Fluorescence microscopy imaging of giant folding in a catanionic monolayer
Joseph D Coppock1, Kapilanjan Krishan, Michael Dennin
1Department of Chemistry, Augustana College, Sioux Falls, South Dakota 57197, USA.
Abstract:
The behavior of the catanionic system of dioctadecyldimethylammonium bromide (DODAB) and sodium dodecyl sulfate (SDS) was investigated at 23 +/- 1 degrees 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.
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