Fa Keqing, Nguyen Anh V, Miller Jan D
Department of Metallurgical Engineering, University of Utah, 135 South 1460 East, Salt Lake City, Utah 84112, USA.
J Phys Chem B. 2005 Jul 14;109(27):13112-8. doi: 10.1021/jp0445526.
Spherical calcium dioleate particles ( approximately 10 mum in diameter) were used as AFM (atomic force microscope) probes to measure interaction forces of the collector colloid with calcite and fluorite surfaces. The attractive AFM force between the calcium dioleate sphere and the fluorite surface is strong and has a longer range than the DLVO (Derjaguin-Landau-Verwey-Overbeek) prediction. The AFM force between the calcium dioleate sphere and the mineral surfaces does not agree with the DLVO prediction. Consideration of non-DLVO forces, including the attractive hydrophobic force and the repulsive hydration force, was necessary to explain the experimental results. The non-DLVO interactions considered were justified by the different interfacial water structures at calcite- and fluorite-water interfaces as revealed by the numerical computation experiments with molecular dynamics simulation.
球形油酸钙颗粒（直径约10微米）被用作原子力显微镜（AFM）探针，以测量捕收剂胶体与方解石和萤石表面之间的相互作用力。油酸钙球体与萤石表面之间的吸引性原子力显微镜力很强，且作用范围比德亚金-朗道-维韦-奥弗比克（DLVO）理论预测的更长。油酸钙球体与矿物表面之间的原子力显微镜力与DLVO理论预测不一致。为了解释实验结果，必须考虑非DLVO力，包括吸引性疏水力和排斥性水化力。通过分子动力学模拟的数值计算实验揭示，方解石-水界面和萤石-水界面处不同的界面水结构证明了所考虑的非DLVO相互作用是合理的。
