Abstract
The capillary rise of aqueous solutions of three surfactants in a strip of vertical filter paper has been measured. There was a quadratic relationship between the height of rise and time as expected from theory. In all cases the surfactants decreased the penetration of water into filter paper, the rate constant for penetration being roughly proportional to the ratio of the surface tension and the viscosity of the solutions. The simple quadratic relationship between height of rise and time was not obtained with solutions of polystyrene in toluene. These solutions behaved as though the viscosity was increasing with increase in capillary rise. Data from a capillary rise experiment have been used to determine the relationship between the viscosity of a polymer solution and the shear rate.
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