Abstract
Kinetics of particle size growth in emulsions of 12 fluorocarbons was studied by means of photon correlation spectroscopy. It was shown that a mechanism of emulsion coarsening with time was the Ostwald ripening, solubility of fluorocarbons in water (on the level of 10-6- 10-11 ml/ml) being the key parameter for fluorocarbon emulsions stability. The solubilities of fluorocarbons in water were calculated from the Ostwald ripening kinetics data and the solubility-fluorocarbon structure relationship was established. In a homologous series of normal fluorocarbons the solubility in water decreased by a factor of 8.0 for each -CF2- group. For a given carbon number, ring formation and branching increased water solubility of fluorocarbons. A correlation between fluorocarbons solubility in water and solvent cavity area [1] was found allowing one to predict the fluorocarbon emulsion stability from the structure of fluorocarbon.
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