Bernd 



make the solutions. The results are given in Table 9. 

 strength means less retardation of dissolving. 



Increasing tensile 



Materials 1 through 7 were "good" film-formers. The data for hydrocar- 

 bons is plotted in Fig. 13 against the number of carbon atoms in the molecule in 

 order to show the effects of the length of the molecule. From the shape of the 

 curve, one can conclude that solubility and/or transport to a nucleus controls 

 and limits the behavior obtainable from a surface film. An optimum molecular 

 weight for the least dissolving exists. 



Table 9 



Effect of Monomolecular Films on Nuclei Dissolving 



(Tensile Strength 30 Minutes After Cavitation) 



The most effective films in retarding dissolving were lauric acid and a 

 gelatin (Fisher G-7). Egg albumin fell within the range blanketed by the hydro- 

 carbons, showing that its essential properties relating to nuclei are similar to 

 hydrocarbons. 



102 



