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 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.
Coppock
Joseph D
JD
Department of Chemistry, Augustana College, Sioux Falls, South Dakota 57197, USA.
Krishan
Kapilanjan
K
Dennin
Michael
M
Moore
Brian G
BG
D002412:Cations / Q000737:chemistry; D005456:Fluorescent Dyes / Q000737:chemistry*; D008856:Microscopy, Fluorescence; D015394:Molecular Structure
D002412:Cations; D005456:Fluorescent Dyes