Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 26, Issue 6, Pages 456-460Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.200400602
Keywords
atomic force microscopy (AFM); conformational transitions; real-time imaging; single macromolecules; surfaces
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We applied scanning force microscopy to study, in real time, the mobility and reorganisation of single poly(2-vinylpyridine) molecules that were adsorbed on mica and exposed to vapours of ethanol or water. The macromolecules adopted a compact globular conformation in ethanol-saturated vapour and extended to a surface-bound two-dimensional coil in water-saturated vapour. Hence, reversible coil-to-globule conformational transitions of flexible polymer chains were directly visualized with unique molecular resolution.
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