Abstract
Pressure-area relations are derived for quasi-static compression of a Langmuir monolayer in the regimes of expanded and partially compressed chains. A monolayer is treated as an ensemble of flexible chains anchored at a flat water-air interface. Formation of surface pressure is attributed to excluded-volume interactions between segments of hydrophobic tail-groups. Close-form expressions are derived for the energy of interactions. Based on this relations, strength of excluded-volume interactions is evaluated by fitting pressure-area isotherms on stearic, behenic and pentacosadiynoic acids. It is found that the dimensionless strength of excluded-volume interactions is weakly affected by chain length and its value is close to frac(1, 3).
Original language | English |
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Pages (from-to) | 3374-3379 |
Number of pages | 6 |
Journal | European Polymer Journal |
Volume | 43 |
Issue number | 8 |
DOIs | |
State | Published - 1 Aug 2007 |
Keywords
- Excluded-volume interactions
- Flexible chains
- Langmuir monolayer
- Pressure-area isotherms
ASJC Scopus subject areas
- General Physics and Astronomy
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry