Effect of surfactant adsorption time on the observation of Newton black film in foam film |
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| Authors: | Kashchiev Dimo Exerowa Dotchi |
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| Institution: | aInstitute of Physical Chemistry, Bulgarian Academy of Sciences, ul. Acad. G. Bonchev 11, Sofia 1113, Bulgaria |
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| Abstract: | Observation of Newton black film (NBF) in foam film is possible only with a certain probability W which depends on the concentration C of surfactant in the solution and on the time ta during which adsorption of surfactant at the solution/air interface has taken place. In the paper, the W(C,ta) dependence is derived and used to analyze the effect of ta on the critical surfactant concentration Cc below which NBF in foam film practically cannot be observed. An expression for the Cc(ta) function is obtained which reveals that Cc decreases substantially with increasing ta. This expression is found to describe well experimental Cc(ta) data for foam films obtained from aqueous solution of the therapeutic surfactant INFASURF. |
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| Keywords: | Surfactant adsorption Newton black film Film lifetime Hole nucleation Critical surfactant concentration INFASURF |
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