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Science 17 October 1997:
Vol. 278. no. 5337, pp. 449 - 452
DOI: 10.1126/science.278.5337.449
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Reports

Direct Visualization of Individual Cylindrical and Spherical Supramolecular Dendrimers

S. D. Hudson, * H.-T. Jung, V. Percec, * W.-D. Cho, G. Johansson, G. Ungar, * V. S. K. Balagurusamy

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.

S. D. Hudson, H.-T. Jung, V. Percec, W.-D. Cho, G. Johansson, The W. M. Keck Laboratories for Organic Synthesis, Department of Macromolecular Science, Case Western Reserve University, Cleveland, OH 44106-7202, USA.
G. Ungar and V. S. K. Balagurusamy, Department of Engineering Materials and Centre for Molecular Materials, The University of Sheffield, Sheffield S1 3JD, UK.
*   To whom correspondence should be addressed.

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