Osmotic pressure of electrostatically stabilized magnetic liquids

Osmotic pressure measurements are performed, either using a membrane-osmome ter, or by the method of osmotic stress, in order to determine the equation of state of acidic and pH 7 magnetic liquids. Both systems are stabilized by electrostatic repulsions and the magnitude of interactions is estimated through the value of the second-virial coefficient. The effect of the ionic strength and of particle size is investigated. It appears that, even for h igh ionic strength, repulsions dominate the sum of interactions. (C) 1999 E lsevier Science B.V. All rights reserved.