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Interfacial properties of surfaction

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Trends in Colloid and Interface Science VII

Part of the book series: Progress in Colloid & Polymer Science ((PROGCOLLOID,volume 93))

Abstract

Surfactin, a lipopeptide produced by Bacillus subtilis, is characterized by a lactone bond. — Interfacial properties of surfactin were studied at w/a interface: spreading isotherms at 17.5o and 20.5°C were recorded as a function of subphase composition (water at two different acid pH, mono and divalent ions solutions at the same pH and ionic strength). — The isotherms were affected by temperature and subphase composition, bo th in the shape and in the limiting area, although the films remain always in the liquid condepensed phase. — The monolayers were then transferred onto a solid substrate according to the Langmuir-Blodgett technique: the ellipsometric measurements confirm the planar disposition at the w/a interface and the FTIR spectra show the presence of the lactone ring also in the bidimensional state of molecule. — Furthermore, mixed monolayers of surfactin with methylstearate, which is very stable in bidimensional state, were studied at the w/a interface.

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Authors and Affiliations

  1. Department of Chemistry, University of Florence, Via G Capponi 9, 50121, Florence, Italy

    A. Gilardoni & G. Gabrielli

Authors
  1. A. Gilardoni
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  2. G. Gabrielli
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P. Laggner O. Glatter

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© 1993 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG

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Gilardoni, A., Gabrielli, G. (1993). Interfacial properties of surfaction. In: Laggner, P., Glatter, O. (eds) Trends in Colloid and Interface Science VII. Progress in Colloid & Polymer Science, vol 93. Steinkopff. https://doi.org/10.1007/BFb0118530

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  • DOI: https://doi.org/10.1007/BFb0118530

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  • Publisher Name: Steinkopff

  • Print ISBN: 978-3-7985-0955-9

  • Online ISBN: 978-3-7985-1676-2

  • eBook Packages: Springer Book Archive

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