Crystallite structure formation at the collapse pressure of fatty acid Langmuir films

M. A. Valdes-Covarrubias, R. D. Cadena-Nava, E. Vásquez-Martínez, D. Valdez-Pérez, J. Ruiz-García*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

We report isotherm and atomic force microscopy studies of collapsed Langmuir monolayers of fatty acids. The Langmuir monolayers were overcompressed in the range 7-40°C and transferred onto mica after the sharp pressure drop when the collapse pressure was reached. Collapsed material was observed by AFM, which revealed that the multilayers are indeed three-dimensional crystallites. We found that the shape of the crystallites depends on the collapse temperature, the phase from which the collapse occurs and/or the chain length. However, at higher temperatures the collapsed films no longer show a well defined crystallite formation, but rather a more heterogeneous melt-like pattern. We associated the crystallite formation with known bulk crystal phases of the fatty acids.

Original languageEnglish
Pages (from-to)S2097-S2107
JournalJournal of Physics Condensed Matter
Volume16
Issue number22 SPEC. ISS.
DOIs
StatePublished - 9 Jun 2004

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