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Near‐field scanning optical microscopy studies of l ‐α‐dipalmitoylphosphatidylcholine monolayers at the air–liquid interface
Author(s) -
Shiku H.,
Dunn R. C.
Publication year - 1999
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1999.00525.x
Subject(s) - dipalmitoylphosphatidylcholine , near field scanning optical microscope , monolayer , optical microscope , microscopy , analytical chemistry (journal) , materials science , langmuir , chemistry , optics , nanotechnology , scanning electron microscope , membrane , aqueous solution , chromatography , physics , composite material , biochemistry , phospholipid , phosphatidylcholine
The phase structure in l ‐α‐dipalmitoylphosphatidylcholine–2.0 mol% fluorescent 1,1′‐dioctadecyl‐3,3,3′,3′‐tetramethylindocarbocyanine perchlorate Langmuir monolayers dispersed on a 2 m sucrose solution subphase is studied with near‐field scanning optical microscopy (NSOM). Cantilevered NSOM probes operating in a tapping‐mode feedback or an optical interferometric feedback mode are capable of tracking the air–sucrose solution interface. At the micrometre scale, the NSOM fluorescence images reveal lipid domain features similar to those observed previously in supported Langmuir–Blodgett (LB) monolayers. At the submicrometre scale, the small nanometric lipid islands seen in LB films are not observed at the air–sucrose interface. This supports a mechanism in which domain formation in LB films can be induced by means of the transfer process onto the solid support. Progress towards extending these studies to films at the air–water interface using the optical interferometric feedback method is also discussed.