present paper. The discharge was produced by applying 0?20 kV AC source atfrequency 10?30 kHz. The main objective of the study was to investigate the dependence ofthe discharge homogeneity on the frequency of applied source and the geometry of theelectrodes. For this propose, three different types of electrodes were used. The discharge wassystematically investigated on an extended range of electrical parameters using highfrequency digital oscilloscope. Non-thermal nature of the discharge was tested by thetreatment of hydrophobic polymer surface by measuring the change in contact angle withwater drops.Key words: DBD; electrode geometry; contact angle measurement; surface treatmentDOI: 10.3126/kuset.v6i1.3316 Kathmandu University Journal of Science, Engineering and Technology Vol.6(1) 2010, pp96-101

The effect of CH4/H2 ratio on the surface properties of HDPE treated by CHx ion beam bombardment

2016 ◽  
Vol 30 (17) ◽  
pp. 1650214 ◽  
Author(s):  
Wanyu Ding ◽  
Yuanyuan Guo ◽  
Dongying Ju ◽  
Susumu Sato ◽  
Teruo Tsunoda
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Surface Properties ◽  
Chemical Bond ◽  
High Density Polyethylene ◽  
Ion Beam ◽  
High Density ◽  
Static Contact Angle ◽  
Structures And Properties ◽  
Static Contact

The surface of high density polyethylene (HDPE) substrate was bombarded by the CH[Formula: see text] group ion beam, which was generated by the mixture of CH4/H2. Varying the CH4/H2 ratio, HDPE surfaces with different chemical bond structures and properties were obtained. Raman and XPS results show that [Formula: see text] and [Formula: see text] bond structures are formed at HDPE surface bombarded by CH[Formula: see text] group ions. The [Formula: see text] bond fraction at bombarded HDPE surface depends on the H2 ratio in CH4/H2 mixture, because the H ion/atom/molecule can improve the growth of [Formula: see text] bond structure. For HDPE surface bombarded by CH4/H2 = 50/50, [Formula: see text] bond fraction reaches the maximum of 30.5%, the surface roughness decreases to 17.04 nm, and the static contact angle of polar H2O molecule increased to 140.2[Formula: see text].

scholarly journals Surface modification of polyamide by 50 Hz dielectric barrier discharge (DBD) produced in air at atmospheric pressure

BIBECHANA ◽  
2021 ◽  
Vol 18 (1) ◽  
pp. 19-25
Author(s):  
Rajesh Prakash Guragain ◽  
Hom Bahadur Baniya ◽  
Santosh Dhungana ◽  
Bishnu Prasad Pandey ◽  
Ujjwal Man Joshi ◽  
...  
Keyword(s):  
Contact Angle ◽  
Surface Modification ◽  
Dielectric Barrier Discharge ◽  
Atmospheric Pressure ◽  
Barrier Discharge ◽  
Treatment Time ◽  
Industrial Applications ◽  
Polar Component ◽  
Water Contact ◽  
Dielectric Barrier

Industrial applications of the dielectric barrier discharge (DBD) have a long tradition. However, lack of understanding in some of its fundamental issues, such as the stochastic behaviors, is still a challenge for DBD researchers. The work was carried out at line frequency, 15 kV and at atmospheric pressure. This work focuses on the study of the electrical and optical characteristics of DBD at atmospheric pressure to determine a suitable condition for utilization of the device for surface modification of polyamides (PA) (Nylon 6/6). In this work, films were treated by dielectric barrier discharge and the effects on the morphology and chemistry of the material was studied. Surface characteristics were examined via contact angle measurements and SEM. The wettability tests revealed the improvement of the hydrophilic character of the surface of polyamide films as the water contact angle measured after the plasma treatments significantly decreased. The corresponding changes of the total surface energy revealed a significant increase in its polar component. The improvement of the wettability of PA strongly depends on the treatment time. The outcomes of the experiments proved that the modification of surface properties via plasma treatment reach to its saturation point after certain treatment time thus reducing the necessity of further treatment. BIBECHANA 18 (2021) 19-25

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