Anisotropic surface broken bond properties and wettability of calcite and fluorite crystals

方解石和萤石晶体表面断裂键性质和润湿性的各向异性(英文)

Anisotropic surface broken bond densities of six different surfaces of calcite and three surfaces of fluorite were calculated. In terms of the calculated results, the commonly exposed surfaces of the two minerals were predicted and the relations between surface broken bonds densities and surface energies were analyzed. Then the anisotropic wettability of the commonly exposed surfaces was studied by means of contact angle measurement. The calculation results show that the （101^-4）, （213^-4）and （01 1^-8）surfaces for calcite and （111） for fluorite are the most commonly exposed surfaces and there is a good rectilinear relation between surface broken bond density and surface energy with correlation of determination （R^2） of 0.9613 and 0.9969, respectively. The anisotropic wettability of different surfaces after immersing in distilled water and sodium oleate solutions at different concentrations can be explained by anisotropic surface broken bond densities and active Ca sites densities, respectively.

计算方解石6个晶面和萤石3个晶面的表面断裂键密度,借助各向异性的表面断裂键密度预测两种含钙矿物的常见暴露面,分析表面断裂键密度与表面能之间的关系,利用接触角实验研究两种矿物常见暴露面的润湿性。表面断裂键密度计算分析表明,(1014)、(2134)和(0118)面及(111)面分别是方解石和萤石最常见的暴露面;两种矿物表面断裂键密度与表面能之间存在线性关系,其相关系数R2分别为0.9613和0.9969。接触角测量实验表明,两种矿物常见暴露面和水作用后的润湿性与表面断裂键密度有关,表面断裂键密度越大,亲水性越强,接触角越小;和油酸钠作用后的润湿性与表面Ca活性质点密度及质点的空间分布有关。