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The force of interaction in a monomolecular film at low surface pressure

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Summary

The London-van der Waals attractive constant between methylene groups is experimentally determined from measurements of the constant and small surface pressure of a monomolecular film, assuming the formation of two dimensional micelles. Electrostatic repulsion is eliminated by subtracting the surface pressures for two surface active materials having the same polar groups but hydrocarbon chains of different lengths. Experimental values of the London-van der Waals attractive constant assuming a solid film are about 5 × 10−59 erg cm6 which agrees well with the theoretical value.

Zusammenfassung

Die London-van der Waals-Anziehungskonstante zwischen Methylengruppen wird experimentell über Messungen des konstanten Oberflächendruckes eines monomolekularen Films bestimmt, wobei man die Bildung von zweidimensionalen Micellen annimmt. Die elektrostatische Abstoßung wird eliminiert, indem man die Oberflächendrucke von zwei grenzflächenaktiven Substanzen, welche sich nur durch die verschieden langen Kohlenstoffketten unterscheiden, voneinander subtrahiert. Experimentelle Werte der London-van der Waals-Anziehungskonstanten ergeben bei der Annahme eines festen Films ungefähr 5 × 10−59 erg cm6, in guter Übereinstimmung mit theoretischen Werten.

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Matsumoto, M., Montandon, C. & Hartland, S. The force of interaction in a monomolecular film at low surface pressure. Colloid & Polymer Sci 255, 261–268 (1977). https://doi.org/10.1007/BF01381285

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  • DOI: https://doi.org/10.1007/BF01381285

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