Motivated by the atomic force microscopy, the similar measurements are used to depict the adhesion property of solid substrate towards the specific liquid. In addition to wettability of the newly engineered liquid repellent substrates, the quantification of the adhesion force has also become paramount to comment on the appropriate application of the substrate. A significant literature focuses on the adhesion force measurements between the liquid and solid substrate in an air medium but similar justice is not given to the substrate developed for under-liquid applications. This work presents a detailed procedure outlining the accurate measurement of adhesion force of solid substrate immersed in fluid, in either air or liquid. The adhesion force is a manifestation of wettability of the substrate and interfacial tension of liquid-drop. However, due to difference in drop volume and drop deposition technique, the base diameter varies even the liquid-solid combination remains unaltered. As a result of varied base diameter, there are changes in adhesion force magnitude for the same liquid-solid interface. To demonstrate this, we have purposefully varied the operating parameters that resulted in different base diameter for the same drop-solid combination. Despite significant difference in the snapping force magnitude due to varied base diameters, we identified the correct way to measure the adhesion force, which is independent of the above-mentioned factors. The proven hypothesis is being validated for liquid medium where the role of buoyancy also plays an additional role. Apart from surrounding medium effect on adhesion force, we also plan to study the role of fixed base diameter.

Adhesion force measurements for under liquid substrates

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