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Contact angle [Deg.]
90
80
70
60
50
40
0 20 40 60 80 100
Distance from the orifice [mm]
Figure 4. Water contact angle of the PE film as
a function of distance from the orifice of APPJ.
The gas flow rate was 3.0 l min -1 and the exposure
time was 10 s.
Figure 4 shows the water contact angle of the
PE film as a function of distance from the orifice
of APPJ. In order to investigate the effectiveness of
PE surface modification by the APPJ, hydrophilicity
tests were carried out on the PE films before and after
the treatment. At least three drops of the test liquids
were placed on the sample and the contact angles
were measured from the profile of the drops. The
untreated sample had contact angle of 98º with water.
Whereas after the exposure to the jet, a minimum
contact angle of 39º was measured for sample placed
at a distance of 5 mm from the orifice for a time of
10 s. For the same exposure time, a contact angle of
82º was measured when the sample was placed at a
distance of 100 mm from the orifice.
Figure 5 shows the contact angle of PE sample
as a function of the exposure time in APPJ. The
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Contact angle [deg.]
REFERENCES
100
90
80
70
60
50
40
treatment time ranged from 1 s to 12 s. As shown in
the figure, the contact angle of the film changed from
98º for the untreated to the lowest value of 43º after
the treatment.
CONCLUSION
0 2 4 6 8 10 12
Exposure time [s]
Figure 5. Water contact angle of PE sample as
a function of the exposure time in APPJ. The
distance of the sample from the orifice was 5 mm
and the gas flow rate was 3.0 l/min.
An atmospheric pressure plasma jet has been
developed and tested. The irradiation of the jet onto
the polymer surface can improve the hydrophilicity
of the sample without any damage to the material.
The advantages of the present jet system are that the
power consumption is low and there is no need of
matching network. This plasma source can be used
for the treatment of non-planar surface and heat
sensitive materials.
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Journal of Science and Technology in the Tropics (2010) 6: 49-52