Self-organization of a fan-shaped dendrimer at the air-water interface

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The orientation of hexagonal cylinders self-assembled from fan-shaped dendrimers is strongly affected by surface anchoring. Planar ordering of the cylinders is obtained on a water surface, while the cylinder assemblies align homeotropically on carbon substrates. To understand self-assembling mechanism of the planar ordering, we investigate the surface texture of Langmuir-Blodgett monolayers and multilayers of an asymmetric fan-shaped second generation dendrimer containing a CO2C3H7 core group of the cylinder and dodecyl (C12H25) alkyl tails at the air-water interface. Surface pressure-area (pi-A) isotherm and Brewster angle microscopy (BAM) measurements show that the molecule forms a stable monolayer on a water surface with two phase transitions (gaseous phase --> expanded phase --> condensed phase). The electron diffraction (ED) patterns, transmission electron microscopy (TEM) images, and atomic force microscopy (AFM) images of the condensed monolayers clearly reveal that the molecule forms edge-on-oriented monolayers with hexagonal packing on the water surface, suggesting fractional cylindrical configuration at the air-water interface. Upon further compression, the condensed monolayer is transformed into a multilayer, and the interfacial structure becomes planar morphology. These results demonstrate the origin of planar alignment of self-assembled dendrimers on water surface.
Publisher
AMER CHEMICAL SOC
Issue Date
2003-02
Language
English
Article Type
Article
Keywords

LANGMUIR-BLODGETT-FILMS; SPHERICAL SUPRAMOLECULAR DENDRIMERS; AIR/WATER INTERFACE; MONOLAYERS

Citation

LANGMUIR, v.19, no.4, pp.1154 - 1158

ISSN
0743-7463
URI
http://hdl.handle.net/10203/82056
Appears in Collection
NT-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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