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KMID : 1011420180230040491
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Journal of Korean Ophthalmic Optics Society
2018 Volume.23 No. 4 p.491 ~ p.496
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A Study on the Surface Properties of RGP Lens by Changing Power in Low-temperature Atmospheric-pressure Plasma Surface Treatment
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Park Moon-Chan
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Abstract
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Purpose: This study was conducted to observe the surface properties of an RGP lens based on power changes by a plasma torch at a low temperature and under atmospheric pressure.
Methods: A lens bar with a diameter of 13 mm and length of 300 mm was cut flatly to a thickness of 3 mm and polished by a grinder. Subsequently, a plasma treatment was performed by changing the power to 200, 250, 300, 350, and 400 W, using an atmospheric plasma power source, which was injected with air. The contact angle and transmittance of the RGP lens were measured, and XPS was used to observe the change of the RGP lens surface composition.
Results: When the plasma was treated at 200 W, the contact angle was reduced to 31.3° as compared to the case without the plasma treatment. It was seen that the contact angle decreased slightly as the power increased from 250 to 400 W, by steps of 50 W, which was due to an increase of the hydrophilic O-C=O from the XPS analysis. The average transmittance of the plasma treatment at 200 W was not significantly different from that without the plasma treatment, but it decreased gradually as the power increased beyond 250 W.
Conclusions: As the power applied to the plasma increased, the contact angle on the surface of the RPG lens became smaller, and the transmittance of the lens decreased slightly. The decrease in the contact angle was due to an increase of hydrophilic molecules on the surface of the RGP lens.
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KEYWORD
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RGP lens, Plasma treatment, Wetting angle, Transmittance
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