저에너지 고출력 이온빔을 이용한 polyvinylidene fluoride 표면의 초친수성화

Abstract

Polyvinylidene fluoride (PVDF) surface was irradiated and became superhydrophilic by low energy (180 eV) and high flux (~1015/cm2/s) ion beam. As an ion source, a closed electron Hall drift thruster of =70 mm outer channel size without grid was adopted. Ar, O2 and N2O were used for source gases. When N2O+ and O 2+ reactive gas ion beam were irradiated with the ion fluence of 5x1015/cm2, the wetting angle for deionized water was drastically dropped from 61 to 4 and 2, respectively. Surface energy was also increased up to from 44 mN/m to 81 mN/m. Change of chemical component in PVDF surface was analyzed by x-ray photoelectron spectroscopy. Such a great increase of the surface energy was intimately related with the increase of hydrophilic group component in reactive ion irradiated PVDF surfaces. By using an atomic force microscopy, the root-mean-square of surface roughness of ion irradiated PVDF was not much altered compared to that of pristine PVDF.