Abstract
The morphological structure of monolayers of straight-chain alcohols with 14 to 18 C-atoms are studied. Compression/decompression isotherms are illustrated by images taken with a Brewster angle microscope. Tetradecanol with a plateau region in the surface pressure-area isotherm exhibits circular domains during the phase transition. Decompression leads to the formation of a stable two-dimensional foam in the plateau region in the isotherm, if the monolayer was compressed to a surface pressure of about 10 mN/m above the kink. The corresponding point in the isotherm is marked by a weak kink. If the expansion starts at lower pressures, the original domain structure can be attained, and the compression/decompression cycle is reversible. Longer alkyl chains or lower temperatures do not drastically change this behavior.
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