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A simple method for the study of variation of boundary tension with time

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Summary

1. A new method for the determination of variation of interfacial and surface tensions with time, has been described. In this method, the advantages of the pendant drop method are combined with those of the drop weight method, thus simplifying the experimental technique.

2. Variation of interfacial and surface tenssions with time has been investigated for congorubin solutions. The rubin solution yields at the air-liquid interface a solid film and at the solution-benzene interface a gaseous type of film.

3. The effect of concentration of rubin on the variation of interfacial tension with time has been studied. At concentrations of rubin higher than 0·005% the fall in the interfacial tension will be large.

4. Salts like sodium chloride and potassium iodide lower considerably the interfacial tension between rubin solution and benzene. Lowering of pH also brings about a fall in interfacial tension.

5. The slow variation of interfacial tension has been accounted for, on the basis of changes in zeta-potential.

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References

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Authors
  1. R. S. Subrahmanya
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  2. M. R. A. Rao
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  3. B. Sanjiva Rao F.A.Sc.
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Additional information

Part of the Thesis submitted by R. S. Subrahmanya for the M.Sc. Degree of the Mysore University.

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Subrahmanya, R.S., Rao, M.R.A. & Rao, B.S. A simple method for the study of variation of boundary tension with time. Proc. Indian Acad. Sci. (Math. Sci.) 35, 136 (1952). https://doi.org/10.1007/BF03172230

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  • DOI: https://doi.org/10.1007/BF03172230

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