A method for measuring the surface tension of liquids and for the measurement of contact angles

摘要

A method for measuring the surface tension of a in a cylindrical container (10) liquid (1) according to a height-increase method, wherein– a cylindrical capillary (3) with ring-shaped cross section and being vertically in the container (10) is immersed, so that an inner capillary surface (4) of the liquid (1) with an inner wetting angle (8) and an outer capillary surface (6) of the liquid (1) with an outer wetting angle (9), and– an inner increase (5) as the height of the edge of the inner capillary surface (4) above the level (2) of the liquid (1) in the container (10) as well as an outer increase (7) as the height of the edge of the outer capillary surface (6) via the level (2) of the liquid (1) in the container (10) are measured and– from the interior increase (5) and the outer increase (7), the surface tension of the liquid (1) is determined under the assumption that the inner wetting angle (8) with the outer wetting angle (9) and the surface tension of the inner capillary surface (4) is equal to the surface tension of the of the inner capillary surface separate outer capillary surface (6) is.