목적: 공기 중에서 플라즈마 처리가 된 상용 불화규소 아크릴레이트 RGP 콘택트렌즈(Boston XO)의 분위기와 유지 시간에 따른 표면 성분 및 습윤성의 변화를 연구하였다. 방 법: 렌즈는 진공, 공기, 물 등의 분위기로 보관했으며, X-선광전자분광분석기(XPS)로 성분과 화학결합을, 접촉각으로 습윤성의 변화를 측정하여 평가하였다. 결과: RGP 콘택트렌즈에 플라즈마 처리를 하면 렌즈 표면에 친수성기(C-O, O-C=O, Si-O)의 증가로 물에 대한 접촉각이 감소하여 표면의 습윤성이 증진되었으나, 모든 분위기에서 시간이 경과함에 따라 친수 성기가 감소하면서 접촉각이 증가하였다. 물 분위기에서는 렌즈 표면에 탄소 및 실리콘과 결합한 산소가 급격히 감소하면서 접촉각이 다시 증가하였다. 결론: 플라즈마 처리된 RGP 콘택트렌즈의 표면이 수분과 접촉하면, 산소가 급격히 감소하고 습윤성이 저하된다.

Purpose: Commercial RGP contact lenses(Boston XO), composed of fluorosilicone acrylate, were treated by using a plasma in air. The chemical compositions and wettability of the surfaces were studied as a function of the atmosphere and the holding time. Methods: The lenses were kept in the atmosphere of a vacuum, air, water, etc. The chemical compositions and bond contents were estimated by the examination of X-ray photoelectron spectroscopy (XPS) spectra. The changes of wettability were analyzed from wetting angle measurement. Results: The oxygen-containing hydrophilic radicals (C-O, O-C=O and Si-O) on the surface increased greatly when the contact lens was treated by the plasma. The wetting angles decreased and then the surface wettability was improved. However according to increase the holding time, those hydrophilic radicals decreased, and the wetting angles increased. In the water atmosphere, the oxygen bonded with the carbon or silicon decreased significantly, and the wetting angles increased again. Conclusions: When the RGP lens treated by the plasma was contacted with moisture, the oxygen on the surface decreased rapidly and the surface wettability was reduced.

• 신형섭(가야대학교 안경광학과) | Hyung-Sup Shin
• 장준규(가야대학교 안경광학과) | Jun-Kyu Jang