Morphological structures in monolayers of long chain alcohols
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.
Key words
Fatty alcohols monolayer Brewster angle microscopy isotherm phase behaviorPreview
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References
- 1.Harkins WD (1952) Physical Chemistry of Surface Films, Reinhold, New YorkGoogle Scholar
- 2.Gaines GL (1966) Insoluble Monolayers at Liquid-Gas Interfaces, Interscience, New YorkGoogle Scholar
- 3.Henon S, Meunier J (1991) Rev Sci Instrum 62:936–939CrossRefGoogle Scholar
- 4.Hönig D, Overbeck GA, Möbius D (1992) Adv Mater 4:419–424CrossRefGoogle Scholar
- 5.Hönig D, Möbius D (1991) J Phys Chem 95:4590–4592CrossRefGoogle Scholar
- 6.Vollhardt D, Gehlert U, Siegel S (1993) Colloids Surfaces A 76:187–195CrossRefGoogle Scholar
- 7.Möhwald H (1990) Annu Rev Phys Chem 41:441–476CrossRefGoogle Scholar
- 8.Qui X, Ruiz-Garcia J, Stine KJ, Knobler CM, Selinger JV (1991) Phys Rev Lett:703–706Google Scholar
- 9.Gehlert U, Siegel S, Vollhardt D (1993) Progr Colloid Polymer Sci 93:247CrossRefGoogle Scholar
- 10.Moore B, Knobler CM, Broseta D, Rondelez F (1986) J Chem Soc, Faraday Trans 2 82:1753–1761Google Scholar
- 11.Stine KJ, Rauseo SA, Moore BG, Wise JA, Knobler CM (1990) Phys Rev A 41:6884–6892CrossRefGoogle Scholar
- 12.Berge B, Simon AJ, Libchaber A (1990) Phys Rev A 41:6893–6900CrossRefGoogle Scholar
- 13.Hönig D, Möbius D (1992) Thin Solid Films 210/211:64–68CrossRefGoogle Scholar
- 14.Overbeck GA, Hönig D, Möbius D (1993) Langmuir 9:555–560CrossRefGoogle Scholar