황철석의 표면 거칠기와 접촉각의 관계
Relationship between Surface Roughness and Contact Angle of Pyrite
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초록
황철석 시편은 그의 표면 거칠기에 상관없이 측정시간이 30초 경과함에 따라 접촉각이 약 5°차이가 발생하였다. 따라서 sessile drop법으로 접촉각을 측정할 경우에는 접촉시간에 따른 오차를 배제하기 위해서 측정시간을 고정하는 것이 중요하다. 광물학적으로 균질한 황철석 시료를 취하여 평탄하게 제조한 시편인데도 불구하고 측정위치에 따라 접촉각에 많은 차이를 보이고 있었다. 이는 주로 광물 표면의 거칠기 때문에 나타나는 현상으로 황철석의 접촉각은 표면 거칠기가 증가함에 따라 약간 감소하였다. 이는 Wenzel이론에 따라 친수성 표면에서 나타나는 전형적인 현상이다. 따라서 황철석의 소수화도를 증가시키려면 그의 표면 거칠기를 낮추는 것이 필요하다.
Abstract
There is approximately 5˚ difference in contact angle on the pyrite surface before and after 30 second interval measurement independent of roughness. Thus it is important to fix the measurement time to exclude the errors made from the contact time when contact angles are measured by sessile drop method. Though the samples, which were taken from the mineralogically homogeneous pyrite samples are evenly made, there are lots of differences in the contact angles according to the measurement positions. That was mostly due to the surface roughness of minerals. The contact angles of pyrite samples decreased slightly as the surface roughness increased. It is a typical phenomenon that it appears in hydrophilic surfaces depending on the Wenzel theory. Therefore it is necessary to lower the surface roughness to increase hydrophobicity of pyrite.
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