Method and apparatus for measuring a receding contact angle

Abstract

A method for measuring a receding contact angle between a sample surface and a drop of a liquid is provided. The method includes ejecting a dosing volume of the liquid from an opening onto the sample surface such that the liquid is ejected as a continuous jet at a defined flow rate for a defined dosing time period, and the opening comprises an opening diameter. The dosing volume of the liquid is allowed to form a drop on the sample surface. At least one geometrical parameter of the drop formed on the sample surface is measured and a contact angle between the sample surface and the drop is determined based on the at least one geometrical parameter. The flow rate and the dosing time period are selected such that the dosing volume does not exceed the flow rate multiplied by 0.11 s.

Dependencies are inferred from the claim text.