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Science 10 September 2004:
Vol. 305. no. 5690, pp. 1598 - 1601
DOI: 10.1126/science.1100872
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Reports

Mesophase Structure-Mechanical and Ionic Transport Correlations in Extended Amphiphilic Dendrons

B.-K. Cho,1* A. Jain,1* S. M. Gruner,2 U. Wiesner1{dagger}

We have studied the self-assembly of amphiphilic dendrons extended with linear polyethylene oxide (PEO) chains and their ion complexes. Keeping the dendron core and linear PEO chain compatible allows for the combination of dendritic core-shell and conventional blockcopolymer characteristics for complex mesophase behavior. An unexpected sequence of crystalline lamellar, cubic micellar (Formula), hexagonal columnar, continuous cubic (Formula), and lamellar mesophases is observed. Multiple phase behavior within single compounds allows for the study of charge transport and mechanical property correlations as a function of structure. The results suggest an advanced molecular design concept for the next generation of nanostructured materials in applications involving charge transport.

1 Department of Materials Science and Engineering and Cornell University, Ithaca NY 14853.
2 Department of Physics, Cornell University, Ithaca NY 14853.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: ubw1{at}cornell.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)