STUDY OF THE CONDITIONS OF DETACHMENT OF VESICLES FROM CAPILLARY OR ATTEMPT AT MEASURING LOW INTERFACIAL-TENSIONS BY THE DROP VOLUME (WEIGHT) METHOD USING THE HARKINS-BROWN CORRECTIONS

The conditions of the detachment of vesicles from the capillary are de termined depending on the interfacial tension, the difference in the d ensities of internal and external aqueous phases, and the capillary ra dius. The comparison of the height and volume of vesicles at the time of detachment and corresponding values for the droplets indicates thei r geometric similarity, thus making it possible to employ the Harkins- Brown approach to the quantitative description of the vesicle detachme nt. Using vesicles, interfacial tensions were measured in the range of 4-4 x 10(-2) mN/m at the density differences varying from 10(2) to 2 kg/m(3). The values obtained were compared with the corresponding data on interfacial tension measured by the methods of drop volume (weight ) and spinning drop. Possible reasons for the discrepancies in the exp erimental data, particularly significant in the range of low interfaci al tensions, were considered.