Fluorescence Microscopy Imaging of Giant Folding in a Catanionic Monolayer

The behavior of the catanionic system of dioctadecyldimethylammonium bromide (DODAB) and sodium dodecyl sulfate (SDS) was investigated at 23 ± 1°C at the air−water interface using a Langmuir trough. The surface pressure as a function of surface area was measured while monitoring domain structures us...

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Bibliographic Details
Published in:Langmuir 2009-05, Vol.25 (9), p.5006-5011
Main Authors: Coppock, Joseph D, Krishan, Kapilanjan, Dennin, Michael, Moore, Brian G
Format: Article
Language:English
Subjects:
Cations - chemistry
Chemistry
Colloidal state and disperse state
Exact sciences and technology
Fluorescent Dyes - chemistry
General and physical chemistry
Interfaces: Adsorption, Reactions, Films, Forces
Microscopy, Fluorescence
Molecular Structure
Surface physical chemistry
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Summary:The behavior of the catanionic system of dioctadecyldimethylammonium bromide (DODAB) and sodium dodecyl sulfate (SDS) was investigated at 23 ± 1°C at the air−water interface using a Langmuir trough. The surface pressure as a function of surface area was measured while monitoring domain structures using epifluorescence microscopy. At high surface densities, the monolayer exhibits collapse through reversible folding at about 47 mN m−1. This corresponds to the DODAB collapse surface pressure. The number of folds increases with the rate of compression speed and is history-dependent.
ISSN:0743-7463
1520-5827
DOI:10.1021/la803773y