Measurement of viscosity of liquids in quartz capillaries

A method is developed for measuring radii of microcapillaries and the viscosity of liquids in them. The viscosity of water, benzene, and carbon tetrachloride was measured in quartz capillaries of radius r= 0.5–0.04 µm. The viscosity of water in such capillaries is elevated (by 40 % in capillaries 0.04 µm radius), but the viscosity of non-polar CCl4 and benzene remains normal. The temperature dependence of the increased viscosity of water is studied; the viscosity becomes normal at t= 60–70°C When water is drawn into a capillary with “dry” walls, the wetting angle differs from zero. In these cases the contact angle is not constant, but depends on the rate of entry of the water.