几种常见矿物的接触角测定及其讨论

为了评价矿物表面与特征液体的界面能量，分别测定了长石、石英、黑云母、方解石、萤石和黄铁矿等7种常见矿物与水、正庚烷和正丁醇的接触角，并计算了相应的表面自由能。结果表明同一矿物不同结晶面(晶面)的接触角有一定的差异，这一差异与矿物结构面上原子种类和相对含量差异有一定的对应关系。

Measurement of contact angles of several common minerals and its discussion

In this paper, the contact angles between common minerals and water, n_heptane and n_butanol are reported. Seven common minerals, i.e., quartz, biotite, fluorite, pyrite, calcite, microcline and perthite, were polished and measured, and the surface free energies were calculated based on the Young's Equation. The results indicate that most of the crystalline planes are partially wetted by water and fully wetted by n_heptane and n_butanol. Furthermore, the heterogeneity between different crystalline planes is found, which could be attributed to the distinctive density of atoms of different elements as shown from the crystalline lattices. The data obtained and the viewpoint held in this paper will be helpful to understanding the interface process between the mineral and the liquid phase.