Hypothesis

Under axisymmetric conditions, changes in the thickness of the thin film between a fluid drop and a solid revealed by white light interferometry can provide information about the interaction of the bodies. Thus, in principle one can quantify the force between the surfaces using interferometric information of film thickness profile. This is needed to quantify and analyze drop-solid interactions across complex fluids such as an ionic liquid to independently characterize new surface forces.

Experiments

Interferometric fringes were obtained in experiments on the interaction between a mercury drop and mica across a film of room temperature ionic liquid. The data is analyzed using a novel formula giving the total force acting on the drop. The calculations are compared with two other approaches to estimating forces. Qualitative and quantitative differences are discussed.

Findings

This is the first report of forces measured between mercury and mica across an ionic liquid. The system is subjected to different applied electric potentials. In each case a long ranged, exponentially decaying repulsive force is found. At small separations, the system becomes unstable and the surfaces jump into contact. The comparison of force calculation methods demonstrates the superiority of the force approach proposed here.

中文翻译：

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使用白光干涉仪定量分析离子液体中汞和云母之间的力

假设

在轴对称条件下，白光干涉法揭示的液滴与固体之间的薄膜厚度变化可以提供有关物体相互作用的信息。因此，原则上可以使用膜厚分布的干涉信息来量化表面之间的力。这需要量化和分析跨复杂流体（如离子液体）的滴固相互作用，以独立表征新的表面力。

实验

在关于室温离子液体薄膜上汞滴和云母之间相互作用的实验中，获得了干涉条纹。使用新颖的公式分析数据，得出作用在液滴上的总力。将计算结果与其他两种估算力的方法进行比较。讨论了质量和数量上的差异。

发现

这是汞和云母之间通过离子液体测得的力的第一份报告。该系统承受不同的施加电势。在每种情况下，都会发现远距离的，呈指数衰减的排斥力。如果间隔很小，系统将变得不稳定，并且表面会突然接触。力计算方法的比较证明了这里提出的力方法的优越性。