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利用表面力仪(SFA)测量一价与二价电解质溶液中分子级光滑的云母表面间作用力.研究了钾离子、钠离子、镁离子在分子级光滑表面云母间的性质.实验中测量了DLVO作用力及水合力,结果表明:在较低浓度的一价离子溶液(约10-4mol/L)中,实验中所测得的力与DVLO理论力曲线完全一致.然而在浓度超过反离子临界浓度时,额外的短程斥力偏离DLVO理论值,临界浓度对于每一种离子是不同的.实验结果展现了这3种离子对云母表面的屏蔽效应差异及在溶液中的水合性质.此外,从这些结果可以评估2个水合钠离子或者2个水合钾离子之间的作用能.
Surface force meter (SFA) was used to measure the interaction between the molecularly smooth mica surfaces in monovalent and divalent electrolyte solutions. The properties of potassium ions, sodium ions and magnesium ions on the molecularly smooth surface mica were investigated. DLVO force and hydration force.The results show that the force measured in the experiment is consistent with the theoretical force curve of DVLO in the lower concentration of monovalent ionic solution (about 10-4mol / L) At the critical concentration, the additional short-range repulsion deviates from the DLVO theoretical value, and the critical concentration is different for each ion.The experimental results show the difference of the shielding effect between these three ions on the mica surface and the hydration in the solution.Furthermore, These results can assess the action energy between two hydrated sodium ions or two hydrated potassium ions.