Bubble tensiometers are used in research, development and quality control for characterization of water-based solutions such as surfactants, polymers, acids and bases. They measure:
- dynamic surface tension
- bubble lifetime
- bubble deadtime
- hydrostatic pressure
- effective adsorption time
With patented cutting edge technology, the Bubble Tensiometer BPA-800P is developed from the maximum bubble pressure technique to provide quick and reliable dynamic surface tension, hydrostatic pressure, effective adsorption time, bubble lifetime and deadtime measurements. This information is useful to study, control and develop surfactants, ink jet printing, coating technologies, foam and emulsions, detergents, pharmaceuticals, cosmetics, food technologies and environmental monitoring to name but a few.
Measurement principle: A capillary is immersed into the liquid sample and air is bubbled out of the capillary. The pressure inside the capillary is measured. As the pressure increases in the capillary, a bubble is gradually pushed into the liquid. Maximum pressure is reached when the drop is hemispherical, after which the bubble quickly grows and leaves the capillary. The maximum pressure depends on the force exerted by the liquid, and hence its surface tension. The Bubble Tensiometer BPA-800P also monitors bubble lifetime and deadtime, allowing more detailed investigation of liquid properties.