Phase transitions in Langmuir monolayers of polar molecules

David Andelman*, Françoise Broçhard, Jean François Joanny

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Insoluble Langmuir monolayers are investigated in the presence of dipolar forces which can have two origins: permanent dipoles in neutral monolayers and induced dipoles in charged monolayers. The main effect of the additional long-range repulsive interactions is to stabilize undulating phases at thermodynamic equilibrium. Phase diagrams are obtained in two limits: close to the liquid-gas critical point via a Ginzburg-Landau expansion of the free energy (mainly within a mean-field approximation), and at low temperatures by free energy minimization. Possible applications of this theory to experiments at the liquid-gas, liquid expanded-liquid condensed, and solid-liquid transitions are discussed.

Original languageEnglish
Pages (from-to)3673-3681
Number of pages9
JournalThe Journal of Chemical Physics
Issue number6
StatePublished - 1987
Externally publishedYes


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