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Direct Visualization of Individual Cylindrical and Spherical Supramolecular Dendrimers

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Science  17 Oct 1997:
Vol. 278, Issue 5337, pp. 449-452
DOI: 10.1126/science.278.5337.449

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Abstract

Electron microscopy methods have been used to visualize individual spherical and cylindrical supramolecular dendrimers, providing definitive confirmation of the structures suggested by previous x-ray diffraction analysis that assumed a microsegregated model. These dendrimers are self-assembled, self-organized, and aligned spontaneously and simultaneously in hexagonal columnar or cubic thermotropic liquid-crystal phases with high uniformity. Homeotropic and planar ordering of the hexagonal columnar liquid crystal was precisely controlled by a variety of surfaces. The stiffness of these cylinders was evaluated by examining their planar texture and its defects.

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